Paul, would using a CO2 bottle and spray bar be effective in cooling
   the time to climb heat exchangers?

   Ray Hellstrom

   I never tried that. I assume it works better than a cold water spray.
   We have a ten gallon tank and a 100 psi pump for intake water
   injection and we planned to also use that for spraying cooling water
   on the cross counter flow heat exchanger.

   How much CO2 would we need for one minute and how much would  it
   weigh? The pressure tank sounds heavy.

   Paul Lamar

   Paul, I'm not sure how long it would run as I not up on the calculations for the delta temperature would be but I see a five pound capacity bottle weighs eight pounds. There are 2.5 pound tanks but again not knowing the amount needed I couldn't advise on it. CO2 is cheap and safe unless punctured.

   Ray Hellstrom



The CO2 would not be needed right at the flight start.
Probably half way through which would reduce the amount
needed. Flow rate would be high as compared to N2O due
the number of nozzles required. A couple of N2O nozzles
in the radiator intake from 4 barrel systems might do it.
N2O and CO2 both give good cooling due to the temperature
drop when released. Fogger nozzles would cool the complete
radiator air intake. Keep the CO2 away from the engine intake
air.

Dale Davies


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