---------------------------------------------------------- Kolb-List Digest Archive --- Total Messages Posted Sun 09/21/08: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 04:51 AM - 447 tuning tips (Richard Girard) ________________________________ Message 1 _____________________________________ Time: 04:51:43 AM PST US From: "Richard Girard" Subject: Kolb-List: 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 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message kolb-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Kolb-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/kolb-list Browse Digests http://www.matronics.com/digest/kolb-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.