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Jun 12, 2017, 02:55 AM
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Modified GLH II wings

I do not use more thickness than originals, as my goal is to acieve higher speed. Basically in the center I use a 17 cm (nearly 7") cord goe445 wich is simmetric and laminar with thickness increased to 7.4%, thus giving about 10 mm thick airfoil. On the tip I use a 11 cm (nearly 4 1/2") cord mh42 airfoil with thickness increased to 8.9 % to get an airfoil with the same thickness (in mm) as in the center with 1.7 negative incidence to get zero lift effect. In this way wings are neutral with constant thickness but absolutely no tip stall causing a sudden flip, if you slow the plane progressively increasing elevator up with no motor thrust it will start to sink flat.
All airfoils can be made with the program "profili" , which is free and can be downloaded here :

The material used is not the normal polystirene (white) foam, but the more compressed one (see photos); you will barely notice the weight increase, but the strength will be much higher.
Now the strengthening tecknique depends on the weight of the model and the speed you want to achieve and if wings will be swept or not.
for speed up to 200 km/h (125 mph) and flying weight up to 600 gr (22 onces):
- On the swept wing I use a .8 mm piano wire rolled up the soldering iron (see photo) to cut a 3mm deep x 1mm wide slot top and bottom of the wings at the max thickness point for about the 2/3 or 3/4 of the wing span in which I glue with foam safe ciano 3x1 carbon spars. Then I cover the wings with wet paper ( the packing avana one, light or medium) using slightly diluited white glue (top and bottom at the same time). Finally the wings are joined together and the joint covered top an bottom with light fiberglass for 5 cm (2")
-On straight wing I join the wing, then I cut with the same hot wire a 6 mm deep by 1 mm wide slot only on the bottom. I glue in the slot a 6x1 carbon spar.
I cover with paper in the same way, but both wings together with 1 single sheet top and 1 single sheet bottom same time.
I both cases paper is doubled where ailerons will be cut and they will be obtained cutting a triangular slot on the bottom and useing the covering paper as hinge.
Servos used will be:

which will confortably stay within the wings thickness.

In all other cases (higher speed or weight) wings will be covered with 0 .6/0.7 mm obeche or fiberglass under vacuum.
Last edited by eagle60; Aug 12, 2017 at 10:14 AM.
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Jun 15, 2017, 01:21 AM
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Off course these wings can be used in a lot of 1/2A models, like Hornet or Dominator, all those intended for speed race.
Sep 09, 2017, 04:38 AM
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Really good eagle60. See what I mean we all have something to teach each other, very impressed.

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