Gin Boomerang 4 User manual

Boomerang 4 Owners Manual
Thank you for taking your time to read this manual.

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Thank you…
Thank you for choosing the Boomerang 4. We are confident that this paraglider will provide you
with countless exciting experiences, long flights and exceptional competition results. This
manual contains all the information you need to fly and maintain your paraglider. A thorough
knowledgeofyourequipmentwillkeepyousafeandenableyoutomaximizeyourfullpotential.
Pleasepassonthismanualtothenewownerifyoudoresellyourglider.
HappyFlightsandSafeLandings,
TheGINTeam
Safety Notice
By the purchase of our equipment, you are responsible for being a certified
paraglider pilot and you accept all risks inherent with paragliding activities
including injury and death. Improper use or misuse of GIN equipment greatly
increases these risks. Neither Gin Gliders Inc nor the seller of GIN equipment
shall be held liable for personal or third party injuries or damages under any
circumstances.
Please note: This glider is a competition wing without DHV or ACPUL flight test
for certification, and should be flown by very experienced pilots only. To fly the
Boomerang 4 safely you must fly at least 100 hrs. per year and have several
years flying experience. If any aspect of the use of our equipment remains
unclear, please contact your local paragliding instructor, GIN reseller or the
importer in your country.

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Contents
Thankyou…........................................................................................................................................2
SafetyNotice.................................................................................................................................... 2
1.Gin Gliders...........................................................................................................................................4
2.Introducing the Boomerang 4 ...........................................................................................................5
ForPilots Who...................................................................................................................................5
Cutting-edgedesign …………………………………………………………………………………………………….5
Manufacturing …………………………………………………………………………………………………………….6
3.Beforeyou fly.......................................................................................................................................7
Pre-deliveryInspection ………………………………………………………………………………………………..7
SpeedSystem.....................................................................................................................................7
BreakLine Adjustment………………………………………………………………………………………………….8
Rucksack ............................................................................................................................................8
Yourharness ……………………………………………………………………………………………………………..9
Recommendedweight range…………………………………………………………………………….…………….9
Pre-flightsafety …………………………………………………………………………………………………………9
4.Flying the Boomerang 4 ...................................................................................................................10
Preparationforlaunch.....................................................................................................................10
Takeoff............................................................................................................................................11
Lineknots ortangles .......................................................................................................................11
Minsink /best glide.........................................................................................................................11
Accelerated flight.............................................................................................................................11
Activeflying.....................................................................................................................................12
Inturbulence....................................................................................................................................12
Losingaltitude.................................................................................................................................14
Steeringwithout brakes...................................................................................................................16
Aerobatics........................................................................................................................................16
Landingwith theBoomerang 4.........................................................................................................16
Towlaunch.......................................................................................................................................16
Motorizedflight...............................................................................................................................16
5.Care, maintenance andrepairs...........................................................................................................16
Groundhandling...............................................................................................................................17
UVdamage.......................................................................................................................................17
Packinginstructions ........................................................................................................................17
Transportand storage......................................................................................................................18
Cleaning...........................................................................................................................................18
Inspections......................................................................................................................................18
Repairs.............................................................................................................................................18
6.Technical Details.................................................................................................................................18
Testand certification.......................................................................................................................20
TechnicalSpecifications...................................................................................................................19
LinePlan ..........................................................................................................................................20
Description ………………………………………………………………………………………………………………22

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1. Gin Gliders
Gin Gliders was formed in 1998 by paraglider designer and competition pilot Gin Seok Song and
histeamofengineersandtestpilots.
Gin's philosophy is simple: to design gliders that he, and any other pilot, will love to fly. This
philosophy applies equally for a cross country intermediate like the Zoom, as for the world-
beating competition glider, the Boomerang. No glider is released to the market without Gin's
completesatisfaction.
Gin has over 15 years' experience of designing and manufacturing paragliders, and is backed by
an equally experienced team, both within the company in Korea and throughout a worldwide
network of distributors and dealers. The GIN Team has dominated the Paragliding World Cup
from 1998 to the present day and has had countless other competition successes in World Cups,
World and National Championships. This high level of expertise provided by dedicated
professionalsensuresthatyougetthebestpossibleproduct support and after sales service.

