The Sweep Stick (Two Sheets to the Wind)

MZ250Ben

Member
It's "stock up for combat" season here in NE Ohio, so I have pile of foam and electronics waiting to be cobbled into aircraft of short life expectancy. I've been working with a self-imposed 2-Sheet constraint, the first attempt, "Lil- Whiz" was a resounding success. I "designed", built and flew it all before 11 am at FF last year, and it has performed just as I wanted it to. So now, I'm using the same wing in a swept configuration to build a model that looks like something I drew when I was 4 based on a picture of a jet plane printed on my underpants. It's coming along nicely, I think. I may do something different with the wing mounting if I build another, possibly detached ailerons so it can be fused then slid through. For now, I built a "cradle" of plywood and plan to sandwich plywood similarly on top with glue and dowels/screws. The span is minimal, but wing load will be heavy. I've been using the doubling-up technique for the stabs, and I think the results are fantastic, albeit not without consequence of mass. I used to count grams in my balsa/NiCAd/400 speed days, but with the hardware we have now, one could nearly compel a cinderblock to aerobatic flight. I had to split the elevator as the halves do not share a hinge vector, so some fiberglass rod, glue and shrink tube did the trick. Opted for a 9-gram here for the extra load created by the flexing rods, they splay outward with up elevator and vice-versa for down. I have neither built nor flown a constant-chord swept wing craft, so this will either be awesome or hilarious in action. And yes, the control horns are a cut-up gift card.
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MZ250Ben

Member
Nice design. I like the ironed edges and doubled up gift card control horns. What are you using for a spar?
I have a bunch of carbon fiber practice arrows I got to make slow sticks, so no shortage of THAT around here for spars. Slipping it all together will be a challenge, in the current configuration, the halves can't slide straight together unless I distort the wing cut-outs. I will probably end up making a spar with the same sweep angle by bending a short piece of heavy piano wire and gluing it into two carbon tubes, then build a small "mold" of maker foam and cast a block of epoxy resin or plastic putty around the apex. Weighty, yes, but I'll need the forward mass with that long tail arm and doubled stabs. I don't use an iron for the edges, btw. I carve a V-notch into the edge, then use my mini glue gun to inject a nice bead and press it on the table with a flat steel square, using the tilted up end to reckon the taper angle.:ROFLMAO: kinda low budget here.
 

Bricks

Master member
All my combat planes the fuselage sides are doubled from the motor mount to behind the trailing edge of the wing and all leading edges are packing taped.

It is an interesting design you have come up with, no rudder?.
 

MZ250Ben

Member
All my combat planes the fuselage sides are doubled from the motor mount to behind the trailing edge of the wing and all leading edges are packing taped.

It is an interesting design you have come up with, no rudder?.
It'll have vert stab, but fixed rudder for now. I just have it doweled on at the moment. I won't glue it til I have to so I can work on the rest of it without breaking it off early. I should have V-tailed it, in retrospect...
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MZ250Ben

Member
I'm curious of the mixing. elevons AND Ailerons????
Had I V-tailed it, I could have done that, but as it is now, the elevator halves are mechanically fixed together on one servo (servo with both pushrods lashed as one can be kind of seen in the third pic, I think). What would be cool would be to have independent servos on the elevator halves that work in unison normally, but have a mix on a switch that makes them follow their respective aileron. You could do a screaming pass with a slight upward line, hit the mix and just roll so fast the wingtips go back in time. With V-tail, I suppose one could roll hard left and give full right rudder to achieve a similar effect. If this one flies well, there will be variations like that.