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


This is a pretty detailed model, how did you measure hole locations,
etc?  I guess what I'm wondering is if it is accurate enough to use as
gospel.

Josh


Probably not. I would check the dims.

Paul Lamar

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