Yes the arrow points to the volume that I am referring to which will increase untill the red bolt sail o-ring hits the green can. The problem is that it does not mater very much what you do because when the o-ring enters the can it will require force to compress the oring and slow the bolt down momentarily.
This might cause the ball to roll away from the bolt and the be caught up when the bolt accellerates on the second stage.
The NT11 has a smaller bolt sail ( I gues to decrease the force needed to compress but it also has lower operatin pressure which can cause problems with entering the can due to lower force). Recomendations from some techs was to use spacer in body and bolt to increase operating pressure which can overcome the dificulty of compressing the bolt sail o-ring when entering the can.
I did a test today with size 13 oring on bolt sail. This requires less force to compress and thus does not slow down as much when entering the can.
I used a NT10 with NT11 bolt and drilled blue insert ID 9mm. Dont know dwell or pressure but I will check that later. (also used DM eyepipe)
I shot high quality paint that break from 70-80cm height. No problems whatsoever...
The 13 oring might not last as long since it is streched more but seem to work good.
Originally Posted by d0cwh0
In terms of volume, is this the section you are referring to? Don't you have to consider the flow rates from the plunger into this area as well. From my understanding of the NT, it shifts a large amount of flow into this area. Wouldn't that cause the pressures rates to increase quickly leading to a fast acceleration on the initial forward stroke?
If you do have to consider the flow rates, can't you choke the flow so the pressure build rate is slower? Would this avoid the bolt acceleration issues by having a more even bolt speed?