Published: | 2010-11-13 |
Manufacturer: | Apogee Components |
The following excerpt is
from "Sport Rocketry". The intention is to allow guests to get a
basic feeling about a kit. We strongly suggest that you get a copy of the
referenced Sport Rocketry and read the entire article. Inside you will find
many helpful hints in construction as well as other useful information. For
more information, use the two links above.
"More
commonly called "micro motors" due to their slim 10.5 millimeter
diameter . . ."
"The small diameter of the Apogee motors allows smaller diameter rockets
with less drag for increased altitude performance."
". . . the motors use black powder propellant (not composite) . .
."
"The Apogee A2 motors had an average total impulse of 2.31 N-sec,
plus-or-minus only 0.01 N-sec - a very tight tolerance."
"The small nozzle of the Apogee motors makes them difficult to
ignite. I had a 40% misfire rate using the Power Punch igniters supplied
with the motors."
"Late-breaking results from NARAM 38: . . . Most competitors were very
frustrated with the motors due to the high misfire rate and the large number of
lost tracks."
"Apogee sells body tubes, centering rings, and nose cones for the 10.5mm
motors."
The entire article gives the impression is that these new motors will have significant effects on competition rocketry, but that there are some reliability issues to work out.
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K.K. (September 1, 1999)