Re: G motors for contest certification
- Jay Calvert wrote:
> I just sent an email to Ellis asking for clarification of the 82 grams vs.When this question came up before TARC last year, I "sacrificed" a G35
> 62.5 grams propellant question. I'll let the group know what I find out.
and weighed the propellant. It is NOT over 62.5 grams. Trip added it to
the list of allowed motors.
TRA does a simple method of weighing the motor before and after the burn
to get propellant mass. This ends up including the delay and some liner
material. That is where the higher number came from.
It is also worth noting that the raw data from the TMT tests of the Ellis
G35 have quite a bit of variability from motor to motor. This also holds
true in the flights I've done (and seen). For the intro to engineering
course we had at Syracuse University in Fall 2002, we used about 40 of them.
One catoed. I also had one that blew through the ejection charge at ignition
(20 degrees outside at the time, not sure if that had anything to do with it).
I've also seen about 4 or 5 at launches and they all worked well.
Hopefully, if Bob Ellis submits a batch to NAR S&T, the variability of
the motors will pass the stricter NAR tests.
- --- doug holverson <dholverson@...> wrote:
>For the most part, they go for what the long-time R/C
> Do these people buy something as sensible as an ARF trainer or
> do they
> gravitate to something hairier?
airplane hobbyists would call an ARF trainer. To those outside
the hobby to start with it's a pretty impressive craft that they
can yank out of the box, rubberband (or whatever) the wing to the
fuselage, attach a couple of simple linkages, and go outside to
It's once they get the hang of R/C flying that they start
thinking that they might want to tackle something a little more
involved, especially after seeing what the hobby veterans are
flying at the "local" field, and starting to ask more in-depth
questions at the hobby shop. Sensible, really, to learn the
critical skills before risking dozens of hours of craftsmanship.
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