BHP TORQUE CONVERSION

[goflo at pacbell.net]

Martin Hillier wrote:
> 
> Does anyone know the calculation to get torque from horse power and speed?
> 
> Martin H.

Here's a program I wrote for a pocket programmable some years ago.
Think you can extract what you need from it, and it may be useful.
Would'nt be hard to morph it to Qbasic, or whatever.

Jack

100 ! DYNO2.PGM

 The algorithm will calculate horsepower and torque based on the
 the following inputs:

    1) Vehicle weight.
    2) Vehicle speed.
    3) Engine rpm.
    4) Acceleration.

 Calibration for an in-vehicle application would require full throttle
 acceleration to a speed above the threshold of aerodynamic
significance.
 Neutral is then selected and the vehicle allowed to decelerate while
 deceleration and speed are monitored and recorded. This process is
 repeated several times, generating a table correlating speed and
neutral
 deceleration. Instantaneous hp and torque values can now be determined
 inside the observed speed range, and calculated outside it.

 To use this demo version of the program enter the lines below,
 press RUN, and enter parameters as prompted.


280 DISPLAY ERASE ALL,"Vehicle weight (lbs):";MASS;:ACCEPT
AT(23)SIZE(-5),MASS
290 DISPLAY ERASE ALL," Speed (mph):";MPH;:ACCEPT AT(15)SIZE(-4),MPH
300 DISPLAY ERASE ALL," RPM:";RPM;:ACCEPT AT(7)SIZE(-5),RPM
310 DISPLAY ERASE ALL," Acceleration (g):";ACCEL;:ACCEPT
AT(20)SIZE(-4),ACCEL
320 DISPLAY ERASE ALL,"Neutral Deceleration (g):";DECEL;
330 ACCEPT AT(27)SIZE(-4),DECEL
340 !
350 VELOCITY=MPH*5280/3600
360 FORCE=MASS*(ACCEL+DECEL)
370 HP=FORCE*VELOCITY/550
380 TORQUE=5250*HP/RPM
390 !
400 HP=INT(HP*10+.5)/10
410 TORQUE=INT(TORQUE*10+.5)/10
420 !
430 IMAGE ###.# hp ###.# lbs.ft #### rpm
440 DISPLAY ERASE ALL,USING 430,HP,TORQUE,RPM:PAUSE:GOTO 280

 Note that HP and torque for a constant speed implies that ACCEL and
 DECEL are equal AND non-zero.