AMW 75 mm nozzle washer! - Northern Colorado Rocketry

This topic has 9 replies, 4 voices, and was last updated 19 years, 8 months ago by Warren B. Musselman.

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April 30, 2006 at 6:11 am #39637
Doug Gerrard
Participant
In my preparation for MHM, I noticed the AMW 75mm casing I borrowed is missing the “nozzle washer”. Can someone bring a spare that I can borrow? I’m hoping I could get it from Wildman but I would like to make sure one is waiting for me.

I am also in need of a 1/2″ launch rod, preferably over 6′ long. I know my comments about not using rods but this is a special case for the Mars Snooper III. It wasn’t practical to use rail guides on it. I’m sure the club has one…

Doug
April 30, 2006 at 1:57 pm #42171
Warren B. Musselman
Moderator
Doug, the club most definitely has a 6′ x 1/2″ rod.

Warren
May 1, 2006 at 2:21 am #42172
denverdoc
Doug,

I have both Pro-x and Loki 75mm hardware, likely have something that will work–is the amw a full nozzle or one that fits within a sleeve?
J
May 1, 2006 at 3:32 am #42173
Doug Gerrard
Participant
It does fit in a liner but the washer goes between the nozzle and the snap ring. I estimate a 2.75″ OD and about 2″ ID and about 1/4″ thick. I think it distributes the load to the graphite nozzle. I thought about trying to make one from aluminum then reconsidered, what is the melting point of aluminum?

Doug
May 1, 2006 at 3:43 am #42174
Chris LaPanse
1200f, or several thousand below exhaust temps.
May 1, 2006 at 5:09 am #42175
Warren B. Musselman
Moderator
Doug, I have a 75mm nozzle washer for an AMW 75-6000 case. If that fits, you’re welcome to borrow it.

Warren
May 1, 2006 at 5:43 am #42176
Chris LaPanse
I can’t see why it wouldn’t – at least with all the loki hardware I’ve seen (38, 54, and 75), the rings are the same size for all the cases in that diameter. I would assume AMW is the same way.
May 1, 2006 at 9:53 am #42177
denverdoc
It does fit in a liner but the washer goes between the nozzle and the snap ring. I estimate a 2.75″ OD and about 2″ ID and about 1/4″ thick. I think it distributes the load to the graphite nozzle. I thought about trying to make one from aluminum then reconsidered, what is the melting point of aluminum?

Doug

Not sure I was clear, some of the pro-x hardward for instance have nozzle adapters, so less graphite used–sounds like Warren has you covered anyway.
JS
May 1, 2006 at 1:32 pm #42178
Doug Gerrard
Participant
Thanks everyone. I’m not that familar with other brands other than Aerotech. I’ve used AMW on a few occasions when Jim was still renting. The guy I borrowed it from says Tim is suppose to send him one (it was missing from the set he bought). I was just estimating the size from the place it is suppose to go… Thanks again.

Doug
May 1, 2006 at 4:10 pm #42179
Warren B. Musselman
Moderator
No problem Doug. I’m not using that AMW 75/6000 case this launch so I made sure I threw the ring in my range box. Just see me when you get in and I’ll have it.

Warren
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