The Ship Model Forum

The Ship Modelers Source
It is currently Sat Sep 26, 2020 1:11 am

All times are UTC - 6 hours [ DST ]




Post new topic Reply to topic  [ 43 posts ]  Go to page Previous  1, 2, 3
Author Message
PostPosted: Thu Aug 27, 2020 11:37 am 
Offline

Joined: Thu Apr 28, 2005 8:46 pm
Posts: 196
Attachment:
recoil -- max piston travel.jpg
recoil -- max piston travel.jpg [ 95.22 KiB | Viewed 61 times ]

With the brake cylinder mounted, it is now possible to make some basic measurments of the maximum possible travel associated with a recoil. The travel is limited absolutely by the distance that can be moved by the piston inside the shock absorber.

This turned out to be 80 mm, as shown. Not sure this is a realistic value and would welcome comment. It implies that in a single cycle, the piston (actually the cylinder) traverses about 6 inches altogether through the glycerine fluid -- 3 inches aft and then 3 inches forward.
Attachment:
recoil slides aft & brake cylinder.jpg
recoil slides aft & brake cylinder.jpg [ 236.16 KiB | Viewed 61 times ]

Shown from below at the full extent of a recoil. The slides, their mounting ring, the gun tube and the brake cylinder all shift aft as an integral unit with the recoil. Note the slides protruding aft from the guides. Inside the brake cylinder can be seen a fixed disk and retainer that provide the base for the internal springs. The cylinder freely slides past this disk as the gun recoils.


Report this post
Top
 Profile  
Reply with quote  
PostPosted: Thu Aug 27, 2020 12:42 pm 
Offline
User avatar

Joined: Wed Sep 28, 2011 12:04 pm
Posts: 1095
Location: Paris
If the 80 mm is what you measured, then this is likely to be true. I have never seen any such gun been fired, but have been surprised to see in drawing over how short distance the recoil was stopped. I think we are often mislead by cinema films, where guns either don’t show any recoil or jump madly. I think on youtube you can see some late 19th/early 20th century guns being fired.

A major concern would be the heat dissipation from the recoil brake. The glycerine would heat up fast after a few shots, the kinetic energie being converted into heat. In some guns this seems to have limited the rate of fire, rather than the level of training of the gun crew.

_________________
wefalck

Chairman Arbeitskreis historischer Schiffbau e.V. (German Association for Shipbuilding History)

--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Image Image Image Image


Last edited by wefalck on Sat Aug 29, 2020 3:32 am, edited 1 time in total.

Report this post
Top
 Profile  
Reply with quote  
PostPosted: Fri Aug 28, 2020 8:47 pm 
Offline

Joined: Thu Apr 28, 2005 8:46 pm
Posts: 196
Many thanks wefalck. I will assume the displacement of the barrel is a reasonable approximation and proceed to the next step — probably the pintel.

Keen observation about the exaggerated recoils depicted in movies. Michael


Report this post
Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 43 posts ]  Go to page Previous  1, 2, 3

All times are UTC - 6 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 2 guests


You can post new topics in this forum
You can reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
Powered by phpBB® Forum Software © phpBB Group