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Old May 11, 2014, 08:25 AM
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Mini-HowTo
Build your own Flytrap $17 Acrobatic Slope Wing

The FLYTRAP 48" Acrobat/ Uber cheap Combat Wing
Thanks for dropping in. I'm so excited about this wing that I have to share it. It's been like 7 years now since the Revert, swifter and KF48 Kline Fogleman foiled wing plans were done. It's taken this long to get it right. I wanted to make sure all the KF possibilities were tried before giving up. The KF stepped wings made from flat foam have been known to be a little "draggy" for slope applications. This had to be changed. So with a little outside of the box thinking and a bit of luck, I crossed my fingers and gave it one more shot.

And here she is! The FLYTRAP. Apply named because once you fly it, it'll suck you in. I'm calling this airfoil the KFH (Kline Fogleman Hybrid). This should help bring the concept into a new light at least for anyone wanting to build an uber cheap, fully acrobatic slope wing. Put in some Turnigy 9g metal gear servos and you have a $20 combat machine!

This version of the Flytrap is made from FFF fan fold blue foam. Depron and dollar tree foam will work too and probably look much nicer.

The first video is of the "secret" build technique to making the foil fly.

The second video shows the very first maiden flight with winds blowing to north (normally not the ideal conditions for sloping) and yet the Flytrap is working great right outa the box, so to speak. I tried to keep the flying in close since we shot it on the iPhone.. . Wait till you see the videos of JGAF, quadshot, ray nemovia and rich gorsuch flying it. She made the rounds all day and no one wanted to put her down... But first, the costs;
How much do I need to fork out to build this ugly Betty?

So total cost to build the flytrap?
Fan fold foam = $2
9gram servos (2) = $5
Zip tie horns (2) = almost free
Carbon/ metal linkages = $0.50
Hot glue = pennies
LiFe 700 Rx pack = $2.58
HK orange Rx = $7
Razor blade = near "0"
Cool paint scheme = priceless!

And the tools? What high end equipment will it take to put one together.
-razor blade
-hot glue gun set to low
-ruler
-mono coat iron (any wing builder should already have one these)
-some packing or strapping tape
-optional blen derm for covering spar and hinging elevens (packing tape works too)
-high end marking device like those used for writing on paper.
-some kind of poker (that's what she said, ha) to make a hole in your zip tie control horn.

SPECS;
- 48" wingspan
- 3" elevens
- 15" root chord
- 6" tip chord
- 15" sweep from nose
- 50% step with control surfaces included
- root step length is 9"
- tip step is 4.5"
- CG = 9.375 from nose
- zip tie control horns
- wire and carbon linkages
- chord thickness 1/2" at step
- AUW as flown about 8oz
- wing area approx 630 sq in

Original plans are in the second post, courtesy of Ken
There are 36" and 24" flytrap plans in the pics below.
(use 3mm depron for the 24" with target AUW of about 3oz)

Bonus traits to the flytrap;
-no tip stall
-no death spiral
-no washout in wing tips needed
-no hotwire cutting
-no monokote needed
-no new stuff required
-no spar needed!
-easy to fly as a trainer too
-VERY ACROBATIC
-INCREDIBLE INVERTED FLIGHT

Negative traits to the flytrap;
- she ain't the prettiest
- your friends might be mad at how much you paid for it
- girls won't be flocking over to say hi

Tips;
-no expo needed
-throws 100% or 125 if using computer radio

Airfoil how to;
How To Make a Sharp Leading Edge in Flat Foam for RC Planes (1 min 58 sec)


Maiden flight, first launch;
The Flytrap RC Glider Acrobatic Slope Wing teaser (0 min 51 sec)


JGAF first flight;
Flytrap RC wing first flight by JGAF (2 min 50 sec)


FLYTRAP LITE COMBAT
Flytrap scratch built flat foam RC glider combat (1 min 16 sec)


LITE WIND FLYTRAP WING FLYING
Lite Wind Flytrap Scratch built RC Flying Wings (1 min 22 sec)


[B]FLYTRAP COMBAT[?B]
FLYTRAP and KATO RC Glider Wing Combat (4 min 16 sec)


Leadfeather's 36" Flytrap MULTI-FLIPS
Flipflap'n Flytrap'n (3 min 14 sec)


VIDEO BY QUADSHOT;
Troy's flat foam glider (0 min 49 sec)


Special thanks to Tony65x65, Viking60, jackerbes, gold guy, gpw, JGAF, kbstingwing, vtdiy, dz1sfb, Dickeroo (Dick Kline) of course, and anyone else that I may have stole ideas from to make this wing a reality. Thanks for all your inspirations and thanks to the rest of you here on RC groups that have given so many great ideas away to those of us in need! Special thanks to Ray Nemovi and Rich Gorsuch for the handy iphone work.
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Last edited by tiretrax; Jul 09, 2014 at 11:24 AM.
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Old May 11, 2014, 09:31 AM
dz1sfb is offline
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How much distance from the centerline to the aileron root? Looks to be about 3.5".

