I just restocked on C5's from AC Supply.
20 paks should last a while. I think I have about 30 paks now, 10 vintage, all GOOD (non cato) date codes.
I'm down to FAR fewer B14's and B8's. Hope those are coming.
The B8 should be easy. Same nozzle as B4/C5, using the C5 pintle-core in the press.
I know asking for real DRILLED B14's may be asking too much....as I beat that DEAD HORSE again....

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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, TURMOIL, FIASCOS, and HAVOC !

Recognition that you have a problem is the first sign of healing. Good!

__________________
Roy
nar12605

Would really like the drilled-core .3sec-burn B14 back, but in reality, the B8 would suffice.

Back in the 60's for a couple years Estes actually produced a B16 that had a .07sec-burn time.
Never had nor saw any, but would really like to try one.
Those must have been really mortar-like.

That B16 was rated under the OLD pound-system, not Metric. Produced 16lbs thrust for .07sec. Last offered in 1961. That would be like a B60-x in modern metric rating.
Wonder how reliable those were ?

__________________
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, TURMOIL, FIASCOS, and HAVOC !

Hate to break it to ya, but the B16 was due to testing anomalies... I.e. Vern was using an un-damped small postal scale and a stop watch! No proper test stand. No NAR S&T back then! They were really the B3 motors once proper testing and recording were done.

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Roy
nar12605

Good info, Roy.
Did not know that about the B16.
That thing sounded too hot to be contained by 18mm cardboard tubing.

__________________
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, TURMOIL, FIASCOS, and HAVOC !

from the mouth of Vern Estes himself:

"IF YOU WERE WONDERING about the change in Series II engines from В16 to В3
Whether the two "are the same engine, or if there is a difference, you are entitled to a bit of explanation.
The two engines are the same.
The change came about for for several reasons.
The original В16 engines had a slightly higher peak thrust, but were less reliable, and sо they werе slоwed down a little.
The rest of the change came about by using static test equipment which was designed to handle the
thrust given by the Series II engines. Thе оriginal tests werе made with the stand designed for Series I engines, and it just couldn't react fast enough to tell us exactly what the engine was doing.
When yоu consider that the thrust rises to over nine pounds aпd then drops back to zero in less than .35 second, the problem in measuring is understandable."

The 1st pic below is the 1st T-T curve from the B3 from the 64 Estes catalog....the 2nd & 3rd I stole from another post.... NOW that's a Core!

Ed Brown once told me about the type of drill bit and the drill speed for drilling out the cores but I never wrote it down nor do I remember.

you're welcome

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"Old Rocketeer's don't die; they just go OOP".....unless you 3D print them.

I just read his description of the test stand between the postal scale and probably his brother Earl's electronic equipment. It was damped but with anti-freeze, which doesn't seem viscous enough, but then I'm not an engineer. Or maybe anti-freeze was thicker in 1960 than it is now!

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Roy
nar12605

In that 3 parts series, "The Golden Age Of Model Rocketry", Vern stated that he was using a postal scale , that GHS had been using, but it wasn't very accurate, so he built a mechanical T-T stand .
His quote above us from a very early MRN.

But to GH's post, if they are now making C5, there's no reason not to make B8.... if I'm not mistaken, the two cores were identical back in the day.... they just have to program Mabel to not put as much BP in the case....everything else is the same.
Compared to the old C5-3, this new one is almost 2 Ns less Total Impulse than the old one. 2 Ns more Avg thrust....

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"Old Rocketeer's don't die; they just go OOP".....unless you 3D print them.

A B8-0 and C5-0 would be fantastic. I'm down to my last pack of C5-0S motors (Centuri).

__________________
Paul
If we weren't all crazy, we would go insane - Jimmy Buffett
NAR #87246 www.wooshrocketry.org

I wish they would re-release the C5-0 as well.
I only have two C5-0s left.
Have actually far more B8-0 and B14-0 motors in my hoard.
Up until 2010 I flew at least one B14 and a couple B8's per year.
Have not flown any of those since about 2010

__________________
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, TURMOIL, FIASCOS, and HAVOC !