[ARC5] Degaussing Field and B-18's

Wed Jan 4 13:59:16 EST 2012

I recall reading that the degaussing for ships in WWII was a pretty quick 
and dirty affair.  They ran up to a dock and slapped a wire on the hull and 
that was that.   Would doubt if the subs would use anything different.,  And 
I don't think that degaussing helps when it comes to avoiding MAD.  You are 
detecting a metal object moving in the Earth's magnetic field and not the 
magnetism in the ship.

Both the US and the Germans deployed homing torpedoes based on the use of 
sound in WWII. torpedoes, but attempts to use magnetic detection for 
detonation were a disaster.

I'm wondering, since the B-18s were outfitted with Radar for ASW, if the
> electrical systems were upgraded to handle the extra loads?  The radar
> probably operated on 80 or 115VAC at 400 or 800 cycles, but would the
> DC system have to have been upgraded to 28V as well?

My thoughts exactly.  But that would have required different generators be 
installed in the airplanes, which is not hard to do, as well as new 
batteries.  I guess the existing wiring would have worked and the new 
electronics would have required new wiring anyway.

Those aircraft did not have AC systems built in and suitable inverters would 
have to be added if the radar required that.  Rotary inverters were pretty 
much standard aircraft equipment after the war (even the Thor missile had 
them) and the jets adopted IGDs built into the engines that produced AC and 
DC.  Interesting fact about the early U-2; they dispensed with the drives to 
save weight and ran the AC power at whatever the engine happened to produce 
at any given time.

Anyone know how much power we are talking about for a early radar?  I do not 
recall reading where the RAF having to do anything  to the Blenheims they 
modded for AI radar.

Wayne

----- Original Message ----- 
From: <arc5-request at mailman.qth.net>
To: <arc5 at mailman.qth.net>
Sent: Wednesday, January 04, 2012 1:15 PM
Subject: ARC5 Digest, Vol 96, Issue 10

