>> Doug, I have some questions after reading the Turbo Compounding
report.
>>
>> You say: "For ease of installing the unit near the front of the
rotary it is
>> best that the input
>> shaft and output shaft both turn in the same direction."
>>
>> Which end are you describing as the front of the rotary? Need a
more definite
>> term here as the
>> engine is oriented differently in pusher vs tractor planes.
Also, which shaft
>> do you mean by output
>> shaft? The engine output shaft or the turbine output shaft?
>>
>> Also, it is not clear to whether you are using just the
reduction drive from
>> the rotrex or the whole
>> unit including compressor as well.
>>
>> Thanks,
>>
>> Hans
>>
>>
> Hans
> Yes we do have tractor and pushers airplanes and that is why it
is less
> confusing to refer to engine part in the way Mazda designed it.
Flywheel and
> bell housing in the back, water pump on the front. Feel free to
clarify it
> by inserting (water pump side).
>
>
> Next I was speaking about the traction drive.
>
>
> It should read "For ease of installing the traction drive near
the front of
> the rotary ( water pump side) it is best that the traction
drives' input
> and output shaft both turn in the same direction as the engine e
shaft. That
> is clockwise when looking at the front of the engine.
>
>
> Hans just for your understanding the ROTREX traction drive would
not be used
> with the compressor attached. Another complete unit #C30-94 model I
> referred to might be used to boost the engine though.
>
> This traction drive part of the unit can only be used 'as is' if
it could be
> connected to a custom designed turbine rotating counter clockwise
as viewed
> from the front of the engine. On the particular design I have in
hand I
> don't think it is safe to try and modify it.
>
> Paul is trying to address this problem by making a completely new
traction
> drive taking the power off the planetary.
>
> The design of the 'final' custom turbine is a ways off but I have
noticed
> Horace Ho at in Taiwan has already been making and
> selling some nice
>
> " custom cast turbine wheels, NGVs for you, covering sizes from
55mm, 60mm,
> 66mm, 70mm, 90mm,130mm, and any sizes in between, you name it, we
build it.
>
> Here are what we have done for our customers :
>
> * Two different turbine wheels, a 55mm size,† and a 60mm
size, with
> redesigns for improving the blade's mechanical strength and
aerodynamic
> performance, so that it is near optimization.
>
>
>
>
> Thanks for catching the mistakes..
>
>
> Doug F.
>
> Doug, can that guy build them in Inconel?
>
Paul
Naturally.. They have their own vacumn furnaces.
Inconel 713 LC max temp just shy of 1700 degrees F. His company has
quite
an operation. I have been following his work for about a year now
Go here and click on 'Products'
I mistakenly thought all their turbine rotate clockwise. Actually they
rotate counter clockwise which is fine for the ROTREX traction drive.
Paul just brainstorming here. Horace claims his wheel is a
combination of
an axial, reactive. Probably more of an the axial.
If the two exhaust pipes are brought in with two nozzles where do
the hot
gas escape from? Assuming the gases have to actually through and around
right?
Here is recent email from Horace.
> Hi Doug,
>
> Thanks for your email, it is very interesting to receive project
supporters
> from all over the world. Yes for me, even a encouraging email is very
> supportive for me.
>
>> Most of your turbines rotate clockwise when looking at the front
of them.
>> I need one to rotate counter clockwise. Can you make them both ways?
>
> As for our 128mm wheel, the wheel is already counterclockwise as
looking at
> the front. Are you refering to a wheel rotates clockwise ? If so
I am afraid
> we won't be able to do that for you, as for the time being we are
very busy
> making bigger engines, one of which is a 200 lbs turbojet, and
the other
> 350lbs turbofan.
>> By the way you
>> might be interested in this technology to replace the gears on your
>> planetary drive. Go here for their website.
http://www.rotrex.com/
>
> We can make the gears by ourselves, accompaying our upcoming twin
spool
> turbofan project there is a turboprop engine using the same core,
we will
> make the gears by then. I am very happy because our turbofan
engine is still
> in early stage of development but already have prospect buyers
enquiring the
> details.
>
> Keep in touch,
>
> Regards,
>
> Horace.
Paul,
OOPS I was wrong again. For going into the front of the engine it
looks like
the it won't work with the ROTREX either. Wrong input direction.
Doug in Japan
----------------------------------------
I think the melting temp of Inconel is 2600 F.
BTW for people reading this we will not need a turbine rotating
in the opposite direction if the traction drive I am building
works.
Paul Lamar ...No rotor no motor.
-------------------------------------------
Didn't Williams already tried to do that?
Clifton
-------------------------------------------
Nothing at all to do with it.
Paul Lamar
---------------------------
Huh? I, was refering to the 200 pound turbojet.
Clifton
----------------------------------------
Oh you mean what Doug is talking about.
That has nothing to do with rotaries. Doug is talking
about using one of their turbine wheels as a blow
down turbine I think.
Paul Lamar ...No rotor no motor.
-------------------------------------------------------------
Doug,
Just a thought...why not use an intermediate gear between a standard
clockwise radial turbine and the rotrex box? All it would take is two
spur gears, one on each shaft, at a simple 1:1 ratio. You could probably
find suitable gears over the counter -- there is not much power transfer
involved.
Btw, thanks for the links to that small turbine maker. Very interesting.
I've been interested in small turbines for RC applications for some time
and these engines are getting bigger all the time -- and moving to
full-scale aircraft. I know of one guy who mounted a couple of
20-pounders (I believe) on a retracting mechanism on his sailplane.
Apparently it's enough to get him rolling and airborne.
Now this guy with his 200-pounders...nice.
Regards,
Gordon.
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