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Old Feb 12, 2011, 10:13 AM
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18in Viperwing tailless flying wing with AR6400 and retractable gear! Video!

I've had it flying for a while, but just now decided to share it. This is an 18in Viperwing, the smallest ARF tailless flying wing in the world! I set this one up with an AR6400L, a Parkzone Sukhoi motor, a Zippy 240mah lipo, and retractable landing gear, actuated by a HobbyKing 2.5g servo. It weighs 35g and produces roughly 25g of thrust with a 2.25in prop. Because this wing has no vertical surfaces, drag is exceptionally low, allowing superb performance, even with an underpowered system. It will cruise around at just over half throttle, climb surprisingly well, and glide well too. It is capable of performing a variety of basic aerobatics. The top speed, according to my well trained eye, is around 30ish. Flight time has not been timed yet, but seems to be around 10-15min. If you want to see this thing fly in person, I'll be bringing it to Iowa in a week (http://www.expodome.org/). You can buy one for yourself too! I'll have pre-built airframes available (no landing gear) that just require electronics.
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Last edited by all4smallrc; Feb 22, 2011 at 04:50 PM.
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Old Feb 12, 2011, 10:42 AM
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Southlake, TX
Joined Jan 2008
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Looks great and I love the Retracts.

What Motor/Prop are you running. Is that a 8.4mm Sukhoi motor?

I'm looking for good 2.25 props.
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Old Feb 12, 2011, 10:58 AM
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Yep, 8.4mm Sukhoi motor. The prop is a BP 2.25in prop (http://bsdmicrorc.com/index.php?productID=662). I've been very happy with this setup.
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Old Feb 12, 2011, 11:05 AM
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Have you ever tried a Tri-Turbo with these motors?
TODD
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Old Feb 12, 2011, 12:34 PM
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I don't like how fragile they are, but I suppose I should try it with one.
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Old Feb 22, 2011, 04:50 PM
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While in Iowa, I decided to try the Tri-Turbo prop. It had much more power, but flight times lacked a bit due to more amps being drawn. I could still fly for about 8-10 minutes though. Here is a video of the Viperwing demonstration I did during the air show on Sunday.
Viperwing demonstration (0 min 50 sec)
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Old Feb 22, 2011, 05:00 PM
Gary
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Joined Dec 2009
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Can we see the details on your retracts?
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Old Feb 22, 2011, 05:09 PM
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It's really pretty simple. It's just modified Sukhoi landing gear that is hinged on the foam with small heat shrink tube. Stainless steel wires link the gear to the servo. Simple as that. The hard part was getting the front and rear landing gear to travel the right amount in proportion to each other. It was just a matter of changing the length of the wire for the front gear in relation to the hinge point though.
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Old Feb 22, 2011, 06:57 PM
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Looks great SMALL, glad the Tri-Turbo worked out. I wouldn't call a 8-10 min flight lacking. Also looks like it slows down nice. If you get a brighter video please post it.
TODD
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Old Feb 22, 2011, 08:37 PM
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It does slow down nice. The wing loading is much lighter than most of the Parkzone models. For having as much wing sweep as it does, it sure has a massive speed range. And surprisingly, even when you slow down a lot, you don't have to pull up very much to compensate the cg shift. At first, I was kind of disappointed with how dark the video turned out too (it was cloudy outside, and they had the lights off). Now though, I think it is better this way. The Wing still shows up well, so it is much easier to see than it would be if the background was brighter.
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Old Feb 26, 2011, 09:00 AM
slow but inefficient
Ron Williams's Avatar
Riverhead NY USA
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Quote:
Originally Posted by all4smallrc View Post
It's really pretty simple. It's just modified Sukhoi landing gear that is hinged on the foam with small heat shrink tube. Stainless steel wires link the gear to the servo. Simple as that. The hard part was getting the front and rear landing gear to travel the right amount in proportion to each other. It was just a matter of changing the length of the wire for the front gear in relation to the hinge point though.
That's kind of a thin description when you could post a couple of pictures of the underside of the wing with no more difficulty than the first two pics you posted. The whole project is really neat.
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Old Feb 26, 2011, 09:16 AM
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Uh, yeah, about that. I kinda broke the landing gear off in Iowa. That's why I caught it in the vid. I tried landing coming right out of a turn and one wheel touched down before the other one, causing it to rotate sideways. Then the other wheel caught the high grip floor and snapped the gear. I don't have any spare Sukhoi landing gear to replace it with.
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Old Mar 14, 2013, 07:21 PM
Life begins at 40
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wow! how much for kits?
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Old Mar 14, 2013, 08:02 PM
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Elmhurst, NY (Queens in NYC)
Joined Apr 2004
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Except for scale I tend to fly micros without landing gear anyway. Grass is unkind to LG and I hate looking like I crashed even when I've done a good landing.

Pete
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Old Mar 15, 2013, 12:26 PM
Founder of the EDF20 club!
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Minnesota
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Quote:
Originally Posted by addictedtoplanes View Post
wow! how much for kits?
Due to RCGroups rules, I probably should not talk business here. Send me an email at orders@all4smallrc.com and I will get back to you. Thanks!
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