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Construction Manual

WARNING

READ THROUGH THIS MANUAL 

BEFORE STARTING CONSTRUCTION. 

IT CONTAINS IMPORTANT WARNINGS 

AND INSTRUCTIONS CONCERNING 

THE CONSTRUCTION AND USE OF THIS 

MODEL.

A Radio-Controlled aircraft is not a toy!

If misused, it can cause serious bodily harm 

and damage to property. Fly only in open 

areas, preferably at AMA (Academy of Model 

Aeronautics) approved fl ying sites, following all 

instructions included with your radio, powerplant, 

electronics and batteries.

• Inspect your model before every fl ight to ensure it is airworthy.

• Be aware of any other radio frequency user who may present an 

interference problem.

• Always be courteous and respectful of other users in your 

selected fl ight area.

• Choose an area clear of obstacles and large enough to safely 

accommodate your fl ying activity.

• Make sure this area is clear of friends and spectators prior to 

launching your aircraft.

• Be aware of other activities in the vicinity of your fl ight path that 

could cause potential confl ict.

• Carefully plan your fl ight path prior to launch.

• Abide by any and all established AMA National Model Aircraft 

Safety Codes.

IMPORTANT!!! 

Two of the most important things you can 

do to preserve the radio controlled aircraft hobby are to avoid fl ying 

near full-scale aircraft and avoid fl ying near or over groups of people.

INCLUDED ITEMS

Wood parts included in this kit:

•  1 - LP1 - laser cut 1/8” x 5" x 24" ply

•  1 - LP2 - laser cut 1/8” x 5" x 24" ply

•  1 - LP3 - laser cut 1/8” x 2" x 24" ply

•  1 - LP4 - laser cut 1/8” x 5" x 24" ply

•  1 - LP5 - laser cut 1/8” x 5" x 24" ply

•  1 - LP6 - laser cut 1/8” x 2" x 24" ply

•  1 - LP7 - laser cut 1/16” x 5-3/4" x 3" ply

•  2 - BP1 - laser cut 1/8” x 4" x 24" balsa

•  1 - BP2 - laser cut 1/8” x 1" x 24" balsa

•  2 - BP3 - laser cut 3/32” x 4" x 24" balsa

•  2 - BP4 - laser cut 3/32” x 4" x 24" balsa

•  1 - BP5 - laser cut 3/32” x 4" x 24" balsa

•  2 - BP6 - laser cut 3/32” x 4" x 24" balsa

•  2 - BP7 - laser cut 3/32” x 4" x 24" balsa

•  2 - BP8 - laser cut 3/32” x 4" x 24" balsa

•  1 - BP9 - laser cut 3/32” x 4" x 24" balsa

•  1 - BP10 - laser cut 3/32” x 4" x 12" balsa

•  1 - BP11P -  laser cut 1/8” x 4" x 12" balsa

•  1 - BP11S - laser cut 1/8” x 4" x 12" balsa

•  1 - BP12P - laser cut 1/8” x 4" x 12" balsa

•  1 - BP12S - laser cut 1/8” x 4" x 12" balsa

•  1 - BP13 - laser cut 1/8” x 4" x 12" balsa

•  2 - BP14 - laser cut 1/16” x 4" x 24" balsa

•  2 - BP15 - laser cut 1/16” x 4" x 24" balsa

•  1 - BP16 - laser cut 1/16” x 4" x 24" balsa

•  2 - BP17 - laser cut 1/16” x 4" x 12" balsa

•  2 - BP18 - laser cut 1/16” x 4" x 12" balsa

•  1 - 1/16” x 4" x 12" balsa sheet

•  2 - 1/2” x 1/2” x 36” balsa strips

•  2 - 1/4” x 1/2” x 36” balsa strips

•  2 - 1/4” x 1/4” x 36” balsa strips

•  4 - 3/16” x 3/16” x 36” balsa strips

•  4 - 1/8” x 1/8” x 36” basswood strips

•  4 - 1/4” x 1/4” x 36” basswood strips

•  2 - 5/16” x 1-1/4” x 36” tapered balsa strips

•  1 - 1/4”x 6” wooden dowel

•  1 - 3/16”x 6” wooden dowel

Hardware parts included in this kit:

•  8 - magnets

•  2 - pre-bent main gear wires

•  1 - nose gear assembly

•  C/A type hinges for control surfaces

•  4 - control horns

•  2 - wheel collars 5/32” I.D.

