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Vendors Corner => Aero Products => Topic started by: Jimmy R. Jacobs on July 08, 2011, 09:01:59 PM
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What is the power difference, more, less, or the same, on a pipe or a header muffler on a 40 PA Merlin Light? The reason I'm asking this question is that I need a touch more power because my lap times are a little slow where the engine is happy. The lap times are 5.4 to 5.4+ where it's happiest on 61 foot lines. Engine runs great, 2-4 run. The engine prop is a APC 11-5.
Fuel is Sig 10-10-10 plus 1 oz. of Aero 1 and 1.3 oz of castor added.
RPM is 88-87 where engine is happy and runs super good.
Our altitude is 5,300 feet.
I'm going to try Sig 15-10-10 plus the above additions tomorrow. So, what do I need to get a little more power or do I need a PA 51? (By the way, I'd love to have one! Does it look like you'll have them back any time soon? I have two 40s I bought from you.)
Thank you ahead of time for the information-
Jimmy Jacobs
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What is the power difference, more, less, or the same, on a pipe or a header muffler on a 40 PA Merlin Light? The reason I'm asking this question is that I need a touch more power because my lap times are a little slow where the engine is happy. The lap times are 5.4 to 5.4+ where it's happiest on 61 foot lines. Engine runs great, 2-4 run. The engine prop is a APC 11-5.
Fuel is Sig 10-10-10 plus 1 oz. of Aero 1 and 1.3 oz of castor added.
RPM is 88-87 where engine is happy and runs super good.
Our altitude is 5,300 feet.
I'm going to try Sig 15-10-10 plus the above additions tomorrow. So, what do I need to get a little more power or do I need a PA 51? (By the way, I'd love to have one! Does it look like you'll have them back any time soon? I have two 40s I bought from you.)
Thank you ahead of time for the information-
Jimmy Jacobs
Hi Jimmy
I have been away at the US NATs, the Merlin 40 will be plenty of power for the plane, you can add nitro, up the pitch slightly, go to a better , more efficient prop, open the venturie, or do any of the above to tune the run to fit the plane
Randy
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Thanks, Randy hope you had a good time . I think I new all this but , wont to check. The 15% nitro did help alot.
Jimmy Jacobs
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Thanks Randy. I used 15% fuel, 11-11 oil and 1 oz of your snake oil. I need to go to longer lines now, maybe 62'. I also added tip weight, up to 1.8 oz. Flying great. Engine runs great, plenty of power now. Engine has 2 hours bench time break in and 40 flights, so engine may not even be broken in yet. What do you think?
Thanks, Jimmy
PS- PA 40 are great engines; still need a PA 51.