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  #21  
Old 10-06-2018, 06:52 PM
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Vinalssergio155 Vinalssergio155 is offline
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Thank you very much Elliott. I think I've already commented, in these months that I've been in the forum, and in another Spanish-speaking one, the quality of my constructions improved incredibly, what you learn seeing such amazing works from so many talented kids is fantastic. And the tips, methods and tricks that are shared are the best school there is. With all this you can not do anything but improve your skill. I am very grateful to all.
I commented to the boys of Wot the inconvenience with the instructions. During the test the constructor had the same problem as Charlie and I. This is detailed in the text, of course, it is in Russian. So you have to take some time and translate the text.
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  #22  
Old 10-06-2018, 07:29 PM
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CharlieC CharlieC is offline
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The guy from WoT is quite right - the issue with Part #62 is in the instructions. But - the .pdf is locked so unless you can read Russian you would never know.
Attached is an OCR/Translation of the text of the instructions.

Regards,

Charlie
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File Type: pdf S-51_Instructions.pdf (28.7 KB, 18 views)
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  #23  
Old 10-07-2018, 03:32 AM
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AgaPablo AgaPablo is offline
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Great work on the tracks, and also very good surgery with the gun emplacement!
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  #24  
Old 10-07-2018, 03:00 PM
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Vinalssergio155 Vinalssergio155 is offline
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Thank you very much for the text translated Charlie, translate from English to Spanish is more reliable.
Pablo, thank you very much!
After solving the problem with the well we advance with a few details Nothing very difficult, just many small pieces, edges to paint and care locate them. The S-51 is taking a nice shape, in a while I start the howitzer and I hope for a good result. Thank you very much.
Attached Thumbnails
S-51 experimental, WoT design, in 1/50-20181005_122811.jpg   S-51 experimental, WoT design, in 1/50-20181005_204202.jpg   S-51 experimental, WoT design, in 1/50-20181005_204908.jpg   S-51 experimental, WoT design, in 1/50-20181005_205647.jpg   S-51 experimental, WoT design, in 1/50-20181005_210457.jpg  

S-51 experimental, WoT design, in 1/50-20181006_170346.jpg   S-51 experimental, WoT design, in 1/50-20181006_170410.jpg   S-51 experimental, WoT design, in 1/50-20181006_170421.jpg   S-51 experimental, WoT design, in 1/50-20181007_084151.jpg   S-51 experimental, WoT design, in 1/50-20181007_172456.jpg  

S-51 experimental, WoT design, in 1/50-20181007_172507.jpg   S-51 experimental, WoT design, in 1/50-20181007_172524.jpg   S-51 experimental, WoT design, in 1/50-20181007_172537.jpg   S-51 experimental, WoT design, in 1/50-20181007_172605.jpg  
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  #25  
Old 10-09-2018, 09:15 AM
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Vinalssergio155 Vinalssergio155 is offline
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Saludos.Montamos the howitzer in its support.Construir these tubes was fun and really was not difficult, just take it easy, shape and try to focus as well as possible.
The 3 rolls, I do not know what they are called or what function they fulfill, for me they are simple to close, I use paper of 75grs, I give it shape with a stick of brochete, and then I am closing more, once well closed the first round only remains firm roll and apply glue at the end.
Length of the canyon can be the most delicate, measure 7cm and close it once at least I can not, I do it by sections, I apply glue, hold a while, and so on until the end.
Attached Thumbnails
S-51 experimental, WoT design, in 1/50-20181007_193941.jpg   S-51 experimental, WoT design, in 1/50-20181008_124609.jpg   S-51 experimental, WoT design, in 1/50-20181008_214845.jpg   S-51 experimental, WoT design, in 1/50-20181008_214858.jpg   S-51 experimental, WoT design, in 1/50-20181008_214927.jpg  

S-51 experimental, WoT design, in 1/50-20181008_215021.jpg   S-51 experimental, WoT design, in 1/50-20181008_221807.jpg   S-51 experimental, WoT design, in 1/50-20181009_061321.jpg   S-51 experimental, WoT design, in 1/50-20181009_061331.jpg   S-51 experimental, WoT design, in 1/50-20181009_061350.jpg  

S-51 experimental, WoT design, in 1/50-20181009_061355.jpg   S-51 experimental, WoT design, in 1/50-20181009_061425.jpg  
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  #26  
Old 10-09-2018, 09:21 AM
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Vinalssergio155 Vinalssergio155 is offline
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And so it remains in place. Some pieces to complete the entire helmet before starting work with wire.
Attached Thumbnails
S-51 experimental, WoT design, in 1/50-20181009_062459.jpg   S-51 experimental, WoT design, in 1/50-20181009_062514.jpg   S-51 experimental, WoT design, in 1/50-20181009_062532.jpg   S-51 experimental, WoT design, in 1/50-20181009_062555.jpg   S-51 experimental, WoT design, in 1/50-20181009_062625.jpg  

S-51 experimental, WoT design, in 1/50-20181009_062710.jpg   S-51 experimental, WoT design, in 1/50-20181009_062720.jpg   S-51 experimental, WoT design, in 1/50-20181009_062731.jpg   S-51 experimental, WoT design, in 1/50-20181009_062750.jpg  
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  #27  
Old 10-09-2018, 11:11 AM
rifleman rifleman is offline
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very nice build well done
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  #28  
Old 10-09-2018, 03:57 PM
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CharlieC CharlieC is offline
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Quote:
Originally Posted by Vinalssergio155 View Post
... The 3 rolls, I do not know what they are called or what function they fulfill, for me they are simple to close,...
It isn't obvious how this howitzer works. It's designed the same way as a naval gun - the barrel slides inside a cradle and the breech is attached to the cradle by the hydraulic recoil cylinder and the pneumatic recuperator cylinder(s). (The rectangular blocks on the barrel in front of the cradle are to stop excessive recoil distance.) I think on this howitzer the recuperator (returns the barrel to the firing position) is the cylinder on top of the howitzer and the recoil cylinder is below the cradle. It looks like the upper two cylinders underneath the cradle are a reservoir - probably for hydraulic fluid. In large and powerful guns the hydraulic fluid in the recoil cylinder can overheat very quickly so it's usual to have reservoir of fluid.

The images of a real B-4 howitzer at St Petersburg show the cylinders underneath the cradle and the attachment of the recoil and recuperator cylinders to the breech.

Regards,

Charlie
Attached Thumbnails
S-51 experimental, WoT design, in 1/50-b-4_howitzer_recoil_assembly.jpg   S-51 experimental, WoT design, in 1/50-b-4_howitzer_breech.jpg  
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  #29  
Old 10-09-2018, 06:48 PM
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Vinalssergio155 Vinalssergio155 is offline
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rifleman, thank you very much.
Charlie, I do not know how to thank so much valuable information that constantly provides. Now I have an idea of ​​how this worked. I suppose the force and pressure exerted by this thing in each shot must have been extraordinary. Thank you very much for the information and photos.
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  #30  
Old 10-09-2018, 10:26 PM
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CharlieC CharlieC is offline
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I found some results of a B-4 firing test in the 1930s. It doesn't look like a shot at full power but the recorded breech pressure was 2070 kg/sq. cm.
You can work out the energy the recoil system absorbs from the Kinetic Energy of the projectile when it leaves the muzzle - projectile 100kg, muzzle velocity 600 m/sec. There are videos of B-4 howitzers firing and the carriage doesn't seem to move so all of the recoil energy is absorbed by the hydraulic recoil cylinder.

Regards,

Charlie
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