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Almost all the PNC cones from Centuri are about .2 or .3 inches shorter than the original balsa ones. The ogive balsa cones were not very "mass producable" in plastic so the sharp tip was rounded, making the length shorter. They never went back and updated the kit overall lengths (or weights) on all the ones I checked that migrated from balsa to plastic nose cone.
Centuri nose cones
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Carl McLawhorn NAR#4717 L2 semroc.com |
#12
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That makes complete sense. I forgot about the "rounded tips" on the plastic ones. Craig... |
#13
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Guess what Centuri clone just popped onto my build and review list? Do you guys have any other tricks up your sleeves?
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Bill Eichelberger NAR 79563 http://wallyum.blogspot.com/ I miss being SAM 0058 Build floor: Centuri Design Contest F-150 Hurricane Estes - Low Boom SST Semroc - Gee'Hod, Shrike, SST Shuttle In paint: Canaroc Starfighter Scorpion Estes F-22 Air Superiority Fighter, Solar Sailer II Semroc Cyber III Ready to fly: Estes - Multi-Roc, Solar Sailer II Semroc - Earmark, Snake Jumper |
#14
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Laser cut fin sets are now available. (Bill and Jay... the 137% upscales are also available) Ask Sheryl.
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Carl McLawhorn NAR#4717 L2 semroc.com |
#15
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Wow! Thanks for all the information - and the fin patterns. This is great!
Carl, I will be sending an order your way soon
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Up next: Under construction: Under repair: In finishing: Centuri Sabre clone In primer: In paint: Ready for decals: Bill Cooke NAR #31312 TRA #19705 SAM #0001 Huntsville, AL My rocket blog My rocket fleet |
#16
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I built two of these "back in the day", and if I remember correctly, the shock cord attachment was the cut-a- slit-and-tie method. I would have traced patterns and taken measurements at the time, but never could have conceived of cloning and the type of information exchange we have available now.
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John Lance Ladd Yoyodyne Propulsion Systems Grovers Mill, NJ Established 1938 lladd.netau.net |
#17
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Here's a pic of my original kit. The decals are pretty bad. I should have used solveset on them. Anyways, I'm not sure how well you can tell by the photo, but the Stiletto used an external coupler that was glued onto the top of the booster tube with two "pass-port" holes punched in the top where it slipped over the base of the sustainer tube. That's why the fins have those notches. I can take a photo of my kit tonight with the stages seperated. Also the booster had a thrust ring in the base similar to the Estes CC Express. Do you have this tube joiner Carl? Also, I'm very interested in that 137% upscale
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Quando Omni Flunkus Moritati |
#18
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That would be the HTC-7B coupler. I have a bunch of originals here, but I'm sure others would like these available as a mass-produced item. Do you have these available yet Carl, or plans to make them? Thanks for that Centuri>Semroc Cone Reference List. That really helps a lot. BTW, the Black Widow also used that HTC-7B coupler.
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Scott D. Hansen Ye Olde Rocket Shoppe - Your One Stop BAR Shoppe! Ye Olde Rocket Plans - OOP Rocket Plans From 38 Companies! Ye Olde Rocket Forum WOOSH NAR Section #558 |
#19
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We have them! Hollow Tube Couplers
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Carl McLawhorn NAR#4717 L2 semroc.com |
#20
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Thanks, Bill! You will get two slightly different sets of the 137% upscale fins. The first has the cutouts for an external coupler which is not needed and the second is clean along the root edge with no cutouts. Let us know how it turns out!
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Carl McLawhorn NAR#4717 L2 semroc.com |
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