Flynfrog, we might have to take you up on that offer to cast at your place pretty soon. :grin:
just let me know
Jim would also be a good one to ask.
On a side note any idea when the uroc launches are the website has been down forever.
Flynfrog, we might have to take you up on that offer to cast at your place pretty soon. :grin:
Wow, we really need to get working on this.
We're currently at the motor design phase, so the stuff I can talk about on here is pretty limited. I would post about it on the Research section, but I'm not a member of it. Long story.
The propellant is still up in the air but we're narrowing down our options. On the table is David R's Turbo White, Tiger Tail, and 72/10. Each have their pros and cons. If you have a formula you think would be good for this application, PM me. I'd love to talk.
A few weeks ago, Clay and I made a trip down to RCS/Aerotech to pick up some chems. We got enough to make about 30lbs each. That should be enough. :wink:
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Flynfrog, we might have to take you up on that offer to cast at your place pretty soon. :grin:
If we're feeling confident, we might be able to static test at springfest.
Alex
It was tons cheaper then having it shipped. Plus I got a tour of AeroTech!What did it cost to drive down there and back. I guess it beat the the shipping or you wouldn't have done it?
TA
just let me know
Jim would also be a good one to ask.
On a side note any idea when the uroc launches are the website has been down forever.
It was an issue with my certs. My TRA prefect sent them in but TRA has no record of receiving them. I'll get this cleared up soon.Ahem........ with 3k+ posts on the board here, I would suspect a request to post on the research thread would get positive attention. Tiger tail is a nice mix to work with. Carbon black is "always" fun to work with.:wink: Kurt
Quick little update:
Almost ready to start casting. It's been a NIGHTMARE to work out grain geometry with this thing. Clay and I spent a few hours on the phone just talking about our options. I'm really not sure how much I can post about grain geometry here without interfering with the EX rules, but I can say its monolithic with parts of the core finocyl and parts of it being cylindrical. It took forever to find a happy medium between ease of casting and efficiency. Long story short, the motor works out to be about a 3700ns L1800 with a 2 second burn time. Crazy looking thrust curve too, but it generally doesn't deviate too far from the KN range we're comfortable with.
I through together a quick sim, using the burnsim estimates and using actual weights from my 54mm components. This is were things get interesting. Openrocket is giving me insanely high numbers as far as velocity goes. Mach 3.8-Mach 4. I double checked all my weights and even overestimated some of them (like my AV bay weight). I double checked the motor, but everything seems pretty realistic. Openrocket might be really overestimating or I was just vastly underestimating when I did initial calculations. Although it's likely it's that first one, I just got a huge boost of motivation toward this project.
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More soon!
Alex
At those speeds, forget about paint on the fins. They'll be toasted anyways. Keeping them on will be a challenge. You'll have heating on the outside and at the end of the burn, heat coming out from the case. You welding the things on?:shock: Kurt
I did, but I'm not sure I can post them. I never asked to take pictures and he never saw us take pics, so I dont know the policy. However, here's 1000 words about it to make up for the lack of pics. That equals one picture, right?: Imagine a room, about the side of your average living room - maybe 20 x 30 feet, with boxes everywhere, filled to the top with rocket motors, sealed and packaged. Stacks of M and N motors. There was some serious potential energy in that room. I walked through the rest of the factory and saw the propellant processing room and the place where they make kits, the machine that does mass tube slotting, the place where they cut shock cord, etc. Wasn't allowed in the mixing room. I probably couldn't handle it anyway. There were also shelves stacked high with motor components. Cases, closures, you name it. Upstairs was the R&D. There were experimental motor components and stuff that wont be released for a while. Out back was the motor testing stand, right out in the back next to a public road! They'd tested N motors in that little bunker, right next to buildings. Anyway, thats not quite 1000, but its about all I remember. I'll definately go back sometime. The guy who showed us around was super nice and generally really interested in what AT was doing. Maybe I'll ask to take some pics when I got back.Grouch said:Alex, did you take any pics during you tour you can share?
Make sure you go on a day when they aren't busy! We were just barely able to get a tour. They were shipping out the last of the Wildman order that day.kenstarr said:Oh Alex! So jealous of the Aerotech tour! I've considered driving down there for a will call but I'm a couple hours north of you. Still, a tour! Someday I'm going to have to head down regardless of any savings or not just for that reason alone! Good work.
-Ken
If the case is meant to be single use, why not bond a coupler piece on the inside to hold closure in and a similar one to hold the nozzle in. After you fire, cut the case open and retrieve those components.
That's a fantastic idea. I'll look into that, maybe do a few tests.If the case is meant to be single use, why not bond a coupler piece on the inside to hold closure in and a similar one to hold the nozzle in. After you fire, cut the case open and retrieve those components.
I realize this is a little off topic, but what camera did you use to film that and what frame rate/resolution did you get?
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