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2. Introducing the Boomerang 4
The Boomerang 4 is a completely new concept of high end competition wing. Designer Gin Seok
Song and Robert Graham have drawn on all their years of experience to produce a wing that is
uniquely in tune with the needs of today's competition pilots. The Boomerang 4 offers
exceptional performance combined with a precise handling and a sufficient safety margin. This
allows the pilot to accurately feel the sensations of flight, and thus develop an active flying
style. Rapid progression up the learning curve is enabled, as the pilot becomes acquainted with
usingthe speed and performance of this wing. TheBoomerang4willallow you to experiencethe
fullpleasureoffreeflightwiththehighestperformanceavailable today.
For Pilots Who …
The Boomerang 4 is a perfect competition glider and is suitable for the very experienced pilot
who flies frequently and wants the highest performing glider. The Boomerang 4 is designed for
all kinds of flying, from ridge soaring to thermalling, but is optimized to go further in cross
countryortowincompetitions.
Cutting-edge Design
Gin and Robert have made extensive improvements in the Boomerang 4 compared to the
Boomerang 3. Performance, climbing and top speed have been improved without sacrificing the
levelofsecurityrequiredbycompetitionpilots.
Countless prototypes have been built, tested and compared to find the optimum. A new plan
form, high aspect ratio anda new profile give this wing incredible performance andhigh solidity.
A special shape for the reinforcements has been introduced and all the air intakes are optimized.
The patented Rigifoil System is used to have a clean leading edge, especially at high speed. All
thisimprovestake-offcharacteristics,performanceandincreasesthelifetime of the canopy.
The brake line layout is designed for fast and flat turning, with proportional brake pressure for
light and direct handling. This enables efficient and easy climbing in thermals as well as using
weak lift when ridge soaring. The Boomerang 4 pulls nicely into thermals and therefore allows
youtonegotiateeventurbulentthermalswithouttheneedto use a lot of brake action.
Amodifiedrisersystemgivesyouhighertopspeedand a better sink rate at speed.
Weight and drag have been reduced by using a new hi-tech, lightweight fabric and a special mix
ofthinlines.
TheBoomerang4competitionversionusesthinunsheetedKevlarlines.
These and other innovations ensure that by purchasing the Boomerang 4, you are getting the
bestpossiblegliderinitsclass.

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Manufacturing
All GIN gliders are produced in the company's own facilities using the most modern techniques.
Highly skilled staff take extreme care during the entire manufacturing process. Stringent
quality control is made after each step, and all materials that go into each wing can be traced.
These measures guarantee that pilots fly with the assurance that their wing meets the most
exactingsafetystandards.

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3. Before you fly
Pre-delivery Inspection
The Boomerang 4 is delivered with speed system, rucksack, inner bag, compression strap, repair
tape and this manual. Your instructor or dealer should have made a test inflation followed by a
testflightbeforedelivery.
Speed System
The speed system increases the maximum speed by lowering the angle of attack with a pulley-
guided, foot-operated system. More than 20 km/h gain in speed can be realized with the
acceleratoratfulltravel.
It is important to have your accelerator system correctly routed through your harness and
attached to the risers with the supplied Brummel hooks. The length of the speed bar should be
initially adjusted while on the ground, sitting in the harness so that the legs are fully extended
at the point of full accelerator travel. It is helpful to have an assistant hold the risers taut
while making this adjustment. Subsequent fine tuning can be done on the ground following the
first flight with the speed system. If in doubt about this procedure, consult your instructor or
dealer.
Riser A B C D
lengthattrimspeed 52cm 52cm 52cm 52cm
lengthatfullspeed 30cm 34cm 44cm 55cm
D1 D2

