#21
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I like the Estes E16 and F15 29mm BP motors, but an E35 or F40 in the same SU BP format would be far more useful. All it would take is a pintle in the nozzle when the BP core is pressed into the casing. Would be similar to the old C5/B8 18mm motors- "semi" port-burning without the hazard of drilling cores like the old B14. It was easily done in the 60's and 70's...it could be done far easier and more safely now with automated controls. Why it is not done is a bunch of hogwash EXCUSES.
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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 ! |
#22
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Yes! Even a relatively tame F24 would be welcome. An F24-0 would give a nice kick to two-stage models.
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NAR #27085 - Oregon Rocketry - SAM |
#23
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Quote:
Anyway, using these motors, the challenge is to either build very light, or build a cluster to get the rocket in the air with authority. A lightly built rocket on an F15 might need to have intentional drag added to keep in recoverable. And a cluster has the challenge of getting them all lit, but that's manageable - I've had success with several rockets that use a larger central motor with multiple smaller outboards. And that's pretty much how I have envisioned using the 29mm Estes E and F booster motors. Doug .
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YORF member #11 |
#24
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The Estes Catalog reccomends an E16-8 for the Mammoth which I think would eject way late. The max liftoff weight of the E16-8 is an optimistic 14oz, and the Mammoth is 13.3 according to the Catalog.
Does anyone have an actual weight for their Mammoth? Has anyone tried the E16-8 in a Mammouth? Can anyone tell me what motors the instructions reccomend? |
#25
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I weighed my Mammoth a few years ago and seem to remember it tipping the scales at about 14 oz. I first flew it on an F15-8, but then switched to F15-6s. The shorter kits like the Prowler, Trajector, or Majestic would be OK on the F15-8. It’s also the engine I have used in my Star Orbiter.
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Lee Reep NAR 55948 Projects: Semroc Saturn 1B, Ken Foss Designs Mini Satellite Interceptor In the Paint Shop: Nothing! Too cold! Launch-Ready: Farside-X, Maxi Honest John, Super Scamp |
#26
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Good to know, I wonder if anyone has flown it on the catalog E16-8.
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