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  #21  
Old 01-06-2007, 05:00 PM
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Carl@Semroc Carl@Semroc is offline
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Quote:
Originally Posted by Mark+3
Fun stuff, I hope the S makes it onto the first run.
It will be a post-production part, so it should be. All the "S" engines I saw were cut from standard engines.
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Last edited by Carl@Semroc : 01-06-2007 at 07:39 PM.
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  #22  
Old 01-06-2007, 05:10 PM
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CPMcGraw CPMcGraw is offline
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Quote:
Originally Posted by Mark+3
...I see no need to complicate things with another diameter...


Well, Carl DID mention it...

...And I actually like the variety in power / weight ratios such a size range can offer. Reducing the mass of the casing while retaining the same (or similar) power can mean extra altitude or extra payload for a given set of designs. That's the real upshot here -- better designs taking advantage of a better variety of motors. We've been motor-starved for so long, we don't really know what it's like to have a smorgasbord to choose from!
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  #23  
Old 01-06-2007, 05:14 PM
Mark+3 Mark+3 is offline
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Quote:
Originally Posted by Carl@Semroc
I twill be a post-production part, so it should be. All the "S" engines I saw were cut from standard engines.


Carl, just as an historical note, I have an original tube of Estes S motors that have the same I.D. as the mini "T" motors with a really thick wall to get to 18mm.

This is NOT the way I would like to see them manufactured, as it adds unnecessary weight.
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  #24  
Old 01-06-2007, 05:25 PM
Mark+3 Mark+3 is offline
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Quote:
Originally Posted by CPMcGraw
Well, Carl DID mention it...

...And I actually like the variety in power / weight ratios such a size range can offer. Reducing the mass of the casing while retaining the same (or similar) power can mean extra altitude or extra payload for a given set of designs. That's the real upshot here -- better designs taking advantage of a better variety of motors. We've been motor-starved for so long, we don't really know what it's like to have a smorgasbord to choose from!


I agree, I was just hoping the same thing could be done with "S" size. A lighter weigh package package that utilizes the ST-7/BT-20 we are already using. These could be great for your Schoolyard Sounders.
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  #25  
Old 01-06-2007, 05:35 PM
James Pierson James Pierson is offline
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Question What are these motors?

Ok all you rocket experts this is some off the wall motors I have ended up with.

1/2 A6-2 18mm?? about 20 years old that a buddy bought in a box at a garage sale.
What are the good for and are they worth making again?

Also have, but cannot find, some ?Black Diamond? maybe B16-4 18mm in a black and blue colored two pack of motors. What about these?

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  #26  
Old 01-06-2007, 05:53 PM
Mark+3 Mark+3 is offline
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Quote:
Originally Posted by James Pierson
Ok all you rocket experts this is some off the wall motors I have ended up with.

1/2 A6-2 18mm?? about 20 years old that a buddy bought in a box at a garage sale.
What are the good for and are they worth making again?

James Pierson
NAR# 77907


This is the "S" size 18 X 45mm "Short" series motor. See previous posts.
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  #27  
Old 01-06-2007, 05:55 PM
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I'm happy to see someone brought up the "Shorty's". I'd love to fly my FireFly as God intended it to be flown. ;-)

Now, regarding motor sizes. I like to be able to fly multi-stage rockets in a smaller field. I'd like to see either the 1/2A6-0 and/or A8-0 boosters come back. Those are nice for three stagers. Use a B14-0 in the first then one of the two listed above in the second. For the third stage, either a 1/2A6-4 or an A8-5. The kids can be wowed with a three stage flight and you can easily get all the parts back.

Another cool motor I thought was the A5 series.

A long burn 18mm in the 114mm length would be neat.

Since Rocketflite still does not seem to be close to coming back, how about making some BP motors with sparky effects? I'm not sure if you were planning on going up to 38mm size with BP or not, but those H BP motors Rocketflite made were pretty slick.
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  #28  
Old 01-06-2007, 05:57 PM
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Quote:
Originally Posted by Mark+3
This is the "S" size 18 X 45mm "Short" series motor. See previous posts.

They made the 1/2A6 size in both 45mm and 70mm. I have both in my collection.
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  #29  
Old 01-06-2007, 06:08 PM
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CPMcGraw CPMcGraw is offline
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Quote:
Originally Posted by James Pierson
...1/2 A6-2 18mm?? about 20 years old that a buddy bought in a box at a garage sale.
What are the good for and are they worth making again?


Depends on which version you have, James. Estes produced both a standard and a short for a few years (late 1960s into early 1970s). Which do you have?

If they're the "S" version, check out the Estes Star Blazer, K-31, and the Estes Beta, K-45.

Also, check out the original Centuri FireFly, KA-6.

If they're the standard version, that one was called out for the Estes Scout, K-1, Mark and Mark II, K-2 and K-2A, Sky Hook, K-8, Aerobee 300, K-17, and likely many other lightweight designs.
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  #30  
Old 01-06-2007, 06:23 PM
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I forgot this one. How about bringing back the old Cox D8 series?

Or, how about showing Estes how to make a D13 that doesn't cato?
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