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Attched is a HTML file for those who can't open an Excell file
Bill
From: "WILLIAM BIGGS" <[EMAIL PROTECTED]>
Reply-To: "WILLIAM BIGGS" <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
CC: [email protected]
Subject: RE: FW: [COUPERS-TECH] RPM results so far
Date: Tue, 28 Feb 2006 20:57:09 -0600----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]----
Attached are RPMs submitted so far
Bill
From: "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 "???")
>
>
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ErcoupeRPM.xls
Description: MS-Excel spreadsheet
|
C75 |
1950-2100 |
2275 |
Prop |
|
|
Name |
Static RPM |
Cruise |
Max |
|
|
Larry Snyder |
2000 |
2350 |
1B90 73-51 |
|
|
C85 |
2025-2225 |
2575 |
Prop |
|
|
Name |
Static RPM |
Cruise |
Max |
|
|
Syd Cohen |
2120 |
2450 |
2575 |
|
|
Roger Anderson |
?? |
2300 |
2325max |
73-51 |
|
Roger Anderson(REPITCHED) |
?? |
2400-2500 |
2525 |
71-78 |
|
Ed Burkhead(C85 "Modified") |
2225 |
2400 |
2600 |
71-46 |
|
Russ Whale (C75 Converted) |
2000 |
2550 |
76-46 (Sens 76-ak-2-46) |
|
|
" " " |
2000-2500 |
Beech Roby |
||
|
C90 |
2250-2375 |
2475 |
Prop |
|
|
Name |
Static RPM |
Cruise |
Max |
|
|
Don Bowen |
2350 |
2400 |
2575 |
