>  Paul,
    >  A BTU is a measure of energy.  Power would be BTU per unit of
   time.  1
    >  BTU  =  778 ft-lb
    >
    >  So, 1 BTU/hr  =  778 ft-lb/hr  =12.97 ft-lb/min  =  3.93 E -4
   horsepower
    >
    >  Inverting this we get:   2545 BTU/hr  =  1.0 hp
    >
    >  Aubrey
    >
    >  Hummm you mean if I apply a torque on a stationary bolt for a
   period of
    > time
    >  that is energy? How did I miss this in 72 years :) I am not saying
    >  you are wrong. Far from it. I totally believe you. I must have
   skipped
    > that
    >  physics/thermo class. Obviously this is a huge gap in my thermo self
    > education.
    >
    >  There is no doubt my body would be burning calories.
    >  If you stood up for a period of time you would be burning calories.
    >
    >  I thought it had to be rotating to get HP.
    >
    >  So a BTU is a torque! Wow.
    >
    >  What is the HP that this oil cooler is dissipating
    >  when it says 400 BTU's/min? We need about 50 HP for a 200 HP
    >  rotary.

    > Paul Lamar
   ------------------------------
   There seems to be some confusion here -- Aubrey is correct but I
   don't think
   of BTU as a torque.

   A BTU is the amount of energy needed to raise 1 pound of water
   1*Fahrenheit.

   If one HP is converted to thermal energy, it will release energy, and to
   keep the coolant at a constant temperature, you would have to
   dissipate 2545
   BTU/hour or 42.4 BTU/min in your heat exchanger. So if your cooler can
   dissipate 400 BTU/min, that is 400/42.4 = 9.4 horsepower.


   Bill Schertz
   KIS Cruiser #4045
   N343BS (reserved)

   Thanks Bill. That cooler is way too small for a rotary because we need
   to dissipate 50 HP in the oil cooler for a two rotor. We would need five
   of those coolers. The coolers are about 7" by 8" by 3.5 inches
   thick. Too thick to be modern. 195 cubic inches core volume.
   If we used four in a rectangular grid it would be about 14 inches
   by about 16 inches by 3.5 inches thick with a core volume
   of 784 cubic inches. REAL BIG!!! Naw! The stock 2nd gen oil cooler
   made by Modine is amazing at only about 250 cubic inches core volume.
   Perhaps this cooler does not have turbulators.

   We would be lucky to force 45 pounds per minute of air through
   it getting it up to only 500 BTU/min.

   As I recall the 13B oil pump is 30 gallons per minute or about
   165 pounds per minute based on oil being 5.5 pounds per gallon.
   I am guessing on the 5.5 pounds per gallon.

   This cooler will only pass 55 pounds of oil per minute so the oil
   circuit
   would have to be in parallel if we used more than one I suspect.

   I sure wish I could get data like this on the stock 2nd gen
   oil cooler or any other brand and size of oil cooler for that matter.
   --
   Paul Lamar ...No rotor no motor.

Oil's heavier than fuel..  Like 7.5lbs/gal.


Matt-

OK Matt. Thanks.