Smash Rocketry New Group Project - The Proton M

This topic has 391 replies, 29 voices, and was last updated 12 years ago by Kevin Osler.

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January 17, 2012 at 4:05 am #55184
BEAR
Steve,
What do you need besides a place to build it and lots of fibreglass cloth and resin? What are you going to need in the way of help? I am sorry if my question seems niave. I have never built a rocket of that size, so I can imagine, fastening, gluing, measuring, fabrication of parts, sanding, glassing, electronics, wiring, switches, cabling, recovery, and on and on. So any teams working any specifics to coordinate all of this so it comes together at the right time? Somebody designing checklists and test lists, etc. I am looking to help, so where do you need me? Any special engineering, fabrication, etc. that can be done before you find the hanger, or vertical assemby building, or barn?
January 17, 2012 at 5:36 am #55185
smashburn
Steve,
What do you need besides a place to build it and lots of fiberglass cloth and resin? What are you going to need in the way of help? I am sorry if my question seems naive. I have never built a rocket of that size, so I can imagine, fastening, gluing, measuring, fabrication of parts, sanding, glassing, electronics, wiring, switches, cabling, recovery, and on and on. So any teams working any specifics to coordinate all of this so it comes together at the right time? Somebody designing checklists and test lists, etc. I am looking to help, so where do you need me? Any special engineering, fabrication, etc. that can be done before you find the hanger, or vertical assembly building, or barn?

Hey Bear! Thanks again for your help .. note I didn’t say ‘offer’ to help .. you’re in it now buddy!! 🙂

I found on the Delta that having a good ‘plan’ in advance was important .. but often once you got parts in hand things changed. I plan to build the motor/fin assembly booster section first as everything else builds on that. I am also -seriously- considering making it a 2-stage project. The hardest engineering task will be the the stage connection and seperation, booster chute chamber and deployment. At 200 lbs, lifting on a “O”, and 12″ diameter .. this will be key to a successful flight.

We will have to consider booster attachment, and deployment if we choose that option, during this initial stage as well.

I do have the centering rings, bulkheads, 12″ tube, boosters, booster motor tubes, rings, etc .. already so we can start laying it out. Initially we need very little room to get started. I’ll go to storage this week/weekend and dig out the rest of the parts I ‘believe’ I have, and see how my epoxy has help up being in storage for years. I also need to find my copy of RockSim to layout and test as we go.

Thanks again!
January 17, 2012 at 5:43 am #55186
edward
Moderator
i’ve got an adept stager that you could use.

Edward
January 17, 2012 at 5:56 am #55187
smashburn
i’ve got an adept stager that you could use.

Edward

Thanks .. those are nice. I would love to chat with someone who’s built/flown a large 2-stage (12″ diameter) and see how there connected the stages. I’ve yet to find any good references/examples on the web. Let me know if you, or anyone, comes across something like that.

Thanks!
January 17, 2012 at 7:05 am #55188
edward
Moderator
This one detects liftoff by using a novel g-switch. Then when that turns off it starts a timer then lights the motor after that. I’d set it for maybe 1-2 seconds after burnout, that way it lights them fast. I’d also mount it the 2nd stage.

Edward
January 17, 2012 at 3:56 pm #55189
Greg Sartz
Here’s a starter ROCSIM file from http://www.rocketryforum.com/showthread.php?t=8606#1….the rocket kept going UP and UP and UP after 12 hours of simulation! (They ejected the the strap on boosters during sim flight).
January 17, 2012 at 4:08 pm #55190
Greg Sartz
January 17, 2012 at 4:42 pm #55191
Greg Sartz
Even includes information from Adrian and his Parrot/Raven systems.

http://www.nar.org/pdf/2011HPRRDreport.pdf
January 17, 2012 at 5:00 pm #55192
Greg Sartz
Device to make sure upper stage is within safe angle from vertical (i.e. no more than 25 degrees), before firing upper stage.

http://www.rocketelectronics.com/rocketiltometer-2-videos
January 17, 2012 at 6:55 pm #55193
BEAR
As I recall from our conversation on Saturday, you spoke of the Delta having an issue becasue you ignited all the motors at the same time. The outboard motors fired and were almost spent before the center engine came up to thrust and the rocket did not really get off the pad until the center one did come up to thrust. That said, will you put a firing delay into the outboard motors so they come up to thrust at the same time as the center motor? Of course if they do that, you will not have the slow lift off, will you? What is the scale of this rocket? 1″: 1 foot gives you a rocket that is about 220″ or 18’8″ tall. Any idea how high it will reach on flight. Are you considering 6 -75mm “M”s and then a 98 or 150mm in the center? Better find some sponsors or volunteers to make a bunch of motors. (How much black powder do you need for an ejection charge, and a separation charge for getting the two stages apart for the air start?)
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