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        Discussion Yoda - Ultrabatics - perform them, this will...

#1 Rhys Porter May 22, 2012 07:02 PM

Yoda - Ultrabatics - perform them, this will...
4 Attachment(s)
Alright guys, i've been hinting for ages over on the VTPR Facebook group that i've been working on a lightweight glider that is capable of performing a rudder flip, as well as all the other ultrabatic stuff.

As far as i know the only other glider out there that will do it is the Aero-Glide that Steve and Michael built over in Cali, and I wanted in on the action!!!! What I was looking for, was a smaller sloper that could do all the VTPR and ultrabatics stuff, that looked a little unique. Then someone mentioned that with the tail config the way it was on the Aero-Glide, it could be discus launched. I ran with that idea and have a launching peg installed so I can DL it (in super light conditions) on the slope.

Now it could possible be built lighter with EPP and covering film, as well as some lighter servo's and a swiss cheesed wing... But i wanted to use what I had, and that was blue foam, carbon and fiberglass. Plus 2x HXT500's, 2x HXT900's, a AAA 4cell pack and an orange Futaba reciever.

She came out at 258g ready to fly. That gives me a wing loading of around 6.5oz/sq.ft, or 20g/sw.dm. I'm pretty happy with that, and hope that it holds up to the usual VTPR slope abuse. One thing I added in this which wasn't in my 40" Le Fish, was a 2.5mm carbon rod down the entire LE of the wing to provide impact resistance. The old wind was totally dinged up, where as this can be whacked on anything and the LE remains clean.

Why the name? Well, what's little, extremely agile and pretty weird looking? Yoda of course! I found the tail shape I designed looks very similar Yoda's ear, and it suits the way it flies.

There's a short video below of some test glides in the park. I have full length flapperons mixed in like a DLG so I can really slow it down for landing, i'm using them in the video to hand catch it...

There's plans attached for anyone interested. Feel free to make one, change it, fix it, redistribute it or whatever you want. It's very loosely based on the original Le Fish plans, so credit goes to Steve Lange for the idea - and in particular the work he's done with Michael Richter from Dreamflight on the Aero-Glide.

Yoda - Ultrabatics Glider (0 min 41 sec)

#2 surfimp May 22, 2012 07:20 PM



Love this.

Subscribed I am.


#3 MATIN May 22, 2012 07:30 PM

Pay to George royalties you will.......Hmmmm....

#4 Rhys Porter May 22, 2012 08:09 PM

Haha if Lucas Film comes after me for royalties i'll be totally stoked that they've taken interest in slope soaring.

Wind's forecast 5-6 knots NE this arvo, should get 15mins of testing in before it gets dark!!!!!!

#5 george@dream-flight May 22, 2012 08:48 PM

Right on Rhys!

#6 Snewk May 22, 2012 09:07 PM

Nice Stuff there, Rhys. Looking forward to the slope videos.


#7 16141 May 22, 2012 09:24 PM

:D Show me more. the buiild,mechanics of tail feathers,layouts of sevos etc:cool:
Bugger that show me every thing:D:D
Slope video please:popcorn:

#8 Rhys Porter May 22, 2012 09:42 PM

Lol - It ain't pretty! Will take some detailed pics once I know it flies as desired... Currently using a normal pull/pull system with lines running inside the tail boom. If they break i'm stuffed, so fingers crossed it doesn't!!!!!

#9 robh May 22, 2012 11:46 PM

Awesome stuff Rhys! I've often thought that a lightened DLG of sorts would be a good contender for this type of flying, and, well, you've basically proven the concept! Nice.

I've got a "LapDancer" (interesting name?!) from Denny at Polecat Aeroplane Works which, although it has a spinny thing on the front, slopes extremely well due to its roots in the DLG world. Oh well, all this to say nicely done!


#10 FSD May 23, 2012 01:08 AM

So innovative...love it.


#11 Rhys Porter May 23, 2012 06:17 AM

Well, the wind never came... So the Yoda is still sitting in the back of the golf... Maybe tomorrow.

#12 Snewk May 23, 2012 07:02 AM


Originally Posted by Rhys Porter (Post 21689820)
Well, the wind never came... So the Yoda is still sitting in the back of the golf... Maybe tomorrow.

Sloping's version of Field of Dreams:

"If you build it......the Wind won't come!"


#13 surfimp May 23, 2012 08:37 AM

Rhys have you tried a true DLG launch yet?

Will be interesting to see what we need to do to get the rudders solid enough on these models to permit that.


#14 Rhys Porter May 23, 2012 05:03 PM

I did one at half power and it was ok - it was quite yawy, but I didn't have a rudder pre-set like I usually do on my DLG. There was a whistle as I went around but I think that was either the pull/pull lines or the gaps in the ailerons (remember it's glass).

The Rudder only goes through about 120 degrees ,and the pull pull lines are crazy tight. The servo arms on the HXT900 are actually bending under the load haha. So I think it'll be ok for a full on DLG launch, I just need the balls to do it!!

It could also be my throw, as I haven't put the DLG peg in the wing yet, so I was jut pinching it and throwing Alula style.

#15 FSD May 23, 2012 05:34 PM

You were speaking of a pull-pull system for the rudder...Here is another option (called direct drive) that I was working on six months ago to achieve extreme rudder in my attempts to perform what I call a vertical flatspin or what you all call a rudder flip. Just sharing ideas...hope you don't mind.


Continued Work On Extreme Rudder (1 min 5 sec)

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