Century Helicopter Products Schweizer 300 Scale User manual

CenturyHelicopterProducts
DesignedandDevelopedintheUSA
3stEditionDec.2000
Schweizer300Scale
BodyKit
InstructionManual
SPECIFICATIONS
YELLOW or RED GELCOAT FIBERGLASSYELLOW or RED GELCOAT FIBERGLASS
YELLOW or RED GELCOAT FIBERGLASSYELLOW or RED GELCOAT FIBERGLASS
YELLOW or RED GELCOAT FIBERGLASS
CRYSTAL CLEAR WINDSHIELD & WINDOWSCRYSTAL CLEAR WINDSHIELD & WINDOWS
CRYSTAL CLEAR WINDSHIELD & WINDOWSCRYSTAL CLEAR WINDSHIELD & WINDOWS
CRYSTAL CLEAR WINDSHIELD & WINDOWS
OPENABLE PILOT DOORSOPENABLE PILOT DOORS
OPENABLE PILOT DOORSOPENABLE PILOT DOORS
OPENABLE PILOT DOORS
REAR SCALE STRUTSREAR SCALE STRUTS
REAR SCALE STRUTSREAR SCALE STRUTS
REAR SCALE STRUTS
SIMPLE QUICK RELEASE MOUNTINGSIMPLE QUICK RELEASE MOUNTING
SIMPLE QUICK RELEASE MOUNTINGSIMPLE QUICK RELEASE MOUNTING
SIMPLE QUICK RELEASE MOUNTING

1
BuildingInstructionsfortheSchweizer300scalebodykit
Introduction
CongratulationsonyourpurchaseoftheCentury Helicopter Product’s Schweizer 300scale helicopter
body kit. This kit offers an easy entry into scale radio controlled helicopter flying whether you are just
beginning into helicopters, getting into scale or an accomplished pilot. Though designed for the proven
reliability of Century’s Hawk helicopter mechanic Your new helicopter is sure to be an attention grab-
ber at your local flying site.
Warning
ThisSchweizer 300 body mustbe assembled and installedstrictly in accordance withthese instructions.
Failure to do so could cause failures in the body structure or the helicopter mechanics. Such failures
could result in serious injuries. It is recommended that if you are in doubt of your abilities, you should
seektheassistancefrom experiencedradiocontrolmodelers andassociations.Asa manufacturer,we
assume no liability for the use of this product.
Pre-assemblyInformation
Upon opening the Schweizer 300 body kit, you will find the major fiberglass and clear component parts
and hardware bags. Hardware is identified by size of the fastener or part. This is done for ease of
assembly. Becareful when openingthe bagsas notto lose anyhardware, wheneverpossible keepall
screwsin a container until you usethem up through the assembly process. Carehas been taken in the
filling and packing of each bag. However, mistakes do happen. If there is a shortage or missing hardware,
pleasecontactusat:
Century Helicopter Products
523Sinclair FrontageRoad
Milpitas, CA 95035
[phone]

2
Schweizer300ConstructionManual
This manual has been written to cover assembly of the Schweizer 300 Conversion kit CN1033 and isthe
supplemental instructions for the full kit CN1030 to work in conjunction with the Hawk III instruction
manual. Through following the instructions, modifications can be made to the mounting for other
helicopters in the 30-46 class. This instruction set is a supplement to the Hawk helicopter instruction
manual, changes are listed below to the major areas that are different than the original kit.
Everyattempt has beenmade toease theassembly ofyourSchweizer 300.At eachstep wherethere is a
complex assembly, detailed written instructions are provided to walk you through the building process.
Take a few minutes before each step to review the instructions, examine the hardware utilized in that
step, and compare the drawings & pictures to your work in progress.
Schweizer 300 Body Kit Complete Steps 1 through 10
Schweizer 300 Hawk Conversion Kit Complete Steps 11 - 18
Symbols used to help assist you in building the kit:
Hardware Description and Identification: M3x6 = 3x6mm and can refer to screws or fasteners.
Apply
threadlock
Special
Attention
Repeat Steps
as specified Partially
tighten
Purchased
Separately Cut away
Shaded
Portion
Helpful
Tip
The tools and materials listed below are the
minimum needed to build the Schweizer 300.
Screwdrivers - Slotted and Phillips head.
Hex Key 2.5mm
Long-Nosed Pliers.
Paper Clip
Scissors & Ruler
Locktite (thread lock liquid)
Clear cellophane or masking tape.
Drill and drill bits (1/16”, 1/8”)
RecommendedTools&Accessories
In addition, the following will make
assembly and setup easier, and prove
useful later in your model toolbox:
Primer and paint to match box art.
5.0mm Open End Wrench.
5.5mm Open End Wrench.
7mm Open End Wrench.
Apply
“Goop”
M3x6 Self Tapping Screw
M - metric
3 - diameter
6 - length
M3x10 Socket Cap Screw
M - metric
3 - diameter
6 - length

