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bob, just an addendum to the discussion of the various data on the "correct" static rpm-range. i just read in a 1960 stc-document for a 415D with C90-12F and a mccauley 1b90-cm7152 propeller (stc from skyport) a static rpm of 2075-2175. even lower than the rpm-range you reported from the alon-manual. even given the fact that the pitch of 52 is greater than your 50, a low static rpm under 2175 seems to be ok at least for some engine/prop combinations. the stc claims, that start+climb performance etc. is "equal or better than with a C-75 at all altitudes/temperatures" but gives no data to amend the original manual. hope this information is helpful yours, holger zinke [EMAIL PROTECTED] zwingenberg, germany ========================================================================== ==== To leave this forum go to: http://ercoupers.com/lists.htm Search the archives on http://escribe.com/aviation/coupers/
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