True, but the
rated delay is relative to the burnout time of the motor, is it not? An E15-4 should eject 4 seconds after burnout (approximately
), not after ignition, otherwise it'd be useless. So the existing reported timing should be essentially correct as currently implemented.
Unless I'm missing something.
Neil --
First, thanks to you and your team for OpenRocket !
It is an amazing piece of work
As for delays ...
The Estes E16 is a Black Powder End-Burner so yes, the delay is ignited after the propellant burns-through.
It should be right-on.
OTOH, most AP Motors are Core-Burners and the delay is ignited right along with the Propellant.
The Aerotech Delays that I am familiar with come in Standard Lengths and the burn rate is predictable which is why one can adjust the Delay Time by drilling the Delay.
But in practice, it 's complicated because AP burn rates depend on the pressure in the motor casing.
I fly with electronics and without motor ejection and I always fly the longest Delay available for the Motor.
This way I've got a smoke trail for as long as possible.
It matters when I fly small rockets very high -- too high to see at apogee
I also pack as much chalk as my drogue tube will hold when apogee is very high and it is expected much after the end of the delay smoke.
And when apogee is later than the delay, at least I know how long to watch the 'empty sky' for the cloud of chalk.
Or not ... oh no ... incoming !
And that's why I even noticed the Ejection Markers in OR -- it is nice to know when I will lose my smoke trail.
Anyhow, no big deal, I am sure there are other things to work on
Like I mentioned in my 'Time to Open the Chute' Thread, I am still learning OpenRocket and wondered if I missed a setting somewhere.
Thanks again !
You and the OR Dev Team are awesome !
-- kjh
p.s. speaking of time ...
One other thing I would find useful on the Rocket Design View is to show the time to Apogee along with the distance:
Example
Code:
Apogee: 14596 ft (at 25.1 sec) // add time to Apogee here
Max velocity: 1984 ft/sec (mach 1.79)
Max acceleration: 2294 ft/sec^2