Pistol Crossbow - Cobra 80 lb assembly and test, page 2
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ATS Members have flagged this thread 4 times


reply posted on 1-2-2009 @ 07:48 PM by Bob Sholtz
reply to post by Anonymous ATS




You might end up shooting your hand, if the bolt jumps track. Accuracy would be way down also, and it would probably destroy the bolt if you hit anything that gives resistance.


reply posted on 18-2-2009 @ 08:49 PM by citizen smith
reply to post by Mintwithahole.



Its more to do with the mass of the bolt rather than length that needs to be matched to the xbow. Too light a projectile, and as you say, is the equivalent of a 'dryfire'

Incidentally, I've seen quite a few models of xbow that have a tube/rail mounted above the bolt-tracks enabling far shorter bolts (5cm) to be launched without danger of it skipping wildly off the track


reply posted on 25-3-2009 @ 09:16 AM by Mintwithahole.
Originally posted by citizen smith
reply to
post by Mintwithahole.



Its more to do with the mass of the bolt rather than length that needs to be matched to the xbow. Too light a projectile, and as you say, is the equivalent of a 'dryfire'


I've often wondered about that. Some of the bolts which I have seen, especially the unbendable carbon ones, are usually listed as not being suitable for ordinary compound crossbows only the recurves.


Incidentally, I've seen quite a few models of xbow that have a tube/rail mounted above the bolt-tracks enabling far shorter bolts (5cm) to be launched without danger of it skipping wildly off the track

That would make the front of the crossbow look almost like a rifle barrel wouldn't it? I've never seen one like that before.


reply posted on 27-3-2009 @ 06:16 AM by citizen smith
reply to post by Northern Raider



Check out the pic of the test results I posted up in the 'Crossbows- What's Best' thread..

The block of stone-ware pottery clay used for the first test has a very similar consistency to flesh (minus bones and cartilidge)...even when wrapped in a few layers of scrap clothing to mimic outer&inner shell garments the bolts still tear through

A trip to the butchers for a beef shin bone to clag up with clay is needed to further the tests, either that, or the sunday roast is going to look a bit like a swiss cheese this week

[edit on 27-3-2009 by citizen smith]



reply posted on 27-3-2009 @ 07:03 AM by Northern Raider
Originally posted by citizen smith
reply to
post by Northern Raider



Check out the pic of the test results I posted up in the 'Crossbows- What's Best' thread..

The block of stone-ware pottery clay used for the first test has a very similar consistency to flesh (minus bones and cartilidge)...even when wrapped in a few layers of scrap clothing to mimic outer&inner shell garments the bolts still tear through

A trip to the butchers for a beef shin bone to clag up with clay is needed to further the tests, either that, or the sunday roast is going to look a bit like a swiss cheese this week

[edit on 27-3-2009 by citizen smith]

Thanks Smithy, I'll have a look see, my terrible gut feeling about social unrest is not declining so i'm having a major sort out of my kit.

BTW I think I will probably sell my recurve bow set up if anyone in interested. 30lb draw at 30 inches, twenty plus brand new arrows, belt quiver , spare strings , sights etc £150 if interested.


reply posted on 31-3-2009 @ 09:05 AM by citizen smith
reply to post by Northern Raider



I've started noticing a fair amount of string wear after putting some 50-60 shots through mine.

I'm not sure if the current break-actions are a carbon-copy af the original Barnett model you have NR, but the gold anodised 'guide plates' that attach to either side of the flight-track on the Armex models seem to sit a mil or so proud above the upper surface of the track, and seem to be slowly cutting through the string sleeving at that point...time for the Dremel methinks!

Perhaps an additional wrap-layer of PTFE plumbing-thread tape would help with that problem.

The graphite coating using a soft B-grade pencil seems to work wonders when applied all over the bolt shaft...really decreases the drag as the bolt body penetrates the target, particularly if its a dense material


reply posted on 31-3-2009 @ 10:32 AM by Northern Raider
Originally posted by citizen smith
reply to
post by Northern Raider



I've started noticing a fair amount of string wear after putting some 50-60 shots through mine.

I'm not sure if the current break-actions are a carbon-copy af the original Barnett model you have NR, but the gold anodised 'guide plates' that attach to either side of the flight-track on the Armex models seem to sit a mil or so proud above the upper surface of the track, and seem to be slowly cutting through the string sleeving at that point...time for the Dremel methinks!

Perhaps an additional wrap-layer of PTFE plumbing-thread tape would help with that problem.

The graphite coating using a soft B-grade pencil seems to work wonders when applied all over the bolt shaft...really decreases the drag as the bolt body penetrates the target, particularly if its a dense material


Heck I have fired over 200 bolts with this string and the nylon cover over the centre of the string is just starting to crack, I think we need to try a few layers of heat shrink tubing like archers use. ? What do you think ?
NR


reply posted on 31-3-2009 @ 10:41 AM by Mintwithahole.
reply to post by Northern Raider





Heck I have fired over 200 bolts with this string and the nylon cover over the centre of the string is just starting to crack, I think we need to try a few layers of heat shrink tubing like archers use. ? What do you think ?


You could always buy some Eastman flight rail lube which you run up and down the runners either side of the rail to reduce friction on the string. Or, you could do what I did for a wihle and simply use a little tin of releasing oil! I've seen some survivalist sites which say that butter or lard work just as well in a SHTF situation.
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