---------------------------------------------------------- KIS-List Digest Archive --- Total Messages Posted Mon 02/28/11: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:09 PM - Re: KIS TR-1 Propeller (BlueSkyFlier) 2. 05:27 PM - Re: 2010 Holiday trip (BlueSkyFlier) ________________________________ Message 1 _____________________________________ Time: 05:09:56 PM PST US Subject: KIS-List: Re: KIS TR-1 Propeller From: "BlueSkyFlier" Hi OC, Thanks for the info on your propeller performance. Using the integrated airframe and propeller performance model which I created some weeks ago now, I have already determined that the best solution for me will be a 67 x 67 prop. Such propeller will also function optimally at 2300 rpm at 7500 feet for cruising. According to Lonnie the P-tip with 67 inch pitch will flex to such an extent under load that it will effectively present a 63 inch pitch during take-off/climb. By the way, I found it puzzling that the Prince website talks about the propeller diameter being a factor in the flat plate drag of the aircraft. Because the propeller produces netto thrust which increases quadratically with diameter that statement initially failed to compute in my mind. On the other hand however, propeller parasitic losses do increase with diameter and rpm - so perhaps they are implicitly lumping propeller parasitic losses into the overall zero lift drag coefficient for the aircraft (and thereby also into the flat plate area). I have not encountered such point of view before, but it is the only interpretation which makes sense to me. One has to be very careful with that approach though, because the airspeed multiplier by which drag converts into power is of course completely different for the propeller and airframe. It remains to obtain torque and thrust curves for a 67 x 67 propeller from Lonnie Prince and his team to confirm that my postulated propeller blade model is not too optimistic in terms of performance - nor too conservative. Kind regards, Alfred -------- _________________________________________ Read this topic online here: http://forums.matronics.com/viewtopic.php?p=332343#332343 ________________________________ Message 2 _____________________________________ Time: 05:27:37 PM PST US Subject: KIS-List: Re: 2010 Holiday trip From: "BlueSkyFlier" Hi John (Jackson), My closest field is Fairoaks, but the plane is still at Dunkeswell where I bought it and am doing conversion training if the weather will give us a chance. Regards, Alfred -------- _________________________________________ Read this topic online here: http://forums.matronics.com/viewtopic.php?p=332347#332347 ------------------------------------------------------------------------------------- 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.