Ryan O.
Out of Foam Board!
My guess would be slow, and not well when the throttle is punched. Luckily I'll be shortening the extension by the next one.I really like that plane! I'm interested in seeing how it flies
My guess would be slow, and not well when the throttle is punched. Luckily I'll be shortening the extension by the next one.I really like that plane! I'm interested in seeing how it flies
But to make a U2 70mm its gotta have a LARGE spanIt's a 70mm in basically a big sailplane, can't get much more efficient than that
That's the problem with most RC planes based off millitary jets, especially the older turbojets, like on the Hustler. They have really skinny and long engines, which isn't what you wany for EDFs, so with those types of aircraft I almost always see 12 blade 6s fans to generate as much thrust as possible. It may be worth making a slightly larger than scale fuselage to allow for a larger fan, that way your thrust to weight ratio is better, which is good incase you plan on faster flying, or just to get out a a tricky situation.But to make a U2 70mm its gotta have a LARGE span
Yeah but 6s power density is so much nicer but yes I agree a slightly off scale fuse wouldn’t end the cool factorThat's the problem with most RC planes based off millitary jets, especially the older turbojets, like on the Hustler. They have really skinny and long engines, which isn't what you wany for EDFs, so with those types of aircraft I almost always see 12 blade 6s fans to generate as much thrust as possible. It may be worth making a slightly larger than scale fuselage to allow for a larger fan, that way your thrust to weight ratio is better, which is good incase you plan on faster flying, or just to get out a a tricky situation.
That's one thing I'm still trying to figure out. Really old vintage models would often be built with the wing high up on that extension/pedestal. I don't remember ever seeing a full-size plane looking like that. The only thing I can think of is that it's for stability. I mean - they started with free-flight models, then an incredibly primitive radio controlled rudder...My guess would be slow, and not well when the throttle is punched. Luckily I'll be shortening the extension by the next one.
1 to quote Cessna, “High wing stability ask any bird”That's one thing I'm still trying to figure out. Really old vintage models would often be built with the wing high up on that extension/pedestal. I don't remember ever seeing a full-size plane looking like that. The only thing I can think of is that it's for stability. I mean - they started with free-flight models, then an incredibly primitive radio controlled rudder...
The other thing I'm still figuring out is why they often gave the wing a couple degrees upward angle of attack, but it must be something to do with such a high wing, and similar to how we give the thrust axis a bit of downward angle.
Sure, I'm with you 100%.1 to quote Cessna, “High wing stability ask any bird”
2 yes a high wing is more stable, fight me on it 😂
3 the positive angle of attack in the wing is so that free flight models would naturally gain altitude with thrust but its a pretty good practice for RC trainer/slow flight models too.
I mean, wing pylons are a thing that exists on full scale aircraft. As far as models are concerned, a pylon is a way to raise the wing without the drag or complexity of a bunch of tiny struts. Also, it moves the wing away from the fuselage, minimizing interference drag.That's one thing I'm still trying to figure out. Really old vintage models would often be built with the wing high up on that extension/pedestal. I don't remember ever seeing a full-size plane looking like that. The only thing I can think of is that it's for stability. I mean - they started with free-flight models, then an incredibly primitive radio controlled rudder...
The other thing I'm still figuring out is why they often gave the wing a couple degrees upward angle of attack, but it must be something to do with such a high wing, and similar to how we give the thrust axis a bit of downward angle.
But to make a U2 70mm its gotta have a LARGE span
It'll have a 6' wingspan, making the fuselage a solid 3" diameter or so. I did all the math months ago, this is an older project that I'm reviving. I build a lot of gliders in the same size range, my heaviest tops out at 480g and most of that is the battery. At this point I think a larger than scale fuse will just be extra weight without increased wing area, meaning heavier wing loading. A 70mm on 4s shouldn't have any problem keeping this thing up especially since I'm not planning on flying fast, just scale soaring around the park.That's the problem with most RC planes based off millitary jets, especially the older turbojets, like on the Hustler. They have really skinny and long engines, which isn't what you wany for EDFs, so with those types of aircraft I almost always see 12 blade 6s fans to generate as much thrust as possible. It may be worth making a slightly larger than scale fuselage to allow for a larger fan, that way your thrust to weight ratio is better, which is good incase you plan on faster flying, or just to get out a a tricky situation.
I may 3d print a 2 stroke glow dummy engine, just like the guy who made the original Queen Bee did. Unfortunately the high mounted wing was just a little too stable, so it'll be shortened a little.@Ryan O. - I like the high wing....looks great as a vintage plane and definitely meets the challenge criteria. Very original approach. It would be great if you could make it work. Look great with one of these
https://willynillies.com/shop/ols/products/cox-td-020-motor-mount-for-1306-motors
sadly i wont be going to flite fest '21, i live in Portland OR. but if your willing to send them my way ill give you my po box.If youre coming to flite fest ‘21 seek us out. Ill give you some of my spare stuff and maybe my friends will follow suit.
Lolsadly i wont be going to flite fest '21, i live in Portland OR. but if your willing to send them my way ill give you my po box.
Orrrrr put a real glow engine on it?I may 3d print a 2 stroke glow dummy engine, just like the guy who made the original Queen Bee did. Unfortunately the high mounted wing was just a little too stable, so it'll be shortened a little.
Kinda surprised this thread is still alive 😂Alrighty guys, the plans are done! As soon as I get my needle cutter up and running I’ll cut out another one and make a build video.
https://forum.flitetest.com/index.php?resources/f7f-tigercat.192/