Small DLG

23 May 2016

Assuming that the wooden strip is 900mm long and I want to use a single strip for this flying wing and I want to use a WLToy's F929 F939 receiver with Flysky transmitter:

1. Cut the 900mm length of wooden strip to two unequal lengths: 600mm long and 300mm long.
2. The 600mm long piece is glued to the wing piece of 600mm x 120mm x 3mm foam and it forms the leading edge.
3. The 1st 100mm of the 300mm piece is the nose, and the wing begins after this 100mm mark. The boom extends (300-100-130=70mm) past the trailing edge to receive the vertical tail.
4.  The WLToy's F929 939 receiver board is first hotglued to a 2mm basswood mount. The mount is hotglued against the leading edge of the wing, check that the battery wires clears the 3mm leading edge.

If the wooden strip is 1000mm long, then it is 600+400, and tail end is 400-130-130=140mm.

6 February 2016

Here's an idea for a small DLG using WLToys' F929 F939 receiver with Flysky transmitter. Another Flying Plank.

1. 3x10mm wooden strip from Daiso (Basswood?) for leading edge and fuselage strip.
2. Leading edge glued to 3mm foam sheet wing, basically a rectangular planform with perhaps rounded tips, and with elevens.
3. Length of fuselage strip is 3x root chord.
4. Glue receiver on the nose end of the fuselage strip, just in front of the leading edge.
5. Battery is held with rubber band to nose end of the fuselage strip, in front of and below the receiver.
6. Glue the top of the fuselage strip to bottom of the wing.
7. Glue a 3mm foam fin to rear end of fuselage strip.
8. Bind and glue a throw peg to the leading edge.
9. If CG is too forward, the battery may be mounted with Velcro on top of wing behind the receiver.
10. It would also be easy to modify the glider to accept a WLToys F929 939 motor and prop.

The wing loading of such a wing glider has to be lower than a conventional tailed glider and the CG very forward, near 15% of average chord. Size of wing will be determined by the mass and it has to be lesser than the receiver. The battery is to balance the fin and pushrods. The average chord shall be at least 4" so that it is wide enough for easier balancing of the model. Have a low aspect ratio and the fin need not be too big, conversely, a higher aspect ratio will require a bigger fin and perhaps a longer moment arm.

Let say I do a AR of 5 and root chord of 5". The span would be 25" and the area 100 sq inches. The fuselage strip will be 15".