View Full Version : LAheli Y-UFO
Test flight of Y-UFO video.
04-13-2008, 11:44 PM
That was neet, Something different anyway :) take care, Chellie
04-14-2008, 12:58 AM
interesting, seems like a real handful!! how does the rudder axis work on it?
04-14-2008, 01:30 AM
I'm scared!! ( theres little gray guy's inside!! ) your bub, steve
04-14-2008, 03:38 AM
Thanks Kosh, I recompressed and put up the video you took and uploaded it to my site (just wanted to get the size down in line with my other video indoors).
http://www.nwheli.com/HeliVids/LAheli_Y-ufo/Kai's_Y-UFO_outdoors.wmv (Outdoor vid, 3min 35sec, 24.8MB)
http://www.nwheli.com/HeliVids/LAheli_Y-ufo/Kai's_Y-UFO_Indoors_4-3-08.wmv (Indoor vid, 4min, 28.2MB)
Yaniel, the rudder axis on the Y-ufo works by rotating the boom it's on (the boom goes into 2 bearings inside the main frame and is tied to a servo for angle adjustment). I put a Futaba GY240 on the tail control axis of mine (because I had one laying around and I like how drift free it is), it comes stock with a rate gyro.
It's actually quite easy for anyone with FP/CP heli experience to fly, it wobbles a little in certain flight regimes, but when kicked up in speed it smooths out and handles great. I fly to the average of the wobble with it in hover (I have the "cyclic" gyro gain turned down and travel turned up so that mine is more maneuverable than most), I have found that it has some ground effect interactions in flight at low altitude with high lateral speed (the front props can cause ground effect boost to the tail prop making it want to nose into the ground), just flying a little higher avoids that.
I bought it from http://www.gothelirc.com, the manufacturer's site is http://www.laheli.com
Even with those long booms, it's surprisingly strong, I've now crashed it 4 times, and the most expensive crash was around $20 (and that was a user error of not tightening the motors enough and having one come off at over 120ft up, broke one boom a servo gearset and 1.5 props)
I might also add the winds were from 8 to 12 mph at the time and its heard on the camera along with my constant zooming clicks.
04-16-2008, 05:53 AM
Forgot to mention here, that I'm going to try some loops and rolls with it next time I'm able to fly over grass ::o. I had a loss of orientation crash indoors and accidentally rolled it to inverted just before impact (in less than 5ft of altitude), so I figure I'll try a roll first at altitude and see if I can recover in time, LOL. If that and the loop goes well, then I'm going to try some falling flips as well (forward flips should work better as the rear prop has good leverage on the CG).
Done right, even though the Y has no negative pitch capability (fixed pitch) it shouldn't be all that much different than looping a slowstick (ie, they will be sort of lopsided loops/rolls and have some loss of altitude). The primary issue will be orientation/re-orientation coming out. Might have to try to get the success or failure of the initial attempts on video :<:.
Wind handling wise, I don't think I'll fly it in anything past 15mph winds (that's what I have CP helis for, LOL), but I will say that the wind limits are pretty similar to my profile eFlite Extra 260 (it's just a pain in anything over about 10-12mph wind, still flyable, just not enjoyable :silly:)
I ordered new props already, so they'll be here in the next few days (ie, just in time for the crummy weather predicted for this weekend, DOH).
04-16-2008, 06:47 AM
Nice! Looks like fun AND a lot less parts than my T-rex 450SE V2!!!
04-18-2008, 03:26 AM
Kosh, you'll laugh about this, that last crash I had broke 1.5 props again, and one wire (fixed it in about 7 minutes tonight once my new props arrived, LOL).
Thats great to hear its all fixed again, I like the idea that even in the field most crashes are under 10 minutes to fix it.
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