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Brake line adjustment
The main brake line lengths of the Boomerang 4 have been fine tuned by GIN test pilots, and it
shouldnotbenecessarytoadjustthem.
In soaring flight, it is common to fly with half a wrap on the brakes and hold the handles on the
knot.However,careshouldbetakentoreleasethewraps in any extreme situation.
If you do need to make adjustments to suit your harness, body and flying style, we strongly
recommend that you test fly the glider with every 2cm of brake adjustment. There should be a
minimum of 10cm of free brake travel when the glider is flown hands-off. This prevents the
brakes being applied unintentionally when the speed system is fully engaged. We recommend a
doublesheepshankorabowlineknotforthebrakehandle attachment as shown in the diagram.
Rucksack
All Gin gliders are delivered with a durable ripstop KODURA®rucksack, designed for ergonomic
carryingcomfortandeaseofuse.
The rucksack should be packed carefully to achieve maximum comfort. First, place the glider
inside the harness and then put the top of harness in the bottom of the rucksack with the glider
side next to the back of the rucksack. Finally, tighten the internal and external compression
straps and adjust the shoulder and waist straps to ensure the equipment stays firmly in place
whenwalking.Therearealsotwostoragepocketsforaccessories.
AnXXLrucksack(200Lcapacity)isavailableasanoptionalextra for pilots that require it.

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Your harness
The Boomerang 4 can be used with all harnesses with variable cross-bracing (GH type). 99% of
harnesses produced after 1993 are of the GH type. Older harnesses with fixed cross-bracing (GX
type) should not be used. Check with the manufacturer of the harness or your paragliding
instructorifindoubt.
The adjustment of the harness chest strap controls the distance between carabiners and affects
the handling and stability of the glider. Tightening the chest strap increases stability but also
therisk of twisting afterglidercollapse.Lengthening it gives more feedback from the glider but
decreasesstability.
Gin calculates and draws the plan of the glider with a distance between the carabiners of 44cm.
We recommend setting a distance of 42cm to 50cm between the carabiners, depending on the
sizeanddesignoftheharness.
Recommended Weight Range
The Boomerang 4 should be flown within the recommended weight range given in the reference
section at the back of this manual. The weightrange is quoted as the total weight in flight, i.e.
the weight of the pilot, glider, harness and accessories. The easiest way to check your total
weightistostandonweighingscaleswithallyour equipment packed into your rucksack.
Pre-flight safety
Toflythisequipmentyoushould:
Haveappropriatepracticalandtheoreticaltrainingandexperienceforthis class of glider.
Havethenecessaryinsuranceandlicences.
Beinyourrightmind,unaffectedbyextremestress,recreational or prescribed drugs.
Onlyflyinconditionssuitableforyourlevelof paragliding.
Wearsuitableheadprotection,useacertifiedharnessandemergency parachute.
Makeathoroughpre-flightcheck.
Followthemaintenanceinstructionsatthebackofthismanual, especially with regard to
thecompetitionlines.

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4. Flying the Boomerang 4
We recommend that you firstpractice inflating your glider on asmall training hill or flat ground.
Makeyourfirstflightswithyournewparaglideringentleconditionson a familiar flying site.
Preparation for launch
Following a consistent method of preparation and pre-flight checks is vital for safe flying. We
recommendthefollowing:
On arrival at the flying site, assess the suitability of the conditions: wind speed and
direction,airspace,turbulenceandthermalcycles.
Inspectyourglider,harness,reservehandleandpin,helmetand any other equipment.
Chooseasufficientlylargetake-offareawithevengroundand no obstacles.
Laytheglideroutaccordingtotheplanform,andget the lines and risers sorted out.
Putyourhelmeton.Secureyourselfinyourharnessanddon't forget the leg loops!
Connect the risers to your harness carabiners, ensuring there are no twists or loops
aroundthelines.
ConnectthespeedsystemtotheriserswiththeBrummel hooks.
Do a final line check by pulling gently on the risers or lines to ensure there are no new
knots,tanglesorinterferingbranchesorrocks.Takeextracare in nil or light winds.
Pre-flightcheck list
Reserveparachute:pininandhandlesecure.
Helmetandharnessbucklesclosed.
Linesfree.
Canopyopenandintowind.
Airspaceclear.
Take off
The key to a successful launch technique is to practice ground handling on flat ground whenever
youcan.
Lightor NilWind Launch
The Boomerang 4 inflates steadily in nil-wind conditions. Simply guide the glider with the A-
risers, keeping your arms bent and hands at the level of the shoulders. Allow your arms to rise
in an arc and wait for the glider to inflate and come above your head do not push the risers.
There is no need to pull the risers hard. Run positively as the glider comes above your head. Be
sure to look up and check that the canopy is fully inflated before you take-off, and that there
are no tangles in the lines. If any irregularity should occur and you are not yet airborne, abort
the launch immediately by stalling the glider. On steep launches, stall one side ofthe glider and
runparalleltothehill.

