OMPHOBBY BIGHORN 49" User manual

OMP Hobby 49” Bighorn is a sport RC model airplane built in the traditional way: balsa and film cover.
The airplane features light yet strong structure, and abundant power, making the airplane easy to fly and
capable of a lot of advanced aerobatics, such as hover. The big wheels provide enough clearance for easy
takeoff and landing on grass field. Flaps (if equipped) of the airplane makes it ideal for short field takeoff
and landing, and air brake in crow configuration.
The optional 49” Bighorn receiver ready version is an almost completed finished kit in factory. Motor, ESC,
servos, Ailerons, flaps, elevator, are all installed. Landing gear is preassembled. Propeller is included in the
kit. It takes no more than an hour to put the kit together and ready for the sky.
Wingspan
49in（1250mm）
Length
41in（1040mm）
CG: 58‐ 66mmfromtheleading
edgeofmainwings
Wing Area: 27.4dm² or 425
square inches Wing Loading: 49.7~51.5g/dm² Flying Weight: 1365~1410g
Motor: Sunnysky X2820
1100KV Outrunner ESC: 40A Battery: 3S 11.1V LiPo, 2200~3000mAh
Propeller: SunnySky Eolo
12x6.5” electric propeller
Servos: 6 (flap version) or 4
(non-flap version) of 17g
OMPHOBBY metal gear digital
servos.
Flight time: 5~12 minutes
www.OMPHobby.com www.OhioModelProducts.com 1

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Packagecontents(receiverreadyversion)
Three color schemes available
1. Fuselage
2. Lefthalf wing
3. Righthalfwing
4. Horizontal
stabilizer
5. Rudder
6. Tube
7. Adhesive
Velcro
8. Spinner
9. Link Rods
10. Landinggear
11. Propeller
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*Mainlandinggearhasbeenassembledin
factory.
*Allballtierodsarepreassembled.
*Allservohornshavealreadybeeninstalled.
*Allballjointshavebeeninstalled.
*Hingeslotsarecutinfactory.
*Servoleadstapedforeasyaccess.
*Thecowlisinstalledinfactory.
MainFeaturesoftheAirplane(receiverreadyversion)
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Horizontal stabilizer and
elevator installation
1. Insert the horizontal stabilizer into the
fuselage.
2. Insert the carbon tube of main wings into
fuselage, to ensure that the horizontal
stabilizer is parallel to the carbon tube.
3. Appy CA glue to secure horizontal
stabilizer.
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1. Insert rudder hinges into slots in vertical
stabilizer.
Rudder Installation
2. Ensure that there is 1 ~ 2mm
clearance between fuselage and rudder.
3. Apply thin CA glue to secure the hinges.
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Landing Gear Installation
1. The mounting screws of landing gear are
installed on the fuselage to prevent missing
parts.
3. Align the landing gear to the hole locations
and tighten the three screws. Application of
threadlocker is highly recommended.
2. Take out the screws from the bottom of
fuselage with 2.5mm Alan screwdriver.
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Installation
of Tail Wheel
Align tail wheel
assembly to the rear
bottom of fuselage
as shown in the
photos. Make sure
the gear is centered
and pivot is aligned
to rudder hinges.
Install screws at
locations as shown in
the photos.
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Installation of
Servo Link Rods
1. Servo horns are installed at
center position in factory.
Hook servos to a receiver to
check center point if
necessary.
2. Level the control surfaces,
and set rudder arms at 90
degree positions.
3. Adjust the link rod length by
turning the ball joints to
appropriate positions.
4. Push the ball joint head to
the ball head by using pliers
or hand.
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Installation of
Spinner
Installation sequence of spinner
parts:
aluminum alloy base plate →
propeller → washer → nut →
spinner → two screws.
Installation of
Servo Link Rods
(continued)
5. Electrify the servos to make
sure all the control surfaces
are installed in the center
positions.
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Recommended Settings of Dual Rates and
Exponentials of Control Surfaces
Lowrate Lowrateexp Highrate Highrateexp
Ailerons 60 40% 100 40%
Elevator 50 30% 100 30%
Rudder 60 30% 100 30%
Flaps 80 ~ 100 ~
ForcustomersupportintheUSA,please
contactOhioModelProductsinOhio.
Tel: +1‐614‐733‐9488 (9am‐5pm,ET)
Email: [e-mail]
Website:www.OhioModelProducts.com
ForcustomersupportoutsideoftheUSA,
pleasecontactOMPHobby inChina.
Tel:+86‐755‐8672‐4337
Email:[e-mail]
Website:www.OMPHOBBY.com
DisclaimerandSafety
•Thisproductisnotatoy.Itisnotrecommendedforchildrenunderage14.
•Fly the airplane by abidingbylocal lawsand rules.
•Flytheairplaneinadesignatedlocation,andalwaysmaintainvisualcontactoftheaircraft.
•Avoidflyingdirectlyoverunprotectedpeople,movingvehicles,andoccupiedstructures.
•ReadthesafecodeofAMAbeforeflight.Theguidelinecanbedownloadedfromthefollowinglink:
www.modelaircraft.org/files/100.pdf
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