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#11
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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 |
#12
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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 |
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