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  #11  
Old 01-27-2020, 05:13 PM
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Earl Earl is offline
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Quote:
Originally Posted by Shreadvector
I'll bet the 1979 Centuri motors do NOT have the deep stepped centerbore like the older motors.


I had a box of Centuri B14-6ís from 1976 and they did NOT have the deep, deep core like the older B14s had. The core was a little deeper than the average 18mm motor, but that deep, deep narrow core was not there.

I have some older Estes B14s (as well as some older Centuri labeled ones, which were probably also made by Estes) and they do have that very deep core and a very wide nozzle.

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  #12  
Old 01-27-2020, 07:06 PM
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Iíll have to get out the old motors and take some comparison pictures. They are buried at the back of a storage closet, so it might not happen this evening. The B14-0 I flew yesterday is one I had pulled out about a year ago, with the intention of flying it ďsometimeĒ once it was 50 years old.
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  #13  
Old 01-27-2020, 08:52 PM
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A buddy of mine gave me a B14-5 way back in 1969. In 1970, I stuck that sucker in my orange painted Astron Streak. I bet that thing is still in orbit, because I never saw it again.
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  #14  
Old 01-27-2020, 10:54 PM
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My eighth grade science fair project involved using a model that was a riff on a Cobra (but with a bigger payload section) which flew on three B14-5s. This would have been early 1969 (I think).

I managed to get all the way to the state science fair with it.

Iíd love to see those motors again.
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  #15  
Old 01-28-2020, 07:26 AM
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Quote:
Originally Posted by BEC
I managed to get all the way to the state science fair with it.


Wow! That was a heckuva flight to get that far!
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  #16  
Old 01-28-2020, 09:57 AM
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I have B14 motors from around 1973 that have the deep core, and later ones from 1976-1980 that have the shallow pintle-formed core.
The ones that have the shallow pintle-formed core are no different from the B8's I have.
They were just correctly re-named B8's in the early 80's.
While a B8 does provide a much better kick off the pad than any B6 or B4, the true B14 is far better.

The B8 has the same thrust profile as the C5 without the long lower sustained thrust.
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  #17  
Old 01-28-2020, 01:54 PM
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Quote:
Originally Posted by ghrocketman
I have B14 motors from around 1973 that have the deep core, and later ones from 1976-1980 that have the shallow pintle-formed core.
The ones that have the shallow pintle-formed core are no different from the B8's I have.
They were just correctly re-named B8's in the early 80's.
While a B8 does provide a much better kick off the pad than any B6 or B4, the true B14 is far better.

The B8 has the same thrust profile as the C5 without the long lower sustained thrust.


Didn't you or someone here figure out that we could bore out a C6 with the same 1973 nozzle and core dimensions and get a true B14 replica? I know I planned on trying it but never got around to it. Maybe I'll have time this summer when the humidity climbs (helps with static electricity). I can re-start tbzep Industries and put another product beside my 1/4A3-0 and 1/2A3-0 motors.
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  #18  
Old 01-28-2020, 02:38 PM
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NOT a C6 or B6 nozzle.
The B4 has the same diameter larger nozzle of the B14 and can be converted to pseudo B14s.
If you try porting/coring the propellant of a B6/C6, all you get is equivalent to an M80.
The smaller nozzle overpressurizes.
You cannot ream/drill the B6/C6 nozzle larger either. It crumbles.
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  #19  
Old 01-28-2020, 03:00 PM
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Quote:
Originally Posted by ghrocketman
NOT a C6 or B6 nozzle.
The B4 has the same diameter larger nozzle of the B14 and can be converted to pseudo B14s.
If you try porting/coring the propellant of a B6/C6, all you get is equivalent to an M80.
The smaller nozzle overpressurizes.
You cannot ream/drill the B6/C6 nozzle larger either. It crumbles.


Ah...you've jogged my memory.

I have to assume you mean the B4 has the same diameter as a pintle cored B14/B8 cause the classic B14 nozzle is huge.

To get a classic B14, you'd have to remove a pretty good amount of BP, which is why I was thinking about a C6. What I wasn't thinking about is the brittleness of the nozzle.
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  #20  
Old 02-19-2020, 08:35 PM
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I finally found my stash of old motors. Here are comparison pictures between a 1969 Estes B14-0, and a 1979 Centuri B14-0.

As most of you know, the difference is quite noticeable with these two B14s. In addition to having a larger bore, the older Estes motor also has a small diameter secondary bore that is definitely visible.

Iíve not flown one of the newer B14s, which I plan to do. Iíve also got an older B8, which will be an interesting comparison flight.
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