Top-flite TOPA0135 User Manual download pdf (Page 45)

❏ 9. Use balsa filler to build up a small fillet

between the belly pan and the wing and fill any

other gaps between the sections of belly pan

sheeting. Trim the forward bottom fuselage

sheeting flush with former F-1.

BUILD AND FIT THE COWL

❏ 1. Use scissors (Kyosho curved scissors

recommended) or a new #11 blade and a hobby

knife to cut around the cut lines inside all three

parts of the ABS cowl.

❏ 2. Use a sanding block to clean up the edges

and to make any adjustments required for a flush

fit. Roughen the inside edges of all the joints with

coarse sandpaper, then fit the three parts together

and secure them with tape. Hint: If you will not be

installing the optional (but highly recommended)

Top Flite replica radial engine, trace the outline of

the aft edge of the front part of the cowl onto a

sheet of 1/8" lite ply. After trimming and fitting, this

will be the baffle to direct the air flow directly over

the head of the engine for optimal cooling (the

outline of this baffle is included with the replica

radial engine kit).

❏ 3. Carefully wick thin CA around the joints and

allow the parts to cure. Do not use CA

accelerator.

❏ 4. Use coarse sandpaper to roughen a 1" wide

strip along the top and bottom joints inside the

cowl. Use 30-minute epoxy to glue a 1" wide strip

of fiberglass tape along the top and bottom joints.

Hint: When the epoxy is nearly cured and still in a

“gummy” state, dip your finger in alcohol and “rub

down” the epoxy soaked glass tape to be sure it

conforms to all the curves and bumps on the

glue joints.

❏ 5. Roughen the glue joints on the outside of the

cowl with sandpaper. Fill the seams with Bondo

type automotive body filler.

❏ 6. Refer to the detailed drawings on the plans

and use a pen to mark the base of the twelve

die-cut 1/8" plywood Cowl Mount Block

Supports. Glue a hard wood Cowl Mount Block

to two bases to make a Cowl Mount. Make six of

these. Hint: Glue six blocks to the side of six

supports. After the glue cures, glue the remaining

six supports to the other side of the six blocks.

❏ 7. Use the template on the plans to cut the Cowl

Ring sections from the 1/2" x 1-3/8" x 24" balsa

sheet. Hint: Use 3M 75 repositionable spray

adhesive to temporarily glue the templates directly

onto the 1/2" thick balsa sheet. Cut the sections

out then peal off the paper templates.

❏ 8. Test fit the six cowl ring sections with the cowl

mounts on the front of the fuselage. Reference the

detailed sketch on the plans and note the location

of the cowl mount supports. Hint: With the elevator

and rudder removed from the model, you can stand

the fuselage up on its tail (carefully please) to

easily position the cowl mounts and cowl ring

sections. Make adjustments to the cowl ring

sections of necessary.

❏ 9. Mark the location of each cowl mount support,

remove the cowl ring sections, then permanently

glue the cowl mount supports to the firewall. Hint:

If you’re careful you can glue the cowl mount

supports to the firewall while the 1/2" balsa cowl

rings are in position.

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Top-flite TOPA0135 User Manual Page 45

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