lml@lancaironline.net Mailing List Archive

<<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> Posted for Rob Wolf <RWolf99@aol.com>: In a message dated 2/5/0 9:45:47 PM, you wrote: <<The idea is to stress the engine as hard as possible to detect any developing weakness>> Do you do your run-ups at full RPM also? Seems to me that's in keeping with your philosophy. And if you think you're operating the engine in a manner to cause it to fail, I have to ask why you're doing it? Wouldn't you rather take off at a lower setting and push it up to 100% at 1000 feet altitude? Didn't think so. Parts with a fatigue life are designed by derating the allowable material stress to account for the cyclic loading on the part. For an engine that's easy. 2500 RPM times 2000 hours tells you how many loading cycles will be on every part. I don't think that running the engine at an economy setting will prolong the life of pistons, connecting rods, and the like due to a reduced number of stress cycles. I think that a much stronger factor is excessive temperatures at higher power settings, and you protect against that by having your cooling system up to snuff. These things are designed to run at full power for takeoff and climb. Don't be afraid to use it. Of course, you could install an O-360 and run it at lower power settings, pretending it's only an O-320... - Rob Wolf >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> LML website: http://www.olsusa.com/Users/Mkaye/maillist.html Builders' Bookstore: http://www.buildersbooks.com/lancair Please send your photos and drawings to marvkaye@olsusa.com. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>