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If the glider should come up sideways, and the situation is recoverable, run towards the lower
sideratherthantryingtostruggleagainsttheforce.
StrongWind Launch
The reverse launch technique is recommended. Holding the brakes, turn around to face the wing
passing one set of risers over your head as you turn. We suggest building a "wall" by partially
inflating your glider on the ground, thus sorting out the lines thoroughly. Check the airspace is
clear and gently pull the glider up with theA risers. When the glider is overhead, check it gently
with the brakes, turn and launch. In stronger winds, be prepared to take a couple of steps
towardsthegliderasitinflatesandrises.
Line knots or tangles
If you do take off with a line knot or tangle, try to get clear of the ground and any traffic before
taking corrective action. Weightshift and/or counterbrake to the opposite side and pump the
knotted side with your brake. Be careful not to fly too slowly to avoid a stall or spin. If the knot
ortangleistootighttopumpout,immediatelyfly to the landing zone and land safely.
Min sink / best glide
The minimum sink speed is achieved by pulling approximately 10 cm of brake. The theoretical
bestglidespeedincalmairisrealizedatthe hands-off position.
Accelerated flight
Once you have become accustomed to flying the Boomerang 4, you can practice using the speed
system,whichallowsimprovedglideinheadwindsandgreaterpenetration in strong winds.
Apply the speed system by pushing the speed bar progressively with your feet. Be prepared to
control roll by using weightshift and pitch by varying the amount of bar. Keep a very light
pressureonthebrakesinordertofeelthecanopy.
Avoidflyingacceleratedneartheground,andbecarefulusing the accelerator in turbulence.
If you do encounter a collapse while using the accelerator, immediately step off the bar
completelybeforetakinganyothercorrectiveactions,asdescribedbelow.
Active flying
The Boomerang 4 has a high internal pressure, resistance to tucking and a base level of passive
safety. However, it is recommended that you always practise an active flying style. This will
help you avoid deflations in all but the most turbulent conditions. The key to active piloting is
keeping the glider above your head at all times. If it falls back behind you, let up the brakes. If
it surges in front of you, counterbrake until the surge is controlled. If you sense a loss of
pressure on one side of the canopy, smoothly apply brake and/or weightshift on the appropriate
side until you feel pressure return. In all cases, maintain adequate airspeed and avoid
overreaction.

