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"Lippsing" a Q-tip propeller
On Apr 17, 2:59 pm, "Capt. Geoffrey Thorpe" The Sea Hawk @See My
Sig.com wrote: Removing weight from the tip will change the blades natural resonant frequencies. The less metal you remove, the less you are going to change them, but do you know how much room you have between the engine firing order frequencies and the current resonant frequencies of the prop? I see a fair amount of risk for not much (if any) gain. Every certified prop has a Type Certificate Data Sheet, and that sheet will specify maximum and minimum diameters for particular engines. The info is there so it's not necessary to go kill oneself learning it all over again. Here's the TCDS, for example, for the McCauley 1C160 prop used on many 172s: http://www.airweb.faa.gov/Regulatory_and_Guidance_Library%5CrgMakeModel.nsf/0/A2153BC309BE73C0862571A800643E15/$FILE/P-910.pdf For instance, it says that for a Lyc O-320, 150 hp @ 2700 RPM, the max is 75" and the min is 74". So you would go he http://www.airweb.faa.gov/Regulatory...e?OpenFrameSet and look up your Hartzell model and see for yourself. Dan |
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