Edge Wingtips

[teryn]

Thank you. I am looking forward to this.

	Quote: Originally Posted by Ion01
	I just increased the contrast on the picture to show the vortex better. Like I said, it is relatively small due to the fact the the flow velocity is slow. Anyways, I will try to get the write up as soon as possible to help make things more clear and if you or anyone else is still interested then I will be happy to discuss it and provide additional information. Thanks for your interest.

[Ion01]

Dick-
That is the way I understand it as well. My design reduces or completely eliminates the wingtip vortex by providing an opposing force at the leading edge of the wing which forces the air to flow over the cord which will increase lift and reduce drag. My design doesn't use winglets of any sort and is not a new concept by any means but has never been applied to props and materials were not available in the past to handle the higher stress this design imposes on the prop and/or wing. I will try to have the write up tonight, however it does not show my design in an effort to protect it. I will have a document which will need to be signed and mailed or faxed to me which will just ensure the confidentiality needed and that the design belongs to me. At that point I will provide a CAD rendering of my design and contact information so that those who are interested in my design can contact me for further information. I don't have the money or means to produce this design as I don't even have the money for a gas airplane. Thats where the rc companies that are interested come in. If they are interested then I will contract with them to have it produced.

[Ion01]

Btw- Thanks for all your interest and input. Anything constructive is greatly appreciated. When I get it up I will start a new thread.

[dick hanson]

The increased span approach simply is no good on extreme aerobatics -great on gliders tho--
For a highly maneuverable craft and one which will make very short flat turns -- a low aspect ratio is king.
I was after stopping spanwise flow - as much as practical -on a short wing
th approach is sound -Ihave testesd it (as have others) with the strange looking side force generators
they effectively stop the "falling leaf " side to side wagging at high angles of attack - you have to do this experiment to appreciate it
I also routinely saw the tips off large ARFS- and lighten them as much as practical - this makes big improvement in snap maneuvers . In this case the tip plates were simply trial to see if any benifit existed .
Like giving an enema to a dead horse - it did not seem to hurt anything.

[dick hanson]

a plane flown now by Peter Besenyie (?) a Velox note the tips .

[dick hanson]

b

[teryn]

they look OK - maybe a bit sexy - but do they really do anything, and what is the scientific justification for them? At this point it is just a psychological facade put in the eyes of the opponent. I am still not convinced by all these conjectures that are not backed up by any data.

[dick hanson]

Yeh but I am more concerned with data that has no real application.
Let me clarify that remark--
I seriously doubt any current texbooks address the aerobatic flying done by such as Peter Besenyie.
So unless you have a background in high speed skidding maneuvers etc., I suspect the real value of the devices are simply an unknown.
I am not a believer in Voodoo aerodynamics but I have leared -thru experience that the textbook approach to resolving the unknown is often found wanting --
for example - what airfoil is better for flat foamies than the flat airfoil. answer None .-- the flat shape is the best.
Why ? -It works best.

[adrian]

well i have flown these new 4d foamies and until you have you will not believe it - i have also flown a H9 showtime with all the SFG' stuff - amazing how easy a KE becomes and how steady a TR is and the rest - now these things certainly work and soon we will use then on our big planes 100% - theory, well good to know and then you just try the mods until it works or dump it - lol

[dick hanson]

yes that is how it is done in the real world.
I had the Showtime with a piped 26 and it really responded better at high AOA, with the panels in place .
The learned ideas for a relatively low powered full scale aircraft are really not helpful on a high powered, low wing loading plane which is constantly flying in vectored attitudes.
All the correctly stated laws of physics do apply - but much data in the textbooks is simply out of date -
When in doubt --test it out -