Step3
In a similar manner, trim excess material from oneof the clear plastic
cabin door windows. Again, the clear window material is to be glued to
the insideof the door frame. For easy reference, position each door in
the cabin and mark the inside surface with a pencil. Note that this
trim process must be a little more exact in order to fit properly, the
door window should only extend about 1/8" beyond the window
opening. When satisfied with the fit, apply glue the door opening with
“goop”adhesive. Make sure the adhesive isthoroughly set before
proceeding to any additional step using the door. Repeat for the
opposite door, Make sure you build a left hand and a right hand door.
Make one left and
one right side.
Apply to
insideedge.
3
Step2
To attach the front windshield to the fiberglass cabin,
carefully trim along the outsideof the marked line. Note
that the clear window is glued to the insideof the fiber-
glasscanopy. Trim such that when the clear plastic
bubble is inserted into the fiberglass cabin from the
inside about 1/4" of the clear plastic material extends
beyond the window boundary. When satisfied with the
fit, glue the clear plastic to the fiberglass with “goop”
adhesive.It is notnecessary to gluethe window frame
strips to the clear plastic window. Apply the adhesive
only to the perimeter of the fiberglass cabin. With final
positioning of the windshield, take short lengths of
cleartape and apply overthe fiberglass strips onthe
outside of the cabin to hold the windshield in place
whilethe adhesive dries. Makesure adhesive isthor-
oughlyset before preceding to any additional step
utilizing the main cabin.
Tip:Use a small blade screw driver to apply the
adhesive to the window/cabin joint. Attempting to
apply the adhesive directly from the tube will likely
result in runs on the exposed areas of the window.
Step1
Prepare the fiberglass, wash all parts in warm water with mild detergent to remove all residue used in the molding
process and let the dry completely. The cabin set can be used as is with the bright yellow gelcoat, simply applying
the decals directly on the fiberglass. Alternately the cabin can be painted to match an existing full scale Schweizer
300 or create your own unique paint scheme. When custom painting, read through the instructions and make all
the necessary holes in the parts but do not attach any of the major components. Apply paint (remember to use a
fuelproof paint) and complete alldetailing before final assembly, somereopening of drilled holes maybe necessary
that may have filled in during the painting process.
Apply to
inside
edge.

Step4
On the bottom of the canopy there are two small indentations. Drill two 3mm (1/8 inch)
hole at these marks. Locate the Inside Canopy Mount [HI3129]. Note that this mount is
designed to fit one direction, the wider end should face towards the helicopter. Attach the
mount to the inside of the cabin utilizing two 3x10 self tapping washer head screws.
Step5
The cabin has the four holes predrilled for the
rubber mounting grommets. Install one grommet at
a time and bond in place using “goop” on the inside
of the cabin overlapping the outside edge of the
grommet.
grommets
4pcs
Step6
Insert a spring loaded hinge pin into both the upper and lower hinge locations on one
of the doors. Center the hinge pin within the door frame with the door closed. Make
two marks on the outside of the cabin at each hinge with a pencil. Straighten out a
paper clip bend the last 1/4” with pliers 90 degrees. Heat the bent end of the paper
clip while holding with pliers and insert along the marks previously made. Insert into
the solid section of the cabin hinge (the bent section) the hot metal will melt perfect
size holes into the hinge pins. Before installing the door, add a small amount of
“goop” to the paper clip and push into the hole, install the door into the cabin by
compressing the hinge pins while sliding the door into new holes, allowing the spring
loaded pins to “pop” into the holes you have made. Repeat this process for the other
door.
Step7
Attach the main rotor guard to the top of the cabin with
“goop” adhesive. Use two pieces of tape to hold in
position while the adhesive dries. Allow to thoroughly
setbeforeproceeding.
4

