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Sanchises
Sanchises
5:38 AM
robbreport.com/motors/aviation/… In today's episode of fantastical designs. 70% fuel savings at claimed by moving the fuel tank and engines out of the six(!) wings because the wings are then "thinner and aerodynamic". And all this with cruising speed of M0.9 with straight wings for better short field performance. :)
 
Sanchises
Sanchises
5:50 AM
(and don't forget all fuel is now stored above the passengers heads... Yikes)
 
 
13 hours later…
ymb1
ymb1
6:51 PM
@Sanchises fascinating; they must have found unobtainium to use for "thinner" wing spars, and loving the zero consideration for the aft-tilted lift (more drag) of the 2nd and 3rd wings due to downwash
actually if the 2nd and 3rd wings don't have higher incidence (which is more drag in and of itself), they would be creating downforce
3
Q: Induced drag reduction from tandem wing

AbdullahInduced drag is proportional to the square of span loading. The normal method to decrease it would be to increase span. This, however, leads to an exponential weight increase. So, my question is, if tandem wings are placed with a large longitudinal gap, so as to avoid downwash, would they act as ...

aircraft-design aerodynamics wing drag
The downwash is about as high as wide, and angled only by a few degrees (more at slow speed). So the longitudinal distance needs to be many times longer than the wing span to make the wings independent.
 

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