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Originally Posted by CenturiGuy
Classic model rocket designs updated for the 21st Century.
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The recent "Vulcan?" thread inspired me to track down this non-kitted Centuri design at JimZ:
http://www.dars.org/jimz/finless.htm
Version 01 has 0.4 oz. clay nose weight, per the original plans at JimZ.
Centuri Finless (using corresponding Semroc parts)
BC-736 Nose cone
ST-7180 Body tube (cut to 4.5" L)
Clay Nose Weight -- 0.4 oz.
BTC-7 Tube coupler (Bulkhead)
SE-12 Screw Eye-Large
CP-12 Parachute
ST-7180 Body tube (cut to 13.5" L, 10.375" Exposed)
TB-7 Thrust Ring (Engine block)*
PR-720 Transition (Paper Reducer), 3.0" L
ST-7180 Body tube (3.0" Inside, 0.125" Exposed)
EH-30 Engine Hook Standard-Plus*
CR-720 Centering Ring
2 - LL-130 Launch Lugs
*--Okay, so I used a TB-7 (instead of a TR-7) along with a 3.0" long engine hook, which you can cut down from an EH-38 hook. Make sure you cut the slot in *front* of the TB-7. And you can add an "outside" Hollow Tubing Coupler to secure the engine hook if you want.
Suggested motors for the original design are listed as A5-2, A8-3, and B4-2. However, RockSim lists the deployment velocity (Dv) on a B4-2 at 85 feet per second (fps)!
Motor / Calibers / Max. Alt. / Dv
A8-3 -- 4.90 -- 221 ft. -- 3.74 fps
B6-4 -- 4.61 -- 508 ft. -- 17.62 fps
C6-5 -- 3.94 -- 1027 ft. -- 13.27 fps
Enjoy!