#71
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hi all,
Some small progress, both cannons and the gratings. Next is the structure that supports the roof. cheers Jim |
#72
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Nice work with the guns Jim.
It looks like they were designed to slide forward and backward on tracks. What was the purpose for that? Mike Last edited by Michael Mash; 09-17-2020 at 06:00 PM. |
#73
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thanks Mike,
Although they are monster guns, 11 in bore, they are not breach loaders so have to be retracted into the turret to be loaded. The odd thing is that no mechanism is shown to control the recoil. I assume that it is just omitted on the model. BTW the left one is a little crooked. I have to fix that. cheers Jim |
#74
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Nice build of the guns Jim.
See you picked up on the recoil question! The design of the Dalhgren guns was actually quite advanced, the recoil being controlled by a built-in friction mechanism. This was adjusted by use of wheels to reduce or increase the friction. The wheels are shown on the model on the sides of the gun carriages just in front of the trunnions (see picture below). The system was very effective. The use of the friction mechanism also provides the reason for the iron rail mounts - as opposed to one of the the more "normal" type of mountings used. When the initial test firing was talking place, the wheel was were turned the wrong way, loosening the friction. The guns when fired then hit the back of the turret on recoil, leaving two dents on the turret wall that stayed with the ship! So don't forget to model these if you want to be 100% accurate!!!! P.S. Historians believe this was the first ever example of a revolving turret on a ship.
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The SD40 is 55 now! Last edited by Kevin WS; 09-18-2020 at 02:11 AM. |
#75
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Thanks Kevin and for the information on the recoil mechanism.
I actually went hunting before reading your post and found only one picture of a gun with a visible recoil and it was a rope. Probably a test with the rope as a backup. BTW I previously said that the roof support was next. Actually this is the turret suspension, IE it hangs from the central pillar. cheers Jim |
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#76
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The inner turret surface and the suspension structure.
There is a chicken/egg situation here. Do you build the cannon and they try to make it poke out of the turret opening or put the turret skin on and build the cannon to fit the opening. Builders choice. cheers Jim |
#77
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Suspension structure-that's for the winch for bringing cannon charges from below thru now grated floor openings?Was powder magazine directly below turret?
I thought roof supports would be reinforced to have pulley system anchor for just that. That's very fine work.Thank you again. |
#78
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Quote:
There is no bearing under the turret - roller bearings not invented yet. I believe that the turret rests on the deck and is temporarily raised so it can be rotated. The two openings in the turret floor can be aligned with one opening in the deck that leads to a ladder in the crew space. That would have to be the closest thing to a magazine. cheers Jim |
#79
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The turret is finished in the way I plan to display it, IE open at the top.
The shutters keep the enemy shot from coming in. I plan to display it next to the hull on a post, a dowel, using the under support structure sort of like the last picture. Displaying this model is a problem because there are so many internals. I am thinking of making another turret as external surfaces only and mounting that on the deck, along with the stacks and pilot house armor. Then mounting the deck behind and above the hull as if it was opened on a hinge. This would display all of that beautiful framing and the deck top could still be visible if the case has a mirror back. cheers Jim |
#80
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Sort of like a cigar box? Good solution. I had considered something similar on my Toppi Saloon, but I never got it to work out. Good luck. I think that solution might work better on this than on my model
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A fine is a tax when you do wrong. A tax is a fine when you do well. |
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