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RPM vs MP

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mr.sun

Joined: 30 Jan 2007
Posts: 85

Posted: Thu Feb 01, 2007 7:11 pm Post subject: RPM vs MP

Anybody have a source for a very detailed chart showing RPM and Manifold pressure settings for a IO-360 and Hartzell C/S prop?   The books for both Lycoming and Hartzell don't have what I'd like to keep in my RV-7.   Greg

  [quote][b]

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Greg RV-7

pilots2(at)yahoo.com
Guest

Posted: Thu Feb 01, 2007 8:43 pm Post subject: RPM vs MP

Greg,



I was in the same boat a little over a year ago when we first began flying our 7A (IO360 / CS prop).  The book that came with the engine (new from Aerosport) had graphs in them but they were so small as to make them virtually unreadable and useless.  I called Lycoming and they sent me a 8 1/2 x 11 blow-up of the power chart.  After several hours of magnafying glass and ruler interpolations

I was able to WAG  25"/2500 as a takeoff power setting and I run 22"/2400 cruse which gives me about 10GPH. 



If anyone has a better chart I would like a copy also.



Reuven

N7WT

KSEE

Greg Williams <mr.gsun(at)gmail.com> wrote:[quote] Anybody have a source for a very detailed chart showing RPM and Manifold pressure settings for a IO-360 and Hartzell C/S prop?   The books for both Lycoming and Hartzell [quote][b]

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Kellym

Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ

Posted: Thu Feb 01, 2007 11:49 pm Post subject: RPM vs MP

I guess I don't understand your settings. There are two versions of 

Lycoming IO360, with many variants, 180 and 200hp. AFAIK both are rated 

at 2700 rpm. My -A1A engine is 200hp at 2700 and 29 inches for takeoff, 

and once I am above safe altitude I reduce to 2600 for cruise climb. 

Cruise at 2500 and 24" normally. You might want to talk to Hartzell, as 

most of their props on the versions of the engine without dynamic 

counterweights have rpm restrictions in th 2000-2350 range. The Cardinal 

and Mooney versions, -A1B6 or A3B6 are the counterweighted version 

cranks that reduce the rpm restrictions at cruise rpms, but add some at 

low power settings below 15".



Reuven Silberman wrote:

 	  Quote: 	
		   Greg,



 I was in the same boat a little over a year ago when we first began 

 flying our 7A (IO360 / CS prop).  The book that came with the engine 

 (new from Aerosport) had graphs in them but they were so small as to 

 make them virtually unreadable and useless.  I called Lycoming and 

 they sent me a 8 1/2 x 11 blow-up of the power chart.  After several 

 hours of magnafying glass and ruler interpolations

 I was able to WAG  25"/2500 as a takeoff power setting and I run 

 22"/2400 cruse which gives me about 10GPH.



 If anyone has a better chart I would like a copy also.



 Reuven

 N7WT

 KSEE

 */Greg Williams <mr.gsun(at)gmail.com>/* wrote:



     Anybody have a source for a very detailed chart showing RPM and

     Manifold pressure settings for a IO-360 and Hartzell C/S prop?  

     The books for both Lycoming and Hartzell



     *

     *

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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD

pilots2(at)yahoo.com
Guest

Posted: Fri Feb 02, 2007 10:18 pm Post subject: RPM vs MP

I should have been a little clearer.  Ours is the 180hp model and after a full power takeoff my climb power setting is 25" / 2500RPM.  I get about the same takeoff power as you do.  Without the charts in front of me I believe the RPM restrictions are dependent on having a low MP and come into play when you reduce the power for approach and landing. 



Reuven



Kelly McMullen <kellym(at)aviating.com> wrote:[quote] --> RV-List message posted by: Kelly McMullen 



I guess I don't understand your settings. There are two versions of 

Lycoming IO360, with many variants, 180 and 200hp. AFAIK both are rated 

at 2700 rpm. My -A1A engine is 200hp at 2700 and 29 inches for takeoff, 

and once I am above safe altitude I reduce to 2600 for cruise climb. 

Cruise  at 2500 and 24" normally. You might want to talk to Hartzell, as 

most of their props on the versions of the engine without dynamic 

counterweights have rpm restrictions in th 2000-2350 range. The Cardinal 

and Mooney versions, -A1B6 or A3B6 are the counterweighted version 

cranks that reduce the rpm restrictions at cruise rpms, but add some at 

low power settings below 15".



Reuven Silberman wrote:

[quote] Greg,



 I was in the same boat a little over a year ago when we first began 

 flying our 7A (IO360 / CS prop).  The book that came with the engine 

 (new from Aerosport) had graphs in them but they were so small as to 

 make them virtually unreadable and useless.  I called Lycoming and 

 they sent me a 8 1/2 x 11 blow-up of the power chart.  After several 

 hours of magnafying glass and ruler interpolations

 I was able to WAG  25"/2500 as a takeoff power setting and I run 

 22"/2400 [quote][b]

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