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About the comment that $500.00 is a lot of price for an Ercoupe Prebuy inspection - don't see how this could be too much - a good Prebuy would very nearly be the same process as an Annual, and an Ercoupe has a lot more time in it to do an Annual than many Cherokees, C-172's and the like. It seems like there are lots more things to remove and inspect and lube than simple current-day aircraft. That's why Richard talked about the cost of an Annual. If you are like me, you will search out a good A&I who will let you do an owner-assist Annual to keep the cost down. $500.00 just doesn't seem to be all that much out of line when you consider the number of hours involved. -Ron > [Original Message] > From: Ercoupe Technical Discussion (moderated) <[email protected]> > To: Ercoupe Technical Discussion (moderated) <[email protected]> > Date: 5/17/2005 2:00:21 AM > Subject: Digest list: Ercoupe Technical Discussion (moderated) > > ----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]---- > > > Message list: > > 1. [COUPERS-TECH] Engine RPM > 2. RE: [COUPERS-TECH] Engine RPM > 3. Fwd: Re: [COUPERS-TECH] Engine RPM > 4. Re: [COUPERS-TECH] Engine RPM > 5. Fwd: Re: [COUPERS-TECH] Engine RPM > 6. Re: Fwd: Re: [COUPERS-TECH] Engine RPM > 7. [COUPERS-TECH] Ercoupe prop static rpm > 8. Re: Re: [COUPERS-TECH] Engine RPM > 9. Re: Fwd: Re: [COUPERS-TECH] Engine RPM > 10. [COUPERS-TECH] UNSUBSCRIBE [email protected] > > Messages: > > From: Charles Waldo <[EMAIL PROTECTED]> > To: [email protected] > Reply-To: Charles Waldo <[EMAIL PROTECTED]> > Subject: [COUPERS-TECH] Engine RPM > > Folks > > Kinda new to this forum, I'm having a prebuy done on a 46 coupe with a c85. Compressions look good at 78,78,78,74....it has a 69-50 prop and the static RPM shows 2250.......what I am looking for is real world rpms for this setup....what are you folks seeing...... > > Chuck > > > ---------------------------- > From: "Wood, Percy" <[EMAIL PROTECTED]> > To: 'Charles Waldo' <[EMAIL PROTECTED]>, [email protected] > Reply-To: "Wood, Percy" <[EMAIL PROTECTED]> > Subject: RE: [COUPERS-TECH] Engine RPM > > `Believe that's about right, Chuck. The experts, who are not at work and > have their POH's available, will give you better information. "If the > `coupe fits, buy it." Percy > > > > _____ > > From: Charles Waldo [mailto:[EMAIL PROTECTED] > Sent: Monday, May 16, 2005 8:52 AM > To: [email protected] > Subject: [COUPERS-TECH] Engine RPM > > > > > ----[Please read http://ercoupers.com/disclaimer.htm before following any > advice in this forum.]---- > > > Folks > > Kinda new to this forum, I'm having a prebuy done on a 46 coupe with a c85. > Compressions look good at 78,78,78,74....it has a 69-50 prop and the static > RPM shows 2250.......what I am looking for is real world rpms for this > setup....what are you folks seeing...... > > Chuck > > > ========================================================================== == > == > > To leave this forum go to: http://ercoupers.com/lists.htm > > Search the archives on http://escribe.com/aviation/coupers-tech/ > > > > > > > > > ---------------------------- > From: Charles Waldo <[EMAIL PROTECTED]> > To: Ercoupe Tech <[email protected]> > Reply-To: Charles Waldo <[EMAIL PROTECTED]> > Subject: Fwd: Re: [COUPERS-TECH] Engine RPM > > Good Question! I went back through the paperwork and found that it was replaced with a McCauley LA90 a while ago, but no mention of the 69-50! I called the mechanic who did the prebuy (and has rebuilt a couple of coupes).. he says the prop engine combo is okay, but as you said it might not be correct for that airframe.......I'll let you know what happens and thanks for the warning! > > Chuck > > Note: forwarded message attached. > > At 10:52 AM 5/16/2005, you wrote: > >...it has a 69-50 prop and the static RPM shows 2250...... > > Is this a typo? I'm not aware of any 69" prop that's approved for a C85 in > a 'Coupe. Acceptable static RPM is published in the TCDS fro each approved > prop/engine combination. > > John Cooper > Skyport Services > PO Box 249 > 4996 Delaware Tnpk > Rensselaerville, NY 12147 > 518 797-3064 > Fax 518 797-3865 > > ---------------------------- > From: John Cooper <[EMAIL PROTECTED]> > To: [email protected] > Reply-To: John Cooper <[EMAIL PROTECTED]> > Subject: Re: [COUPERS-TECH] Engine RPM > > At 10:52 AM 5/16/2005, you wrote: > >...it has a 69-50 prop and the static RPM shows 2250...... > > Is this a typo? I'm not aware of any 69" prop that's approved for a C85 in > a 'Coupe. Acceptable static