If you're referring to the circles, they are "mass objects." They represent things like the harnesses, recovery attachment hardware, and electronics bay contents.
Ok, I have never used rocksim so that's why I am asking such obvious questions.If you're referring to the circles, they are "mass objects." They represent things like the harnesses, recovery attachment hardware, and electronics bay contents.
I figured it was something like that. I've been using RockSim since 2007, before OpenRocket existed, so I've stuck with it.Ok, I have never used rocksim so that's why I am asking such obvious questions.
The stock method of building the interstage coupler has you epoxy a 38mm electronics bay centered inside and sticking out the back of the interstage coupler, and it only opens in the back and there is no access to the front end. This would prevent me from being able to wire a stage separation charge in the front of the interstage electronics bay. I might have been able to work with just reaching my hand inside if it was a bigger rocket, but it's a 2" rocket so no way to get my hand in there to wire a charge.why are you adding extra tube? Why can you not access the interstage coupler?
That also explains spending 120$ on something that you can get for free.I figured it was something like that. I've been using RockSim since 2007, before OpenRocket existed, so I've stuck with it.
Nice to know I'm not the only one who decided the stock interstage wasn't going to work for them.I'm on the same build and am currently working on the ISC. I too will be scratch building that section to allow for better electronics support. The sustainer is ready for a test flight in 2 weeks.
The stock method of building the interstage coupler has you epoxy a 38mm electronics bay centered inside and sticking out the back of the interstage coupler, and it only opens in the back and there is no access to the front end. This would prevent me from being able to wire a stage separation charge in the front of the interstage electronics bay. I might have been able to work with just reaching my hand inside if it was a bigger rocket, but it's a 2" rocket so no way to get my hand in there to wire a charge.
I use brake line as the conduit for the lighter to light the sustainer. Make sure you put it on the inside of the centering rings so that you have adequate clearance for the interstage coupler. The centering rings are not large, so if you put the conduit in the middle of them, the interstage coupler won’t fit. It’s not a bad idea to put the conduit right up against the centering rings. And there is no reason to extend the conduit any further than the forward-most centering ring. The conduit is tight to begin with, so pushing the wire through the conduit can be challenging. So don’t make it any longer than necessary. Once you get the wire though the forward end of the conduit, you can fish it out with some long forceps.https://www.rocketryforum.com/threa...r-kit-to-a-2-stage-build-vindicator-jr.55463/
I am placing this old build thread here for myself as a reference. I especially liked the idea of using a little metal tube as a conduit to wire the upper stage igniter.
Oooooooooo........trade secrets! That calls for a hobby shop trip!I frequently use K&S aluminum tubing for the wire channel. It is lighter, and has a larger ID than brake line with the same OD. I use the tubing with .014 wall thickness.
It really doesn’t matter much which side you fire the separation charge. Whether you do it from below or above, you typically want to dump the booster soon after motor cutoff. Lighting the sustainer motor is a fun art. When I did my first one, I wanted it to light right after separation so it was close enough to the ground so I could see it. So with a Wildman Junior, I used an I to an H, separating about a half second after motor cutoff and lighting the sustainer a second later.I am also building my first two stage, although it's a 65mm airframe and scratch built.
https://www.rocketryforum.com/threads/design-and-build-thread-aro-b-two-stage.182419/
I am routing both sustainer air-start and sep charge from the sustainer avionics bay. I am curious how one times these two events when they are controlled by separate altimeters as you are proposing.
That's exactly what I am doing. I'm using a Proton to initiate all events from the sustainer.It really doesn’t matter much which side you fire the separation charge. Whether you do it from below or above, you typically want to dump the booster soon after motor cutoff. Lighting the sustainer motor is a fun art. When I did my first one, I wanted it to light right after separation so it was close enough to the ground so I could see it. So with a Wildman Junior, I used an I to an H, separating about a half second after motor cutoff and lighting the sustainer a second later.
I have never fired the separation charge from the sustainer, but if I did, I would use an altimeter with four channels, like the Raven or the Proton, to fire separation, light the sustainer, deploy the drogue, and deploy the main. And then use a simple altimeter like the Quantum or RRC2+ as backup on the chutes.
I’m not sure I understand. If you use the Proton for all four events, how is that two separate devices?That's exactly what I am doing. I'm using a Proton to initiate all events from the sustainer.
I guess my question was directed at timing between two devices that may be measuring slightly differently. If the separation and air start are purely timer initiated and start their respective clocks at some established event (such as some pre-established safe altitude), different calibrations of the devices would result in the two timers not being in sync.
Granted this is probably negligible in most cases.
Until it's not and a separation charge fires way too early leaving a coasting sustainer.
I guess that's where altitude/accel lockout comes in handy to prevent an off-nominal air start.
Regardless, two separate devices controlling two events that are so sensitive to timing just seems like an error-prone strategy to me.
It's not. I was referring to the OP's setup and that type of two-device setup in general.I’m not sure I understand. If you use the Proton for all four events, how is that two separate devices?
Second one for recovery redundancy I hope...I’m not sure I understand. If you use the Proton for all four events, how is that two separate devices?
I have always used two separate devices to manage separation and sustainer ignition. Not a problem.It's not. I was referring to the OP's setup and that type of two-device setup in general.
You don’t need to put the ematch head through the conduit. You push the wire through from the aft end.My plan is to use these for the upper stage igniter conduit after finding out the width of the ematches is 2.5 mm
Yes, that's what I was planning to do. The wire is 2.5mm across, not the head.You don’t need to put the ematch head through the conduit. You push the wire through from the aft end.
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