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Old Sep 21, 2014, 08:02 PM
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United States, FL, Melbourne Beach
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Seeking a Complete Plan (airfoil, dimensions, washout) for Light Lift Glider Wing

I know what you're thinking "this guy can't use the search!" but all the results are always rough (FFF and tape, etc.), incomplete, or require some improvisation from the builder. Then there are the really nice flying wings (Zupair Z1, Wowings Duck, Bee, etc.) that seem to fly incredibly, but the details are commercial secrets.

I'm looking for a tested, proven wing design with plans that specify the airfoil (with a name and coordinates, not a scan or a sketch), the dimensions of the wing and its control surfaces, and any other considerations like washout.

My environment is a beach with 5-15mph sea breeze and light lift.
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Old Sep 21, 2014, 08:24 PM
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Funny, I just came here for the same purpose
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Old Sep 22, 2014, 12:13 AM
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Finally found one, the "Evo-Zack": http://www.extremflug.de/seite071.htm
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Old Sep 22, 2014, 03:46 AM
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Originally Posted by andrewwl View Post
Finally found one, the "Evo-Zack": http://www.extremflug.de/seite071.htm
Nice one!Have you checked out the slope forum http://www.rcgroups.com/slope-97/
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Old Sep 22, 2014, 12:43 PM
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Seeking a Complete Plan (airfoil, dimensions, washout) for Light Lift Glider Wing
What planform; chevron, forward swept or plank?
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Old Sep 22, 2014, 01:18 PM
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Originally Posted by DT56 View Post
What planform; chevron, forward swept or plank?
chevron
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Old Sep 22, 2014, 01:40 PM
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Originally Posted by Stupot46 View Post
Nice one!Have you checked out the slope forum http://www.rcgroups.com/slope-97/
Yes, I spend too much time reading this forum despite not actually have access to a proper slope. A few of the hot wings right now (Kato, SST, flytrap) have some of the drawbacks I listed above: hand drawn or scanned airfoils, and no specification of washout. Evidently, these designs fly amazingly (love their videos!), but I suspect its due to a few privileges unavailable to me:
  1. a true slope with air blowing vertically, meaning the design needs less focused attention on maintaining lift
  2. frequent flight sessions that allow small issues to be addressed by incremental modifications, so that the plane kind of evolves or converges towards a good flyer, rather than needing to be designed perfectly at the very beginning
Julez's Evo-Zack design really satisfies the request in the original post, and goes further by providing wingtip measurements and recommending servo arm lengths and throws. His flying environment is not the same as mine, but the youtube videos demonstrate Zack's flight on both a slope and on flat land, with the help of a bungee launch.
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Old Oct 13, 2014, 09:09 AM
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Andrew, I don't know how much of a build you want, but if you are still looking for a true chevron wing, I'll post plans for my BreakDancer 62. The Evo-Zack is actually more of a swept delta. A chevron has higher aspect ratio and generally better L/D... like the Z1. (I just ordered one of the blems... a great deal).

The Breakdancer is balsa sheet over foam cores, and can be done with or without power. It meets your requirements... but is more of a build than a combat wing type. Performance, damage resistance and repairs are halfway between molded crunchies and EPP.

ed
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Old Oct 13, 2014, 10:49 PM
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Here are some places where you'll find all sorts of interesting flying wing designs:
http://www.b2streamlines.com/OTW.html
I seem to recall that those "On the Wing" columns have a number of designs with full specs.
--------------
Here are some larger models that might fit the bill if you have room for them and you don't need it to be a foamie:
http://outerzone.co.uk/plan_details.asp?ID=5725
check out the Windlord here:
http://www.skybench.com/index.html?h....com/home.html
Seems like if you're flying on the beach, you might have the room and the nice landing spot required for something like this, though I've seen beaches made of rocks that make great rattling noises when the surf is up! If you look around, you can probably find people who have flown one of these two designs. Here's a mini review of the Windfreak:
http://www.glide.net.au/flyingwing/wfreak.htm
Suggest balanced rudder is unnecessary. If you poke around the site, you'll find a bunch of other flying wing designs.
More flying wing designs:
http://www.aerodesign.de/
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Old Oct 14, 2014, 09:51 AM
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EdSoars: Having an additional model would be great! If it's no trouble, then yes, please post your plans. Also thanks for the clarification on delta vs. chevron.

lincon: Thank you for the links. I don't know how I failed to find that b2streamlines link in my searches!

Wingnutt also sent me a link to his design here: http://www.rcgroups.com/forums/showthread.php?t=1086013

We were going to take on the Evo-Zack, but after consulting Julian, he steered us toward his other design, the Freebaze NT, as it would be more suitable for this environment. I'm very happy to report that the design works really well.

These are dismal quality videos, but since the thread isn't buried at the moment, it might be the best time to post them. Nothing exciting happens in them, but we were happy to just have something gliding, aloft, and stable!

Seagrape Slope Flying: First Successful Wing! (1 min 51 sec)

Freebaze NT Model #2 (2 min 14 sec)


We have two at this point. The second appears janky, with its undersized wingtips and suboptimal covering, but flies well still! Also note that the Freebaze NT seems to have been taken up commercially at EPP Shape. Once I become more comfortable flying and adjusting the Freebaze, it could be fun and instructive to return and try the Evo-Zack.
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Old Oct 14, 2014, 10:30 AM
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I'll get the plans swotted up today. In the meantime, here's a totally-outside-the-box chevron wing. It is for light air, looks like it flies in the 5-15 mph range, and seems to have great handling characteristics. Plus a 2-3 hour build time, $2-$3 materials cost, and completely destroys my preconceptions about what an airfoil should look like.

Rusty Mustard is the designer-builder. http://www.rcgroups.com/forums/showt...ght=dark+angel.

BreakDancer plans soon.

Ed
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Old Oct 14, 2014, 02:00 PM
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BreakDancer E62

Andrew: the first image should get you the dimensions you need. The structure is simple: hotwired 2# foam cores; root section is PW 105, tip section is PW75 with 2* twist. Skins are 1.6" balsa. I painted them, but they'd resist dings better with film covering. They could also be fiberglassed. Tiplets are 1/8" balsa planks with rounded LE and tapered TE.

It has a two-piece wing. The tiplets attach to the wing with cellophane tape, and the wing attaches to the fuse pod with FG tape. Dead simple, forgiving in a dork. Fuse access is through the bottom. The power pod is FG braided sleeve over EPP foam.

Elevon Throws: Aileron 30* up, 20* down. Elevator 15* up and down. 10% exponential on aileron, 20% on elevator.

I built it powered. The power system weighs 9 oz, so if you go pure glider, it would weigh about 19 oz, or 7 oz/ft2.

The second image is from a spread sheet I use to calculate the planform and weight budget.

The third image is me after some superb autumn flying at about 9000' in the Central Rockies.

Enjoy!
Ed
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