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Old 09-27-2020, 11:13 PM   #1
Masada   Masada is online now
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A self-adjusting cylinder head I designed...

So you know how nozzle to bucking engagement kind of matters? And how cylinder length, receiver length, nozzle length, and bucking design effect your air seal? Well I decided I'm going to try to fix all that. I originally was going to make some custom length cylinders for specific guns, but the costs involved were way too high and every gun would technically need a different cylinder length. Instead, I decided to try out a self-adjusting cylinder head.

Basically all this does is rest the base of the nozzle on the face of the hop-up chamber every time, regardless of where your cylinder actually ends. Therefore perfect nozzle and bb placement for every shot. Only downside currently is the internal length of the assembly. You lose about 0.5" of piston travel over a standard cylinder head.

As in normal for me, VSR platform and AA hop up chamber.

Also, not going to show the insides of this currently, sorry.

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Old 09-28-2020, 07:44 AM   #2
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That's strangely erotic.
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Old 09-28-2020, 08:11 AM   #3
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I’m guessing there’s a spring in there that keeps the nozzle forward? Not a bad design. If you Just run a shorter piston, the length won’t be that big of a deal!
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Old 09-28-2020, 11:38 AM   #4
Masada   Masada is online now
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Quote:
Originally Posted by Blind Sniper View Post
Iím guessing thereís a spring in there that keeps the nozzle forward? Not a bad design. If you Just run a shorter piston, the length wonít be that big of a deal!
Ya, it will stay as far forward as possible.
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Old 09-28-2020, 01:47 PM   #5
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Neat idea! Getting the right spring tension will be the trick. Too little and the actuating nozzle might get stuck. Too much and your bolt handle will not want to easily go down. I could see trying to make a quick follow up shot and not get the bolt pushed forward or bouncing back a little to where the handle wouldn't go down. Then in a panic, double cycling. You could combat this with a "v" style bolt handle-to-receiver design (I think careful maybe done this once) that engaged at the furthest point when nozzle was fully extended and as the handle went down, it pushed bolt forward into position). The other thought is if you had the real-estate, use neo-mag to pull nozzle into hopup unit (although this may require a hopup unit modification).
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Old 09-28-2020, 02:46 PM   #6
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Originally Posted by Jbrinker1 View Post
Neat idea! Getting the right spring tension will be the trick. Too little and the actuating nozzle might get stuck. Too much and your bolt handle will not want to easily go down. I could see trying to make a quick follow up shot and not get the bolt pushed forward or bouncing back a little to where the handle wouldn't go down. Then in a panic, double cycling. You could combat this with a "v" style bolt handle-to-receiver design (I think careful maybe done this once) that engaged at the furthest point when nozzle was fully extended and as the handle went down, it pushed bolt forward into position). The other thought is if you had the real-estate, use neo-mag to pull nozzle into hopup unit (although this may require a hopup unit modification).
Ya it's gonna be interesting with the spring tension and seal friction. I'm hoping it works out fine, but I'll have to wait until parts show up to see.

The bolt push is going to be interesting too.

A magnet on the hopup chamber is a neat idea, but I'm not sure I want to mess with that part. I'd like to stick with using a standard AA chamber.
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Old 09-29-2020, 05:35 AM   #7
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Wouldn't it be easier just to make an air nozzle that can screw out to different lengths?
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Old 09-29-2020, 08:06 AM   #8
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You’d have to manually adjust it and use whatever method to tighten whether it be a nut or just exchangeable tips. I think he’s aiming for “hands free”. If everything works as planned you won’t have to worry about changing or adjusting!!
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Old 09-29-2020, 11:46 AM   #9
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Ya, it's possible and I already have a different cylinder head design with exchangeable nozzles. This one is more about being flexible and easily usable with many part combinations, especially without spending a bunch of time tuning for each setup. I'm hoping this just works without issue in whatever setup I drop it in.
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Old 09-30-2020, 07:07 PM   #10
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Following this closely. Very interesting
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Old 11-03-2020, 12:54 AM   #11
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Well, if I hadn't messed up on one of my drawings this would be installed in my gun. Apart from my screwup, the design works really awesome. I was worried about the spring not being strong enough to keep the nozzle fully extended, but it ended up working just fine. Plus, the nozzle tip design seals super well with the bucking. No more leakage here.

I was kinda hoping to have this installed and working for Starburst this weekend, but it doesn't look like that's going to happen due to my mistake.

https://youtu.be/fel-dRu3Qts
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Old 11-03-2020, 06:26 AM   #12
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That looks pretty awesome. Any chance you’ll sell some (especially if it ends up including adjustable/exchangeable nozzle lengths)? I’d love to have one that fits EdGi cylinders.
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Old 11-03-2020, 10:04 AM   #13
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I hadn't really planned on doing different nozzle lengths for this design, though it is technically possible. I just don't know if it's necessary with this setup since it's always as far forward as possible and (what I think is) a very good overall length.

I also have a more traditional cylinder head design that has interchangeable nozzles. I think it would fit Edgi cylinders, though that's one of the few I haven't tried. Let me know if you want to try that one out.
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Old 11-03-2020, 10:45 AM   #14
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I want one really badly lol, think I'll have to make my own, possibly even better, but we'll see😂
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Old 11-03-2020, 07:25 PM   #15
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Quote:
Originally Posted by Masada View Post
I hadn't really planned on doing different nozzle lengths for this design, though it is technically possible. I just don't know if it's necessary with this setup since it's always as far forward as possible and (what I think is) a very good overall length.

I might be wrong here but I feel like adjustable nozzle lengths and the self-adjusting mechanism have the ability to solve separate problems.


One thing I don't like about the VSR and other bolt action systems is that the cylinder is held forward by the bolt handle. Personally, my cylinder wobbles a hair when forward because of that single-point of retention.


I don't think a better fitting bolt handle is the answer. Not only would it make it much more difficult to actuate the bolt handle, but it would put additional wear on the receiver - which would end up introducing the same wobble again.


The self adjusting cylinder head seems like a great way to deal with that wobble. It'd make sure that the nozzle mates with the bucking the same way regardless of the small cylinder wobble.


Having an adjustable nozzle length beyond that would allow people to tune how deep their nozzle engages their specific bucking and hop-up unit, which is something that can be finely tuned. Even something as simple of bridgeless vs bridged barrels could effect how deep you want the BB to be held.


Either way I'd be happy to try anything with an EdGi cylinder.
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