I have recorded hundreds of recoil cycles (velocity and acceleration, as well as pellet exit), and the pellet exit has in every case been shortly after the completion of the compression stroke, during piston bounce. Available evidence suggests the pellet is in the region of 4" up the barrel at the end of the compression stroke.
Hello Jim in UK,Was this with a 12 FPE .177 break barrel? Thanks.
Mark,As Hector once explained to me, the most accurate guns are when the pellets is leaving the barrel at the same time that the piston comes to its initial stop from the forward motion.Supposedly, this keeps the harmonic vibrations of the barrel to a minimum until the pellet is out of the barrel. He called it "pellet dwell time".-Y
I've also read the peak pressure is reached before the pellet exits the barrel. Some guns have short barrels from the factory.Mendozas like my RM2800 have a barrel about 17 inches long but only the first 12 inches is rifled and it's bored out a little larger to the end.
I'm not having any issues with anything, this subject was brought up elsewhere and just thought I'd try to touch on the subject, my guns are not any harder to cock than with a full-length barrel, unless I put a monster spring in the power plant, the shot barrels I run are pretty common lengths in the U.K. HW's true K models have a 12.2'' barrel length, even with the HW80, I have also not had any velocity loss with the short barrels and accuracy is outstanding,
Does a pellet exit the barrel, before the piston hits home? or is the pellet still in the barrel when the piston hits home? for example, my HW's no longer have factory length barrels, let's compare a factory 16'' to a 12.2'' or a 10.5'' barrel length, starting with a 16'' barrel, has the pellet exited before or after the piston hits home
Quote from: Jim-in-UK on March 28, 2023, 05:39:16 AMI have recorded hundreds of recoil cycles (velocity and acceleration, as well as pellet exit), and the pellet exit has in every case been shortly after the completion of the compression stroke, during piston bounce. Available evidence suggests the pellet is in the region of 4" up the barrel at the end of the compression stroke.Curiosity has gotten the best of me. How do you determine all of this. It would seem to me that a lot of expensive, precision equipment to measure piston position relative to pellet postition in the barrel, and how does one determine at a specific time the position of a pellet in a barrel.I think all the experts and A/G makers and designers figure this stuff out and we read about it.
Curiosity has gotten the best of me. How do you determine all of this. It would seem to me that a lot of expensive, precision equipment to measure piston position relative to pellet postition in the barrel, and how does one determine at a specific time the position of a pellet in a barrel.