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In turbulence
Deflations of the canopy can occur in strong turbulence. The Boomerang 4 will recover in most
situations, but it’s recommended to open it in a controlled manner with the brakes. Only if the
wing surges very fast in front of you should you stop it with the brakes. However, it is
recommendedthatyoufollowtheadvicebelowinorder to help the wing recover more rapidly.
Asymmetricdeflation
In the event of encountering strong turbulence and suffering an asymmetric deflation (collapse
on one side), the Boomerang 4 will have a tendency to re-inflate by itself, but the wing will turn
towards the collapsed side. This might be unwanted close to the ground or other gliders.
Maintain your course by weightshifting away from the collapsed side. This action can be aided
by applying a little force on the brake opposite to the deflation. Thiswill normally be sufficient
for recovery. However, it is sometimes necessary to pump out the deflated side with a firm and
smoothpumpingmotion.Letthegliderregainitsflyingspeed after it has re-inflated.
Ifyouhaveabigcollapse-especiallywhenflying accelerated - you must observe the following:
When a big collapse happens, due to the difference in weight and inertia of the canopy and pilot,
the pilot will continue to travel forward and the canopy will fall behind the pilot, especially
when flying accelerated. You must wait until you pendulum back below the canopy before
reacting and carefully counter braking the open side of the canopy. If you react too early, you
risk stalling the collapsed canopy completely and the following scenario can become
uncontrollable.
When you have a big collapse in accelerated flight you must first release the speed bar
immediately. Stay neutral with your weight and brake the open side slightly. Let the glider turn,
if you have enough space. This is the optimum action to avoid a spin or stall and help your
glidertorecoverasfastaspossible.
Symmetricdeflation
A symmetric (frontal) deflation will normally reopen by itself without strong pilot input. The
glider will regain airspeed with a small surge. If counter braking, be careful not to over-correct
ortobraketooearly,whenthegliderisstill behind you - danger of a stall!
Cravat/ gliderwrapped aroundlines
A cravat occurs after a severe deflation when the wingtip becomes trapped in the glider lines. It
can occur on the Boomerang 4, usually after big deflations or in cascading situations. The pilot
should be familiar with the procedure for correcting it. Counter brake and/or weightshift and
pump the brake on the tangled side. On the Boomerang 4 there is a separate stabilizer/winglet
main line that goes down to the C-riser. This line usually becomes slack in the event of a cravat.
Pullitdowncompletelyuntilitbecomestightandthe cravat normally comes out.

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Flatspin
In normal thermalling flight, you are very far from thelimits of a flat spin. Nevertheless, should
this occur, just let up the brakes and wait for the glider to surge forward, checking it with the
brakes if it surges too far. Never release the brakes if the glider is far back behind you, always
trytoreleasethemwhenthegliderisaboveor in front of you!
Cascadeof events
Many reserve deployments are a result of a cascade of over-corrections by the pilot. Please
notethatover-correctionsareoftenworsethannoinputat all.
Losing altitude
Extremely strong and widespread lift is found, for example, in storm conditions. The best place
to be in this situation is on the ground. Nevertheless, if you have been caught out by the
weather and find yourself needing to descend rapidly, there are several ways to do so. The best
way is, of course, to find sink. Failing that, try one of the techniques below. Most of these
techniques place undue stress on your glider, and should be avoided if you wish to extend its
lifetime. We recommend you initially practice these manoeuvres under qualified supervision
duringa safety training course.
Bigears
Big ears is a safe method of moderately losing altitude while maintaining some forward speed.
Pull in big ears one at a time, using the outer A line oneach side. Although the noise of the wind
around your ears may indicate the airspeed increases, the airspeed does not increase by pulling
big ears. In fact it decreases. You may use the speed bar in combination with big ears to
maintainyoursinkratebutincreaseforwardspeed.
Theglidercanbesteeredwhileinbigearsusing weight shift alone.
When you release the lines, the Boomerang 4's ears will come out on their own, or may require
a short pump. Release the big ears at least 100m above the ground. If this is not possible, keep
the big ears in until you flare for landing rather than letting them out on the approach. This is a

