12 b
Mounting it on the back would
be easier.
Paul Lamar
Yeah, that looks like a more sensible way, particularly if I go the single rotor
route, there can be extra shaft available.
Did not hear back from R. Sohn, so I guess he's not interested in making single
rotors for others. Any chance you can
send a drawing how to modify the E-shaft for a single?
When I get the turbine, I will do the math and figure out what kind of a gear box
I'll need. After mulling it over a direct couple would be too inefficient.
Craig Smith
That gives you a nice long shaft sticking out the back for blow down turbine.
we need to find some one with a good dyno to measure the BSFC.
Paul Lamar
Paul,
I am in China until the middle of January. When I return, I can get a shaft modified
for you guys.
Larry Childs
Great Larry.
We need some one to build a PT6 type dyno to measure the BSFC.
All PT6s read out prop torque.
That measures the torque by measuring the thrust of the axial sun gear
in the gear box.. And of course HP = T X RPM/ 5252.
To get the BSFC then all you need do is measure the fuel burn.
That would convince a lot of people that recovering some
of those hundreds of waste horsepowers in the exhaust would lower
the fuel burn.
Paul Lamar
The best way to determine the improvement made by turbocompounding is to measure
output torque on a dyno. A good test cell will have a fuel flow meter, so you could
calculate the BSFC as well. However, you could also do this on an airplane fairly
easily. You could install an inline torque meter on the output shaft of the engine or
simply instrument the shaft itself. For the latter option, you would need strain
gages, an appropriate DAQ system and a slip ring assembly. This is commonly done in
industry so it's a fairly straightforward job. Here's a good overview of how it works:
https://measurementsensors.honeywell.com/techresources/appnotes/Pages/Ways_to_Measure_the_Force_Acting_on_a_Rotating_Shaft.aspx
Plumbing a fuel flow meter on an aircraft is easy too.
Fuel flow meter:
https://www.emerson.com/en-us/catalog/micro-motion-elite-coriolis
Inline torque meter:
https://www.hbm.com/en/2384/t22-torque-transducer-for-simple-torque-applications/
Hakan. Uras
No question that a dyno would be better. Do you have access to a dyno at your
Michigan university?
Are you willing to test a one rotor turbo compound engine?
It is too expensive out here in California. It cost $750 a day and it is time
consuming to set it up.
I doubt the local college has a dyno.
Using the torque out put like the PT6 is the cheapest way to do it. Also rapid tuning
changes can be read out immediately while actually flying.
Here are some 3D's of the one rotor turbo compound.
BTW does anybody on here know why Ron Grable died?
Paul Lamar
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