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----- Original Message ----- From: "DONALD BOWEN" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]>; <[email protected]> Sent: Tuesday, February 28, 2006 8:48 AM Subject: RE: FW: [COUPERS-TECH] Please send RPMs > ----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]---- > > > C-90 (in ALON) > 2350 > 2575 (initial climbout, gradually reducing to 2500-2525 ) > 2400 (sometimes to 2475 red line) > Don't recall prop model no., but it is a "compromise" one > between climb and cruise. > > > > > > > > > > > ----Original Message Follows---- > From: "WILLIAM BIGGS" <[EMAIL PROTECTED]> > Reply-To: "WILLIAM BIGGS" <[EMAIL PROTECTED]> > To: [EMAIL PROTECTED], [EMAIL PROTECTED], [EMAIL PROTECTED], > [email protected] > Subject: RE: FW: [COUPERS-TECH] Please send RPMs > Date: Tue, 28 Feb 2006 07:23:25 -0600 > > > All, > > It would probably help us all to send RPMs on ALL our coupes . > > Please post your > > Engine (C75, C85, C90) > Static RPM, > maximum RPM you see in the air, > normal cruise RPM. > Prop model, size, and pitch would also help. > > Thanks, > > Bill > > > > > From: "WILLIAM BIGGS" <[EMAIL PROTECTED]> > Reply-To: "WILLIAM BIGGS" <[EMAIL PROTECTED]> > To: [EMAIL PROTECTED], [EMAIL PROTECTED], [email protected] > Subject: RE: FW: [COUPERS-TECH] Do you have a C75 Ercoupe?? > Date: Mon, 27 Feb 2006 21:22:34 -0600 > > > > > > If you have a C75 in your Coupe please post your Static RPM, and the maximum > RPM you see in the air, and your normal cruise RPM. Prop model, size, and > pitch would also help. > > Data on C85s would also help > > Promise we won"t report it. Mabe we can get some "real" data so we can > better make our decisions. > > Thanks, > > Bill Biggs > > > > > > > From: "Ed Burkhead" <[EMAIL PROTECTED]> > Reply-To: "Ed Burkhead" <[EMAIL PROTECTED]> > To: "'John Cooper'" <[EMAIL PROTECTED]>,"Ctech" <[email protected]> > Subject: RE: FW: [COUPERS-TECH] C-85 STC, Performance, Props > Date: Mon, 27 Feb 2006 17:37:44 -0600 > >----[Please read http://ercoupers.com/disclaimer.htm before following any > advice in this forum.]---- > > > > > > > > > >John Cooper wrote: > > > I don't know where you get that idea from. The TCDS clearly > > > states "Engine Limits: For all operations, 2275 RPM (75 hp)." > > > Further more, the static RPM limits prohibit use of a prop that > > > would allow operation significantly above 2275 in all > > > > circumstances except a dive. > > > > > >John, > > > >Here's a thought that might contradict your assertion above: The C-85 on > a > >Coupe with a 1A90 prop has the middle of the static rpm range at about > 2125. > >Yet most planes can reach 2575 at full power in level flight. > > > >That's about a 450 rpm gain from static to full speed. > > > >But the top end of the static range on the C-75 is 2100. It would lead me > >to believe that the prop/engine combination *could* reach 2400 or 2500 at > >max power, delivering over allowed power. > > > >But, if the engine/prop combination delivers 75 hp at 2275 rpm at sea > level, > >then that prop which gives static rpm of 2100 would almost certainly be > able > >to cruise at 2275 rpm, delivering 75 hp and a good cruise at 1260 lb. > > > >Since we rarely > cruise at sea level, the power is reduced a little or a lot > >from 75 hp, even if we were to cruise at 2275 rpm, so, maybe we wouldn't > be > >running the power over what the engine can handle. (That engine is > >identical to the C-85 and 75% of 85 hp is 63.75%) > > > >What do you think? > > > >Ed Burkhead > >http://edburkhead.com > >ed -at- edburkhead???.com (change -at- to @ and remove "???") > > > > > >=========================================================================== === > >To leave this forum go to: http://ercoupers.com/lists.htm > > > > > > > > > ============================================================================ == > To leave this forum go to: http://ercoupers.com/lists.htm > > > > > ============================================================================== To leave this forum go to: http://ercoupers.com/lists.htm
