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 Post subject: LP53 k 495fps
PostPosted: Mon Oct 23, 2017 10:32 am 
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Joined: Wed Dec 05, 2012 6:52 pm
Posts: 79
Introducing my 53k special ...495 fps ..vibration free and reduced recoil....a great ratting tool for my pocket or tackie box.... accuracy is 20mm at 10 yards ...


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 Post subject: Re: LP53 k 495fps
PostPosted: Mon Oct 23, 2017 10:39 am 
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Joined: Fri Sep 23, 2005 2:29 pm
Posts: 6205
Location: Okanagan,BC
Isn't that stock about 400 fps?

How did you get it to shoot at closer to 495 fps?

8)


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 Post subject: Re: LP53 k 495fps
PostPosted: Mon Oct 23, 2017 10:47 am 
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Joined: Wed Dec 05, 2012 6:52 pm
Posts: 79
Stock, they run 400 to 425 fps but on the twin mainsprings which are a bad idea really.
Using a HW30 spring shortened to 18 coils....flattened end and re polished ends....then machining up nice snug fitting Delrin guides ..returned 465 fps...
Finally chucking out the inconsistant leather piston seal for the TR Robb PTFE head but i modified this slightly to give a little more stroke and feather edged it ...
Taking it on into 500 fps territory with a piston weight ....actually quite a bit above but i scaled it back to 495 fps by removing the weight....for the reduced recoil......its smooth..vibration free and virtually silent..
These Walthers have near perfect piston stroke/volume/transfer port parameters ....ruined by the twin mainspring set up...


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 Post subject: Re: LP53 k 495fps
PostPosted: Mon Oct 23, 2017 10:50 am 
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Joined: Wed Dec 05, 2012 6:52 pm
Posts: 79
Delrin guide and slip ring


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 Post subject: Re: LP53 k 495fps
PostPosted: Mon Oct 23, 2017 10:51 am 
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Joined: Fri Sep 23, 2005 2:29 pm
Posts: 6205
Location: Okanagan,BC
Quote:
its smooth..vibration free and virtually silent..


Nice!

:)


Last edited by wllm995 on Mon Oct 23, 2017 10:53 am, edited 1 time in total.

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 Post subject: Re: LP53 k 495fps
PostPosted: Mon Oct 23, 2017 10:52 am 
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Joined: Wed Dec 05, 2012 6:52 pm
Posts: 79
Thank you buddy ....if you need more info let me know ...ive been tuning them for 10 years now but this Kurtz version my first


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 Post subject: Re: LP53 k 495fps
PostPosted: Mon Oct 23, 2017 10:54 am 
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Joined: Wed Dec 05, 2012 6:52 pm
Posts: 79
A friends full length version ....497 fps
Plus the group i shot at 8 yds ....


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 Post subject: Re: LP53 k 495fps
PostPosted: Mon Oct 23, 2017 11:00 am 
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Joined: Wed Dec 05, 2012 6:52 pm
Posts: 79
Piston and internals were taken to a high polish ....


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 Post subject: Re: LP53 k 495fps
PostPosted: Mon Oct 23, 2017 11:18 am 
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Joined: Wed Dec 05, 2012 6:52 pm
Posts: 79
....development components returning various performance effects...
Its been fun.


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 Post subject: Re: LP53 k 495fps
PostPosted: Mon Oct 23, 2017 1:51 pm 
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Joined: Sun Mar 24, 2013 1:56 pm
Posts: 225
Location: Lebanon, CT
Well done! and now you've got an enviable shooter. Nice. RC


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 Post subject: Re: LP53 k 495fps
PostPosted: Mon Oct 23, 2017 10:24 pm 
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Joined: Sat Mar 16, 2013 5:15 am
Posts: 3593
Location: Edmonton
Very cool. Thanks for posting.


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