Don Bedwell,

    Don did you get the stp file for the rotor housing?
    What do you think?

    Paul Lamar

    Paul,

    I have received many things in the last two days but I don't believe I have
    seen this. Who sent it?

    Don

    I did. Here it is again.

    Paul Lamar


    Thanks!

    Did you design it? Is it the latest version that Mr. Lin is using?

    Mazda designed the rotor housing. They cost about $400 new from your local
    Mazda dealer.  One of our subscribers did the 3D model. Yes it is the rotor
    housing Charles Lin is using.

    I have others as well.

    Here is just the end housings less the rotor
     housings.
    These are incomplete but useful for components inside cowl 3D's.

    I also have an aluminum version of just the back end housing.

    Paul Lamar



    Paul,

    I am trying to get just what Charles wants me to do. Will you send me any
    and all of the solids that you might have for the EzyCopter airframe and
    existing design with engine plus any other rotary models that you might
    have?

    Don Bedwell

    I have no solids for the EzyCopter airframe.
    I am sure Charles has some or perhaps just 2 D drawings.

    I did some aluminum end housing for Charles and he has them.
    His property.

    The main problems are building up a one rotor engine, installing
    the engine in the airframe and test flying it. Do you have an airframe
    or can you build one? If not Jerry Hey can help.

    Paul Lamar


Hey all,

Just to note on the rotor housing part file. I have found some errors in
the surface that will cause huge problems if someone tries to use this
for machining. The rotor housing surface is not a series of
discontinuous curves. The dimensions should be 240mm and 180mm if there
was no offset and 246mm and 186mm with an offset. I don't have a housing
to measure but I am pretty sure that a Mazda 13b engine uses a offset
rotor housing surface and a non offset rotor surface. This means the
dimensions should be 246mm x186mm. By offset I mean a=3mm.  Maybe that
is why the tension bolt holes don't look centered in the water channels.
If this is wrong then the rest needs to be view with skepticism.

Rob Woods

I don't think it was intended to machine rotor housings Rob.
It was/is cheaper just to buy what Mazda offers.

Paul Lamar

Rob,
Intent in performing the exercise, was to have an accurate model of the
rotor housing for modifying existing Mazda housings, not for manufacturing
new housings from scratch (but I could get them accurate enough for
that....). If you would care to do your math and use a CMM, you will find
the rotor internal dims are actually within .005" in all areas of the model
referenced to the actual part. The arcs used to represent the housing
internal area were used as this was done in SW2008 and it did not support
using equations for curves.
The water hole offset appearance is actual in the part (and not an illusion,
as the minor errors in the inner surface are not enough to cause an
illusion), and all positions are located within the accuracy of the CMM. All
external areas are also quite accurate.
So before you bash.... do your homework, as I had no requirement to provide
these models to the group.
Merry Christmas,
Larry

Larry,
Beautiful work mate!
I know how hard it is to get the parts onto drawings, and yes indeed! the
bolt holes aren't centered to all the mounting points because just in making
the moulds, some accuracy is lost, to a small degree. To sum this up to get
it perfect is bloody near impossible!!

I must say however that's the best drawing I've seen, and I assume it took a
long time to get the final outcome - your to be congratulated. I know I
couldn't do it with my basic CAD drawing skills. Hopefully mine will improve
in time.
George (down under)