Step9
Attach the mounting bracket to the gasoline tank tray
with two 3x8mm socket cap screws and 3mm lock nuts.
Position the bracket on the rear set of holes. Repeat this
processonthe secondgasoline tanktray, makingsure
that you construct a left side tray and a right side tray. It
is possible to attach the brackets and end up with two left
(or right) hand sides.
Make one left
and right side.
Step10
Locate the two guide marks on the bottom of
the fuel tanks. Drill two 1.5 mm (1/16") holes
at the marked positions. Attach the gasoline tank
to the tank tray using two 3x10mm self tapping
screws.Apply a smallamount of “goop”adhesive
between the tank and tank tray before tightening
downthe screws. Makesure you orientate the
tank correctly in the tank tray. Repeat this process
for the second tank.
If you lightly coat the self tapping screws
with “goop” adhesive, you will be less likely to
causecracksinthegasoline tankfiberglass.
Make one left
and right side.
5
Step8
Beginthe gasoline tank assembly bylocating the gasolinetank
holding trays. Inspect the bottom of the tray and locate four hole
location marks. Drill all four marks with a 3 mm (1/8") drill bit.
Repeatthisprocess on thesecondtray.
Make two
parts.

This completes the major assembly for the Schweizer 300 body kit, the next section covers installing the cabin set
onto a Hawk helicopter kit. For those mounting on another helicopter brand, some modifications will be necessary
to adapt to your helicopter. The following steps show the changes to the Hawk III instruction manual to mount the
cabinset. It is recommended to havefinished the helicopter assembly includingservo and pushrods.
Step12
In step 25, remove the two 3x16mm self tapping
screwsfrom the upper rear servo tray positions.
Insertone 3x25mm threaded stud oneach side,
half way into these two holes. Apply threadlock to
the remaining threads and tighten the Body Mount
Postsagainstthe servo frame.Pleasenote, thatthe
rudderandelevatorservoarereversed,changethe
leadsgoing to thereceiver and the pushrodsat-
tachedtotheservos.
Step11
In step 12, the short black ball has to be installed as shown,
this is opposite to the instruction manual and is required
forclearance onthe elevator pushrod.
Shortsteel ball
change.
Step13
While looking at the nose of the helicopter, attach the completed
cabin set to the helicopter by starting from 45 degrees and align one
side body mount post with the rubber grommet on the correspond-
ing side and engage the bottom hook. Lift the rear remaining edge
and flex the cabin gently to engage the second body mount post.
Attach one fuel tank assembly by engaging the front tank molded
pin into the mating grommet on the cabin rear. While looking
from the side mark with a pencil through the hole in the bracket on
the lower side frame. Remove the fuel tank and measure 21mm (1
1/16”) horizontally across from the frontmost lower frame hole. At
this intersection, drill one 1/16” hole approximately 1/2” deep into
the plastic frames. Reinstall the fuel tank and insert one 3x8mm self
tapping screw through the bracket to secure the tank. Repeat for the
other side. To remove the cabin you do not need to remove the
screws,simply separatethe tanks andgently flex the cabin around
one body mount post and rotate the cabin to remove. 6

Step 15
Drill two 1/8” holes through each fin at the locations
marked in the recesses. Using two 3x10mm Socket Cap
Screws and 3mm locknuts attach the rear straight fin
closest to the tail gearbox at a 45 degree angle. Donot
overtighten these screws as you will damage the tail fins.
Slide a tail pushrod guide in-between and mount the
vertical tapered fin straight down at 2” infront of the first
fin. Bend the 9” tail wire in a large radius as shown,
remove the locknut on the lower mount (previously for the
vertical fin) and attach one 3mm hex nut using threadlock,
next thread the machined standoff on the bolt until the
bolt is just visible through the vertical hole, slide the tail
wire in place and secure using one 3x4mm set screw using threadlock. Position the wire to run vertically
down while the curving backwards.
Use threadlock
on the set screw.
Step 14
The tail boom, tail pushrod guides and tail boom supports should be painted at this time before assembly.
Remember that the pushrod guides may need to have the in-
side holes sanded slightly larger to fit the painted tail
boom.
At Step 28, dis-assemble the tail pitch plate assem-
bly by removing the lock ring carefully and re-
verse the pitch plate (part between the ball bearing
and the tail pitch ball links). Reassemble the parts
and epoxy or JB Weld the lock ring in place.
At Step 32, mount the bellcrank with the pitch plate
assembly engaged. While assembling the tail rotor
grips, examine the individual grips, one half has the
recess molded for the 2mm nuts. This half of the grip has
to be facing away from the gearbox when complete. Wait
until the next step to attach the tail rotor blades.
At Step 35, the tail pushrod guides have to be installed on the tail
boom in the correct order with the strut and fin mounts. Starting from
the tail gearbox, two fin mounts, one pushrod guide, two more fin mounts, one pushrod guide, one strut
mount, one pushrod guide, and lastly one strut mount. Position the gearbox halves over the tail boom so the
tail rotor assembly is on the left side of the helicopter (this is opposite to the Hawk instruction manual). In this
position the tail pitch bellcrank will be on the top along with the pin from the pitch plate, tighten the gear box
bolts and remove the original vertical and horizontal fin. Now while turning the main gear clockwise (the
direction of rotation), attach the tail rotor blades with the leading edge on the same side of the ball on the tail
blade grip as shown in the photo.
7
Tail pitch
plate
change.
Ball is on the
trailing edge of the
rotor blade.
Nut side of
blade grip
face out-
wards.

