Thread: smoke oil
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  #13  
Old March 5th 04, 07:15 PM
nametab
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It's a turbine, so can't change the RPM! The measured temperature at the
injection point is at least 450C and up to 600C, so I wonder what the flash
point difference between 250f and 400F would have. Will check the flash
point of the stuff I'm using. I'm also using quite a lot of diesel to make
it flow; about 1/3. It does make cool smoke when the flow goes through the
Fenestron... but in a hover it just gets defused by the rotor wash.

"Andrew Boyd" wrote in message
m...
"nametab" wrote:

How much volume are you trying to push through there. We are up to

almost
1gal/minute and getting fair smoke, but with the rotor downwash, it

defuses

The volumn of smoke oil you can pump through depends upon the
volume of your exhaust gas. A bigger engine, or running at a
higher RPM (or both) will usefully allow a higher smoke oil
volume.

For a big piston engine (eg 540 cubic inches) 1 gal/min should
give very good smoke, with the right smoke oil. Check the
flashpoint of your oil - betcha it's up around 400F. You'll
get better smoke with a (CoC) flashpoint of 250F.

As far as dealing with rotor downwash, you're on your own! I
don't know nothin' 'bout fling wing :-)

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