Annulus (Epp Annular Wing design) - RC Groups
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Jun 28, 2010, 06:29 AM
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Kouros's Avatar

Annulus (Epp Annular Wing design)

I designed this experimental foamie for 3D slowflying in my garden. The model shown in the pictures is the second version of the prototype. She flies relatively well. Future prototypes will have further improved flying caracteristics.
The design is based on an 'annular wing' or 'ring wing'. Inherent the concept wing efficiency theoreticly should be higher than a comparable flat wing. She can fly extremely slow and hoovers well.
The model is strong, compact and relatively easy to build. The prop is safely located inside the wing (at the center of gravity) so it can not cause injury. Ailerons are partialy blown by the prop for increased efficiency at low flying speed.
I used 8 mm Epp sheet: 20 g/l overall and 30 g/l for ailerons and vertical fuselage.
Weight is 165 g empty and 465 g ready to fly. Span is 520 mm, length 720 mm, and height is half the span (so frontal view is elliptical).
The colordesign is funny, though it was never my intention to build a flying fish or shark.
I ad some pictures for those who have interest.
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Jun 28, 2010, 06:53 AM
“There’s no place like Foam”
gpw's Avatar
Very Cool !!
Jun 28, 2010, 07:31 AM
Registered User
For not planning to build a shark, you sure made a nice looking one . Can't wait to see it fly...
Jun 28, 2010, 09:04 AM
SG Talon... Super Genius.
THat is a beautiful plane Kouros!

Are you going to put up some plans? I know a lot of people would love to build it. The shark theme is great too.

A video would be awesome too.
Jun 28, 2010, 09:05 AM
“There’s no place like Foam”
gpw's Avatar
Might be Cool in combat with the old bearded Love clam ... hahahahahaha

Shark vs. Clam
Jun 28, 2010, 11:33 AM
When pigs fly rc
rcrich's Avatar
Please post some video. Looks great in pics.
Jun 28, 2010, 03:23 PM
Registered User
Kouros's Avatar

Annulus IIb

Thanks for the quick respond. Indeed she would serve succesfully in combat (without severely damageing opponents)!
I add some more pictures and I soon will post a good video too.
I do have plans (evident, as I designed the model), but I think it would be better to wait for the model to have excellent flight characteristics first before you start building.
Jun 28, 2010, 03:46 PM
Registered User
xtremeRCpilot's Avatar
WOW, that is too Fun!! Great job!! Please post a video if possible!! Its always nice watching someone fly something everyone else says wont fly LOL

Jun 28, 2010, 05:04 PM
Robert Kettner
Looks good!
Jun 28, 2010, 05:38 PM
Fly 3D Mon!
3DMON's Avatar
Unique design. I like the way it looks in the air.
Jun 28, 2010, 06:54 PM
,ɯǝ ʇoƃ ɐʎ ɟı ,ɯǝ ǝʞoɯs
7up's Avatar
It looks great as a shark, intentional or not. Very cool!

I'd like to see this chasing a Flying Surfer Dude.
Jun 28, 2010, 06:55 PM
For us He died, in me He lives
Jimmy JFlyer's Avatar
OK so this is very very cool!
So I take it this is 4 chnl AERT?
How do ya'll think something like this would do just RET?
Jun 28, 2010, 06:56 PM
For us He died, in me He lives
Jimmy JFlyer's Avatar
Originally Posted by 7up
It looks great as a shark, intentional or not. Very cool!

I'd like to see this chasing a Flying Surfer Dude.
Now that would be a serious Hoot!
Jun 28, 2010, 08:38 PM
My plans are in my blog
Rusty-Gunn's Avatar
This is the coolest plane I've seen in a while, dude.
Jun 28, 2010, 08:56 PM
2^p - 1
signflyer's Avatar
Really unique design, great paint, looks fantastic in the air! Well done!

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