#1
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'MPC B3-3s - a known 'CATO Threat?'
I recently got some old, original MPC motors in an auction and thought it would be fun to try them out. First, I tried to static-fire a B3-3 and WHAM! It blew out big time! No spit casing or anything (those cases are WAY think), just shot everything through the forward end in a heartbeat.
Undeterred, today I flew a couple of the old motors. A C6-4 (LOVE that delay time) worked like a champ. Another B3-3, however, had the same loud, fiery, destructive result. Since I never got the chance to use the original MPC products when they were being made, I wonder if anybody has heard warnings about the B3-3s. They seem to be useless except for possibly making NAR safety training videos! ("Be prepared for bad things like THIS...."). Thoughts? |
#2
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I have many MPC Minijets in my collection. For some reason all of the motors are date stamped 26 Jul 1971. At NARAM-15 in 1973 we flew a B motor event and most people used the B3-5m motors. After a series of cato's, we implored contestants not to use them, but most had built models for 13mm motors and did not have an 18mm model to fly.
So yes, the B Minijets were a known motor to fail. Chas
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Charles Russell, MSgt,USAF (ret.) NAR 9790, Lvl 1 SAM "Balls Three" |
#3
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Agreed. Lousy motors.
The Centuri B4-xM were known to be cato prone but were far more reliable than those MPC junkers. Then again, I enjoy watching other's rockets go "KABLOOEY !"
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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 ! |
#4
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I should have been clearer. My apologies.
The B3-3 motors I'm talking about are standard size 18mm motors. I don't own any minijets. Again - sorry for the confusion. Frankly I forgot all about the MPC minis! |
#5
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Have no experience with their 18mm B3s, only their awful minis.
Those made a decent M80 replacement.
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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 ! |
#6
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Quote:
How have you not flown with me yet? Every time I bring an E9 to the pads, people gather round, cameras going full blast.
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Bill Eichelberger NAR 79563 http://wallyum.blogspot.com/ I miss being SAM 0058 Build floor: Centuri Mini Dactyl Estes - Low Boom SST Semroc - Marauder, Shrike, SST Shuttle In paint: Canaroc Starfighter Scorpion Estes F-22 Air Superiority Fighter, Multi-Roc, Solar Sailer II Semroc Cyber III Ready to fly: Estes - Solar Sailer II Semroc - Earmark, Groonie Der V 1/2 |
#7
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I have never had an E9 cato... Consider them lousy low thrust motors and rarely used though.
The E12 is a much better motor.
__________________
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 ! |
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