the thrust profile
as a set of time (in seconds) and thrust (in Newtons) data points in the
same format as mine or try the
user-entered thrust profile version of this
program.
This simulation uses a number of approximations to simplify the amount of data you have to input. For instance, there is no attempt to simulate the effects of winds and the drag of your rocket is calculated with a simplified transonic drag model.
The default Cd of .75 should be pretty close for a typical, rocket-shaped, model vehicle with three or four average sized fins. For other vehicle geometries, you may need to supply a different Cd.
I originally obtained the motor thrust profiles
by measuring the curves printed on
the manufacturer-supplied data sheets for several Estes and Aerotech motors.
Then I found out that someone had already done this for a couple of hundred
motors. You can find the motor database
HERE.
The program interpolates (linearly)
between time/thrust data points. If you would like to see a motor added,
Email the thrust profile
as a set of time (in seconds) and thrust (in Newtons) data points in the
same format as mine or try the
user-entered thrust profile version of this
program.
Claimer:
Because of the approximations used, the large number of uncontrolled
real-world variables influencing rocket trajectory, and the very high
probability
that there are bugs in this experimental program, I cannot accept any
liability for the
failure of your actual rocket flight to conform to this projection.
I hope you enjoy the program and let me know how its projections
match any actual flight measurements you may make.
with
comments, corrections, and bug reports.
Visit the Mark Sullivan
home page for more technical hobby resources
or the Teeniemünde Rocketry Club