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Model Forum / General / Rockets / July 2004Getting there...(new project)
I completed the aft section and electronics bay on my "new" 4" rocket. The 47.625" long aft - which'll hold a 75mm 8000N-s case - weighed in at 3 pounds! wooHOO!!! I'm gambling the entire rocket may weigh as little as 7 pounds ready-to-fly sans motor case. That bad girl'll go 5600' on a J800, 9800' on an L2000 (EX) @ M1.25 and - the piéce d' resistance - 850' on an H268R. :-)> May not seem like much of an achievement but for me - a card-carrying member of Overbuilders Anonymous - it's an epiphany. I'll post some nekkid pics in the next couple days. Ummmm.... of the rocket, not of me.... :-)> > I completed the aft section and electronics bay on my "new" 4" rocket. The > 47.625" long aft - > - the piéce d' resistance - 850' on an H268R. :-)> > > May not seem like much of an achievement but for me - a card-carrying member > of Overbuilders Anonymous - it's an epiphany. ROFL http://www.rocketryforum.com/showthread.php?s=&threadid=8386 > I'll post some nekkid pics in the next couple days. Ummmm.... of the rocket, > not of me.... :-)>  SignatureJerry Irvine, Box 1242, Claremont, California 91711 USA Opinion, the whole thing. <mail to:01rocket@gte.net> Please bring common sense back to rocketry administration. Produce then publish. http://www.usrockets.com My articles valuable? Donate http://tinyurl.com/2hmgv Gene C. wrote: << I completed the aft section and electronics bay on my "new" 4" rocket. The 47.625" long aft - which'll hold a 75mm 8000N-s case - weighed in at 3 pounds! wooHOO!!! I'm gambling the entire rocket may weigh as little as 7 pounds ready-to-fly sans motor case. That bad girl'll go 5600' on a J800, 9800' on an L2000 (EX) @ M1.25 and - the piéce d' resistance - 850' on an H268R. >> Nice work, Gene! << May not seem like much of an achievement but for me - a card-carrying member of Overbuilders Anonymous - it's an epiphany. >> Heheh! That's ok, nothing wrong with building heavy early on and then paring down on successive builds. >May not seem like much of an achievement but for me - a card-carrying member >of Overbuilders Anonymous - it's an epiphany. LOL! I should start all of my posts with, "Hi, my name is Chuck, and I'm an epoxiholic." My most recent 5.5" creation, a 1.2x Upscale ARCAS, (http://www.rocketcityrocketry.com/coppermine/thumbnails.php?album=3) came in at 14 lbs (no motor), which is much better than its predecessor, the Rapier (God, rest its soul) which was packing about 4 lbs of nose weight added to the grossly overheavy airframe, http://www.rocketcityrocketry.com/coppermine/thumbnails.php?album=10&page=1. cp BTW, Gene, thanks for scaring the heck out of me for my inadvertent foray into the 'good' section of the Bronx! :-) SignatureChuck Pierce President, Huntsville Area Rocketry Association (HARA) chuck_AT_rocketcityrocketry.com > BTW, Gene, thanks for scaring the heck out of me for my inadvertent > foray into the 'good' section of the Bronx! :-) Just doin' my job, Chuck... :-)> If it was daylight, you had no problem; to coin a phrase, "they only come out at night"... > If it was daylight, you had no problem; to coin a phrase, "they only come > out at night"... Mostly... Gene, Its not too late to add some all-thread. RDH8 > I completed the aft section and electronics bay on my "new" 4" rocket. The > 47.625" long aft - which'll hold a 75mm 8000N-s case - weighed in at 3 [quoted text clipped - 9 lines] > I'll post some nekkid pics in the next couple days. Ummmm.... of the rocket, > not of me.... :-)> My rocket is almost complete (some details) and ready-to-fly weight sans motivator is 8.3 pounds, including twin RRC²s. I MAY cut the aft about 8" shorter and the fore section about 2". That would bring the overall length to ~77½". I don't like high aspect ratios but I don't like nose weight either. The buzzword on this project was LIGHT. I'm going to come in under 8 pounds but I'll still be able to fly it on a 6000N-s M. Naturally, I'll still be able to fly it on an H :-)> I'm thinking chrome (painted) fin tips with a dark metallic grey and black paint scheme. Kinda Van Goghesque. > My rocket is almost complete (some details) and ready-to-fly weight sans > motivator is 8.3 pounds, including twin RRC²s. I MAY cut the aft about 8" [quoted text clipped - 7 lines] > I'm thinking chrome (painted) fin tips with a dark metallic grey and black > paint scheme. Kinda Van Goghesque. You can cut more weight than that if you replace al the steel hardware with 6AL4V Ti alloy. I have a bunch here and you would be amazed how light it is. Not only is it ~40% lighter, you can go with sizes that are less than 1/2 as thick/large because it is so much stronger than the junk steel that we use. Of course, that's only if you are really serious about making it light. ;-) Doc SignatureDrake "Doc" Damerau www.rocketmaterials.org NEPRA President NAR Section 614 NAR 79986 L3 www.nepra.com Remove "My Shorts" to reply Doc, where did you find the Ti hardware?? I WANT SOME! :) > Doc, where did you find the Ti hardware?? I WANT SOME! :) McMaster Carr is a good place. 6Al 4V Ti is also known as "Grade 5 Titanium" Do a search on Titanium. Some of the good stuff is in the "Titanium - other" type of category. They have nuts, bolts, all-thread, plate, strip, bar, eye-bolts and all kinds of stuff. 1/8 Ti 6AL4V all thread can replace 1/4-20 all thread and will weigh only a few grams. (I'm playing with an 8" long 1/8 Ti all thread right now and I can hardly tell I have it in my hand.) You can replace about 5 pounds of typical HPR hardware with about 8 or 10 oz of Ti. Remember, the "junk steel" hardware has about 24ksi yield strength. 6AL4V Titanium has a yield strength of at least 60ksi, (Usually closer to 90ksi). Have fun! Doc SignatureDrake "Doc" Damerau www.rocketmaterials.org NEPRA President NAR Section 614 NAR 79986 L3 www.nepra.com Remove "My Shorts" to reply Doc, thanks so much! : ) When's the inaugural flight? SignatureBill Wehner TRA #08913 L2 NAR #79387 L2 METRA > My rocket is almost complete (some details) and ready-to-fly weight sans > motivator is 8.3 pounds, including twin RRC²s. I MAY cut the aft about 8" [quoted text clipped - 7 lines] > I'm thinking chrome (painted) fin tips with a dark metallic grey and black > paint scheme. Kinda Van Goghesque. |
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