> >>>I noticed a funny problem ? (or feautre I don't understand)
> >>>I will fly a loc-iv on a g40-4. it will say optimum delay is 4.65
> >>>I will then fly it on a g-40-10. it will say optimum delay is 7.65
> >>>this anomily is the same for jsut about everthing I fly, a short
> >>>delay, a short optimum time. A long delay , a longer optimum time.
> >>>Anyone know what I'm doing wrong ?
> >>I think that, if you select a specific delay, it *stops* simulating
> >>when the delay finishes. So, if you select a delay that is shorter
> >>than the coast-time-to-apogee, the rocket is still moving fast, but
> >>slowing down, at the end of the simulation.
> >>"Best" delay time seems to be picked by looking for the time when the
> >>rocket is moving the slowest. For a sim that stops before apogee,
> >>this will always be right at the end of the delay.
> >>I haven't looked, but I'll bet you find that the G40-4 has a delay
> >>time of 4.65 seconds in the .eng file you are using.
> >>It's simply picking the "best" delay time *out of the values it
> >> - Rick "But, yes, I'd still consider it a bug"***inson
> > Again, I don't know nuttin 'bout RockSim, but a LOC-IV will reach apogee
> > LONG before 7.65 seconds. The 4.65 number sounds close: I calculated about
> > 4.4, but it depends on what you pick for the mass and CD which the original
> > poster didn't specify.
> RockSim calculates a pretty low Cd for a LOC-IV, around 0.29. wRASP uses
> 0.60 by default. The real Cd is probably somewhere in the middle,
> depending upon building techniques, finish, etc.
GHS suggested 0.85 and he would be right more of the time if the
alphabet still stopped at F.
Jerry Irvine, Box 1242, Claremont, California 91711 USA
Please bring common sense back to rocketry administration.
Produce then publish. http://www.FoundCollection.com/