Movies and Films
This is the forum for Movie and Film discussions. Again, our topic is naval warfare in WWII for the most part.
Re: U-boat oddities
Posted by:
ROBERT M.
()
Date: March 11, 2004 03:35AM
<HTML>J.T., et al:
Rigging-gear used to shut the upper FTR hatch is referred to as a "jigger" and it's not the same as a "come-along." A "come-along" is used in a machine shop to position a heavy casting, or whatever, on a machine. A roller-chain "pull lift" or "Coffing hoist" is used also in this
application. And then there's the "load-binder" used by truckers to
secure their loads.
The "jigger" consists of a travelling or fall block that is attached to the load being lifted or moved and moves with the load. A standing block is a block that is fixed to a stationary object acting as the reaction point of the loading.
When blocks have equal numbers of sheaves, the becket should be on the upper or standing block. When blocks have uneven numbers of sheaves then use the bbecket on the block having the least numberf of sheaves or the travelling block.
In the case of the "jigger" that torpedomen use to tube-load a torpedo,
the travelling block has one sheave and the standing block has two sheaves, therefore the becket on the travelling block is used.
If you'll go back to the flick, you'll notice that the crewmen grab both lines and pull downward. They should be pulling on the "lead line" which cannot be seen due to the seawater coming in through the partially open upper hatch. You have to ask this question also: What was the
travelling block attached to? A torpedo skid in the pit? If so, then the torpedo that fell out of the skid, would've" pinned" the 21-thread manila lines of the "jigger", n'est-ce-pas?
A crewman states that a hatch dog is broken. That's understandable, due to the recent depth charging. As a result of these instances, an additional set of "depth charge dogs" was installed to all topside hatches with the exception of AB, AER, and Conning Tower hatches. The AB
and AER hatches were provided with "doubler" hatches installed at the bottom of the hatch trunks, and an 18-inch, "boiler-type" manhole cover was provided for access, if needed. No additional "dogs" were provided for the upper Conning Tower hatch, 'cause if it became flooded, the Safety Tank could be blown with 3,000# air, until the water was pumped
out of the pump room bilge.
There were four depth charge dogs for each hatch, and were installed
as a "Rig-for-Dive" requirement. Each one consisted of double "clevis"
ends of a short turnbuckle, pinned to welded eyes on the hatch and in the hatch trunk.
The olde nit-picker,
ROBERT M.</HTML>
Rigging-gear used to shut the upper FTR hatch is referred to as a "jigger" and it's not the same as a "come-along." A "come-along" is used in a machine shop to position a heavy casting, or whatever, on a machine. A roller-chain "pull lift" or "Coffing hoist" is used also in this
application. And then there's the "load-binder" used by truckers to
secure their loads.
The "jigger" consists of a travelling or fall block that is attached to the load being lifted or moved and moves with the load. A standing block is a block that is fixed to a stationary object acting as the reaction point of the loading.
When blocks have equal numbers of sheaves, the becket should be on the upper or standing block. When blocks have uneven numbers of sheaves then use the bbecket on the block having the least numberf of sheaves or the travelling block.
In the case of the "jigger" that torpedomen use to tube-load a torpedo,
the travelling block has one sheave and the standing block has two sheaves, therefore the becket on the travelling block is used.
If you'll go back to the flick, you'll notice that the crewmen grab both lines and pull downward. They should be pulling on the "lead line" which cannot be seen due to the seawater coming in through the partially open upper hatch. You have to ask this question also: What was the
travelling block attached to? A torpedo skid in the pit? If so, then the torpedo that fell out of the skid, would've" pinned" the 21-thread manila lines of the "jigger", n'est-ce-pas?
A crewman states that a hatch dog is broken. That's understandable, due to the recent depth charging. As a result of these instances, an additional set of "depth charge dogs" was installed to all topside hatches with the exception of AB, AER, and Conning Tower hatches. The AB
and AER hatches were provided with "doubler" hatches installed at the bottom of the hatch trunks, and an 18-inch, "boiler-type" manhole cover was provided for access, if needed. No additional "dogs" were provided for the upper Conning Tower hatch, 'cause if it became flooded, the Safety Tank could be blown with 3,000# air, until the water was pumped
out of the pump room bilge.
There were four depth charge dogs for each hatch, and were installed
as a "Rig-for-Dive" requirement. Each one consisted of double "clevis"
ends of a short turnbuckle, pinned to welded eyes on the hatch and in the hatch trunk.
The olde nit-picker,
ROBERT M.</HTML>
| Subject | Written By | Posted |
|---|---|---|
U-boat oddities
|
David W. | 03/07/2004 12:37PM |
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Re: U-boat oddities
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Vettecaster | 03/07/2004 12:48PM |
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Re: U-boat oddities
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J.T. McDaniel | 03/07/2004 06:42PM |
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Re: U-boat oddities
|
Dan Odenweller | 03/07/2004 07:40PM |
|
Re: U-boat oddities
|
J.T. McDaniel | 03/08/2004 01:40AM |
|
Re: U-boat oddities
|
Dan Odenweller | 03/08/2004 03:12AM |
|
Re: U-boat oddities
|
ROBERT M. | 03/10/2004 04:20AM |
|
Re: U-boat oddities
|
ROBERT M. | 03/11/2004 02:03AM |
|
Re: U-boat oddities
|
ROBERT M. | 03/11/2004 03:35AM |
|
Re: U-boat oddities
|
Ian Stapley | 08/06/2004 06:24PM |
|
Re: U-boat oddities
|
ROBERT M. | 08/08/2004 04:38AM |