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1:72 USS Mitscher DL2 http://shipmodels.info/mws_forum/viewtopic.php?f=13&t=154556 |
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Author: | Mickosh3 [ Mon Nov 25, 2013 12:41 pm ] |
Post subject: | Re: 1:72 USS Mitscher DL2 |
Hi, Gav! Congratulation with your new steel project! It is a interesting method. Could you, please, make a very close picture of welding row on the ship frame? With best regards- Anatoly |
Author: | badkeson [ Mon Dec 02, 2013 12:33 am ] |
Post subject: | Re: 1:72 USS Mitscher DL2 |
Hey All, Well another instalment at last. I have done some welding and have welded the Fairing line , bulkheads and keel together and then welded half of the rib caps on so far. The ribs caps all need the oxy put on them to true them in yet, so, thus far, this is raw work and not finished off yet. Attachment: Attachment: Attachment: Attachment: I will be putting in the engine mounts soon and the gearbox mount before the skin goes on. Till next time... Gav |
Author: | Goodwood [ Mon Dec 02, 2013 12:54 am ] |
Post subject: | Re: 1:72 USS Mitscher DL2 |
I foresee a truckload of Bondo in your future—just kidding! It looks really good so far, and it does seem to make more sense to make such a ship in that scale out of steel rather than wood and fiberglass. Lasts longer, is generally sturdier, and you don't have to put in quite as much effort to get it watertight. For all I know (which isn't much), a steel hull might be lighter than a wooden one since you don't have to reinforce it nearly as much. But then, this is the rambling praise of a total n00b! ![]() |
Author: | badkeson [ Mon Dec 02, 2013 3:41 am ] |
Post subject: | Re: 1:72 USS Mitscher DL2 |
Goodwood wrote: I foresee a truckload of Bondo in your future—just kidding! It looks really good so far, and it does seem to make more sense to make such a ship in that scale out of steel rather than wood and fiberglass. Lasts longer, is generally sturdier, and you don't have to put in quite as much effort to get it watertight. For all I know (which isn't much), a steel hull might be lighter than a wooden one since you don't have to reinforce it nearly as much. But then, this is the rambling praise of a total n00b! ![]() G'day Goodwood, I am just experimenting. I like the idea of pushing the boundaries and seeing what I can do, so far, so good. ![]() ![]() ![]() My attempt to get it watertight will be to use solder to join the hull plates to the rib caps, the hull plates will be 1mm steel plate and I factored this thickness in when cutting out the bulkheads, so committed there. ![]() ![]() ![]() Regards, Gav |
Author: | Mickosh3 [ Sat Dec 07, 2013 12:53 pm ] |
Post subject: | Re: 1:72 USS Mitscher DL2 |
Hi,Gav! Thank you for pictures. The method you selected is more then impressive! With best wishes - Anatoly |
Author: | badkeson [ Fri Dec 20, 2013 12:10 am ] |
Post subject: | Re: 1:72 USS Mitscher DL2 |
Mickosh3 wrote: Hi,Gav! Thank you for pictures. The method you selected is more then impressive! With best wishes - Anatoly Thanks Anatoly, Still haven't trued it all up, have been building the steam engine, about half way through it at the moment. Am building 2, a spare. No pics at present as I haven't got anything assembled. I am getting a set of taps and dies for 2, 2.5 and 3mm bolts, the wife is getting them for me for Christmas, so I am just making parts and will start assembly soon.... Just have to hope it works ![]() So will post some pics soon. Have a safe and Merry Christmas all and I look forward to catching you all early in the New Year. Regards, Gav |
Author: | DrPR [ Fri Dec 20, 2013 1:49 am ] |
Post subject: | Re: 1:72 USS Mitscher DL2 |
