Jerry Hey wrote:

Paul,

Seeing Richard Sohn's  report on the single rotor in which he achieved
an acceptable idle with a six inch intake forces me to the conclusion
that I need a test stand badly.
  Granted a test stand is a long way from a dyno, but still a lot of
intuitive data can be gathered.  We can observe static rpm performance
with different length intakes for example.

What I am looking for is a simple, cheap  stand that I can test run my
engine on.  I am hoping that someone has already designed this and has
some practical experience running an engine with prop  on the ground.
Can anyone provide a schematic of what a test set up would look like.
Where is the fuel.  the instrument panel,  etc.   I have  plenty of
room next to my shop and could easily build a shed roof over the test
set up.

Richard Sohn, come to think of it, must have a test stand.   Maybe Lynn
does too.  Tracy?   Photos, plans, advice?   All would be appreciated.

Thanks,  Jerry

It is almost as easy to make a dyno as it is to make a test stand.
This would be a pieces of cake for you. You don't really need to measure
the trust. That is handy to test props but not really necessary.

You did just get that message I just sent did you not?

Everett Hatch used this type of dyno and I think Power Sport still uses it.

Paul Lamar

Jerry, This is what Richard Sohn is using for a prop dyno load. It is an industrial
fan with adjustable blades. You can also add and subtract blades to
increase or decrease the load on the engine. Very good idea and cheaper
than a prop. Or you could use 3 or more Warp drive blades.
Or you could carve your own crude prop as the efficiency of the prop
has nothing to do with the load on the engine. Laminate it out of six
clear white pine 1 by 8 boards.

Paul Lamar
 
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