Kolb-List Digest Archive

Sun 09/21/08


Total Messages Posted: 1



Today's Message Index:
----------------------
 
     1. 04:51 AM - 447 tuning tips (Richard Girard)
 
 
 


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    Time: 04:51:43 AM PST US
    From: "Richard Girard" <aslsa.rng@gmail.com>
    Subject: 447 tuning tips
    Mike, John, all, I regret leaving out HP when I said the engine must reach full RPM. Look at the graphs in the operators manual and you see that the engine develops its peak HP at 6500 RPM and this is what must be achieved at WOT, not 6800 RPM as Mike interpreted my remarks. This is also reflected in SI 3UL - 89E. The graphs here are directed at various problems that occur when the prop is not matched to the engine so that it reaches "nominal RPM" at WOT.Back to the graphs in the Operation Manual. John says he is getting 6100 RPM WOT in level flight. I would guess he is seeing 5700 to 5800 RPM in climb. This represents an 8 to 10 per cent loss of horsepower. Why on earth would you want to tune for that? Sort of like running the engine with one arm tied behind its back :-} John, I've never had dealings with Ronnie Smith at South Mississippi Light Aircraft but he comes highly recommended by John H and others here on the list. Give him a call and describe your symptoms. I'll bet you a quarter he'll tell you your prop pitch is too steep. Rick




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