Gav, You are putting a lot of work into this ship, including the steam engine, and the materials you are using are relatively heavy. I was wondering if you have calculated the maximum weight to get it to float at the water line? I ask this because I have seen some builds that were beautiful models but total failures as R/C models because they could not be made to float correctly because of too much weight. You should be able to make a rough calculation of the volume of the hull below the waterline. Then multiply this volume by the weight of water - that is the absolute maximum weight you can have without the model floating too deep in the water. Figuring the maximum topside weight is trickier - involving the genter of gravity, righting moments, etc. But if you don't want it turning turtle and floating upside down (at least for a while before it sinks) it would be a good idea to work this out. Too heavy topside weight has doomed some models. **** As an aside, I know a fellow who is planning a 1:32 USS Missouri - about 28 feet (8.5 meters) long - built out of steel. He is currently designing the entire thing in SolidWorks, including a "floating drydock" trailer to haul it in. Phil |
Author: | Neptune [ Fri Dec 20, 2013 3:53 am ] |
Post subject: | Re: 1:72 USS Mitscher DL2 |
The easiest way to get a good figure on how heavy a model should be to float on the waterline is just divide the actual displacement of the real ship and divide it by the scale³ so in this case by 72 x 72 x 72 = 373248 since your scale is applied in 3 dimensions and that makes a volume. That is of course, if your hull shape is accurate. So for a 4271t ship that would be 4271 000 kg / 373248 = 11.44 kg, the 4271 t is standard displacement of mitcher according to wiki, I'm not an expert, so that might be wrong, but I'm sure you get the point. As Phil pointed out, the topside structure will be quite crucial when it comes to weight. Great job so far, it's not a very forgiving material to work with in such scales! I wouldn't want to have a collision with this model though ![]() |
Author: | badkeson [ Fri Dec 20, 2013 8:06 am ] |
Post subject: | Re: 1:72 USS Mitscher DL2 |
G'day Phil and Neptune, Yes, that thought had crossed my mind as well as visions of a brand new model destroyer imitating the Great Barrier Reef ![]() ![]() Either way, the adventure will certainly be enjoyable. The only other option would be to use a thinner plate like 1mm rather than the 1.6 for the frame that I have constructed so far. It is a lot more flexible and less forgiving in the welding process, but would reduce the weight by approximately 35%. I have the grand intent of using brass shim for the entire superstructure and what ever I can get my hands on for the fittings. Your thoughts on this gentlemen? At least once I have the skin on and do a float test, we can determine if the project will continue as an RC model, given away as a static model to a Returned Services League establishment or be scrap, except for the motor of course ![]() I eagerly await your input or scary maths. Regards, Gav |
Author: | badkeson [ Fri Jan 17, 2014 6:55 am ] |
Post subject: | Re: 1:72 USS Mitscher DL2 |
Hey all, Been working on the truing of the hull. A slow job that one, hope to have some pics next week. Also done a bit more on the motor... starting to look like one anyway, discovered there is a little bit of lathe work to do on the bearing blocks, the crank turns, but is a little tight, need to shave the faces on the bearing blocks ![]() Attachment: Now a slightly different view in my paw... Attachment: Attachment: Now I have gotten this far with the motor, I can build the engine mounts and weld them into the hull. Easier to do without the hull plates on. ![]() ![]() Will have to think about the gearbox really soon. One motor driving two screws... Boy, all this weight... grrrr, she is going to be heavy... at least I shouldn't need ballast ![]() Till next time, Be safe. |
Author: | russclark [ Thu Nov 13, 2014 7:31 pm ] |
Post subject: | Re: 1:72 USS Mitscher DL2 |
wow a model made from steel ,what an undertaking,and the engines truly amazing,great work ![]() |
Author: | Goodwood [ Thu Nov 13, 2014 7:44 pm ] |
Post subject: | Re: 1:72 USS Mitscher DL2 |
Blimey, yeah that would be a nasty surprise had you committed to a full steel hull! Still, good to see you back at it after such a long time! Maybe steel would still work for whichever battleship you decide to build (as long as it's HMS Nelson or Rodney)? |
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