#21
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Using CA to glue the flap did fix the burn-through problem at the nozzle. However, further tests had blistering at the delay section at 5-7 seconds and burn through at 10+ seconds. We would never have a delay that long, but it does show a potential problem with external case heating.
In cutting open many of the casings, I noticed that the layers are not glued as well as the 18mm casings made at the same time. I suspect NEPT has problems with tubes that small. We have refiitted to 18mm and will put the 10mm on hold until we have more resources (time, money) to continue trying to make them work. Thanks to all for the suggestions!
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Carl McLawhorn NAR#4717 L2 semroc.com |
#22
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Quote:
B14's, here we come!
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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 |
#23
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Mmm Yummy !
B14's !!!! Hopefully we can get them in -0,3,5, and 7 flavors. I would think the -0 then -5 would get the most use, with the -3 and -7 about equal to each other. Forget the -6 delay; that one NEVER made any sense and it always seemed like they missed the boat by NOT having a -3 I had an Astron Avenger I really liked to launch on an A8-0 to B14-5 combo. It would launch and stage low and slow then take off like a bullet once the B14 kicked in. An Astron Farside or Arrow 300 on an 1/2A6-0 or A8-0 to B14-0 to 1/2A6-4 makes for a wacky interesting flight too.
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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 ! |
#24
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Doug .
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YORF member #11 |
#25
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The casings for Apogee's 10mm motors appeared to have something impregnated in them. I don't know if they are phenolic or not. Did you ever see any of them? Have you tried things like fish paper (as in the later Quest Micro motors)?
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Roy nar12605 |
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I know Estes made a B8-3 for Centuri at one point, but not sure why the B14-3 never existed.
If blow-thru was a problem it would seem it would be even worse with the B14-0 and we all know that one worked for years. The B14-6 has always had me scratching my head though...makes NO sense unless it was specific for some competition event that made the B14-6 optimum, but I have no idea what kind of event that would be.
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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 ! |
#27
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That is, the flier would probably never notice anything unusual, as long as the staged flight was successful. But a B14-3 burning thru would be obvious since it would have a very early deployment. Doug .
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YORF member #11 |
#28
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How about a B1-7 motor?
How about a B1-7 motor? In 1997, Stuart Lodge set an altitude record that still stands. At the 1st World Air Games, held at Ankara-Golbasi in Turkey, he flew a small FAI S6A Class (single-stage streamer-recovery) model to an altitude of 1,850' (569 m) on a Delta B1-7. These Czech motors are 10.5 mm in diameter. You can see some Delta motors and other foreign-made model rocket motors here: http://homepage.mac.com/georgegassa.../Engines-F.html
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Black Shire--Draft horse in human form, model rocketeer, occasional mystic, and writer, see: http://www.lulu.com/content/paperba...an-form/8075185 http://www.lulu.com/product/cd/what...of-2%29/6122050 http://www.lulu.com/product/cd/what...of-2%29/6126511 All of my book proceeds go to the Northcote Heavy Horse Centre www.northcotehorses.com. NAR #54895 SR |
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