Brian Ditmer
Well-Known Member
- Joined
- Nov 20, 2019
- Messages
- 105
- Reaction score
- 109
build instruction for Ebay kits (looking at you SMT)
A JLCR (or some future, smaller cousin) obviously has an altimeter inside. All that's needed is an external interface. I second the motion.Already mentioned separately, but I'm going to link them: a small-form-factor Chute release with integrated altimeter. In smaller rockets it can be some combination of difficult, inconvenient, or undesirable to try to squeeze in on-board electronics. A small form factor JLCR (fits BT55) would be great, but if I'm going to take advantage of the JLCR to fly higher, I'm also going to want an altimeter.
A flatscreen tv could be modified to launch like a rocket powered monocopterWould a flatscreen be launched like a spool rocket? or would the motor be mounted / inserted in the base / stand?
Does it need to be turned on to launch successfully?
A flatscreen tv could be modified to launch like a rocket powered monocopter
Two things:
- Already mentioned separately, but I'm going to link them: a small-form-factor Chute release with integrated altimeter. In smaller rockets it can be some combination of difficult, inconvenient, or undesirable to try to squeeze in on-board electronics. A small form factor JLCR (fits BT55) would be great, but if I'm going to take advantage of the JLCR to fly higher, I'm also going to want an altimeter.
One can look for videos from Apogee, John Coker, and others. But nothing beats sitting in a room with someone who's good at it and is there to teach.
A JLCR (or some future, smaller cousin) obviously has an altimeter inside. All that's needed is an external interface. I second the motion.
No, no, silly. Three or four flat screen TVs are employed as fins.A flatscreen tv could be modified to launch like a rocket powered monocopter
Rumor? You set the thing to release at a particular altitude; how else could it possibly work?rumour has it
Rumor? You set the thing to release at a particular altitude; how else could it possibly work?
The camera I use has a tiny built in LCD, does that count?Do you often launch microwaves & flat-screen TVs?
Ah, well, that would be cool!Sorry rumour has it that a JLCR & ALT II (or III) will be in a combined package soon.. JLCR-ALT-IV
Seems like I touched a nerve there. Sorry. The notion of a screw-on retainer for 6 mm would be a joke, but I don't disagree about a wire retainer or some other solution. There should be a standard the moment another manufacturer expresses interest making in such engines, and I'd like to think there will be. As long as it's a one player market there's no reason for a standard.
There's a motor retention technique for minimum diameter rockets shown in Tim van Milligan's book that uses a piece of piano wire bent into three sides of a rectangle, two long sides and one short, where the short side goes over part of the bottom of the engine, staying clear of the nozzle of course, and the long sides are buried in fin fillets. I've started using that method on larger than minimum diameter rockets, with the ling sides going through pinholes in the aft centering ring. It seems like that should work nicely for MicroMax.
Ditto on a Chute Release for smaller tube sizes.Chute release that comfortably fits BT55.
All the time!Do you often launch microwaves & flat-screen TVs?
I hadn't seen this one before. Very nice idea from Tim at apogee.
Can you throw a flat-screen TV like a discus? Could be an Olympic event.
2) More pyro-less deployment options
I work with college teams and having BP on campus can be an issue. More pyro-less deployment options (inexpensive and reliable) would be welcome.
John Beans of Jolly Logic talked to the Rocketry Show guys when they did an interview show with him a couple years ago about a servo/solenoid pop open “fairing” for recovery as a natural progression from the Chute Release but I’ve not read or heard anything about it since then.Now you've got me internally brainstorming other ways to do that. Spring loaded separation/ejection with solenoid release? Or springs with hot wire to melt through plastic retaining pins or screws? Non-pyro forms of chemical gas generation (e.g. rapid combustion that is not considered pyrotechnic for regulatory purposes, or other types of chemistry entirely)?
Now you've got me internally brainstorming other ways to do that. Spring loaded separation/ejection with solenoid release? Or springs with hot wire to melt through plastic retaining pins or screws? Non-pyro forms of chemical gas generation (e.g. rapid combustion that is not considered pyrotechnic for regulatory purposes, or other types of chemistry entirely)?
The TARC team I mentor experimented with spring ejection for altitude control. It was pretty difficult for them to make it reliable. It would probably be easier with a commercial altimeter, but they were also rolling their own there.John Beans of Jolly Logic talked to the Rocketry Show guys when they did an interview show with him a couple years ago about a servo/solenoid pop open “fairing” for recovery as a natural progression from the Chute Release but I’ve not read or heard anything about it since then.
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