RMR motor stats 1996-2002

Kenneth C. McGoffin · 2004-01-12T02:38:33+00:00

It took a little work but I finally figured out Bob's clever formatfor the summary information. Guess I passed the IQ test...(wink).Anyway, using the motor totals for all seven years from his web siteand running them through my curve fit analysis to get a broad view ofRMR's 'style' of rocketry I get the following. What I call a "group"can be viewed as a group of flyers but is more likely a "style" or"attitude" of rocketry. I excluded Micro-Maxx because it's really itsown thing, and besides, including it would have screwed up the math. The curve fit does in fact reveal that it would show up as a separategroup anyway.The way I do the math, 1/4A is size class zero, 1/2A is class 1, M+ issize class 14.The low power group is characterized by a mean motor class size of3.54 (halfway between B and C) and a standard deviation of 1.76classes. The high power group is characterized by a mean of 8.21 (abit over G) and a standard deviation of 1.37.Running a trimodal analysis refines these numbers only slightly. Thethird group shows up as a small excess of 'C' motors(1 percent oflaunches) forming a group with mean of 3.97 and a std. dev. of 0.12size classes(effectively a small spike at C). The low power groupchanges slightly to a mean of 3.43 and a std. dev. of 1.81 (75% oflaunches)while the high power group becomes a mean of 8.11 and a std.dev. of 1.55 (24% of launches). Overall this is a slightly betterfit, but both solutions are only an "ok" fit by comparison to what Iusually get. (On data from some local launches I've obtained trimodalfits that were SCARY good!) In either solution the low power group isobviously truncated at 1/4A indicating that it's not surprising thatthey would fly 1/16A Micro-Maxx motors, although not in the numbersreported. Like I said, Micro-Maxx is its own thing.For comparison, data from OregonRocketry launches at our easternOregon site breaks down into the following three modes:Low power, mean 4.08 std. dev. 1.22, 43% of launchesmid-power,...

Jan 12, 2004 21 Replies

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Jackbearjr 22 years ago

I personally fly everything from 1/4A thru K, and did, last year. (Plus an M on a cert attempt a couple years ago.) Jack W. Kale, Jr. NAR #70384 Insured, Tripoli #5798 Level 2

Triple the shock cord! Use more epoxy! Always fly straight up- you need the exercise anyway.

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Ted Cochran 22 years ago

[yadda yadda yadda]

devices

Will somebody bang the record player again? The needle is stuck....

--tc [I'm dating myself, aren't I?]

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