---------------------------------------------------------- KIS-List Digest Archive --- Total Messages Posted Mon 03/14/11: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 03:45 AM - Re: KIS TR-1 Propeller (BlueSkyFlier) ________________________________ Message 1 _____________________________________ Time: 03:45:01 AM PST US Subject: KIS-List: Re: KIS TR-1 Propeller From: "BlueSkyFlier" Chuckle chuckle ... [Laughing] Hi Galin. I was thinking of you when I did the write-up because I did previously say to you that a 3-blade prop is rarely if ever better than the 2-blade -- that statement still holds if both prop types have the same pitch. In such case the one advantage of the 3-blade is that the lower power loading per blade reduces the lift coefficent on the blades. Therefore the 3-blade stops cavitating (starts to 'bite' properly) at lower forward speed than a 2-blade generating the same thrust. Takeoff acceleration therefore benefits. The price to pay for that benefit is the higher parasitic drag of the 3-blade prop. In any case, reducing the propeller pitch is what really makes the difference and is essential to release the extra RPM needed to tap into the top end of the 'full throttle' curves at any % remaining power. The parasitic drag penalty is offset by reducing the diameter accordingly. One important observation from these studies is that steeply banked turns should be given a wide berth in the KIS TR-1 if you have less than 130 hp up front coupled with a propeller pitch in the high 60"s. Anything more than 55 degree bank has the potential to really spoil you day - and everyone else's too. [Bonbons for those who spot the obvious little booboo in two of the labels on the diagram :o)] Cheers, Alfred -------- _________________________________________ Read this topic online here: http://forums.matronics.com/viewtopic.php?p=333836#333836 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message kis-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/KIS-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/kis-list Browse Digests http://www.matronics.com/digest/kis-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.