Water Injection Question

In article ,
Scott Skylane wrote:


In the piston (large radial) world,
a water/alcohol mix is injected just downstream of the carburettor for
hight power operation. This has the effect of reducing combustion
chamber temperatures, thus allowing higher manifold pressures (i.e. HP)
without detonation.

Scott,

Are you guys using ADI on the -6?

And congrats on making First Officer!!

--
Dale L. Falk

There is nothing - absolutely nothing - half so much worth doing
as simply messing around with airplanes.

http://home.gci.net/~sncdfalk/flying.html

"Don Hammer" wrote in message
...
A jet engine produces thrust by the amount of mass it can push out the
back end. By injecting water you have increased that mass and the
thrust increases without a cooresponding increase in internal
temperature.

Ooo, a steam engine!

Paul

"Paul Sengupta" wrote in
message ...
"Don Hammer" wrote in message
...
A jet engine produces thrust by the amount of mass it can push out the
back end. By injecting water you have increased that mass and the
thrust increases without a cooresponding increase in internal
temperature.

Ooo, a steam engine!


PW, GE and Honeywell and going to merge with Stanley.

Thanks for all your replies. I understand it now. On the older big radials
equipped with some form of pre-charging, the charger itself would heat up
the air as it compresses it and have effect on the detonation point. Now it
makes sense

Triple Delta

Dale wrote:
/snip/
Scott,

Are you guys using ADI on the -6?

And congrats on making First Officer!!


Dale,

Yes, we use it, generally for takeoffs above about 85,000 lbs. If
anyone's interested the fuel burn for an R2800 CB-16 is as follows:

Max Dry power (53" M.P. 2800 RPM 1950 HP) 1850 lbs/hr

Max Wet power (59.5" 2800 RPM 2400 HP) 1550 lbs/hr

And thanks for the congrats!! It sure beats working for a living

Happy Flying!
Scott Skylane