We are pleased to announce
can supply superb quality, "fully cored" wings.
Templates on hand so far:
|1957 Nobler - TopFlite
1952 Nobler - Aldrich
1968 Gieseke Nobler
Nakke - Kari
Time Machine - Dixon
Patternmaster - Greenaway
Stiletto 660/XL - McDonald
Stiletto 35/40 - McDonald
KA-10 - Kolesnikov
Epic - Armour
Impact - Walker
Cavalier - Simpson
F-51 - Sieverling
Oriental - Rice
Extra 300 Profile - Dixon
Avanti - Baron
Chipmunk - Van Loo/Sig
Cardinal - Brodak kit
Foam Wing Cores
Wing Mounted L.G. setup, add $25.00
Shipping (USA) $10.00
(Allow 2-3 weeks for production and shipping)
|Avanti 60 - Baron
Barecat - Baron/Netzeband
Stylus - Dixon
Praxis - Dixon
CDMax - Buso
Bearcat/SU-26 - Williams
Olympus - Van Den Hout
Chief II - Veco
Jamison Nats Favorite - Jamison
Skylark - Southwick
Shark 45 - McFarland
Shark 35 - McFarland
Dolphin - McFarland
Skywriter - Zhang Xiang Dong
Supermaster - Gabris
Time Machine 40 - Dixon
Gypsy 46 - Silhavy
38 Special - Dixon (both wings at regular price)
Mustant I or II - Rabe
(For designs not
already in stock)
template designs available from stock
Quick-Build Foam Wing
The following notes detail the
methods used to construct the wing panels. This method gives the straightest,
lightest, and certainly fastest and easiest method ever seen for
constructing a stunter wing.
1. Vacuum foam cores to remove all dust.
2. Glue 3/8" thick trailing edge to both panels using Titebond or
odorless foam compatible CA glue.
3. Lay 2"wide masking tape on panels just in front of trailing edge to
act as a barrier, and carve and sand trailing edge to match airfoil contour. Remove
4. Place 1/16" x 1-1/2" trailing edge sheeting in place on rear of
panel. Tape front edge of trailing edge sheeting to the foam.
IMPORTANT NOTE: If your foam core has a slight
"bow" in it, it is of no concern. Place the panel on a flat surface,
center of the bow upwards, and proceed to step #5. The foam panel will straighten in
the process of attaching the trailing and leading edge sheeting.
5. Fold the trailing edge sheeting forward by the tape "hinge,"
and apply foam compatible CA glue (medium) to trailing edge strip and to foam where
sheeting will be in contact. Return sheeting to the panel and hold in place with
both hands, applying pressure against the sheeting so that the trailing edge maintains
contact with the flat table top. You will feel slight heat when the CA glue cures
(15 to 20 seconds). DO NOT USE "KICKER" - it melts foam! You can
glue booth trailing edge sheeting pieces in place in one step, or do one at a time.
One at a time is better, if a bowed core is to straightened.
6. Tape 1/16"x4" leading edge planking to core so that rear of
sheeting corresponds to rear of foam "spar" in the core at both root and tip.
7. Fold sheeting back and apply a 1/8" wide band of foam compatible CA
glue to the sheeting. Return sheeting to the foam core and hold in place on a flat
surface, as you did in step #5.
8. Once glue has cured, "roll" wing core forward and trim front
edge of sheeting pieces so that they will overlap leading edge of foam core about
3/16" or so.
9. After trimming leading edge sheeting, prepare 6 to 8 pieces of 2"
wide masking tape about 2 feet long. Have them hanging where you can reach them
10. Holding wing panel leading edge upwards, "dribble" foam
compatible CA glue into area where sheeting will contact foam. Use enough so that
full glue contact will result when sheeting is pulled into place, but don't worry about
covering every bare spot. A glue pattern similar to where "ribs" would be
on a wood wing is fine.
11. Pull leading edge sheeting pieces down to core with one hand (at center
of panel) and wrap tape completely around core with other hand, beginning at a trailing
edge, around leading edge, and back to trailing edge to hold sheeting in place.
