Quote:
Originally Posted by pestobanana
I'm doing 550mm fine with a full cylinder and sorbo pad, without a sorbo you could probably push to maybe 600mm. I think that depends a lot on the piston head/cylinder combination, because how quickly the o-ring makes the seal will make a big difference here.
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I'm not saying you're wrong. It's very possible that the standard bore full cylinder is good to... I don't know, 570mm or whatever. Just pulling that number out of my head. Your statement reiterates my point. Your full cylinder setup is still good up to 550mm.
We just don't know exactly "where" between 550mm and 590mm the widebore cylinder is required, as there really aren't any available out there on the mass market.
Unless we test it at 1mm increments at every barrel bore, it's hard to determine the exact graph where the switchover is need to be made.
But my point still stands, at some point, above 550mm length, the switch needs to be made to a widebore cylinder. As well, this could be offset by tightening the barrel bore further to reduce the required air volume to get the projectile out of the barrel.
I once did a 6.04mm 590mm setup with a standard bore full length cylinder, with a Systema M120S spring, and it was hitting just under 400fps.
On full auto, it got as low as 360fps, so there's some barrel suck happening.
Once I installed a wide bore cylinder, I hit just over 420fps, which is what the M120S should be hitting. That velocity was maintained in full auto fire. This is where my assumption is made that widebore cylinders are required for barrels above 550mm.