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safer method because of a possible wind gradient close to the ground and your low
airspeed/highwingloadingwithbigearsin.
Spiraldive
Thespiraldive should be considered an extrememanoeuvre.Practicespirallingwith caution and
lesser sink rates to get a feel for the Boomerang 4's behaviour. Weight shift and pull the brake
on one side gradually. Let it accelerate for two turns and you will enter the spiral dive. Once in
the spiral, you can control your descent rate and bank angle with weight shift and the outer
brake.
WARNING! A pilot who is dehydrated and/or not accustomed to spiralling can lose
consciousness in a steep spiral dive! Aswith alltypes ofaircraft, weadvise youto assistthe
glider to exit from the spiral dive in a controlled manner. Let the glider decelerate for one or
two turns by applying outer brake and/or weight shift. Due to its long lines the Boomerang 4
cangenerateextremelyhighG-force ina spiral dive. You should use only moderatespiralssoas
nottoputunnecessaryloadonyourlines.
B-stall
To quickly loose altitude without straining your body with G-force you can use the B-stall.
Reach up to the B-risers just below the maillons and twist your hands while gently pulling. It
will be difficult at first, but become lighter the more you break the airfoil. Once pulled, do not
release immediately. The glider needs to settle into a stable B-stall beforereleasing. On exiting
the B-stall the Boomerang 4 has a good dive without deep stall tendencies. We advise you to
releasetheB-stallsymmetricallywithbothhandsinadecided manner.
Fullstall, dynamicstall
This is an extreme manoeuvre and there should never be any need to perform one in normal
flight.
Do not take wraps with your brakes before entering a full stall. Keep your hands close to your
body during the stall, and lock them under your harness seat plate if necessary. In a stable full
stall, the canopy will oscillate back and forth. Before releasing the stall, raise your hands
slightly and evenly to fill the glider with air. If possible, let the brakes up when the glider is in
front of you to avoid excessive surge. The Boomerang 4 will surge forwards to regain airspeed
and you need to counter brake the dive when the wing surges towards the horizon and then let
up the brakes to regain the complete airspeed of the wing again. Be careful to not stall the
glideragainwhendampingthesurge.
Never attempt a stalland then change your mind and release the brakes, asthe glider will surge
radically.
Deepstall (parachuting,stable stall)
The Boomerang 4 does not have a tendency to get into nor stay in a deep stall. Should this
nevertheless occur, put your hands on the A risers and push forward to gain speed. On some
modern harness/accelerator setups, you can reach the speed bar without using your hands. If so,

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push the speed bar. Never try to steer out of a deep stall and make sure your brakes are
releasedcompletely.
You can recognise a deep stall by the glider getting "mushy" and the airflow around your ears
decreasing. Flying in strong turbulence or exiting a deflation with too much brake applied can
cause this situation. A wet glider also has a higher deep stall tendency. If you pass some rain,
acceleratealittleandneverinducebigearsinthis situation.
Steering without brakes
If a brake is not operational for some reason, you can steer the Boomerang 4 with the D-risers.
Add steering input by weight-shifting in your harness. Be careful not to steer too much with the
risertoavoidanypossibilityofaspin.
Aerobatics
The Boomerang 4 is not designed for aerobatics and in most countries acro flying is forbidden.
Besides the inherent risks, extreme manoeuvres of any kind place unnecessary stress on the
glider and effectively shorten its lifespan. We strongly recommend no acro flying or
unnecessary manoeuvres on the Boomerang 4 to avoid weakening your glider and especially it’s
lines!
Landing with the Boomerang 4
Select a familiar landing area free of obstacles and carefully note the wind speed and direction
in the landing area. The minimum flying speed and big flaring reserve of the Boomerang 4 will
help you to make a soft landing in all conditions. Approach the landing with sufficient airspeed
anddon'tleaveyourlastturntoolateortoo steep.
Before landing, slide your legs forward in the harness so that you adopt the standing position.
NEVER land in the seated position; it is very dangerous for your back even if you have back
protection, which is only a passive safety system. Standing up before landing is an active
safetysystem,andismuchmoreeffective.
Tow launch
The Boomerang 4 is suitable for towing by pilots who have the relevant towing rating. The
Boomerang 4 has no tendencies towards deep stall/parachuting. There is sufficient margin to
counter steer the glider in a normal towing situation. Make sure you use proper equipment,
experienced personnel, the recommended techniques and all relevant safety precautions for
towing.
Motorized flight
MotorizedflyingwiththeBoomerang4isnotrecommended.

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5. Care, Maintenance and Repairs
The materials used in the Boomerang 4have been carefully selected for maximum durability and
performance. Nevertheless, following the guidelines below will keep your paraglider airworthy
and will ensure a long period of continuous safe operation. Excessive wear is caused by
careless ground handling and packing, unnecessary exposure to UV light, chemicals, heat and
moisture.
Ground handling
Thefollowingshouldbeavoided:
Violentshockstotheuppersurface(e.g.whenthecanopy crashes to the ground leading
edgefirstwhilstgroundhandling).
Draggingtheglideralongtheground.
Steppingonthelinesorcanopy.TheKevlarlinecan take lots of pulling force without
stretching,butissensitivetobendingwithsmallradius.
Openingyourwinginstrongwindswithoutfirstuntanglingthe lines.
UV damage
Avoid leaving the glider and your lines out in the sun unnecessarily. UV rays from the sun
degradeparagliderclothandweakenKevlarlinesrapidly.
Packing instructions
We advise you to pack the glider accordion wise' as shown in the diagram. This packing
procedure takes slightly longer and is easier with an assistant, but it conserves the rigidity in
theprofilereinforcementsandtheRigifoils.
Sincefoldingthegliderweakensthematerials,packtheglider as loosely as possible.

