PLEASE somebody look at these equations
and tell me where I am going wrong. There must be a mistake in here
somewhere.


*********************************************************************


  CLS
  Weight = 1900       'pounds
  statthrust = 2000   'pounds
  distance = 0        'feet
  FlatPlate = 4       'square feet
  PropEff = .8
  HP = 300         '1 HP = 550 pound foot per second
  FPS = .001
  distance = .001

PRINT "Time     Drag      HP     NetThrust     G's    FPS    MPH   Feet"
PRINT

FOR time = .1 TO 4.6 STEP .1

PRINT USING "###.#"; time;

Drag = FlatPlate * MPH ^ 2 * .0026

PRINT USING "#######.##"; Drag;

HP = HP * (1 - .000003 * distance) 'adjust HP for altitude.

PRINT USING "   #####"; HP;

Thrust = (HP * 550 * PropEff) / FPS

IF Thrust > 2000 THEN Thrust = 2000 'lower limit for  thrust

NetThrust = Thrust - Drag

PRINT USING "#########"; NetThrust;

Gs = NetThrust / Weight
PRINT USING "     ##.##"; Gs;
velincFPS = Gs * 32 * .1

VEL = VEL + velincFPS
PRINT USING "#########"; VEL;
MPH = 60 / 88 * VEL
PRINT USING "######"; MPH;
distance = (VEL * time) + distance
PRINT USING "########"; distance
NEXT

You can only climb straight up for a few seconds so you better
start pitching over right away or its going to hang on the
prop. This program assumes you are going to pitch over right
away. If you don't the velocity will drop to near zero and the
the airplane will stop climbing vertically. It also assumes the prop
pitch is adjusted for maximum thrust at all times.

Top speed will be limited by the rotor tips going supersonic.

Paul Lamar ...No rotor no motor.


Paul,
The way I read your data, at takeoff, your are making 6.66 lbs of thrust per
hp. At 11,000 ft you are making 9.18 lbs of thrust per hp. I think that
portion of your formula is inverted, as the other attached chart shows the
prop loosing thrust with airspeed (and air density), not gaining.
The other thing is the velocity appears to be gaining at a steady rate and
it should be decaying in proportion to the vertical g force.
As a reality check, look up the gross weight of a 300 hp helicopter and what
it's vertical performance is.
Larry

Thanks Larry. I'll check it over.