[Milsurplus] ART-13 or ATC question

[Bill Carns]

Back in 1941, when the US Navy had the run off for the contract development
of the next Navy Flight HF Transmitter, (Can anyone tell me - or where to
find), who were the other three companies that were involved in the proof of
concept demo, what were their transmitter numbers, what did they look like?
and were any of them ever taken further into development and manufacturing??


Any info would be helpful.  Any pictures ?? 

Thanks,

Bill
N7OTQ

-----Original Message-----
From: milsurplus-bounces at mailman.qth.net
[mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of Gary Pewitt
Sent: Thursday, April 11, 2013 2:07 PM
To: Mike Morrow
Cc: milsurplus at mailman.qth.net; Mike Morrow
Subject: Re: [Milsurplus] OT: Loss of USS Thresher, SSN-593 - One-Half
Century Today

Yes after the Thresher disaster the Subsafe program was adopted and among
-many- requirements was "J" threads on all high pressure valves.  
J threads have a radius on both the point and root of the threads to
eliminate stress risers causing cracks that can lead to cracking at
supersonic propagation speed.  Subsafe is still one of the most stringent
quality assurance programs.



On 4/10/2013 7:00 PM, Mike Morrow wrote:
> Jerry wrote:
>
>> It sank because the manufacturer PUT VALVES IN BACKWARDS !!!
>> Sea water pressure opened them rather than sealing them.
> The information I learned from five years as an engineering officer on 
> a submarine with engineering systems almost identical to Thesher's (no 
> post-Thresher modifications) points to a failed brazed seawater 
> connection, most likely in the auxiliary machinery space containing 
> all of the HV electrical switch-gear.  There was never any allegation 
> of improper valve orientation contained in the final investigation
results.
>
> Mike / KK5F
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-- 
Gary Pewitt   N9ZSV
1500 French Prairie Rd
Booneville, AR  72927

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