badpilot27
Active member
heres the onshape document if you want to see where I did wrong https://cad.onshape.com/documents/2...91139cdb2fefa38016/e/5817367c0d3e79694a1eb338
Help! rc pancake wing pre-design questions
- Thread starter badpilot27
- Start date
badpilot27
Active member
do you guys have any suggestions on how I should attach the motor pylons securely and symmetrically?
hoping to mount them in this configuration
hoping to mount them in this configuration
badpilot27
Active member
Last edited:
badpilot27
Active member
badpilot27
Active member
should i try doing a circular nacelle or a square one
Mr Man
Mr SPEED!
That’s more of a personal preference imo. But I like circular since it’s more scale 👍
telnar1236
Master member
If you can add a bit of reflex into the airfoil it will make your life a lot easier - the Clark Y airfoil like most flat bottom airfoils has a pretty strong nose down moment inherent to it, so you might need a good bit of extra up trim without that reflex in the main airfoil.
Overall, looking good, the Flying Flapjack has always been a favorite of mine
Overall, looking good, the Flying Flapjack has always been a favorite of mine
badpilot27
Active member
kinda just went for the simplest route for the nacelles.
defiantly not the best but who knows maybe they kind of act like wing fences and make a little bit of forward lift to help with the nose down tendency.
also how long should I make the nacelles?
telnar1236
Master member
Probably a bit longer going forwards for CG reasons would be my thinking. At this size, they won't really function like wing fences, but you may be able to use the rotation of the props to do something similar. I'm not too familiar with this kind of design aerodynamics wise, but any wingtip vortex formation will also be impacted by the wing/horizontal tail in the back
badpilot27
Active member
thanks!
also I am planning on using these rc car suspension shocks on the landing gear. Any ideas on what suspension configuration I should use? right now I'm thinking about using a reverse trailing link configuration but I'm not too sure its the best for a stol plane.
telnar1236
Master member
For STOL, something very durable but light. Rubber bands make good springs since they can stretch by a lot and you can put several on to get the intended stiffness
Piotrsko
Legendary member
I dunno @telnar1236 , I like the concept of landing gear sucking up the ugly landings. Stuff I was thinking of has springs, mini shock absorbers and limit stops but just rubberbands has an appeal all its own. Afaik, was popular in the '30s, and my '50 Piper Pacer used them ( yuppa 4 ea expensive aircraft grade cotton covered rubberbands holding the gear down and locked)
Nice work here for a simpler build than the other flying pancake @sponz and @localfiend did. Also a solid start to 3d modeling!
badpilot27
Active member
added a small nose for the battery
badpilot27
Active member
nose made to fit a side ways battery
hopefully will give a bit more lift and will be easier to put the electronics in
badpilot27
Active member
what nose should I build it with?
badpilot27
Active member
so since i didn't have much time earlier to make the designed plane and would need to make a prototype craft this summer to get some experience before i run a club that competes at the suas competition, i decided to make a simplified version that i could build in a quick timeline
the airframe is just one piece of foam board half folded over into a thin kf airfoil which i put the electronics on
did a few hops in the parking lot and its stable, the wing loading does feel a bit high though. but the main gear suspension works great and absorbs alot of force from my not so great landings
the tailwheel however keeps breaking on me and i think its time for a new design
not to sure what to change it to at the moment that is easy to build while being light weight and durable so i would greatly appreciate some suggestions
the airframe is just one piece of foam board half folded over into a thin kf airfoil which i put the electronics on
did a few hops in the parking lot and its stable, the wing loading does feel a bit high though. but the main gear suspension works great and absorbs alot of force from my not so great landings
the tailwheel however keeps breaking on me and i think its time for a new design
not to sure what to change it to at the moment that is easy to build while being light weight and durable so i would greatly appreciate some suggestions
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