•  4 - plastic gear straps

•  8 - 2-56 x 1/2” machine screws

•  20 - 2-56 x 3/4” self tapping screws

Other items included in this kit:

•  2 - Rolled plans (fuselage and wing)

•  1 - Construction Manual

•  1 - Formed Canopy

ITEMS NEEDED

Hardware needed (not included in the kit) 

For some of these items there is more than one option which will 

require a bit of decision making ahead of time. There isn’t a right or 

a wrong choice, so choose the items that work best for you. 

We strongly recommended supporting your local hobby shop.

•  Powerplant: .25-.40 sized 2-stroke glow engine (or similar 

electric system)

• Propeller

•  Engine/Motor mount and mounting hardware

•  4-6 ounce fuel tank and fuel tubing (if glow)

•  Receiver - (4 channel minimum)

•  4 servos (electric) or 5 servos (if glow) - we recommend standard 

servos all around, although you can use a smaller servo on the 

throttle, if using glow power).

•  “Y” servo harness (for ailerons)

WARNING: This product can expose you to chemicals including lead, which 

is known to the State of California to cause cancer and birth defects or other 

reproductive harm.  For more information go to www.P65Warnings.ca.gov.

Summary of Contents for Lark

Page 1: ...tteries wheels etc throughout the building process You must correctly install all R C and other components so that the model operates correctly on the ground and in the air Installation shown in the m...

Page 2: ...x 24 balsa 2 BP8 laser cut 3 32 x 4 x 24 balsa 1 BP9 laser cut 3 32 x 4 x 24 balsa 1 BP10 laser cut 3 32 x 4 x 12 balsa 1 BP11P laser cut 1 8 x 4 x 12 balsa 1 BP11S laser cut 1 8 x 4 x 12 balsa 1 BP1...

Page 3: ...tep or two which leaves you a bit puzzled If this happens step back and study the photo s for that step both in this manual and online All photos shown in this manual are of different Lark prototypes...

Page 4: ...erfectly aligned with top and bottom edges of their respective ribs Also the rear edge should be just on the edges of R2A and R4A should be aligned with the rear spar cutouts in each rib n n Step 9 Wi...

Page 5: ...ep 18 Wing Assembly SPACER With the ribs all in place carefully remove the SPACER pieces and then glue ribs R3 R2 and R1 to the spars Make sure you do NOT have any extra glue fouling the holes where t...

Page 6: ...moved flip it over and it s time to remove all the underside tabs that helped hold the ribs in place There s one in the front and one in the back of each rib On ribs R2 R7 these are balsa and easily c...

Page 7: ...ans n n Step 38 Wing Assembly aileron box SH Locate one SH from LP5 This should now fit in the area between the SH1 s you just installed If not lightly sand as necessary to obtain a good fit Note that...

Page 8: ...aligned as shown here n Step 41 Wing Assembly ailerons Locate the two lengths of 5 16 x 1 1 4 tapered balsa sticks These are used as the ailerons Refer to the plan for the correct length then cut one...

Page 9: ...you ve properly aligned and centered it on the S7 ribs n Step 58 Vertical Fin Assembly VF16 Remove the rudder assembly and flip it over Again lightly sand the structure so it s flat Then locate the o...

Page 10: ...lue and then make sure it is properly affixed to the TR1 assembly as shown here n Step 74 Fuse Assembly F4 WH5 Locate F4 from LP2 and the WH5 assembly you made earlier These are both attached towards...

Page 11: ...r as shown here This will guarantee that the alignment of the fuselage doesn t shift as work will now move towards the front of the fuselage n Step 84 Fuse Assembly lite ply box install With the fusel...

Page 12: ...the time to sand the leading edges of the stab and vertical fin as they ll be much easier to do now than after installation Make sure that the leading edges are nicely rounded and you might want to te...

Page 13: ...lf from 3 32 sheeting scrap plenty to choose from the various BP sheets This sheeting should be cross grained and will fit snugly between the fuselage sides resting on the 3 32 square balsa longerons...

Page 14: ...from the fuselage n Step 104 Fuse Assembly magnets Locate the 8 magnets from the hardware bag as you ll use 4 of them in this step and 4 in the next Inside the tank battery area you ll see 4 pre cut...

Page 15: ...up next Here s a couple photos showing sample electric and glow installations Note that these are suggestions only as your power system might vary from our examples Glow power Mounting the engine is...

Page 16: ...all surfaces are smooth and ready to cover Sand as necessary then cover the entire airframe with the covering finish of your choice Note that if you re powering with an electric motor you ll need to...

Page 17: ...throws have been set cut a few pieces of medium silicone fuel tubing or heat shrink tubing to go around each of the clevises This will keep them from opening during flight Preflight Charge both the t...

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