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Transport and Storage
Moisture is the worst enemy for your glider, adversely affecting the ageing of fabric, lines and
reinforcements. The Boomerang 4 should therefore be kept dry and cool. Do not pack the glider
away for a prolongedperiod if it is damp, sandy, salty, or if other objects have entered the cells.
Always allow it to dry naturally before storage in a dry room. Leave the rucksack zip open
whenever possible to allow residual moisture to evaporate, and do not transport or store the
gliderintheproximityofchemicalssuchas gasoline, paints or other solvents.
Cleaning
Use only lukewarm water and a soft cloth to clean your wing. Never use any abrasive materials
or detergents. Only clean the wing if it is absolutely necessary e.g. after a landing in salt water.
Maintenance Inspections
GIN Gliders require the Boomerang 4 to be inspected by an authorized Gin agent after every 100
hoursflyingtimeoreveryyear,whicheverissooner.
Afullinspectionisrequiredfor:
After 12 months or max. 100 flying hours, whichever is sooner. The Kevlar competition lines
have to be replaced at the following intervals: Mainlines after 100 flying hours or 1 year and all
linesafter200flyinghoursor2years.
The maintenance instructions, which can be downloaded at www.gingliders.com, have to be
observed.
A full inspection will give you peace of mind and extend your glider's lifetime. Additional
inspections should be performed by a qualified person following a crash or violent landing on
theleadingedge,orifyounoteadeteriorationofperformance or behaviour.
You should also check for any damage to your lines, sail, risers and connectors before each
flight.
Repairs
Very small holes in the sail can be repaired with the sticky back tape provided with your glider.
Damaged lines should be replaced by your GIN dealer. Before fitting a replacement line, check it
for length against its counterpart on the other side of the wing. When a line has been replaced,
alwaysinflatetheglideronflatgroundtocheckthateverything is in order before flying.
Major repairs, such as replacing panels, should only be carried out by the distributor or
manufacturer.

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6. Technical Details
Load test
The GIN BOOMERANG 4 has passed load and shock tests with a load exceeding 8G of the
maximumweightinflight.

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Technical Specifications
SIZE XXS XS S SM M ML L
AREA 23.1m² 24.1m² 25.15m² 26.2m² 27.3m² 28.4m² 29.5m²
SPAN 12.60m 12.88m 13.15m 13.42m 13.7m 13.97m 14.25m
FLAT
A.R 6.86 6.86 6.86 6.86 6.86 6.86 6.86
AREA 20.38m² 21.27m² 22.19m² 23.13m² 24.08m² 25.05m² 26.06m²
SPAN 10.18m 10.40m 10.62m 10.85m 11.07m 11.29m 11.51m
PROJECTE
D
A.R 5.1 5.1 5.1 5.1 5.1 5.1 5.1
ROOT 2.37m 2.42m 2.48m 2.53m 2.58m 2.63m 2.68m
CHORD
TIP 0.63m 0.65m 0.66m 0.67m 0.69m 0.70m 0.72m
TOTALHEIGHT
7.79m 7.96m 8.13m 8.3m 8.47m 8.64m 8.8m
CELLNUMBER 25X 3 25X 3 25X 3 25X 3 25X 3 25 X3 25X 3
GLIDERWEIGHT (kg) 6.2 6.4 6.6 6.8 7.0 7.3 7.5
WEIGHTIN FLIGHT
(kg) 70~ 80 78~88 85~95 93~103 100~11 0 108~11 8 115~12 5
COMPLINE LOAD TEST

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Line Plan