Quote:
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Originally Posted by CenturiGuy
Here's an idea: ...Classic model rocket designs updated for the 21st Century
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From
http://www.ninfinger.org/~sven/rock...a/72est022.html (right-hand page, rocket on left):
Semroc "Saros" semi-scale clone
BC-734 Nose cone
ST-760 Body tube
BR-79 Balsa Reducer (Transition)
SE-10 Screw Eye
ST-990 Body tube
CP-12 Parachute
LL-122 Launch lug
3/32" Fin set
EM-79 Engine mount**
* ST-730 Body tube
* TR-7 Thrust ring (Engine block)
* 2 - CR-79 centering rings**
* EH-28 Engine hook
1/16" CR-79 "Nozzle" Centering ring**
PR-79 Paper Reducer "Nozzle" (Transition) -- 3/4" long**
Kevlar thread
Elastic shock cord
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**Not all parts may be available from Semroc yet.
This version = 21" long, 1.2 oz empty
(Original = 22.5" long, 1.5 oz empty)
Motor / Altitude / Deployment Velocity
A8-3 -- 242 ft. -- 10 fps
B4-4 -- 581 ft. -- 28 fps <- 'Chute shred!
B6-4 -- 589 ft. -- 33 fps <- 'Chute shred!
B6-6 -- 610 ft. -- 31 fps <- 'Chute shred!
C6-7 -- 1298 ft. -- 22 fps (Near shred?)
FYI: 1972 Estes catalog (see above) recommends A8-3, A8-5, B4-4, B6-4, C6-5 motors
Motor protrudes 1/4" from nozzle in "aft" (2nd) image below.
Special thanks to Mike "Moldin' Oldies" Schmidt (for fin measurements) and Mark Thell at NARCON 2006 (for selling me an original [RED!] Estes Saros).
Cheers,
--Jay