Paul,

  I'm starting to model a rotary in my spare time, and I am in need of some
  accurate dimensions for the 13B and/or RENESIS engine.  I've drawn the
  trochoidal housing and rotor shapes from Yamamoto's equations and numbers
  published in his book, but I don't have an example around that I can
  measure for the other dimensions.

  What I need mostly at this point are critical dimensions like rotor
  housing depth, center housing depth, thickness of the rotor housing
  wear surfaces, locations/spacing of the tension bolt holes, major
  e-shaft dimensions, stationary gear height and diameters, and so
  on...

  My purpose is to design new housings and possibly rotors that can be
  used with the mazda e-shaft, gears, bearings, etc.


  I've seen pictures of your models... are they detailed to this
  level, or are they mostly just for mock up?


  Josh

  I have a iges of a rotor housing. Can your email handle a zip file?

  Paul Lamar


  Yes, zip is just fine.

  Josh


  Here it is.

  Paul Lamar

  Hi Josh

  I have extensive V5 background with aero design and have thought about
  doing something similar.  Will your final models be for your use only or
 is
  their some possibility for sharing?  Just don't want to duplicate the
  effort.  Will exterior surfaces and interfaces be accurately modeled?
  (plus/minus .030)

  Creating new housings (please make some RB aluminum housings for half
  price...I will be happy to buy) is interesting  but my current main goal
  would be to create a firewall forward DMU (digital mock up) for EBU
 (Engine
  Build Up) purposes.  The aircraft will be an RV7A (have it but it is still
  in the crates).  Once this is created and appropriately parametrized I can
  run thru multiple scenarios of  different EBU configurations as well as
 get
  some idea of engine location vs weight/balance impact which would aid in
  mount design etc...

  Thanks,

  Kent Baxter
  Contract Design engineer (Aerospace) presently OTR (on the road)

 Kent,

 It wasn't my intention to duplicate Mazda housings, but to create
 models for new parts that will work with other Mazda parts.  If we can
 come up with something to compete with the RB housings, that'd be
 great.  I also intend to attempt a design of some rotor housings,
 possibly with replaceable friction surfaces, but I haven't really
 thought into it too much.  I'm more than happy to share what I come up
 with with a sort of honor system license... If you sell anything based
 on what you get from me, throw something my way.

 I was also a contract engineer until recently.  I went direct with the
 company I was contracting through for GE.  My work has mostly been in
 Wichita and Middle River, MD.  I'm currently back in Wichita.

 Josh


 Josh, Did you get the zipped IGES of the rotor housing I sent?

 BTW do you or anybody else on here know anything about the HP
 capability of J section belts at 6000 RPM?

 Paul Lamar


Paul,
It depends on the number of ribs of course, but Gates has charts for them.
Go ti the Gates web site and search Micro-V. J section is fairly small. K
might be better for power transmission.
Bill Jepson

I did but I found no engineering manual. They wanted me to contact them
and they wanted a bunch of info. If you have a pdf please email it.

The only thing I could download was this chart.
I want to operate in the red box so I know I need a J section.
What about pulley diameters for that range?

Paul Lamar

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