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


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Time: 
07:59:58 AM PST US
From: 
John C Black <john@jcblack.com>
Subject: 
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


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Time: 
03:05:55 PM PST US
Subject: 
Re: Ragwing Ultra-Piet
From: 
"cdlwingnut" <lee_chad@hotmail.com>
      
      
      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
      
      








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