RPM is published in the TCDS fro each approved > prop/engine combination. > > John Cooper > Skyport Services > PO Box 249 > 4996 Delaware Tnpk > Rensselaerville, NY 12147 > 518 797-3064 > Fax 518 797-3865 > > ---------------------------- > From: Charles Waldo <[EMAIL PROTECTED]> > To: Ercoupe Tech <[email protected]> > Reply-To: Charles Waldo <[EMAIL PROTECTED]> > Subject: Fwd: Re: [COUPERS-TECH] Engine RPM > > Yuck.....the engine in question is a C85-12F.....The part I love the best is the mechanic approved the buy and sent me a prebuy invoice for $500 bucks! Then you folks pointed out it had the wrong prop and I asked him about it....now he says your correct and its the incorrect prop.......he now says don't buy it.......I wonder what else he missed..... > > Chuck > > Note: forwarded message attached. > > Charles, The O-200 engine uses a 69-48 Climb prop and a 69-50 cruise > prop. as installed on a C-150. Also STC to put the O-200 on a Ercoupe > directs the use of a 69" prop (not sure of the pitch though) Confusing > isn't it. I would go by the Type Certificate for your airframe and it > will give props acceptable and also static RPM for each. > > Rich Blair > N99997 & N23287 > Kingsland, Ga. > > > > ---------------------------- > From: John Cooper <[EMAIL PROTECTED]> > To: Charles Waldo <[EMAIL PROTECTED]>,Ercoupe Tech <[email protected]> > Reply-To: John Cooper <[EMAIL PROTECTED]> > Subject: Re: Fwd: Re: [COUPERS-TECH] Engine RPM > > At 01:24 PM 5/16/2005, Charles Waldo wrote: > >found that it was replaced with a McCauley LA90 a while ago, but no > >mention of the 69-50! > > Now I'm more confused. where did the "69-50" come from? What is the make > and model of the prop currently installed? (69-50 refers to length and > pitch. 1A90 is a McCauley). > > I'm more familiar with McCauleys, but I am not aware of ANY 69" metal prop > approved for a C85. could be wrong, though. > > > John Cooper > Skyport Services > PO Box 249 > 4996 Delaware Tnpk > Rensselaerville, NY 12147 > 518 797-3064 > Fax 518 797-3865 > > > ---------------------------- > From: "Ed Burkhead" <[EMAIL PROTECTED]> > To: "Charles Waldo" <[EMAIL PROTECTED]>,"Coupe-Tech" <[email protected]> > Reply-To: "Ed Burkhead" <[EMAIL PROTECTED]> > Subject: [COUPERS-TECH] Ercoupe prop static rpm > > Chuck asked: > > I was wondering where I can find what the static rpm should be for > > a 46 coupe upgraded to a c85 with a 69-50 prop? any ideas? I just > > had a pre buy done on one. the compressions where 78,78,78,74, > > which is pretty good but the static RPM was 2250.......I would > > think this might be a little low....... > > > Chuck, > > My first worry is that a 6950 prop, with a length of only 69 inches, won't > convert the engine's power to motion properly - it's too short. That's > reflected in your 2250 static rpm which is actually too high for a C-85. > > On Ercoupes, the only short props allowed by the type certificates are on > the C-90 (minimum 69.5") or O-200 engines. > > On the C-85 engines, the type certificate calls for static r.p.m. of "not > over 2225, not under 2025." > > With my C-85 and a 7146 prop, I was right on the line at 2225 rpm static (on > the ground - zero wind - full power). > > 7146 - extreme climb prop > 7148 - normal climb prop > 7150 - normal prop > 7152 - "cruise" prop (which may cruise horribly because of inability for the > engine to spin the prop to speed resulting in little climb and way-slow > cruise speed) If you're flying at a light weight, you may cruise fast. > > Presumably, the 7152 would give a static rpm of barely up to the minimum of > 2025. > > The STC for the O-200 engine calls for a prop something like the 6950 > because that was standard on Cessna 150s so there are a lot of them out > there on wrecked aircraft so that's what the original STC applicant > specified. The higher power engine is allowed to spin faster by the smaller > prop so it can develop rated horse power. Still, that engine/prop on a Coupe > gives good climb but not so good cruise. > > To put that prop on a C-85 will have substandard results. > > The link to the type certificates is on my Coupe web page, at the bottom. > See Note 4 (at the bottom of A-787) and propeller paragraph 2. > http://edburkhead.com/Ercoupe/index.htm > > Please do submit questions like this to the Coupe lists ( join via > http://www.ercoupers.com ) so you can get lots of answers including answers > from A&Ps, AIs and at least one person with some really good ERCO and FAA > records. > > Hope this helps. > > Ed Burkhead > http://edburkhead.com <http://edburkhead.com/> > ed -at- edburkhead???.com (replace -at- with @ and remove ???) > > > -----Original Message----- > From: Charles Waldo [mailto:[EMAIL PROTECTED] > Sent: Monday, May 16, 2005 9:25 AM > To: [EMAIL PROTECTED] > Subject: Ercoupe > > Ed > > I was wondering where I can find what the static rpm should be for a 46 > coupe upgraded to a c85 with a 69-50 prop? any ideas? I just had a pre buy > done on one. the compressions where 78,78,78,74, which is pretty good but > the static RPM was 2250.......I would think this might be a little > low....... > > Chuck > > > ---------------------------- > From: <[EMAIL PROTECTED]> > To: "Ercoupe Tech" <[email protected]> > Reply-To: <[EMAIL PROTECTED]> > Subject: Re: Re: [COUPERS-TECH] Engine RPM > > This guy is nuts and if were me, he would miss the fee. Folks don't charge that much for a Bonanza prebuy, so if he gave you something in writing, take him to task or maybe even the FAA or court. > ----- Original Message ----- > From: Charles Waldo > To: Ercoupe Tech > Sent: Monday, May 16, 2005 1:06 PM > Subject: Fwd: Re: [COUPERS-TECH] Engine RPM > > > ========================================================================== == == > To leave this forum go to: http://ercoupers.com/lists.htm > Search the archives on http://escribe.com/aviation/coupers-tech/ > > > > > > > -------------------------------------------------------------------------- -- -- > > > Yuck.....the engine in question is a C85-12F.....The part I love the best is the mechanic approved the buy and sent me a prebuy invoice for $500 bucks! Then you folks pointed out it had the wrong prop and I asked him about it....now he says your correct and its the incorrect prop.......he now says don't buy it.......I wonder what else he missed..... > > Chuck > > Note: forwarded message attached. > > > -------------------------------------------------------------------------- -- -- > > > ========================================================================== == == > To leave this forum go to: http://ercoupers.com/lists.htm > Search the archives on http://escribe.com/aviation/coupers-tech/ > > > > > > ---------------------------- > From: Richard Wilkens <[EMAIL PROTECTED]> > To: Charles Waldo <[EMAIL PROTECTED]>,Ercoupe Tech <[email protected]> > Reply-To: Richard Wilkens <[EMAIL PROTECTED]> > Subject: Re: Fwd: Re: [COUPERS-TECH] Engine RPM > > Chuck, > > My thought on it is if it has the wrong prop negotiate lower price or get > the seller to change to the correct prop. You may be talking $2,000 or > so. I would make sure his AP knows about it, so it will not pass annual > again until it's replaced. Remember your AP probability doesn't have the > FAA records so there may items installed that don't have correct paperwork. > > If you liked the Coupe enough to do a pre-buy, you must be interested in > it. The seller knows this too. You already have $500 in this one and > there is no guarantee that the next one you look at will be as good. I > guess I am saying how many times are you going to put out $500 looking for > the perfect Coupe. If you do it more than a couple of times you could have > gotten this one fixed and be flying. > > Yes, your AP may have missed finding issues, but I bet he believes the > aircraft is safe to fly. You miss things at work and so do I. There is > only one guarantee you can be sure of in aviation--airplanes cost big > dollars. This is just an introduction. My first annual cost me 20% of what > I paid for the Coupe and there wasn't much wrong with it. Expect to pay > three to four thousand dollars a year for the honor of being able to say > you own an Ercoupe. If it is only two thousand, put the rest away for the > year it will be five thousand. > > Good luck and let us know how it comes out. If you order a copy of the FAA > CD, would you send me a copy? > > Richard > N99904 > > > > > > ---------------------------- > From: "Barry Coates" <[EMAIL PROTECTED]> > To: <[email protected]> > Reply-To: "Barry Coates" <[EMAIL PROTECTED]> > Subject: [COUPERS-TECH] UNSUBSCRIBE [email protected] > > > > ---------------------------- > > > ========================================================================== == == > To leave this forum go to: http://ercoupers.com/lists.htm > Search the archives on http://escribe.com/aviation/coupers-tech/ > > > ========================================================================== ==== To leave this forum go to: http://ercoupers.com/lists.htm Search the archives on http://escribe.com/aviation/coupers-tech/
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