---------------------------------------------------------- Pietenpol-List Digest Archive --- Total Messages Posted Fri 07/13/18: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 07:59 AM - Ford Crankshaft Choice (John C Black) 2. 03:05 PM - Re: Ragwing Ultra-Piet (cdlwingnut) ________________________________ Message 1 _____________________________________ Time: 07:59:58 AM PST US From: John C Black Subject: Pietenpol-List: Ford Crankshaft Choice I am building a Ford Model B engine for my Piet. I want to know what RPMs the engine will usually run at ?? I have an early 1932 crankshaft that looks like a Model A crank with bigger main bearings no counterweights. I also have a 1934 crankshaft that has cast counterweights. It weighs about 12 pounds more. Which should I use ? I think the engine needs to run smooth minimum vibration. The counterweighted crank would be smoothest. The 1932 crank without counterweights will vibrate a bit, but there will be RPMs at which a harmonic vibration will be greater. I have a model A car with a crank without counterweights. I think a good test would be to run its engine at the RPMs that are commonly used in flying a Piet. If it is smooth, I think it is a good indication the harmonic vibration will not be serious at the required RPMs. and Ill probably use the 1932 crank without counterweights. Bernard Pietenpol preferred engines with this crank. What RPMs do Model A Piets mostly use when flying ? John ________________________________ Message 2 _____________________________________ Time: 03:05:55 PM PST US Subject: Pietenpol-List: Re: Ragwing Ultra-Piet From: "cdlwingnut" Been working on the little piet here and there. The landing gear is coming along. The torque tube and controll stick is completed and installed. Lots of varnishing. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=481640#481640 Attachments: http://forums.matronics.com//files/20180713_130237_resized_140.jpg http://forums.matronics.com//files/20180713_125353_resized_156.jpg http://forums.matronics.com//files/20180713_125409_resized_136.jpg http://forums.matronics.com//files/20180711_155745_resized_130.jpg http://forums.matronics.com//files/20180626_143631_resized_724.jpg http://forums.matronics.com//files/20180619_170220_resized_142.jpg ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message pietenpol-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Pietenpol-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/pietenpol-list Browse Digests http://www.matronics.com/digest/pietenpol-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.