8
Step 16
At Step 37, locate the two sets of tail
boom supports (one long set and one
short set). Loosely attach one end of
each of the short boom supports to
the strut mount closest to the front
using one 3x16 Socket Cap Screw
with 3mm Locknut. Similarly,
loosely attach the longest set of tail
boom support rods the rear most
strut mount using one 3x16 Socket
Cap Screw with 3mm Locknut.
Bring the two struts together, insert
one 3x16mm Socket Cap Screw through the longer strut then the shorter strut and through the
hole in the side frames and secure with one 3mm Locknut on the inside. Once both sets of struts
are tightened on the lower side frames, align the struts and tighten the ends on the tail boom.
Step17
The tail boom beacon can be detailed and is recom-
mended to be bonded to the rearmost strut mount.
Whendisassembling the tail for maintenance,or
replacement it will come off with the struts.
Step18
After attaching the rudder pushrod, follow the directions in Step
44 to setup the tail rotor control, remember that the rudder servo
and pushrod are mounted on the right side of the helicopter.
Adjust the positions of the tail pushrod guides to get the smooth-
est pushrod action, once this is finalized glue the guides in place
with a few drop of Fast or Medium CA type glue. By using a
fewdrops the guides can be easily removed if changing the tail
boombecomesnecessary.

ScaleDetailing
Detailing a scale model is a job that is never completed. The Schweizer 300 lends itself to a variety of scale “improvements”
because of the simple nature of the full scale helicopter.
Detailinga scale model requires the desire to proceed, some skill, and a great dealof patience. It requires constant decisions of
scale fidelity verses practically verses flight stability. The most important tool you have in detailing a scale model is photo-
graphs of the full scale you are attempting to duplicate. The prototype Schweizer 300 used in the production of this kit was a
traffic reporter helicopter for radio station KIIS - FM.
Some of the easy things you can do include coloring the main rotor blades, applying the decals in the proper locations and
paintingsome of the components.
ColoringtheBlades
The full scale has main rotor blade that are black in color. To achieve this effect, remove the white heat shrink covering from
the provided rotor blades. Do this by carefully running an Xacto blade down the inside of the heat shrink, just as if you were
opening an envelope with a knife. Cover the blades with black Monokote or Ultracoat - both work equally well. Check the
bladebalance when you’redone, just tobe sure; althoughthe balance shouldnot be changedby this recovering.
9
Conclusion
This concludes the conversion for the Hawk III helicopter kit. For those customers adding the Schweizer 300 to a
Falcon or Phoenix kit follow the same instructions with a change to Step 12 where the fuel tank mount to the
frame, drilling the frame needs to more accurate to keep the tapping screw secure in the aluminum. An alternate
solution may be required.
Installation to other brands is simple requiring changes to the location on the helicopter mechanics to mount the
cabin and the fuel tanks. Contact our technical support staff to provide assistance with other brands.
DecalPlacementonSchweizer300
DANGER DANGER
CAUTION CAUTION DANGER DANGER
Fuel Tank Sides
Bottom Front Cabin
Fuel Tank Straps
( 2 per tank )
Tail Boom
Rear
Below Door
Fuel Tank Sides
Tail Boom
Front Fuel Caps &
Tail Beacon

