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  #31  
Old 05-05-2009, 08:24 PM
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Mark II Mark II is offline
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Quote:
Originally Posted by Doug Sams
What all types of logic did you work with, Carl? I'm guessing DTL and RTL were the common types in the early 70s.

For me, coming out of school in 83, LS-TTL was king, and was soon replaced by FAST-TTL. I did many board designs with that back in the late 80s. That technology will always be my paradigm.

I was actually a bit saddened a few years ago when I learned that all bi-polar logic had gone by the wayside

Doug

(And no, Bill, bi-polar logic is not the term used to describe how schizophrenics think )

.

All of this "logic" talk makes me hungry for a little "Breakfast"...
"When I was young, it seemed that life was so wonderful,
a miracle, oh it was beautiful, magical.
And all the birds in the trees, well they'd be singing so happily,
joyfully, playfully watching me.

But then they send me away to teach me how to be sensible,
logical, responsible, practical.
And they showed me a world where I could be so dependable,
clinical, intellectual, cynical.

There are times when all the world's asleep,
the questions run too deep
for such a simple man.
Won't you please, please tell me what we've learned
I know it sounds absurd
but please tell me who I am.

Now watch what you say or they'll be calling you a radical,
liberal, fanatical, criminal.
Won't you sign up your name, we'd like to feel you're
acceptable, respectable, presentable, a vegetable!

At night, when all the world's asleep,
the questions run so deep
for such a simple man.
Won't you please, please tell me what we've learned
I know it sounds absurd
but please tell me who I am."
MarkII
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  #32  
Old 05-05-2009, 09:18 PM
Ltvscout Ltvscout is offline
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Quote:
Originally Posted by Mark II
All of this "logic" talk makes me hungry for a little

Ah yes, probably my favorite Supertramp album and my favorite song on the album.
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  #33  
Old 05-05-2009, 09:58 PM
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CPMcGraw CPMcGraw is offline
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Another early design for the A2. This time, a tri-cluster...

I just call it "Scruffy"...

Altitudes of 961' with a Dv of 6 FPS or less, and flies from a 36" x 1/8" rod...

Enjoy!
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  #34  
Old 05-05-2009, 10:21 PM
James Pierson James Pierson is offline
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Thumbs up Too funny
Quote:
Originally Posted by MarkII
Rocket simulations - who needs 'em? The guy over in the "Ask Mike" forum said that HE don't need no stinkin' sim program, so why should any of the REST of us use one!


Even if I had all the free parts and helpers like these boys do I would still use RockSim .


Quote:
Originally Posted by Carl@Semroc
I was wondering if I was the only one that saw the humor in that.


I didn't see the humor at first but now I do. Kinda sad though that Estes is so far behind the times.


Quote:
Originally posted by CPMcGraw
Being one of the primary targets of that short-range tactical strike I thought it was kinda funny, too. Sad, but funny...


Me too, duck and cover My favorite way to fire back is to post a new design and say " All Semroc Parts"
I wish we would of answered the other question as well.

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  #35  
Old 05-05-2009, 10:48 PM
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CPMcGraw CPMcGraw is offline
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And now for something completely different...

The new Estes Taser Twin, using an A2-0/A2-5 combination...

Not a bad combination, except for the little requirement of an 80" launch rod...
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Last edited by CPMcGraw : 05-05-2009 at 10:50 PM. Reason: Sad oopsie, didn't see the flight data in time...
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  #36  
Old 05-05-2009, 10:55 PM
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Carl@Semroc Carl@Semroc is offline
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Quote:
Originally Posted by CPMcGraw
And now for something completely different...

The new Estes Taser Twin, using an A2-0/A2-5 combination...

Not a bad combination, really!
THAT was not an intended use! Craig. I like the way you are thinking!

The only thing I worry about in staging is the .06" nozzle in the upper stage. Not a very good target. One thing we were playing with in the 70's was "doping" the entrance on upper stage engines with BP paint. May have to look at that again.
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  #37  
Old 05-05-2009, 10:58 PM
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CPMcGraw CPMcGraw is offline
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Continued...

But, if you swap the A2-0 with an A10VS-0, the results are much nicer.

Launch rod now is back within the realm of sanity. It can use a 36" x 1/8" rod, and only requires 14" of that...
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  #38  
Old 05-05-2009, 11:04 PM
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CPMcGraw CPMcGraw is offline
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Quote:
Originally Posted by Carl@Semroc
THAT was not an intended use! Craig. I like the way you are thinking!

The only thing I worry about in staging is the .06" nozzle in the upper stage. Not a very good target. One thing we were playing with in the 70's was "doping" the entrance on upper stage engines with BP paint. May have to look at that again.


My pleasure, Carl. Unfortunately, the A2-0 doesn't have enough OOMPH to get cracking, but your A10VS-0 appears to be the ticket.

If we extend the engine tube up to the base of the sustainer engine, it might constrain more of the hot particles up toward that needle hole. An internal "stuffer tube" might constrict it some more, but there does get to be a 'point of no return'.

I take it a nozzle opening of 0.06" is a 'fixed figure', and anything larger just wouldn't allow enough pressure to build in the chamber, right?

What about painting something like the coating of an igniter up into the BP area? Something that would fire a bit hotter and more quickly?
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Last edited by CPMcGraw : 05-05-2009 at 11:36 PM. Reason: That which is known to kill more cats than semi trucks...
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  #39  
Old 05-05-2009, 11:37 PM
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Mark II Mark II is offline
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Quote:
Originally Posted by CPMcGraw
And now for something completely different...

The new Estes Taser Twin, using an A2-0/A2-5 combination...

Not a bad combination, except for the little requirement of an 80" launch rod...

Yeah!! Just mount 8 feet of 1/8" steel rod onto your launch pad, and you'll be good to go!

And don't worry, that much rod won't get whipped around - I promise...

(Kind of like fly fishing with rockets! Now quick! - Everyone into that blockhouse!!!)

MarkII

P.S. I saw your subsequent mod, Craig, but you know me - I couldn't resist...
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  #40  
Old 05-06-2009, 12:36 AM
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Carl@Semroc Carl@Semroc is offline
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Quote:
Originally Posted by CPMcGraw
My pleasure, Carl. Unfortunately, the A2-0 doesn't have enough OOMPH to get cracking, but your A10VS-0 appears to be the ticket.

If we extend the engine tube up to the base of the sustainer engine, it might constrain more of the hot particles up toward that needle hole. An internal "stuffer tube" might constrict it some more, but there does get to be a 'point of no return'.

I take it a nozzle opening of 0.06" is a 'fixed figure', and anything larger just wouldn't allow enough pressure to build in the chamber, right?

What about painting something like the coating of an igniter up into the BP area? Something that would fire a bit hotter and more quickly?
Yeah, the nozzle diameter is one of the most critical factors. If it is raised to .07", performance drops about 25% or so. If you lower it to .05", performance goes up (until the cato starts.) The A10 (A13?) will have about a .165" nozzle, but it is in the booster, not in the sustainer.

That is what I mean by "doping" the entrance.
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