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Hartmut, et. al., How much actual difference is there in fuel consumption between a. 75 hp engine in a Coupe flying 100 mph b. 85 hp engine in a Coupe flying 100 mph c. 100 hp engine in a Coupe flying 100 mph d. 125 hp engine in a Coupe flying 100 mph ??? I'm thinking fuel consumption will relate closely to the energy being expended. Hartmut is right that a Coupe wouldn't speed up very much by adding a 125 hp engine. A Florida Coupe owner tried that about 15 years or so ago - he reported it climbed like and angel but didn't go much faster. He added a second fuel tank in each wing for 18 extra gallons. Yet, couldn't you use the extra power to improve climb, then slow down to the same old cruise speeds and get good range by not using significantly more fuel? About the engine weight, the Franklin website says: "The 4A-235 weighs within a few pounds of an 0-200 when the engine are comparably equipped, yet it is rated at 125 HP." Yet, Teledyne Continental's lists the O-200 weight dry basic engine as 170.18 lb., while Franklin lists theirs as 206 lb. It seems like 36 lb. is significant. Still, the extra power would get you off the ground quicker and lift you faster. Doing what else you could for lightness during the change like a lighter starter, mags, etc., might make up some of the weight difference. 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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