Quickly work towards each end of panel, wrapping the tape every 3-4 inches. Re-tape
as needed to be sure wood is fully in contact with the foam.
NOTE: A very slight moistening with water of the outer
surface of the wood will allow it to bend to the leading edge curve more easily.
Allow to cure 15 minutes.
12. Remove all masking tape. Block sand leading edge sheeting flush
with foam. Attach 1/4" leading edge pieces with Titebond or foam compatible CA
13. Prepare sections of center section planking by edge-gluing pieces to
width needed to cover area between leading edge and trailing edge planking. It is
important that the outer edges of center section planking be cut at a slant. or curve, so
as to minimize stress points in the wing. At rear of leading edge planking, the
center section planking should be about 8-10 inches wide, measured from root of panel.
At trailing edge planking, it should be about 5 inches wide, leaving approximately
a 45 degree angle to edges of center planking.
14. Glue center planking pieces in place using foam compatible CA glue.
15. Carve or sand leading edge to shape.
16. Add "capstrips" using foam compatible CA glue or Titebond.
These may be applied in a geodetic fashion or perpendicular to the trailing edge
(similar to a typical balsa wing). It is not a critical matter which you choose.
17. Block sand wing panels smooth. True up root ends so that panels
will join straight, with no gaps, no dihedral, no "droop," and no unwanted sweep
of hinge line.
18. Add bellcrank/pushrod assembly to inboard
panel, holding bellcrank pivot wire in place with 5 minute epoxy.
19. Join panels with 5 minute epoxy. A pin at the leading edge and the trailing edge
will keep the panels from twisting relative to one another. You can use the cradles
to hold the panels while you join them, but I prefer to hold the outboard tip against the
floor, while I sight down the trailing edge to be sure there is no dihedral or droop.
As the glue cures quickly, this is not a long process.
20. Wrap the center section joint of the wing with 2 inch wide fiberglass tape, applied
with epoxy or CA glue.
21. Add tips, tip weight box, and flaps as usual.
22. Drill a 1/8" hole in each foam "open bay" so that it can
"breathe" into the hollow section of the wing. This prevents the covering
from "sagging" or "ballooning" as air pressure changes.
23. Vacuum the wings again before covering. If using iron-on film, follow the
manufacturer's instructions. For a painted finish, cover wings with Starline
PolySpan as it does not "sag" and touch foam when wetted with dope.
Dope contacting the foam will dissolve the foam. This will not cause a major
structural problem, but can affect appearance due to foam residue on the "back
side" of the covering material.
24. "External" bellcrank pivot mounts of 1/8" ply are added after the wing
is installed in the fuselage. These are 1 inch wide by the width of the fuselage,
and are to fit snugly between the fuselage side. Epoxy them to the wing and fuselage
sides, top and bottom of wing, and add a little more epoxy to the bellcrank pivot mount
where it protrudes through the plywood. Cut off excess pivot mount with a Dremel
25. Finish the rest of the model as usual.
Covering with Polyspan:
The bare framework receives a
coat of dope. Then apply the Polyspan by brushing thinned dope through it around the
periphery, rubbing it down with a finger to adhere it, and pulling out the wrinkles.
On large compound curves, such as
large surface of wing tips, Polyspan can be worked with a combination of stretching and
heat shrinking. The best technique is to pull out as many wrinkles as possible as
you work around the periphery, doping the material down. Polyspan can be stretched a
bit as you pull it, taking out the larger puckers. With the material doped down all
around, you can now apply heat (from a heat gun or iron) to shrink out the wrinkles.
Remember, Polyspan is water-proof and
cannot be shrunk with water. When you are finished with covering, apply two coats
of 50/50 dope. In most cases this will be sufficient to shrink the tissue.
Additional tightening required can be done with moderate heat from gun.
Using overcoat of fuel-proof dope or
epoxy may cause covering to sag. Simply apply heat gun to draw it back to
Polyspan Tissue Facts:
|Not a plastic film
Strong & Lightweight
Easy to Apply
|$15.00 per roll
(1 roll usually covers 2 panels)