Slab flyer

20 July 2023

Diamond airfoil = 1st point Leading edge, 2nd point Trailing edge, 3rd point Upper ridge, 4th point Lower ridge.

Triangle airfoil = 1st point Leading edge, 2nd point Trailing edge, 3rd point Upper ridge.

1st to 2nd points = chord.

3rd to 4th points = thickness. 

Cambered diamond = higher 3rd point Upper ridge than 4th point Lower ridge (or flat if triangle airfoil is)

Angled diamond = higher 1st point than 2nd point.

26 October 2021

1s, 3 channel, direct drive, indoor wing, minimal work.

Wing from 1/2" expanded foam, it has sufficient strength without spars or ribs. It has to be a wing, for extra area and chord. Leading edge can be sanded roundish but trailing edge is better tapered, leave the fuselage area square. A reflexed airfoil is just tapered on top leading edge and bottom trailing edge. Use thin foam for elevons.

Approximate foil will do, most of the shaping is at the back half of the chord. Say it is for a tapered or parallel chord wing with cambered foil and here's a method using a short bow cutter:

• Use some double sided tape on a steel rule to stick on the trailing edge, line the trailing edge about 6mm away from the steel edge.
• Use some double sided tape on another steel rule and line one edge to around 40-50% chord of the wing.
• Use a short hot wire cutter across the two steel rules to cut the tapered waste. The trailing edge will be a few mm thick, it can be feathered down or just lightly rounded to give the edge some ding resistant. 

Fuselage from 1/2" expanded foam, any profile is ok, the only caring bits are the wing joint to minimise glue. Fin is thinner foam butt glued to fuselage or wing tips. This is the profile fuselage with minimal work.

Using WLToys all in one board, cut a clearance slot at fuselage and wing joint, just below the wing seating. No need to cut if separate servos, receiver etc.

Stick a bamboo to gearbox, or bind motor to bamboo. The bamboo can glued in slit of wing or fuselage.

Tissue or tape, over 1/2" foam will give strength.