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RV-List: Clocking the prop. Real world data

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randy(at)romeolima.com
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Posted: Tue Apr 17, 2007 7:20 am Post subject: RV-List: Clocking the prop. Real world data

Wow Mike, great info!!!  I've long been curious about  prop clocking but there are some obstacles to just trying it as you ran into  with the crank flange bosses. Of course you're working on a  6-cylinder where most of us are flying 4-cylinders. Anyone out there want to do  some prop clocking experimentation with an O-360?

  

 If anyone in the Northwest wants to try some clocking  experimentation I can assist with the measurement. Our EAA chapter has a DSS  Micro MicroVibe II balancer.... http://www.eaa105.org/Programs/programs.htm#PropBalancing

  

 Best,

 Randy Lervold

  

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dan(at)rvproject.com
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Posted: Tue Apr 17, 2007 8:46 am Post subject: RV-List: Clocking the prop. Real world data

Randy, you might find this  interesting:

  

 http://www.rvproject.com/m20j/pdfs/service_bulletins/sbm20-206.pdf

  

 On my last Mooney, I flew behind an IO-360-A3B6D.  What made it an  -A3... vs an -A1... were the reindexed prop  flange bushings, and thus the clocking of the prop (per the SB listed  above).  That was one very smooth engine, but I can't say I had the  opportunity to fly it before the conversion was done.

  

 The -A1B6 I have in my RV-7 had notable vibration early on, but after  I broke it in, I had it dynamically balanced by Jim Fackler to 0.01  IPS (http://www.rvproject.com/20040427.html).   While I did originally consider converting my -A1B6 to an -A3B6, it didn't end  up being necessary in the end.  The dynamic balance took care of it.

  

 Kahuna, I assume you dynamically balanced the prop before diving into the  reclocking project?  I didn't see any notes about that on your site.

  



 )_( Dan

 RV-7 N714D

 www.rvproject.com / www.weathermeister.com

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