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gcrowder2
Joined: 09 Jan 2006
Posts: 136
Location: Golden, Colorado USA
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 Posted: Sat Sep 27, 2008 6:07 am Post subject: New tandem wheel flying wing biplane - this one's different |
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This is an incredible concept that has not been utilized IMO. The joined wing concept is the most efficient per NASA studies
http://www.aoe.vt.edu/design/ikelos/ as it eliminates the draggy tip vortices that plague all other designs. The Stratos has
an L/D of 19/1 and the original needed flaps to degrade the glide enough to allow a steeper landing approach. You have
effective sailplane efficiency in a very compact planform. In addition the wings can be made much lighter as the joined wing
at the tips adds great strength. The lower wing is totally flat with no dihedral making it easy to build. The upper wing needs
no twist and uses 2 deg dihedral. Other advantages are much stronger pilot/passengers protection due to the cage type construction C
wide tolerance of CG changes and greater tolerance for gusty conditions due to the short wings.
On the sim it is possible to take off with the stick full back C just wait for rotation and the a/c will just climb away bobbing its
nose with full roll and yaw control. Fully aerobatic too but pitch sensitivity is a little much for landing in this mode C easily
corrected with a pitch limiter for landing. Don't see why the concept couldn't work for crowd killers as well as the short wings
should allow twice as many gates at the terminal.
Very cool pic: http://www.ligeti-stratos.com/assets/images/hg_3_big.jpg
From: craigb(at)onthenet.com.auTo: europa-list(at)matronics.comSubject: RE: Europa-List: New tandem wheel flying wing biplane - this one's different!Date: Sat C 27 Sep 2008 11:14:23 +1000
How weird is that C the design is very close to one I was considering to scratch build before i started on my XS C glad to know it will
fly ok C I didnt think anyone else would like such a departure from the "norm" C my only concern was where to put the prop C I was thinking
about belt drive ducted fans between the two wings
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gcrowder2
Joined: 09 Jan 2006
Posts: 136
Location: Golden, Colorado USA
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| Posted: Sat Sep 27, 2008 9:44 am Post subject: New tandem wheel flying wing biplane - this one's different |
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Don't know the exact answer but the designer was not killed while flying the original prototype. The original proto is still flying and is flown by Charles son C
Ron Ligeti C an aeronautical engineer C who is reverse engineering the prototype to create new open source plans that will be available on the website.
According to the site C Charles was test flying a new larger version to become a kit version of the a/c.
"A channel or third wing was added to the fuselage. The bottom of the channel blended into the duct. Two different accounts of the purpose of the duct have been advanced:
Ron Ligeti’s interpretation is that the ducted fan drew air over the channel to create a low pressure area and increase lift.
Romeo Garcia C a member of the original construction team C reports that the purpose was to channel more air into the duct for improved propulsion.
It is believed that one or more of these modifications changed the stall characteristics significantly C possibly by occluding or creating turbulence ahead of the duct at a high angle of attack."
I have a theory that the rhino rudder as installed on the proto to yaw the plane for landing without banking might behave unpredictably in a high angle stall scenario but
thats just my speculation. On the sim I have eliminated the rhino rudder and gone to a retractable tri gear setup to allow more ground clearance for a larger prop.
I can attach the sim for X-plane V7 if anyone is interested but it will have to wait until I get a new hard disk for my desktop as it got hammered yesterday!
Date: Sat C 27 Sep 2008 12:22:39 -0400
From: peterz(at)zutrasoft.com
To: europa-list(at)matronics.com
Subject: Re: New tandem wheel flying wing biplane - this one's different!
Very slick design - but one question: As the original designer died in it in a "stall accident" what are the changes that you have made in the x-plane version from his original which has made it stall-proof (ala canard) C while his obviously was not?
Cheers C
Pete
A239
On Sat C Sep 27 C 2008 at 10:06 AM C glenn crowder <gcrowder2(at)hotmail.com (gcrowder2(at)hotmail.com)> wrote:
[quote] This is an incredible concept that has not been utilized IMO. The joined wing concept is the most efficient per NASA studies
http://www.aoe.vt.edu/design/ikelos/ as it eliminates the draggy tip vortices that plague all other designs. The Stratos has
an L/D of 19/1 and the original needed flaps to degrade the glide enough to allow a steeper landing approach. You have
effective sailplane efficiency in a very compact planform. In addition the wings can be made much lighter as the joined wing
at the tips adds great strength. The lower wing is totally flat with no dihedral making it easy to build. The upper wing needs
no twist and uses 2 deg dihedral. Other advantages are much stronger pilot/passengers protection due to the cage type construction C
wide tolerance of CG changes and greater tolerance for gusty conditions due to the short wings.
On the sim it is possible to take off with the stick full back C just wait for rotation and the a/c will just climb away bobbing its
nose with full roll and yaw control. Fully aerobatic too but pitch sensitivity is a little much for landing in this mode C easily
corrected with a pitch limiter for landing. Don't see why the concept couldn't work for crowd killers as well as the short wings
should allow twice as many gates at the terminal.
Very cool pic: http://www.ligeti-stratos.com/assets/images/hg_3_big.jpg
From: craigb(at)onthenet.com.au (craigb(at)onthenet.com.au)
To: europa-list(at)matronics.com (europa-list(at)matronics.com)
Subject: RE: New tandem wheel flying wing biplane - this one's different!
Date: Sat C 27 Sep 2008 11:14:23 +1000
How weird is that C the design is very close to one I was considering to scratch build before i started on my XS C glad to know it will
fly ok C I didnt think anyone else would like such a departure from the "norm" C my only concern was where to put the prop C I was thinking
about belt drive ducted fans between the two wings
[quote] --
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