Carl Goldberg GPMA0960 Gentle Lady - Manual (Page 16)

16
POWER POD OPTION
Make saddle from 1/16” ply x 2” x9-1/4”, grain going the
2” direction. Make center notches front and back for
centering with wing hold down bands. Position 1/16” ply
on wing with an approximately 1/4” overlap at leading
edge, and tape or band to curve of wing. While in this
position, add platform of 1/8” ply x 1-3/8” x1-3/4” with
1/8” ply or hard base wedge underneath front to provide
approximately 2 degrees upthrust. Center platform
directly over main spar and cement to saddle. Drill four
holes in base of power pod and screw to saddle platform.
After fuel-proofing, finish, etc. Add four pieces of
1/16” by 1/2” foam tape on underside of saddle to protect
top of wing surface.
COVERING
A good covering job should be preceded by careful sanding. Filling nicks and dents with MODEL MAGIC™, then more sanding.
Any irregularities in the wood surface will show on the covering, so a smooth sanding job is a must for appearance. A simple color
scheme, such as one main color plus some trim, is recommended for the novice.
COVERING THE WNG
1. First read the directions which are supplied with every roll of
covering. Cut a piece of covering slightly larger than one inboard
panel and remove backing.
2. Position covering on bottom of wing and, using a covering
iron (set at proper temperature), tack covering across center of
wing. Working outward, firmly tack the covering to all ribs, and
to the perimeter edges of the wing, gently smoothing out the larg-
er wrinkles as you go. Besides sticking the film firmly to the end
of the panel, run some of the film down the vertical side of the
rib.
3. After sealing all edges, glide iron (or use a heat gun) over inte-
rior area to tighten the covering. Trim and iron edges.
4. When the bottom of the panel has been completed, repeat the
process on the top side. Follow the same procedure for all wing
panels.
Whenever overlapping one piece of the film on top of another,
make sure you have at least 1/8” of the top firmly stuck to the
one below for the full width of the joint. Otherwise, with little
carelessness in tightening, you can find yourself having devel-
oped an opening to be patched. Where two transparent colors
join, use CGM ColorStripe 1/4” wide to cover joint lines.
TRUING WING AND SETTING WASHOUT
Truing the wing is an important step, and should not be
rushed or omitted. Also, “washout” (explained below)
improves the wing’s efficiency, and increases the glider’s
stability at slow speeds (prevents tip stalls).
1. Set inboard panel on a flat surface to detect warp. To
counter any warp found, twist panel slightly in direction
opposite to the warp, and hold position while gliding iron
over covering to re-tension structure. Repeat process
until panel is true.
2. Follow same procedure with other inboard panel.
3. Check first panel and correct any change caused by truing
second panel.
4. Block up wing as shown so polyhedral break and outboard
panel leading edge are flat on table. As necessary, twist
wing while gliding iron over covering. Repeat process
untill 1/4” washout is achieved
5. Follow same procedure for other outboard panel.