10
Painting
A text book can (and has) been written on painting models. Our prototype was painted with Chevron’s Perfect Paint, but
similar results can be expected from any of the popular hobby related paints. It is important to make sure any part to be
paintedhas been thoroughly degreased and lightly sanded, including anymetal parts.
The tail boom should be painted off the helicopter. First use primer on the boom with automotive spray can primer that is
availablein any discount automotiveparts stores. We prefer the white primersbecause they seem tomake the color coats more
brilliant when done.
The tail boom, from the front up to the short tail boom supports, including those supports is white in color. From the short
boom supports and all the way back to the tail rotor transmission is yellow in color, including the long boom supports. The
yellow should match the color of the cabin gel coat. Both fins are red in color, as is the rotor blade guard on the top of the
cabin. The red should match the red of the decals provided. The gasoline tank trays should be flat black in color.
The tail rotor blades are black with a white stripe about 3/4” wide right in the middle of the blade. Be careful of maintaining
balance when adding paint to the tail rotor blades. A little goes a long way in this high RPM environment.
Final touches would include painting the navigation light beacon bright red, and the gasoline tank filler caps a bright silver
with a red top cap. This can be done with plastic model paints. Decals are provided to simulate the gasoline tank hold down
straps.
AddedRealism
Study the photographs or a full scale example to see where you might be able to add a scale antenna, handle or lettering. Every
little bit helps make your model more unique.
A feature that helps, if you are an experienced pilot, is to move the skids forward in the landing gear struts. This arrangement
more closely resembles the full scale. Keep in mind that this scale “tweak” will make landings a little less stable......one of those
tradeoffs previously mentioned.
Conclusion
All of the above constitutes a step towards scale R/C helicopter flying. While you may not be ready to compete in the World
Championships, you will likely have the most unique and admired helicopter at your flying field.
RubberGrommets 4
Magnets 2
Body Mount Post 2
Fuel Tank Support 2
Tail Boom Bracket 6
9” Wire 1
Wire Standoff 1
M3x8SocketCapScrew 4
M3x10SocketCapScrew 4
M3x16SocketCapScrew 6
M3x25Threaded Stud 2
M3x8Self Tap Screw 8
Hinge Pin 4
M3x4SetScrew 1
M3 Hex Nut 1
M3 Locknut 12
Schweizer300BagPartsList

OptionalAccessoriestoCompleteyourSchweizer300
Totruly makeyour Schweizer300 scale, the high performance 3 bladescale rotorhead isavailable.
This rotor head consists of an all metal assembly, dual ball bearing aluminum main blade grips
which feature the I.D.G. system (Individual grip damping) to dampen each blade individually to
eliminate turbulence vibration which is crucial for super smooth flying with Century’s multiple
rotorblades. Century makes all the components required forthis conversion:head assembly,3
blade swashplate, custom follower and main rotor blades. Available for both 8 and 10mm main
shafts.
I.D.G. Jr multi rotor
headCN1113
WeightedMain Blades
CN2327A
Custom
Swashplate
CN1107-3 Swashplate
Follower
CN1108
Custom
Pushrods
All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or
transmitted in any form or by any means, electronic, mechanical, photocopying, recording or
otherwise, without the prior written permission of the publisher, Century Helicopter Products.
CN1033-1 Front Fiberglass Cabin Only w/Fairing & Beacon (Red or Yellow)
CN1033-2 Windshield Only
CN1033-3 Front Fiberglass Cabin & Front
Windshield (Red or Yellow)
CN1033-4 Side Door w/ Side Window
(1 side only, Red or Yellow)
CN1033-5 Fuel Tank w/ Support Tray
(1 side only, Red or Yellow)
CN1033-6 Quad Tail Support Struts
CN1033-7 Horizontal & Vertical Fins
(Red or Yellow)
CN1033-8 Wire Tail Skid Assembly
CN1033-9 Decal (Red or Yellow)
CN1033-10 Tail Fin & Boom Support Clamps
CN1033-11 Canopy & Fuel Tank Mount set
CN1033-12 HardwarePack
Schweizer300ReplacementPartList
CN1113 Multi 3 blade rotor head (30/46 size)
CN1107-0 Multi swashplate conversion ring w/ball end
CN1107-3 Swashplate - 3 blade (8 & 10mm shaft )
CN1108 Swashplate Follower (8 & 10mm shaft) -
Keepsswashplatetimedtomainblades
CN2327A 3 Blade Multi Main Blade Set (550mm)
When order parts from local dealer or fromWhen order parts from local dealer or from
When order parts from local dealer or fromWhen order parts from local dealer or from
When order parts from local dealer or from
us, please give color code (yellow or Red).us, please give color code (yellow or Red).
us, please give color code (yellow or Red).us, please give color code (yellow or Red).
us, please give color code (yellow or Red).