DAYflyer
Topic Author
Posts: 3546
Joined: Wed Sep 08, 2004 9:35 pm

Is A Forward Swept Wing Pax Plane Possible?

Fri Oct 19, 2007 6:12 pm

I have seen renditions of forward swept wing fighters many times, but I wondered if the concept has ever been tried in a pax design, or if it is even practicle?
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LawnDart
Posts: 866
Joined: Fri May 20, 2005 11:33 pm

RE: Is A Forward Swept Wing Pax Plane Possible?

Fri Oct 19, 2007 6:16 pm

The Hansajet was built as a business jet and small passenger jet.

Google or check this out:

http://www.flight-manuals-on-cd.com/Hansa.html
 
PiedmontINT
Posts: 220
Joined: Sun Jul 10, 2005 8:12 am

Re: Is A Forward Swept Wing Pax Plane Possible?

Fri Oct 19, 2007 7:19 pm

The Citation Bravo has what is the illusion of a forward swept wing. I always thought it was swept forward just a bit, however I believe they are just very straight at the leading edge and more of a knife edge on the trailing edge. It gives the appearance of a forward swept wing, to me at least. Big grin


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B2707SST
Posts: 1287
Joined: Wed Apr 23, 2003 5:25 am

RE: Is A Forward Swept Wing Pax Plane Possible?

Fri Oct 19, 2007 7:52 pm

Quoting DAYflyer (Thread starter):
I have seen renditions of forward swept wing fighters many times, but I wondered if the concept has ever been tried in a pax design, or if it is even practicle?

The design is more aerodynamically efficient than a rear-swept wing, but the problem is that it is structurally unstable. As a forward-swept wing bends under load, the tips tend to twist upward, which increases the angle of attack, further loads the wing, and therefore further increases twist, until either the rigidity of the wing halts the twisting or the wing fails. This contrasts with the stable behavior of a rear-swept wing, in which the wingtips twist down under load and therefore unload themselves until an equilibrium is reached. The forward-swept wing has to be significantly stronger and therefore heavier.

For larger aircraft, the structural weight penalty of a forward-swept wing is greater than the aerodynamic benefits. Composite materials that can be tailored to resist certain stresses might help overcome the problem in future designs. On the other hand, the trend in wing design is toward higher loadings and higher aspect ratios, making tip twist harder to control.

Smaller aircraft like fighters tend to have relatively low aspect ratio wings that are more resistent to twisting moments, and they may also be dynamically unstable to begin, meaning they use artificial stability systems that could also counteract tip twist (e.g. by continuous adjustment of the ailerons).

--B2707SST

[Edited 2007-10-19 12:55:18]
Keynes is dead and we are living in his long run.
 
DAYflyer
Topic Author
Posts: 3546
Joined: Wed Sep 08, 2004 9:35 pm

Forward Sept Wing

Fri Oct 19, 2007 8:00 pm

Quoting B2707SST (Reply 3):

Thank you for the detailed explination of the limitations and challenges such a design would represent. It sounds like it wouldnt work.
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