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Old Feb 05, 2013, 01:40 PM
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A.I. Pietsukh’s PAI-67


The A.I. Pietsukh’s PAI-67 is interesting and unusual configuration.

If you the look at the drawings (assuming they are accurate) the fore wing appears have less angle of incidence than both the main wing and rear horizontal stabilizer. Both of which appear to have the same angle of incidence. This goes against my understanding that a stable tandem wig configuration where the fore wing should be the higher loaded wing.

The rear horizontal stabilizer is set much lower than most ram wing and lippisch reverse delta wigs...but the elevator is huge. I wonder whether the horizontal stability was controlled by the trim of front water prop drive and/or hydrofoil.

The main aft wing planform also very interesting. It could almost be considered a Double Delta Wing Bixel with anhedral.
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Old Feb 05, 2013, 03:36 PM
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Quote:
Originally Posted by nbrophy View Post
If you are interest in the joined wing, I know there was some early posts on the Yahoo Wig group concerning utilizing joined wing configuration in ground effect.
me interests box-wing in combination with it wing-in-ground



various options, like it



http://www.architectswanderlust.com/...stol-aircraft/
Last edited by qxev; Feb 05, 2013 at 04:41 PM.
Old Feb 08, 2013, 05:59 PM
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Old Feb 10, 2013, 12:20 AM
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qxev, I thought Holden at homebuilt airplanes.com, Paul Weston Sea-Era thread told you the craft in these exact pictures you posted would not work IGE. He seems pretty qualified to know what he is talking about.
He mentioned the AC remains close to the Center of Area on the delta whereas rectangular or square wings AC moves back from 25% to 50% (center of area) IGE causing a negative pitching moment.
Old Feb 14, 2013, 03:01 PM
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Originally Posted by captarmour View Post
qxev, I thought Holden at homebuilt airplanes.com, Paul Weston Sea-Era thread told you the craft in these exact pictures you posted would not work IGE. He seems pretty qualified to know what he is talking about.
He mentioned the AC remains close to the Center of Area on the delta whereas rectangular or square wings AC moves back from 25% to 50% (center of area) IGE causing a negative pitching moment.

http://www.sunny-boxwing.de/Greenwings.html

http://www.patent-de.com/19860710/DE3500575A1.html
http://www.sunny-boxwing.de/wigwings.htm



conclusions by results of calculations.

this configuration showed high stability at good controllability
Old Feb 17, 2013, 05:37 PM
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I tried something similar it only worked with flat airfoils, with camber and drooped LE, like slats it flies like an airplane, would not remain IGE.
Old Feb 17, 2013, 05:39 PM
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VID 00009 20110607 1859 (0 min 21 sec)
Old Mar 25, 2013, 08:39 AM
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Delta-2 Lippisch-type ground effect glider


Gabriel,

I was watching your video of your “Delta-2 Lippisch-type ground effect glider" you posted last year in the thread. It appears really stable. Does your glider have flat or cambered airfoil? What is angle of incidence of the reverse delta main wing? What was the weight?
Old Mar 25, 2013, 07:33 PM
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Originally Posted by nbrophy View Post
Gabriel,

I was watching your video of your “Delta-2 Lippisch-type ground effect glider" you posted last year in the thread. It appears really stable. Does your glider have flat or cambered airfoil? What is angle of incidence of the reverse delta main wing? What was the weight?
I've made plans today : https://www.dropbox.com/s/bac9nv7eie...sG_A4print.pdf
Old Mar 25, 2013, 10:08 PM
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Old Apr 01, 2013, 02:27 PM
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Airplane+wing in ground (5 min 6 sec)
Old Apr 03, 2013, 12:44 PM
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http://m.youtube.com/#/watch?feature=plcp&v=mLAzm3sKVU8

Tried my delta canard IGE, but as you can see she doesn't want to stay low.
Old Apr 07, 2013, 09:03 AM
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Hello, I think, it behaves very well
Old Apr 10, 2013, 11:41 PM
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thanks, how do u like these?

Low flying (2 min 26 sec)


Low flying (2 min 26 sec)
Old Apr 10, 2013, 11:42 PM
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oops

55 degrees (7 min 40 sec)


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