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Stephen, Here's info from Paul Prentice's little book "Fly-About Adventures And The Ercoupe" (now out of print, I think) on page 38. C90 prop 7153 Alon A2, A2A Average QF (qualifying factor or slippages from pitch) = .97 -------------------- Cruise rpm = 2350 TIAS SL = 114 mph TAS 5000' = 123 mph -------------------- Max rpm = 2475 IAS SL = 120 mph TAS 5000' = 127 mph So, these numbers are approximately what you should expect in an Alon with a 7153 prop. A 7146 prop was an extreme climb prop on my C-85 and would be, I think, outside of the allowable static rpm range on the C-90. You might want to check the actual pitch with a protractor or with a prop shop. However, I'd still suggest you check actual rpm with a digital meter, first. Ed Burkhead http://edburkhead.com/ ed -at- edburkheadQQQ.com (change -at- and remove the QQQ) ========================================================================== ==== To leave this forum go to: http://ercoupers.com/lists.htm Search the archives on http://escribe.com/aviation/coupers/
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