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  #41  
Old 11-11-2009, 11:42 AM
stefanj stefanj is offline
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Quote:
Originally Posted by Mark II
Exactly. 1968 was when Estes changed over from using English units to metric units for their motor designations. The motor chart in the 1968 Estes catalog cross-references their motors bearing the new metric designations with their previous English equivalents. I'm not sure when NAR S&T began using metric units for motor designations, but I believe it was a couple of years before that and that Estes took awhile to change over.

MarkII


My working theory is that they waited until the motor redesign / new Mabel to introduce the Metric-themed motor codes.

I remember having a few A5 motors back in the day, but don't remember them being "different." I might have just not noticed. They (and B4 motors) were specialty items, in that you didn't see them in the hobby shops and variety stores that my friends and I bought motors from.
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  #42  
Old 11-11-2009, 04:14 PM
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blackshire blackshire is offline
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I remember the A5-2, which was one of the recommended motors for the Estes Falcon boost-glider. Is the B4 you're referring to the plugged static test motor B4-0(P) that was listed in their catalogs up until about 1969 or 1970?
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  #43  
Old 11-11-2009, 06:14 PM
stefanj stefanj is offline
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I'm speaking B4 generically. B4-2, B4-4, etc. There was even a B4-0 at one point.

The B4-x probably started out as a relabeled B.8-x, and the A5-x as a relabeled A.8-x. Old motor technology items.

Eventually the B4-x was redesigned to use the newer motor technology, and the A5 dropped.
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  #44  
Old 04-05-2019, 09:13 AM
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Gus Gus is offline
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Reviving this old thread to ask a new question.

MMI also produced “Super B6” Rock-A-Chute motors, as well as separately labeled and distinctly colored booster and sustainer motors. All of these were produced by Vern.

Does anyone have any idea how these were packaged? I’ve never seen any packaging other than the original green label box for the Brown Manufacturing motors or the colorful box for the A4 motors that appears at the beginning of this thread?

Thanks,

Steve
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  #45  
Old 04-20-2021, 06:18 AM
shockwaveriderz shockwaveriderz is offline
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Quote:
Originally Posted by Gus
Reviving this old thread to ask a new question.

MMI also produced “Super B6” Rock-A-Chute motors, as well as separately labeled and distinctly colored booster and sustainer motors. All of these were produced by Vern.

Does anyone have any idea how these were packaged? I’ve never seen any packaging other than the original green label box for the Brown Manufacturing motors or the colorful box for the A4 motors that appears at the beginning of this thread?

Thanks,

Steve


don't know about packaging but:
A4 = A.8-3
Super Type B6 = Type B.8-4
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  #46  
Old 04-20-2021, 06:20 AM
shockwaveriderz shockwaveriderz is offline
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Quote:
Originally Posted by Gus
Reviving this old thread to ask a new question.

MMI also produced “Super B6” Rock-A-Chute motors, as well as separately labeled and distinctly colored booster and sustainer motors. All of these were produced by Vern.

Does anyone have any idea how these were packaged? I’ve never seen any packaging other than the original green label box for the Brown Manufacturing motors or the colorful box for the A4 motors that appears at the beginning of this thread?

Thanks,

Steve


don't know about packaging but:
A4 = A.8-3
Super Type B6 = Type B.8-4

the A4 and Super B6 where 2 of the 4 motors used at NARAM-1 in July 1959.

That's an Estes Enterprises manufactured MMI Rock-A-Chute. These "Super" type B6 were introduced to the public by "Sam, the Spaceman" with a MMI ad in American Modeler magazine in July 1959.
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  #47  
Old 04-20-2021, 09:17 AM
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I still have a bunch of thick-walled A5 motors in both lengths.
The B4-0 was only available as a plugged B4-0(P).
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  #48  
Old 04-20-2021, 08:37 PM
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Quote:
Originally Posted by shockwaveriderz
don't know about packaging but:
A4 = A.8-3
Super Type B6 = Type B.8-4

the A4 and Super B6 where 2 of the 4 motors used at NARAM-1 in July 1959.

That's an Estes Enterprises manufactured MMI Rock-A-Chute. These "Super" type B6 were introduced to the public by "Sam, the Spaceman" with a MMI ad in American Modeler magazine in July 1959.


Terry,

Thanks so much for posting that! I've never seen that ad. May have to find a physical copy.

Steve
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  #49  
Old 04-20-2021, 09:30 PM
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BEC BEC is offline
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...and almost off topic: My maternal grandparents lived at 4106 So. Cherokee street for many many years. Unitl I looked at that ad, I had no idea MMI was so close to a place I went to every Saturday night when we lived in Denver and as often as practical after my family moved to New Mexico.....

Of course, I was coming up to my fourth birthday when that ad ran, so wouldn't have noticed/cared about MMI being that close, I suppose.

But we did, back then, live next door to a hobby shop on the other side of the city. I still have my first #1 X-Acto knife purchased there for 60 cents.

Now, back to MMI motors.
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