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gcrowder2
Joined: 09 Jan 2006
Posts: 136
Location: Golden, Colorado USA
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 Posted: Thu Sep 25, 2008 10:38 am Post subject: New tandem wheel flying wing biplane - this one's different! |
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Would love to build this one in my spare time. Original was 78 sq ft and 172 lbs with engine. I have scaled it up to 110 sq ft C built it in X-plane with 50 hp C goes 160 mph C flies wonderful using NACA 23012 airfoil C stalls at 35 C although it just does the canard stall C bobbing it's nose gently in the breeze.
http://www.ligeti-stratos.com/
Glenn
Date: Thu C 25 Sep 2008 10:26:09 -0700
Subject: Re: Monowheel designs... any others out there?
From: fklein(at)orcasonline.com
To: europa-list(at)matronics.com
.ExternalClass .EC_EmailQuote {margin-left:1pt;padding-left:4pt;border-left:#800000 2px solid;}
On Thursday C Sep 25 C 2008 C at 08:11 US/Pacific C rick wrote:
Just as a matter of interest could I turn a Mono on my short C very bumpy C grass strip (max 20' wide with no turning area) after backtracking in a strong wind. I sometimes have trouble with my trike using full braking on one wheel!
!!...touche'...that needle do twist nicely...ouch...always nice to recognise the depth of our commitment to our respective decisions...pity we tend to cloak ourselves in claims of rationality for what is C IMO C an essentially irrational enterprise...but I love this thread which again C IMO C celebrates the extreme flexibility of a wonderful airframe which sees such variety (mono C trigear C conventional taildragger C short wings/long wings C Rotax C Soobs C Jabs C CAM/Honda C Smart Brabus C O-200 C and ; --> See how Windows connects the people C information C and fun that are part of your life. See Now [quote][b]
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craigb(at)onthenet.com.au
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| Posted: Fri Sep 26, 2008 5:07 pm Post subject: New tandem wheel flying wing biplane - this one's different! |
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How weird is that, the design is very close to one I was considering to scratch build before i started on my XS, glad to know it will
fly ok, I didnt think anyone else would like such a departure from the "norm", my only concern was where to put the prop, I was thinking
about belt drive ducted fans between the two wings
[quote] --
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peterz(at)zutrasoft.com
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| Posted: Sat Sep 27, 2008 8:23 am Post subject: New tandem wheel flying wing biplane - this one's different! |
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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), while his obviously was not?
Cheers,
Pete
A239
On Sat, Sep 27, 2008 at 10:06 AM, 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,
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, 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, 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, 27 Sep 2008 11:14:23 +1000
How weird is that, the design is very close to one I was considering to scratch build before i started on my XS, glad to know it will
fly ok, I didnt think anyone else would like such a departure from the "norm", my only concern was where to put the prop, I was thinking
about belt drive ducted fans between the two wings
[quote] --
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fklein(at)orcasonline.com
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| Posted: Sat Sep 27, 2008 10:29 am Post subject: New tandem wheel flying wing biplane - this one's different! |
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On Saturday, Sep 27, 2008, at 09:22 US/Pacific, Peter Zutrauen wrote:
| Quote: | 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), while his obviously was not?
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Peter...if you check further into this, you'll find that the "stall
accident" and fatality occurred in a 2nd prototype incorporating
significant modifications from the original...Fred
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