[tccrockets] Re: Attn: Brian Dalby
- From: "James Marino" <jmarino1@xxxxxxxxxxxxx>
- To: <tccrockets@xxxxxxxxxxxxx>
- Date: Fri, 14 Oct 2011 07:40:56 -0700
Acquiring a nozzle and drilling out the throat isn't the challenge. The
issue is matching the nozzle throat and ablation characteristics to the burn
characteristics of the propellant and the grain geometry of the motor, to keep
the chamber pressure within the capabilities of the case and closures, and
still get a usable motor with desirable thrust characteristics.
Sorry. Can't help it. I'm an Rx kind of guy.
J
----- Original Message -----
From: Karl Baumheckel
To: tccrockets@xxxxxxxxxxxxx
Cc: Paul M. Pittenger
Sent: Friday, October 14, 2011 6:03 AM
Subject: [tccrockets] Re: Attn: Brian Dalby
green monkey aerospace makes small ex motor cases and nozzles. I'll bet
they'll have a throat size for you.
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From: "James Marino" <jmarino1@xxxxxxxxxxxxx>
To: tccrockets@xxxxxxxxxxxxx, "Paul M. Pittenger" <pmp42@xxxxxxxxxxx>
Sent: Friday, October 14, 2011 5:02:22 AM
Subject: [tccrockets] Re: Attn: Brian Dalby
Suggest you think and consider for a while before selecting the
nozzle for something like this. Those AT 18m D loads have some seriously small
nozzle throats.
Tripling up the grains will triple the burn surface area. To keep the
Kn ratio in the realm of the realistic, a good starting place would be to also
triple the nozzle throat area. You have some geometry homework to do... 8^)
Even then... No guarantees. Might go boom. IIRC, those are C-slot
grains.
J
----- Original Message -----
From: chvy91bowtie@xxxxxxx
To: Paul M. Pittenger ; tccrockets@xxxxxxxxxxxxx
Sent: Thursday, October 13, 2011 10:18 PM
Subject: [tccrockets] Re: [tccrockets] Re: Attn: Brian Dalby
No clue to be honest. Brian was talking to me at DA about wishing he could
put all three grains from an aerotech 18mm 3pk of reloads in one case. So I
said I can do that. Last night I finally got around to it. The case holds all
three grains and a delay grain for possible tracking. The forward closure is
plugged on this one but could use the delay and charge. Will it work? Someone
else will definately know better than I.
Sent from my HTC on the Now Network from Sprint!
----- Reply message -----
From: "Paul M. Pittenger" <pmp42@xxxxxxxxxxx>
Date: Thu, Oct 13, 2011 9:12 pm
Subject: [tccrockets] Re: Attn: Brian Dalby
To: <tccrockets@xxxxxxxxxxxxx>
Cool, that is a pretty long 18mm... what is the max impulse range?
----- Original Message -----
From: Jack Garibaldi
To: tccrockets@xxxxxxxxxxxxx
Sent: Thursday, October 13, 2011 8:36 PM
Subject: [tccrockets] Re: Attn: Brian Dalby
Have Rob do some sugar loads for you for testing.
Jack G
From: tccrockets-bounce@xxxxxxxxxxxxx
[mailto:tccrockets-bounce@xxxxxxxxxxxxx] On Behalf Of Rob Diehl
Sent: Thursday, October 13, 2011 7:56 PM
To: tccrockets@xxxxxxxxxxxxx
Subject: [tccrockets] Re: Attn: Brian Dalby
Nice!
From: tccrockets-bounce@xxxxxxxxxxxxx
[mailto:tccrockets-bounce@xxxxxxxxxxxxx] On Behalf Of Chvy91bowtie@xxxxxxx
Sent: Thursday, October 13, 2011 9:58 AM
To: tccrockets@xxxxxxxxxxxxx
Subject: [tccrockets] Attn: Brian Dalby
Brian, I finally got around to machining the 18mm hardware we talked
about back at DA. Not sure if it will work but I think it looks pretty cool. I
will bring a set to October Skies for you. The shiny object in the center is a
dime for scale.
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