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Swing Wing Aircraft Dynamics

GR4Jockey

GR4Jockey

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5
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unitedkingdom
Hi Gents

I need you advice, when entering dimensions for the aircraft, should I use wings aft or wings forward dimensions as wings forward is actually at flap position 2. Should the aircraft performance be based on the swept configuration?

Thanks in advance

Richard
 
I say yes as the forward positions add lift and drag - just like a flap.
 
agreed. flaps zero as swept, then increments up to wings forward, then increments of wings forward plus actual flaps.
 
The Tornado has variable sweep, but for performance and handling purposes it has three sweep angles. Fully swept is 67° and this position is used mainly for supersonic flight. Intermediate is 45° which is frequently used for high subsonic cruise, although it can also be used supersonically. Forward is 25° which is used for take-off, landing and low speed cruise.
Wing span is obviously different at each sweep angle, but so is wing area and root chord.
Lift vs AOA is also significantly different at each sweep angle.
Flaps can be used to fudge the fact that there are three airplanes in one, but in FS flaps just add CL and do not affect the slope of CL vs AOA.

The point I'm making is that the aircraft wing dimensions for the three sweep angles are very different for one thing and only one set of dimensions and airfile coefficients can be used.
While you can try simply choosing one of the three sweep angles as a basis, my experience with modeling the Tornado has been that a lot of analysis and flight test is required to get performance and handling characteristics that match the Flight Manual. It would have been easier if the choice was swept or not swept, but there are three choices that need to be investigated.

Roy
 
Thanks for your advice, tried to create the dimensions and balance within airwrench based on wings 25 degrees, manoeuvre flap up. Used dimensions as per manual and scaled drawings for wing, fin, tailerons and fuselarge length. Set CoG as per actual, placed fuel tanks as per actual including forward group, rear group, 440kg fin tank and wings, positioned engines, tailerons, fin and undercarriage as per actual, ended up very nose heavy and would not get into air even at 300 kts. Not an easy aircraft for flight dynamics

Richard
 
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