Topic: Five Easy Probes

[WyoMan]

That was a cool idea with the probeless setup....maybe an original 
What I find interesting about the physics part is that improving the flow more than trumps the offsetting loss in parasitic transfer volume..
which is the dead space that the pressurized air fills in between the valve and pellet......so,
a really hollowed out flow thru is a good bet in 22 cal....thanks again Carl 

[Brent]

That was a cool idea with the probeless setup....maybe an original 
What I find interesting about the physics part is that improving the flow more than trumps the offsetting loss in parasitic transfer volume..
which is the dead space that the pressurized air fills in between the valve and pellet......so,
a really hollowed out flow thru is a good bet in 22 cal....thanks again Carl 

Wyo... you understand this more than I - so would you think a hollow probe with really thin sides walls, but the smaller inside diameter thus still... versus an extended probe with a really small diameter wire, but in that possibly causing turbulence in the air (co2) as the air tries to move around it still - is better?

I am not sure there is a right or wrong answer here guys 
But Carl has gotten us this far... so let's see if we talk it out, just maybe we will all together figure out the ultimate bolt once and for all... if there is one 

[1377x]

Wyo... you understand this more than I - so would you think a hollow probe with really thin sides walls, but the smaller inside diameter thus still... versus an extended probe with a really small diameter wire, but in that possibly causing turbulence in the air (co2) as the air tries to move around it still - is better?

I am not sure there is a right or wrong answer here guys 
But Carl has gotten us this far... so let's see if we talk it out, just maybe we will all together figure out the ultimate bolt once and for all... if there is one 

airforce guns use the ultimate set up
the air come from directly behind the pellet.no turns bends loop d loops

[DaveB50]

Thanks for doing this Carl, great review of bolt designs. How long before someone makes a bolt with a retractable probe? A bolt within a bolt?
Dave

[AgentWD40_FL]

Nicely done Carl. 

[WyoMan]

Wyo... you understand this more than I - so would you think a hollow probe with really thin sides walls, but the smaller inside diameter thus still... versus an extended probe with a really small diameter wire, but in that possibly causing turbulence in the air (co2) as the air tries to move around it still - is better?

I am not sure there is a right or wrong answer here guys 
But Carl has gotten us this far... so let's see if we talk it out, just maybe we will all together figure out the ultimate bolt once and for all... if there is one 

Not sure which (flow thru or extended probe) can provide better flow, you maybe right about turbulence  with the probeless giving
the best results......tells me the gas likes flow.....

[arkmaker †]

I am so not sure in asking this... for discussion by those that know better than me - but if we used something small in diameter to push the pellet in past the transfer port... does the lead in of the barrel up into the rifling... allow for the pellet to become, and/ or load not square at that point?

Yes, the lead in helps no doubt, but think of the head of the pellet. Ya know how when you put a pellet in the breech and it tilts down nose first and then gets hung up in the stupid screw counter-bore. Well using the  hollow tip probe seems to help that a bit and should keep the pellet held in place all the way to its final resting place.
My theory is that if using just a straight tipped probe the pellet could be pushed into the barrel tilted all the way to its final resting place, distorting the skirt.


Now, does that actually happen? Who knows for sure. I would like to make a plexiglass barrel and see for sure.
Anyway, there is my twisted train of thought.
Rich

[cheewee]

Thanks for doing this Carl, great review of bolt designs. How long before someone makes a bolt with a retractable probe? A bolt within a bolt?
Dave

i actually looked into this but after testing on a probeless bolt i had very eratic fps readings and decided against it. maybe time to rethink it.

[cheewee]

Thanks for doing this Carl, great review of bolt designs. How long before someone makes a bolt with a retractable probe? A bolt within a bolt?
Dave

actually thought about doing this but after testing on a probless bolt decided against it because of very eratic fps reading

[ettolo]

Thanks for doing this Carl, great review of bolt designs. How long before someone makes a bolt with a retractable probe? A bolt within a bolt?
Dave

i figured the same thing! 

[arkmaker †]

Something spring loaded, so that the probe would retract automatically when you lock the bolt and extend when unlocked!


Not asking for much, am I?

[Cross Pistol Packer]

Nice work

[dptrucker32chip]

Good job  Carl .    Good information  !!!  Thank  u ,for all ur hard work .

[quickster47 †]

How long before someone makes a bolt with a retractable probe? A bolt within a bolt?
Dave

This is what I have been contemplating since I finished the testing.  It would definitely be a design challenge but there are lots of us out there that like a good challenge.

Carl

[crossliner]

Kind of like a telescopic probe but that is too much hard work on too small a part. Then there is the issue of air going to waste. Or it can be done the syringe way. You know a long thin rigid shaft (w/ some kind of a stopper) that impales the breech plug as well the bolt..Kind of like a mini power adjuster