Warbird Information Exchange

Doubt it is anything significant. Biplanes are biplanes. You can put as much power as you want, but there is still a ton of drag to overcome. You eventually reach a point where the amount of power exceeds the structural integrity.

Can I quote you on that slice of data?

Here is some quotable data for you. This is probably the slickest, top of of the range numbers one can get out of a Stearman. keep in mind A LOT of effort was put into minimizing the drag here.. Drag means more than power on the motor.

https://www.eaa.org/eaa-museum/museum-c ... 21r-n5051v

Thanks for that! Cruise Speed: 150-190 mph...

Maximum Speed: 330 mph (with or without the wing-walker?)

A stock Stearman with a metal prop should cruise a little over 100 MPH by comparison, depending on the prop pitch. I think I used to used a dive to 160 MPH for a loop entry speed to make them nice and rounded. I just can't imagine over 300 MPH in a Stearman!