> First flight on a A10-0T and A3-4T (I think -- whatever the recommended
> engines were, sort-of) ended in a "prang".
I built one of these recently and had a similar experience last weekend
in Manassas. I used an A10-0T and a 1/2A3-4T combo. They were taped
together snugly, etc. so they *should* have worked...but I wound up with
a bent bird after the upper stage failed to air-start. I subsequently
repaired the U/S and fired it successfully using the same motor that
didn't light in flight.
One of the other participants mentioned that the A10-0T is known for this
problem, and that due to the grain structure by the time the motor burns
out there's not enough forward pressure to send burning propellant into
the nozzle of the upper stage motor. I dunno...the booster stage seperated
with an audible "Pop". He offered me the use of an A3-0T which isn't
made anymore. I declined as I decided one prang was enough for a day...
Frankly I think in retrospect that the failure was benevolent in my case.
The booster took the rocket up a couple hundred feet, and had the 2nd
stage lit I would have had to kiss the bird goodbye! On the 2 subsequent
flights on the 1/2A single motor the lil' *** went nearly outta sight!
Anybody know why Estes doesn't offer the A3-0T anymore? It sounds like
this was a much more "reliable" booster motor. I'd love to fly the Mini-
Cobra as a 2-stage, but I don't want to try it on an A10 anymore....
o "If you push something hard enough it will fall over" o
o -- Fudd's First Law of Opposition o