VW Redrive Mounted on the Case's Generator Pad?

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

On Sat, 26 Nov 2005 00:15:29 -0800, Ron Wanttaja
wrote:

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.

That's the basic formula all WWI era aircraft used. All the pics of
them show these monster props with very little ground clearance.

Since they didn't fly very fast, it didn't matter that the props were
slow spinners.

Corky Scott