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Old Jun 15, 2015, 04:16 PM
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KK4EHM--FPV Mon!
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Quote:
Originally Posted by tolice View Post
Stinger, don't give up.
I had lots of fun with mine before crashing it very seriously.
It survived 3 or 4 crashes before total destroy

Will make another this year, just need some time to start.

Any HK motor suggestions for the normal size Speedy, with a 4S setup?

I made mine with an inrunner great planes motor and it was fine. Now I want one with an outrunner.

I think this 4400 kv is too large, don't? I have onde of these.
https://www.hobbyking.com/hobbyking/...dProduct=11177

Maybe this?
http://www.hobbyking.com/hobbyking/s...idProduct=8137
It runs on 4S

Too heavy?
http://www.hobbyking.com/hobbyking/s...dProduct=21483
The 2nd one listed would be the better choice. The motor I had for 4s that took it to 138 mph was 65 grams but they no longer sell it now.
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Old Jun 18, 2015, 05:41 PM
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I'm trying not to give up. That 4th attempt broke my only 4x4 prop, and I've honestly been put off by the whole project. I'm sure its a great flying plane but I just can't figure it out. I may have to get on hobbyking and order a crap ton of cheapo 4x prop's. Somehow though, I always seem to have this problem with smaller planes. I scaled down a pusher prop f-18 a few years ago that ended up about the same size as the speedy. And for the life of me, attempt after attempt after attempt I could never get it to fly. I'd love to write it off to a newbie mistake, but I've flown for years so I can't. Just never have good luck with smaller planes for some reason.
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Old Jun 19, 2015, 12:40 PM
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Think smaller, AND FASTER, much faster
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Old Jun 19, 2015, 03:09 PM
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I had the same roll to the left problem with both of mine. I had put such small throws on the plane because of the speed that I was left with not enough to counter the torque roll. I then upped my deflections and found that I needed a boat load of right aileron to get it flying straight. I have probably about .150 to .200" of deflection with subtrim just to counter the torque. I also needed quite a lot of up elevator. My cg is per the plan, and with these changes it flies great, very smooth. Btw, I have a 4400kv running 3s on a 4.5x4.5 prop, and it screams. I also made a full airfoiled wing, but very thin- only about .320" at thickest point. I'll put some pics up tonight...
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Old Nov 30, 2015, 08:17 AM
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3D printed Speedy

Hi all,

I was just wondering if someone had already printed this bird with a 3D filament printer ? I've already built one in "6mm foam", I must say it flies very well.

Here where my modeling is so far.
I don't know if this could fly, may be printed with PLA (light & strong).

Question : should I also apply NACA symetric profile on the stabilizator surface ? Thanks
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Old Nov 30, 2015, 08:28 AM
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KK4EHM--FPV Mon!
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Quote:
Originally Posted by Lnk47 View Post
Hi all,

I was just wondering if someone had already printed this bird with a 3D filament printer ? I've already built one in "6mm foam", I must say it flies very well.

Here where my modeling is so far.
I don't know if this could fly, may be printed with PLA (light & strong).

Question : should I also apply NACA symetric profile on the stabilizator surface ? Thanks
I'd love to see a 3d printed version of the Speedy actually fly.
I'm pretty sure you would be the first.
I think to get one to fly you will need to scale it up because the wing loading is going to be very high. Using a symmetrical NACA on the stab seems like a good idea.

If you get one to fly I hope you'll send me the .stl's so I can print one too.
Looking forward to your progress.
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Old Nov 30, 2015, 08:35 AM
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from France
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Hi 3DMON, thanks you again for this awesome design !

For sure I will share the STL's.
PLA material is quite light IMAO https://3dlabprint.com/index.php; of course wing-loading will depend on how the surfaces are extruded to make solids. (thickness)

Will work on the project, keep in touch
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Old Nov 30, 2015, 10:42 AM
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Reap the wild wind
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Here's one but a bit larger than the Speedy
https://www.youtube.com/watch?list=P...&v=KJ9iG-FnP0Q
Andy
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Old Dec 10, 2015, 01:36 PM
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Sorry guys, bad news here ... the problem is the weight with PLA filament.

I've made some conversions, my airframe would be more than 1kg without electronics !

This is because I have a 3D Printer which can print 1.75mm filament.

I'm pretty sure that with a smaller extruder, I could get thiner layers and less weight.

Here is the Rhino3D attached.
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Old Dec 10, 2015, 04:51 PM
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KK4EHM--FPV Mon!
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So what size nozzle are you using right now? I would think a .4mm would do ok.
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Old Dec 11, 2015, 03:29 AM
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My 3d printer has 0.4mm nozzle : http://www.sharebot.it/index.php/sha...ation/?lang=en

Even printed in PLA, the expected weight of the naked airframe (no electronics) is expected to be more than 900 grs~1000 grs which is a bit heavy
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Old Dec 11, 2015, 06:24 AM
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KK4EHM--FPV Mon!
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Yeah, I think the only way to make it happen with the Speedy is to scale it up then.
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Old Dec 11, 2015, 01:22 PM
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I don't actually know how much it will be necessary to scale it up.. May be 120% from the original ?

I've made some tweaks, with a sample full fuselage part (test), of 1.3mm thickness.
(actually don't know if this PLA thnickness could be strong enough)

My 3D printer software gives always positive values of + ~10%.

This is a bit more encouraging at 160grs.
I also expect to make some parts in foam (stab & rudder) not to give extra weight to the tail.
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Old Dec 11, 2015, 06:11 PM
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KK4EHM--FPV Mon!
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United States, FL, Sebastian
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Quote:
Originally Posted by Lnk47 View Post
I don't actually know how much it will be necessary to scale it up.. May be 120% from the original ?

I've made some tweaks, with a sample full fuselage part (test), of 1.3mm thickness.
(actually don't know if this PLA thnickness could be strong enough)

My 3D printer software gives always positive values of + ~10%.

This is a bit more encouraging at 160grs.
I also expect to make some parts in foam (stab & rudder) not to give extra weight to the tail.
1.3mm thick is probably why it's coming out so heavy. I made a 3d printed fuse for a different design some time ago and I did a double layer wall for a .8mm thickness. Strategic placement of a cross brace made in plenty strong.
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