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Centuri KB-7 Arrow 300
This was a really quick build, the Estes Fin Alignment Guide helped make quick work of the 12 fins. A few years ago I bought this as an open kit, it was missing the fin sheets, but Semroc to the rescue! The long ST-8 was a little roughed up on one end, but the ST-7 to ST-8 centering ring for the 3rd stage engine tube is almost an inch long, so it helped take care of the issue. This is one tall an skinny rocket!
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Tim "You know, it, uh, won't fly unless somebody pushes the button." From the movie October Sky. I am SAM # 0167 NAR 98303 Southwestern Ohio Rocketry Association (SORA) #624 https://www.rocketryohio.com |
#2
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Tim could you give the body tube lengths? I looked at the plans on YORP, but Centuri gave no part numbers for the parts. |
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Huh. I'd always wondered about the fins on that model. I didn't know if they were all the same size or not. Guess now I have my answer.
And yeah, you're right, that's tall skinny, sure enough. Looking forward to seeing the paint.
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Retro-grouch |
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I built one of those back in the 80's. It flew well, but did have a tendency to weatherc o c k in a slight breeze. The cardboard fins also had a tendency to warp over time. I also noticed the first two stages were the same as the #8 booster. When I built a clone in the 90's, I sued thin basswood instead of cardboard for the fins.
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#5
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The Centuri Buck Rogers Laser Lance and one other kit went on to use this same fin set. Here's a link to an earlier thread on the Laser Lance.....see post #19 for a scan of the fin sheet. http://forums.rocketshoppe.com/show...highlight=Lance Earl
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Earl L. Cagle, Jr. NAR# 29523 TRA# 962 SAM# 73 Owner/Producer Point 39 Productions Rocket-Brained Since 1970 |
#6
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ST-8 Payload Tube is 8 inches long ST-8 Main Tube is 15.75 inches long ST-7 Engine Tubes are 3 inches long The CR-78 centering ring in my kit measured 13/16" long The plans on JimZ list all the parts and sizes. http://www.spacemodeling.org/JimZ/cen5037.htm
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Tim "You know, it, uh, won't fly unless somebody pushes the button." From the movie October Sky. I am SAM # 0167 NAR 98303 Southwestern Ohio Rocketry Association (SORA) #624 https://www.rocketryohio.com |
#7
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I have the decals in red but if you select a different paint scheme I can change the color for you.
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"I'm a sandman. I've never killed anyone. I terminate runners when their time is up." Logan from "Logan's Run" http://sandmandecals.com/ |
#8
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I considered paper laminated 1/16" balsa. But I went ahead and ordered the Semroc fiber fins. The Semroc fins are pretty rigid, so I have hopes for them.
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Tim "You know, it, uh, won't fly unless somebody pushes the button." From the movie October Sky. I am SAM # 0167 NAR 98303 Southwestern Ohio Rocketry Association (SORA) #624 https://www.rocketryohio.com |
#9
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Anyway, I'm glad you're building this. I keep resisting the temptation to start a clone, knowing I already have enough projects going, most of them in extended duration limbo Doug .
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YORF member #11 |
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Always wanted an Arrow 300 as a kid but never built one. Might have to make a BT60 or BT70 upscale for 24mm power my next project.
Would be neat on an E12 to E12 to E12 full stakk.
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When in doubt, WHACK the GAS and DITCH the brake !!! Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't ! Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY. ALL systems are GO for MAYHEM, CHAOS, and HAVOC ! |
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