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


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