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CONSTRUCTION

 

MANUAL

www.oldschoolmodels.com

Using the Manual

Be sure to read each step thoroughly before you start 

the step. Test-fi t the parts together to make sure they 

fi t properly. If necessary trim to fi t.

Beside each step you will notice a check box (or two). 

These are so you can keep track of your progress 

while building your kit. For steps that have two boxes, 

as in the construction of the left and right wing halves, 

these steps must be performed two times.

• Your 

Old School Model Works

 aircraft should not be 

considered a toy, but rather a sophisticated, working 

model that functions very much like a full-size airplane. 

Because of its performance capabilities, this model, if not 

assembled and operated correctly, could possibly cause 

injury to yourself or spectators, and damage to property.

• You must assemble this model according to the 

instructions. Do not alter or modify this model, as doing 

so may result in an unsafe or un-fl yable model. In a few 

cases the instructions may differ slightly from the photos. 

In those instances the written instructions should be 

considered as correct.

•  You must take time to build straight, true and strong.

• You must use a R/C radio system that is in fi rst-

class condition, a correctly sized power system and 

components (electronics, batteries, 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 manual is a 

suggestion. You may have to adjust the mounting steps 

to accommodate the size of your radio equipment.)

•  You must check the operation of the model before every 

fl ight to insure that all equipment is operating and that 

the model has remained structurally sound. Be sure to 

check clevises or other connectors often and replace 

them if they show any signs of wear or fatigue.

•  If you are not an experienced pilot or have not fl own this 

type of model before, we recommend that you get the 

assistance of an experienced pilot in your R/C club for 

your fi rst fl ights. If you’re not a member of a club, your 

local hobby shop has information about clubs in your 

area whose membership includes experienced pilots.

•  While this kit has been fl ight tested to exceed normal 

use, if this model will be used for extremely high stress 

fl ying, such as racing, or if a power system larger than 

one in the recommended range is used, the modeler is 

responsible for taking steps to reinforce the high stress 

points and/or substituting hardware more suitable for the 

increased stress.

Remember: Take your time and follow 

the instructions to end up with a well-

built model that is straight and true.

Specifi cations

:

Wingspan: 56 in. 

Wing Area: 560 sq in.

Airframe Length: 42.5 in. 

Weight: 3.75 - 4.5 lb.

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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