lcorinth
Well-Known Member
- Joined
- Aug 5, 2014
- Messages
- 1,022
- Reaction score
- 46
I've got a two-stage BP model in mind with kind of a longish booster. I'm a little worried that, rather than tumble, the booster might just fall straight down, and I'd like to have a parachute in there.
I did see this thread, which looks like a pretty ingenious system, but I'm actually going to see about converting a single-stage kit into a two stager, and don't want to put on any external pods if I can help it.
I plan on using a long motor tube to funnel the gasses toward the sustainer motor. What I'm unsure of is where to pack the chute so it doesn't get charred (maybe next to the motor tube, just above a centering ring), and also how to ensure the chute actually comes out.
One idea I had was simply to put a bunch of holes in both booster centering rings, so that, as the booster falls away, the air passing through the rings would push the chute out. But I'm not sure how reliable that would be.
Another idea I had would be to loosely tape or attach the chute via a string or something to the sustainer, so that it would pull the chute out as it pulls away from the booster. But that seems as if it could make the sustainer veer off course. Perhaps an attachment where the motor would actually burn through the string, or something. Also, seems like maybe a bad idea, or at least something that could fail as often as it works.
[Edit] I should clarify this part. What I mean is a small bit of tape which would be meant to pull away from the booster. Not just a string permanently attached to the sustainer - obviously, that would be a bad idea, as it would drag the booster along with it.
Or rear ejection maybe? I've never built one of those, so I'm not entirely sure how they work. I'm not sure if the motor ejecting would also be there long enough to light the upper stage motor.
Anybody ever try this before? What system did you come up with? I'm not really set up to mess with any kind of loose BP pyro ejection charges (I live in an apartment), so I'm not sure how practical my idea is. Seems like there should be a workable solution, but I'm not sure what it is.
Thanks!
I did see this thread, which looks like a pretty ingenious system, but I'm actually going to see about converting a single-stage kit into a two stager, and don't want to put on any external pods if I can help it.
I plan on using a long motor tube to funnel the gasses toward the sustainer motor. What I'm unsure of is where to pack the chute so it doesn't get charred (maybe next to the motor tube, just above a centering ring), and also how to ensure the chute actually comes out.
One idea I had was simply to put a bunch of holes in both booster centering rings, so that, as the booster falls away, the air passing through the rings would push the chute out. But I'm not sure how reliable that would be.
Another idea I had would be to loosely tape or attach the chute via a string or something to the sustainer, so that it would pull the chute out as it pulls away from the booster. But that seems as if it could make the sustainer veer off course. Perhaps an attachment where the motor would actually burn through the string, or something. Also, seems like maybe a bad idea, or at least something that could fail as often as it works.
[Edit] I should clarify this part. What I mean is a small bit of tape which would be meant to pull away from the booster. Not just a string permanently attached to the sustainer - obviously, that would be a bad idea, as it would drag the booster along with it.
Or rear ejection maybe? I've never built one of those, so I'm not entirely sure how they work. I'm not sure if the motor ejecting would also be there long enough to light the upper stage motor.
Anybody ever try this before? What system did you come up with? I'm not really set up to mess with any kind of loose BP pyro ejection charges (I live in an apartment), so I'm not sure how practical my idea is. Seems like there should be a workable solution, but I'm not sure what it is.
Thanks!
Last edited: