Great-planes Spectra Electric Sailplane Kit - GPMA0540 User Manual download pdf (Page 26)

the lines before you iron it in place. Also do not cover each

surface of the stab with one sheet of covering and then cut the

covering away between the lines. Doing this leaves "cut

lines" in the wood and greatly weakens the stab structure.

D 3. Follow the same procedure to check all four wing

panels and then go back and double check them. Sometimes

you put a warp in one panel while trying to fix another. You

should also look at the tail surfaces as they too can warp.

Recommended Covering Sequence:

1. Strips as described in above note

2. Fin left side

3. Fin right side

4. Rudder left side

5. Rudder right side

6. Bottom of elevator

7. Top of elevator

8. Stab bottom right side

9. Stab bottom left side

10. Stab top right side

11. Stab top left side

12. Fuse bottom

13. Fuse sides

14. Fuse top

15. Bottom of left wing panels (inner and outer)

16. Bottom of right wing panels (inner and outer)

17. Top of left wing panels (overlap covering 1/4" at

LE, TE and polyhedral joint)

18. Top of right wing panels (overlap covering 1/4" at

LE, TE and polyhedral joint)

GLUE THE HINGES

D 1. Lay the rudder and elevator on the plans and mark on

the leading edge of each part the locations of the hinges. Now

use a sharp hobby knife to cut slits in the covering at the hinge

locations. Trial fit the hinges to make sure you have'' found"

the slots which you previously cut. In the same manner, slit

the covering at the hinge locations in the stab and fin TE.

D 2. When gluing the hinges it is important that plenty of

glue gets inside the hinge slot. If you just put glue on the

hinge, most of it will be wiped off as the hinge is inserted into

the slot. A good way of getting glue into the slot is to scoop

up some epoxy with a plastic soda straw, then pinch the end

of the straw, insert it into the slot, and squeeze the straw to

force the glue into the slot. Apply epoxy to the hinges, insert

them into place (up to the middle of the hinge) and wipe away

all excess epoxy with a tissue (for best results dampen the

tissue with rubbing alcohol). NOTE: When using hinges

other than those supplied, follow the manufacturer's instruc-

tions.

CHECKING FOR WARPS

MOUNT THE TAIL SURFACES

This is a very important step and should be done every

once in a while throughout the flying season. A sailplane's

wing is most efficient when it is not twisted or warped at all.

"Washout" (wing trailing edge twisted up at the tip) helps

make a poor wing design fly better by adding some stability

(preventing stalls) at slow speeds but it cuts down on the

wing's efficiency at normal speeds. The SPECTRA'S wing is

designed to fly well at slow speeds without any washout, and

therefore we recommend you check to make sure the wings

are "flat'' using the following procedure.

D 1. Set the wing so an inner panel is resting on a flat

surface. Any warp (twist) will show up by causing a comer

of the panel to rise off of the work surface.

D 2. To remove the warp, gently twist the wing in the

opposite direction while a helper glides an iron or heat gun

over the covering on both the top and the bottom of the panel

to re-shrink the covering. Hold the twist until the covering

cools and then recheck for warps. It may take several tries to

get a warp out but it is worth it as you will end up with a

sailplane that flies straight and true and responds to air

currents like a high performance sailplane should.

D 1. Insert the 1/4" wing dowels in the holes and secure

with thick CA.

D 2. Rubber band the wing onto the fuselage making sure

it is square and centered with respect to the fuselage.

D 3. Position the stabilizer on the fuselage and measure

to get it centered and properly aligned. Glue the stabilizer to

the fuselage with either thick CA or epoxy. Check its

alignment with the wing while the glue is curing to make sure

they are parallel with each other.

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Great-planes Spectra Electric Sailplane Kit - GPMA0540 User Manual Page 26

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