Rotary Group,
Having a friend run some prop sheets for us and there is the need to

enter

HP/RPM values.
One instance I have is for an O-360 Cozy:
RPM: 1200  1800  2250  2700
   HP:    90    132    164    180
What would be representative values at meaningful datapoints for the

TO4-E

turbo'd gen 3 with mild street porting if we choose to use 7200 RPM as

our

redline?
Also needed to know the altitude at which the power data is no longer
constant and begins to vary with altitude.
...Chrissi

Cozy Mk-IV 13B-turbo
 www.CozyGirrrl.com
Chrissi@BlueMountainAvionics.com

Chrissi -I do not know what flight points the supplied data is for, but it
looks rather erroneous.
At a given speed and altitude increasing rpm requires increasing HP cubed ie
doubling rpm
requires 8 times as much power.
Power output at altitude is almost a direct function of absolute manifold
pressure that
you can obtain - "flat rating" is accomplished by making up the entry
pressure by
varying pumping of the supercharger or turbo charger - a normally aspirated
engine
starts losing power the instant you have started to gain altitude.
Hope this helps, instead of adding confusion - Vance J

 
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