DaveLeonard wrote:

Here is an Excel spreadsheet I got off the web and modified

for aircraft

use.  Lots of good info including p/r, corrected mass flow,

temps, power

potential, intake velocity etc.  Easy to use.

Dave Leonard

Dave

Thanks for the work,
I have been playing around with it trying to get some basic numbers.
Trying to get an idea  how much power is in the exhaust.

Two questions. Does data sheet assumes we are burning mogas?
Are the BSFC datum reversed?  I notice the HP goes up as the BSFC gets
lower.

Thanks

Doug in Japan

Doug, I didn't make most of the sheet, I just found it online so I can't
vouch for all the accuracy, but it seems reliable.  Yes, I'm sure it assumes
MOGAS as it was made for cars, although I'm not sure where matters here.
Power and BSFC should be essentially unchanged, some say better for the
MOGAS but I don't think enough to matter here.

As for the BSFC, I think it works like this:  It has calculated the mass of
air, and you have input your fuel/air ratio giving a fixed amount of fuel
and air used.  Therefore, decreasing the BSFC (improving it) will increase
the amount of power derived from that fixed amount of fuel.

Dave Leonard

 
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