Re: LOC Precision EZI-65 for level 1 cert motor choice

I don't know what caused your problem,it should have worked with 2 F20's. About two years ago I launched my NCR by Estes Big Brute on a F20-4. This is a short, 4 inch diameter rocket that weighed just under 30 ounces at liftoff. It wasn't a real impressive flight, just a short lob up 3 or 4 hundred feet (just guessing), but it worked. Your flight sounds more like off center thrust, or on motor slow to ignite.
Christopher Brian Deem NAR 12308 TRA 2256 level II


lizardqueen wrote:
Thomas Koszuta wrote:
Thomas, it is possible that the rod was insufficient and slowed the
take-off. It was six feet tall but a little flimsy. What diameter
should the launch rod have been? I thought that when I worked the math
F20s were underpowered. Both engines fired and I wouldn't say the
rocket was significantly heavier than 29oz. (maybe 5 oz more at very
most) The rocket went on a horizontal trajectory and hit the ground
before ejection charge. (Thankfully away from all spectators, which
were approximately 100 feet away.)

Thomas wrote:
The 4-29ss at 29 ounces should leave a 6 foot rod at 39 MPH. If both motors
lit, then your rocket was either significantly heavier than the 29 ounces,
or it was sticking to the launch rod. Even at 50 ounces, it should have
been fine at 29 mph.

.

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