ActingLikeAKid
Well-Known Member
- Joined
- Nov 16, 2015
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Has anyone figured out a good way to simulate the Jolly Logic Chute Release in OpenRocket? It looks like there's nothing in OR to simulate "the chute came out so the rocket is now tumbling, but not under chute". With a little experimentation on a simple rocket design, I found this:
No chute, no ejection charge, ground hit at 165 mph.
No chute, ejection charge, ground hit at 165 mph.
30cm chute, ground hit at 22 mph.
1cm chute (I was trying for "there's theoretically a chute out, but it's not really doing anything"), ground hit at 197 mph. So it looks like this is one of those "near the end of the curve, things get weird" things, fair enough.
7cm chute, ground hit at 97 mph.
I don't have a ton of data on "rockets falling separated but without a functioning chute", but I would guess that ~100mph is a maximum, maybe less? Of course, it depends on body tube width and rocket weight.... So I think my strategy will be to create a pseudo-drogue parachute, enough to slow the rocket to about 80 - 100 mph, with an overridden mass of zero, that comes out at apogee, then have the real chute open at whatever the JLCR would be set to.
Open to input on this, and particularly interested if anyone has data on how fast a rocket falls under JLCR (i.e. nose or upper body separated, parachute "bundle" out)
No chute, no ejection charge, ground hit at 165 mph.
No chute, ejection charge, ground hit at 165 mph.
30cm chute, ground hit at 22 mph.
1cm chute (I was trying for "there's theoretically a chute out, but it's not really doing anything"), ground hit at 197 mph. So it looks like this is one of those "near the end of the curve, things get weird" things, fair enough.
7cm chute, ground hit at 97 mph.
I don't have a ton of data on "rockets falling separated but without a functioning chute", but I would guess that ~100mph is a maximum, maybe less? Of course, it depends on body tube width and rocket weight.... So I think my strategy will be to create a pseudo-drogue parachute, enough to slow the rocket to about 80 - 100 mph, with an overridden mass of zero, that comes out at apogee, then have the real chute open at whatever the JLCR would be set to.
Open to input on this, and particularly interested if anyone has data on how fast a rocket falls under JLCR (i.e. nose or upper body separated, parachute "bundle" out)