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> Today's Topics:
>
>   1. Re: Aircraft B-18A Bolo (Jack Antonio)
>   2. BC-454 Part Needed (k7mks at comcast.net)
>   3. Re: Aircraft B-18A Bolo (Mike Feher)
>   4. Re: Aircraft B-18A Bolo (J. Forster)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 04 Jan 2012 12:43:34 -0500
> From: Jack Antonio <scr287 at att.net>
> Subject: Re: [ARC5] Aircraft B-18A Bolo
> To: arc5 at mailman.qth.net
> Message-ID: <4F048FC6.2090002 at att.net>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> On 1/3/2012 2:46 PM, Mike Morrow wrote:
>
>> The B-18A dates from 1937 and 1938.  I assume it used a 12 vdc electrical
>> system.
>
> I'm wondering, since the B-18s were outfitted with Radar for ASW, if the
> electrical systems were upgraded to handle the extra loads?  The radar
> probably operated on 80 or 115VAC at 400 or 800 cycles, but would the
> DC system have to have been upgraded to 28V as well?
>
> The reference I have says that 122 (out of a total of about 300)
> B-18s were equipped with "ASV radar and MK IV MAD" but I'd guess ASV
> refers to the acronym rather than an equipment type.
>
> Jack Antonio WA7DIA/4
>
>
> ------------------------------
>
> Message: 2
> Date: Wed, 4 Jan 2012 17:50:00 +0000 (UTC)
> From: k7mks at comcast.net
> Subject: [ARC5] BC-454 Part Needed
> To: arc5 at mailman.qth.net
> Message-ID:
> <589705264.270337.1325699400917.JavaMail.root at sz0115a.emeryville.ca.mail.comcast.net>
>
> Content-Type: text/plain; charset=utf-8
>
>
>
>
> Need the working 3 section RF-Osc-Mix plug-in ?coil assy from a 3-6 Mc 
> BC-454B.
>
> ?
>
> Thank you,
>
> ?
>
> Joe k7mks
>
> ------------------------------
>
> Message: 3
> Date: Wed, 4 Jan 2012 12:53:48 -0500
> From: "Mike Feher" <n4fs at eozinc.com>
> Subject: Re: [ARC5] Aircraft B-18A Bolo
> To: "'Jack Antonio'" <scr287 at att.net>, <arc5 at mailman.qth.net>
> Message-ID: <[email protected]>
> Content-Type: text/plain; charset="us-ascii"
>
> In this case, I can understand how they could be used for ASW if MAD was a
> Magnetic Anomaly Detector. Obviously, as pointed out to me in other posts,
> when a sub is on the surface regular Radar will work as with a periscope,
> but a return from a periscope would be pretty small back then. However, 
> when
> I think of ASW I was thinking when submerged. I worked/designed ASW 
> systems
> for about 20 years. 73 - Mike
>
> Mike B. Feher, N4FS
> 89 Arnold Blvd.
> Howell, NJ, 07731
> 732-886-5960
>
>
> -----Original Message-----
> From: arc5-bounces at mailman.qth.net [mailto:arc5-bounces at mailman.qth.net] 
> On
> Behalf Of Jack Antonio
> Sent: Wednesday, January 04, 2012 12:44 PM
> To: arc5 at mailman.qth.net
> Subject: Re: [ARC5] Aircraft B-18A Bolo
>
> On 1/3/2012 2:46 PM, Mike Morrow wrote:
>
>> The B-18A dates from 1937 and 1938.  I assume it used a 12 vdc
>> electrical system.
>
> I'm wondering, since the B-18s were outfitted with Radar for ASW, if the
> electrical systems were upgraded to handle the extra loads?  The radar
> probably operated on 80 or 115VAC at 400 or 800 cycles, but would the DC
> system have to have been upgraded to 28V as well?
>
> The reference I have says that 122 (out of a total of about 300) B-18s 
> were
> equipped with "ASV radar and MK IV MAD" but I'd guess ASV refers to the
> acronym rather than an equipment type.
>
> Jack Antonio WA7DIA/4
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> ------------------------------
>
> Message: 4
> Date: Wed, 4 Jan 2012 10:11:52 -0800 (PST)
> From: "J. Forster" <jfor at quikus.com>
> Subject: Re: [ARC5] Aircraft B-18A Bolo
> To: "Mike Feher" <n4fs at eozinc.com>
> Cc: 'Jack Antonio' <scr287 at att.net>, arc5 at mailman.qth.net
> Message-ID: <64073.12.6.201.2.1325700712.squirrel at popaccts.quikus.com>
> Content-Type: text/plain;charset=iso-8859-1
>
> Does anybody know how the degaussing coil current was set for subs? Did
> they send somebody out in a rubber boat with a magnetometer to do a
> far-field survey?
>
> -John
>
> ==============
>
>> In this case, I can understand how they could be used for ASW if MAD was 
>> a
>> Magnetic Anomaly Detector. Obviously, as pointed out to me in other 
>> posts,
>> when a sub is on the surface regular Radar will work as with a periscope,
>> but a return from a periscope would be pretty small back then. However,
>> when
>> I think of ASW I was thinking when submerged. I worked/designed ASW
>> systems
>> for about 20 years. 73 - Mike
>>
>> Mike B. Feher, N4FS
>> 89 Arnold Blvd.
>> Howell, NJ, 07731
>> 732-886-5960
>>
>>
>> -----Original Message-----
>> From: arc5-bounces at mailman.qth.net [mailto:arc5-bounces at mailman.qth.net]
>> On
>> Behalf Of Jack Antonio
>> Sent: Wednesday, January 04, 2012 12:44 PM
>> To: arc5 at mailman.qth.net
>> Subject: Re: [ARC5] Aircraft B-18A Bolo
>>
>> On 1/3/2012 2:46 PM, Mike Morrow wrote:
>>
>>> The B-18A dates from 1937 and 1938.  I assume it used a 12 vdc
>>> electrical system.
>>
>> I'm wondering, since the B-18s were outfitted with Radar for ASW, if the
>> electrical systems were upgraded to handle the extra loads?  The radar
>> probably operated on 80 or 115VAC at 400 or 800 cycles, but would the DC
>> system have to have been upgraded to 28V as well?
>>
>> The reference I have says that 122 (out of a total of about 300) B-18s
>> were
>> equipped with "ASV radar and MK IV MAD" but I'd guess ASV refers to the
>> acronym rather than an equipment type.
>>
>> Jack Antonio WA7DIA/4
>> ______________________________________________________________
>> ARC5 mailing list
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>> Please help support this email list: http://www.qsl.net/donate.html
>>
>>
>
>
>
>
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> End of ARC5 Digest, Vol 96, Issue 10
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