[quote]Thrust in a propeller aircraft drops off quite quickly due to decreasing propeller efficiency as speed increases. So the greatest excess thrust and hence best angle of climb occurs at quite a low speed. Strictly speaking this is at the lowest safe flying speed but a slightly higher speed is usually recommended.<hr></blockquote>
Hmmm.. depends upon your definition of "lowest safe flying speed" I suppose, but you can fly quite safely near the stall, and have very little excess thrust, and almost no climbing ability.