I am ordering a Catto 60"/3 bladed prop for a W-8 Tailwind ( est. 825# empty
- gross at 1350#)

      13B 1987 rebuilt to Tracy Crook manual
      6500 RPM redline
      2.17 Tracy redrive
      assuming 160 H.P.
      Catto suggesting using 160 H/P. 3000 RPM at prop - 60" pitch
      top speed 170 MPH
      I talked to Jerry Hey and he is talking higher A/S
      I have done no exotic things to the motor.

Any comments would be received with gratitude.

Dale Williams
Dwilliams@vymac.com

Jerry Hey is our expert on Tailwinds.

What does the intake manifold look like. Can you take
some digital pictures? A lot depends on the intake manifold
as far as HP is concerned. Max engine RPM will be 6500
at 3000 prop RPM so that works against a lot of HP. You may have
less than 160 HP depending on the manifold.

I assume there has been no street porting.

Gross weight has little to do with top speed and mostly
to do with climb rate.