Randall Clague wrote: > > On Fri, 03 Oct 2003 23:20:02 -0700, David Weinshenker > <[EMAIL PROTECTED]> wrote: > > >From this, we can deduce that the trajectory will depend on > >the thrust-time history as well as the initial launch angle - > >and (other factors being equal) the path of a long-burning > >rocket will be more influenced by differences in the initial > >launch angle (or by other perturbations, such as wind-deflection) > >than will that of a short-burning one. > > Hm. I believe you, but I'm going to have to play with Dave Hall's > program some before I really see it. Considering I haven't bought it > yet and can't afford it, I'll have to take your word for it for some > good while.
You don't need a computer. You fired mortars in the Marines (or saw them fired), didn't you? That's equivalent to an extremely short burn rocket - the flight is almost all "coast". All of the "total impulse" of the launching charge was applied in the direction that the tube was initially aimed. Now watch sport rockets being flown on a windy day. (You've seen Livermore launches, right?) The longer the burn time, the more likely they are to end up pointed toward the horizon with the motor still going. (Why do you think I prefer to use extremely short-burning motors under such conditions? And on a more general note, why do you think I was trying to encourage more ERPS folks to get some sport rocket experience?) -dave w _______________________________________________ ERPS-list mailing list [EMAIL PROTECTED] http://lists.erps.org/mailman/listinfo/erps-list
