So what do ya have Cooking? - Northern Colorado Rocketry

This topic has 35 replies, 6 voices, and was last updated 18 years, 11 months ago by edward.

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2006-11-11 at 9:51 pm #43509
edward
Moderator
I’ll have to get all the final numbers done for the M. It’s kinda heavy and odd diameter 4.5″ OD. The first priority of the M motor is a flight in HS-2 – a rocket built by John Bixler. To call it a rocket is a little silly. It’s more like motor with fins and something called a parachute (someone said it needed one). Should be a great MHM flight. After that we’ll see how it goes.

Edward
2006-11-12 at 8:05 am #43510
denverdoc
Ed,

No sweat. I know John B had plans for that flight for last year. The weight is not an issue–the way I’d like to configure the flight is close to a ton of thrust for 1.5 seconds–should be about 10 gees, then kick the booster, and slow burn–of maybe 2-3 gees for 10 seconds+. Gravity turn might be an issue so be good to have an R/C shut down. Think it could be a very cool flight Ed, and the diameter is not an issue as its an 8 inch diam rocket.
John S
2006-11-12 at 9:25 am #43511
Anonymous
Edward, what is the total impulse of your M500? Are you going to certify it? Sounds intriguing… I do wish it was 4 inch, though. Can’t have everything 🙂
2006-11-12 at 3:35 pm #43512
edward
Moderator
The M500 has a total impulse of 9000 N. I’m hoping to up that to around 10,000 N. I don’t know about certifying it right now. I’ve been on/off about doing it. I don’t think most people could build light enough in that size to really make use of the long burn. I’ve seen 4″ diameter tanks that I could use, though they cost an arm, leg and kidney. Right now the tank is only about $50 and the true 98mm tanks are well into the $400 range and are much heavier.

Edward
2006-11-13 at 1:06 am #43513
denverdoc
Ed,

Have you priced the composites from Luxfer–likely cost an arm, leg and both kidneys but they are light and 100mm Diam.

http://www.luxfercylinders.com/products/medical/productrange/specifications/us_metric.shtml
2006-11-13 at 1:09 am #43514
edward
Moderator
No, I haven’t. The cylinder that I have right now weighs 3.4 kgs and is aluminum. The equivalent from Luxfer on that page weighs 3.3 kgs empty. Not worth it for 100 grams.

Edward
2006-11-13 at 1:24 am #43515
denverdoc
Gotta scroll down–either the CF or FG that are near E tank volumes are 1.7 and 1.9 Kg dry respectively.
2006-11-13 at 1:56 am #43516
edward
Moderator
Ah, so that’s a better difference. Though for the cost probably not worth it.

Edward
2007-01-15 at 6:43 am #43517
denverdoc
Maybe time to revive this thread, word on the street says we have some awesome Research rockets for MHM now that we have a green light on sunday. Mike B mentioned IIRC a three stage rocket involving many big motors M-K-K?, James R said something about a 6 inch motor, I know Con is up to something….
JS
2007-01-15 at 6:51 am #43518
Conway Stevens
Participant
Well………… James and i Bought the 6 inch motor and im working my way to a project for that of course.. im sure James will use it before I. But I should have a FULL N on MHM in a 98mm 17,500ns case to fly. Research load of course. Should be right at the 20K area for Full Throttle and a great flight. So I guess you could say I am up to something.
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