On Fri, 25 Nov 2005 23:16:20 -0500, "Morgans" wrote:

"Ron Wanttaja" wrote

In either case, he swapped it for a VW with the Valley Engineering PSRU
and is
now turning a 96 inch diameter prop with 60 inches of pitch. He claims it
provides 70% more thrust than the old engine. Hmmm, lengthen the gear
legs on
the Fly Baby.... :-)

Wow! It is hard for me to get my brain wrapped around the fact that a VW
could be stronger than an A-75, even with a redrive!

OX-5 engine: 90 HP
O-200 engine: 100 HP

Pull the OX-5 out of a Jenny, install an O-200, and try flying.

Back in the '60s, Boeing decided to build a replica of their first aircraft, the
B&W (Boeing and Westervelt) for the 50th anniversary of the company. The
original was a great big biplane and had a 125hp Hall-Scott A-5 engine with a
long, wide-chord prop.

http://www.centennialofflight.gov/es...y/Aero17G2.htm

The replica was ALSO a great big biplane. They used a geared GO-435 engine with
twice the horsepower and a leetle-bitty propeller.

http://1000aircraftphotos.com/Biplanes/BoeingB-W.htm

I've heard that the replica, even with twice the horsepower, can barely get out
of its own way. Big draggy airplanes want big, slow-turning props, and
apparently half the HP is OK if it's being pushed into a big prop.


Ron Wanttaja