Martin Morgan wrote:

Gidday.

I'm just a lurker that is new to aircraft design and average at maths,
but...

It looks to me that the thrust cannot be calculated from the information
given.

I have a copy of Martin Hollman's "Modern A/C Design" where he gives some
simple formula for working out thrust given the velocity of the a/c, Hp,
prop diameter, prop speed and altitude. This appears to me to be
oversimplified in that it does not take into account propellor efficiency
etc. (it is really given for early design considerations, and most of his
stuff assumes 'normal' engines and propellors...).

When you add in that the a/c is climbing the effect of wing span loading has
a major effect. Additionally, is the flat plate area including the induced
drag of the wing? (quite a bit in climb).

Regards

Martin

Hint: prop efficiency has nothing to do with it. There is enough information.

Good question on the induced drag. Yes the flat plate area given is for 
that condition. As such it does indeed include induced drag.

Paul Lamar
 
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