Ken

I took some liberties by interpolation.

Plan update with CG and a few odd dimensions corrected.
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Last edited by dz1sfb; May 12, 2014 at 06:04 PM. Reason: plan updated
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Old May 11, 2014, 09:58 AM
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Wing area checks to 630.7855 sq. in.

Ken
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Old May 11, 2014, 10:03 AM
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Pretty awesome! I like it! Congratulations!

Looks light. Curious how much it weighs?
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Old May 11, 2014, 12:24 PM
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flyin' fool
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Looks like a winner. Add weed whacker line to the LE for combat.
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Old May 11, 2014, 12:35 PM
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I flew it for a couple hours yesterday. Best foam board slope wing out there.
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Old May 11, 2014, 02:07 PM
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Slope Nutz, FLY OR DIE
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that's a nice foam board wing Troy, looks like a lot of fun.
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Old May 11, 2014, 02:20 PM
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Troy...

The Revert was terrific. The Swifter even better. But the FlyTrap takes a step up to a whole new level. And your approach to making a sharper leading edge is brilliant thinking.

~ Dick
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Old May 11, 2014, 05:33 PM
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Got a Flytrap scratched out today if you could call it that. Maybe more like my interpretation.

AUW with a 750 mAh 2s battery is 250g as pictured.

Ken
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Old May 11, 2014, 06:12 PM
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Wow I step out for a few hours and you guys go crazy.

Thanks Fred, goldguy, Kevin, Dick and Justin.
Justin- would you mind if I posted some footage of you flying this thing? You really had some impressive lines and brought it to life.

Ken, holy schnikies you really knocked that out fast. Thanks so much for posting the drawing. The elevons are 3" so that makes the root chord 18" and the step chord ends up at 9" and tip step chord is 4.5". I was a little concerned at first since my best results thus far where at 40% but 50 is the magic number. Any further back and the step might start to interfere with the control surfaces.

One important thing is the CG. It's perfect at 9-3/8" (9.3875) to maybe 9.5"

I cut the battery hole through both plies and hot glued a small piece of 2mm coroplast on the bottom to lower the battery. I needed the nose weight anyway so this balanced it perfectly.

Goldguy - weed wackier line on the LE would be the ticket.

Ken - Your build is so nice in white. It looks like you nailed it and I'm sure this can be tweaked a lot of directions and still work well.

I have to say so far that I have flown most of the wings that have been made to date and by far my all time favorite is the kato. The kato light is absolutely incredible even though it's built very light with small servos, they can't be easily knocked out of the sky. Their recovery is incredible and for combat, that to me is truly the most important trait. And there is no better inverted flying wing out there. Hats off to Kevin for that design and to Justin's build techniques for creating a truly acrobatic wing.

The Flytrap lfills in yet another gap with ease of build and price. It's getting really hard to get wing cores these days and this might help to keep the flying wing going strong.

So enough of my ridiculously long posts.
Ken - send me a close up of your LE. I will try to get a few more photos added today. Working off the iPad and I feel a little handicapped
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Old May 11, 2014, 06:20 PM
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Quote:
Originally Posted by dz1sfb View Post
How much distance from the centerline to the aileron root? Looks to be about 3.5".

Ken

I took some liberties by interpolation.
Spot on Ken, this the official plan. I wouldn't change a thing. Now I don't have to open autocad, YES!!!

And the distance from the centerline is exactly 3.5. Man you got some skillz.
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Old May 11, 2014, 06:40 PM
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Go for it just play some cool music with it
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Old May 11, 2014, 06:48 PM
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Hmm that's the hard part, there's no cool music that's free anymore. But I got a pretty good clip of you that almost is better with a little background chatter than some royalty free techno

I'm gonna post it. I can ad music later if it sux. Haha.
T
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Old May 11, 2014, 07:10 PM
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Quote:
Originally Posted by tiretrax View Post
Ken - send me a close up of your LE. I will try to get a few more photos added today. Working off the iPad and I feel a little handicapped
Here is what I believe you're looking for. I used the video you posted of construction as a guide to the airfoil. Beveled the inside edges of the leading edges back .5". Taped and pulled over. Used hot glue on all edges. Pressed the tips flat together. This was done to get a more consistent airfoil from left to right.

Ken
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Old May 11, 2014, 07:13 PM
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Ken that is beautiful. Better than mine for sure. It should fly even better. Check out the second video I just added to first post of Justin bangin sticks
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