Junkers D1, Arup S2, Caproni Stipa

4 October 2016

An idea for a funfly version of a Stipa-Caproni: Flat sheets, large elevons and rudder (stubby wings) and it can do knife-edge and other 3D maneuvers?
Fuselage shall comprise 1 horizontal and 2 vertical pieces.
The top vertical piece includes the fin and the horizontal piece includes a pair of stubby wings and enlarged elevator.
The motor, receiver board, rudder servo and 1S battery are mounted to the horizontal piece.
The vertical pieces are braced to the horizontal piece with diagonal sheets.
Undercarriage structure comprises of a spar under the stubby wings, 2 struts cross at the bottom of the vertical piece which has a length of spar to spread the load. Heatshrink 2 soft wire pieces to the lower ends of the struts and glue on the wheel pants.

4 February 2016

How about a simple scale model of the Junkers D1? RET. Maybe I can print (laser print) stripes on paper, transfer stripes to coloured tissue, and use tissue as covering over foam model?
Simple sheet wings perhaps with single crank or rolled airfoil, or build up spar and cap strips over sheet wings?
Or maybe a cartoon scale type with deep fuselage (additional dihedral effect)?
Anyway, the dihedral, nose length and the tail areas have to be increased.



How about the Arup S2? Instead of 3 moving (+2 if tips are considered), let there be 2 elevons?
Sheet wing, foam fuselage bottom, paper fuselage top.





Maybe a ducted propeller scale model?
The rear tube of the Caproni Stipa shows to be parallel on the side view but tapered on the top view.
That could be represented by a foam tube, then slit V-cut at the top and bottom and join the edges together.
Instead of cones on cones or curved V cuts, how about just a simple straight tube, straight V-cuts for the tail end as described, then when that is done, 4 V-cuts in a X-manner at the nose and further division of V-cuts in between the previous V-cuts? Saves glue...
If cone on cone, instead of making all those calculation, just roll a rectangular piece of foam sheet into a cone, adjust, mark off, cut, glue.
I think RET would be simpler then 4-channel. The wings are so long, and they have bracing, so might as well give them dihedral.
As usual, increase fin/rudder and stabiliser/elevator.
Only thing is, if the WLToys propeller is to be inside the cowl, I think the model is going to be very big..., with wings beyond 30"? Make a cartoon version with stubby wings?