So what do ya have Cooking? - Northern Colorado Rocketry

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

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November 11, 2006 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
November 12, 2006 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
November 12, 2006 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 🙂
November 12, 2006 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
November 13, 2006 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
November 13, 2006 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
November 13, 2006 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.
November 13, 2006 at 1:56 am #43516
edward
Moderator
Ah, so that’s a better difference. Though for the cost probably not worth it.

Edward
January 15, 2007 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
January 15, 2007 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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