I can't help with the contra rotating props, but that is a sharp plane I haven't seen this one.
Someone will post up a answer to your question. Hope you continue to post your progress on this unique looking plane, and welcome to WattFlyer.
HobbyKing has (or at least had, I haven't looked at them lately) contra rotating motor units. Some of them are quite powerful.
I believe they are one motor with a hollow shaft driving one prop, and the other motor drives through the inside to power the other prop
Good luck, hope this helps
Not sure that 90 rotation is needed. Your retract unit will need to mount at an unusual angle. You should build a mock up of that section and see if you can find an angle that works. It may not be possible to exactly get scale function with a 90 degree retract unit - rotating or not.
If I had to guess you'll need to mount the units at say, 45 degrees to the vertical plane near the center so the retraction is backwards and in toward the center line. Make the gear doors and openings to fit. You may have to add rotation too but I'd see if you can make it work without. Tough to figure out without a 3d cad model.
Look at how folks have done F-16 landing gear. It has a similar motion.
If I had to guess you'll need to mount the units at say, 45 degrees to the vertical plane near the center so the retraction is backwards and in toward the center line. Look at how folks have done F-16 landing gear. It has a similar motion.
I made my first attempt to draw something in Google Sketch and (SORRY for the low qualqity...) got this rough drawing.
Do you mean something lie this?
Can't really tell what I'm looking at from your drawing. Here are some I did in Sketchup from different angles. Shows extended and retracted positions. Note that there is no rotation of the strut, just a simple 90 degree retract.
As told before, still needs some refinement (sanding).
One thing became clear to me-> if you cut a REAL CLARK Y, the bottom of the profile isn´t flat, is curved.
But in this size, the depron simple make it become completely flat.
So, with a 1,72 m wingspan depron wing, follow the KISS philosofy (Keep it simple, stupid!) and simply make your profile with a flat botttom...
In order to distribute forces in a grass field landing, the losangle reiforcements have been done.
My Dremel will arrive, after this I´ll cut the reinforcement glued in a wrong place (it must have a reiforcement in the CENTRAL depron piece, but the asshole who writes this info right now glued it in other psition...
One more Dremel mission: cut some holes in the wood structure.
After a LONG PAUSE I´m back.
Now I´m working on the nose, using depron slices glued and sanded.
Almost get the right shape, but need yet some trim.
Glad to see you back the $30.00 contra motor as recomended by Pmullen, with a 4 cell lipo will make your plane leap off the grass, you can always throttle down after take off, but for take off, you will have more than enough power with a 4 cell lipo, and i think you will need the weight of a 4 cell in the nose to help balance the planes CG because the motors is in the back of the plane, just my 2 cents worth Take care and have fun, Chellie
I may be getting Older, But I Refuse to grow Up I am Having to much Fun to Grow Up LOL