building airfoiled wings ?

[Daniel Z]

ok, I have been looking for a method to build airfoiled wings with foam, and want to know about your experiences and building methods to do it right.

Daniel

[Mister UHU]

"3d Crazy" has done a pretty good job with some of his planes.

You could do worse than learn from him.

[rapghsi]

Ireally want to find a manual or a movie how to make well build airflows.
i know that F3P airflows are little smaller, for better stabilizing and more speed.
i will try soon to make one from epp 4 mm and 6mm sheets.
i am hoping to able to build one without the need of carbon reinforcement's.
some one can help me find information like that?
thanks alot.

[Aio_1]

Ireally want to find a manual or a movie how to make well build airflows.
i know that F3P airflows are little smaller, for better stabilizing and more speed.
i will try soon to make one from epp 4 mm and 6mm sheets.
i am hoping to able to build one without the need of carbon reinforcement's.
some one can help me find information like that?
thanks alot.
Do you mean aerofoils/airfoils when you say airflows?
Generally F3P planes use flat plate but this is primarily for light weight and ease of building rather than speed. Generally less speed and a fairly constant flying speed is preferred so low drag is not desirable and airbrakes are often added if the airframe doesn't provide enough drag. The sharp leading edge of the flat plate does effect stall angle of attack and may make stalled flight more stable (harriers etc) but I'm not sure how much difference it makes. A full aerofoil should make normal pattern type flying smoother but might harm spins and stalled flight.

Aidan

[Daniel Z]

i will try this stuff used to "stabilize" floors in construction to make the skin, it is very flexible so I`m thinking in epp ribs, I`m imagin a very rounded fuse too...

will post my advances

any advices?

[rapghsi]

yea i actually have this material to, its similar to epp but more flex and heavier, i prefer epp, epp glowes better to.
it might work, in additional of epp reinforcements it be very weak and will need carbon reinforcements.
did you build somthing with this meterial before?
i use only epp and depron.

[Aio_1]

I don't think that foam has any useful rigidity. EPP is quite flexible but has enough rigidity to be used as a structural material but I don't think the floor underlay foam has any rigidity at all. If I remember correctly it's easy to compress and stretch too. I expect the reinforcement required will essentially make it a built up plane in which case you'd do better to simply go the whole way and cover it in iron-on film/mylar/tissue or similar.

Aidan

[3d_Crazy]

i will try this stuff used to "stabilize" floors in construction to make the skin, it is very flexible so I`m thinking in epp ribs, I`m imagin a very rounded fuse too...

will post my advances

any advices?

That brings back some memories... Before I got my hands on EPP (almost 3 years ago), I built a plane out of that stuff (but the blue color). It's probably the ugliest plane i've ever built!

http://www.rcgroups.com/forums/showpost.php?p=1501716&postcount=323
http://www.rcgroups.com/forums/showpost.php?p=1501748&postcount=327
http://www.rcgroups.com/forums/showpost.php?p=1501759&postcount=328
http://www.rcgroups.com/forums/showpost.php?p=1501771&postcount=330

[rapghsi]

Yea we can see that you used alot of ductape,allot amount of ductape weights allot.
i can see that the material is very weak, and the airfoils is not so precised.
i don't think you can make plane with that material better then "3d_Crazy" make.
if you want to make something that does fly well build it from materials that every one use, epp depron etc...
the only material i have found that you can buy it not in hobby shops,and able to build a well flying plane with it is styrofoam.

[Daniel Z]

well, I think you are right, maybe it is not the best material, I have estimated a wing for about 30gms, and I can make it better out of balsa...

[philosophicle_1]

Looks like the newer UCanDo3D to me, if any of you've seen that yet. The guy at my LHS pulled it out of the box and bent it in half to show me. My first thought was "Great, I can crash it!", which quickly lead to, "but where's the rigidity to pull out of a steep crash (or turn or axial or whatever) without bending in half. It looks like a great idea for a trainer, but I personally don't see much potential in having a crisp, sharp handling competitor out of it.

BUT PLEASE, prove me wrong. The world is made up of all too many neigh-sayers and not enough dreamers to prove them wrong. I like those who think outside the box, that's how we grow. After all, I was amazed when I saw my first mini IFO fly. Imagine that, and RC sheet of paper!
-J.Mc.-