Search found 256 matches

by tonyc
Sun Sep 15, 2019 8:12 pm
Forum: General airgun chat
Topic: Fac vs 12lb
Replies: 10
Views: 136

Re: Fac vs 12lb

Maximum velocity while retaining accuracy is usually reckoned to be around 920-950fps. This puts maximum useful power levels at about 16-18ft lb in .177 and 32-36ft lb in .22 depending on pellet weight. I can't tell you from personal experience but, theoretically, you should be able to get about 20%...
by tonyc
Sun Sep 15, 2019 7:51 pm
Forum: General airgun chat
Topic: Removed the brass firing pot.
Replies: 15
Views: 416

Re: Removed the brass firing pot.

With no plenum there's more force on the valve from the cylinder so it closes a lot quicker enabling a quicker lock time. Yes, the valve will close quicker when the cylinder is full but not when it's running low, which is why the plenum is there to even out the air released at different cylinder pr...
by tonyc
Tue Sep 10, 2019 8:24 pm
Forum: General airgun chat
Topic: Removed the brass firing pot.
Replies: 15
Views: 416

Re: Removed the brass firing pot.

If you have two sets of data, one full string with the pot and one full string without the pot, post it. The only explanation I can come up with for no-pot setup as good as with-pot is if the pellet hasn't left the barrel before the firing valve closes and the pot vent hole is too large. That may be...
by tonyc
Tue Sep 10, 2019 11:14 am
Forum: General airgun chat
Topic: Removed the brass firing pot.
Replies: 15
Views: 416

Re: Removed the brass firing pot.

I think reducing or increasing the hole makes no difference at all. The pressure within the cylinder at full charge is immense and would easily fill the plenum volume instantaneously regardless of hole diameter. We're talking tons of pressure here at 190 bar.... Another factor to take into account ...
by tonyc
Sun Sep 08, 2019 8:16 am
Forum: Spring guns and tuning
Topic: Is is just me? (probably)
Replies: 8
Views: 235

Re: Is is just me? (probably)

Your thoughts on left arm placement are particularly interesting in that respect, though will presumably not work with kneeling/standing unsupported. Best when using a rest, which is why I like to use a small tripod from either kneeling position or seated on the ground. There are other positions wh...
by tonyc
Fri Sep 06, 2019 2:01 pm
Forum: TECHNICAL
Topic: Cocking bolt
Replies: 4
Views: 221

Re: Cocking bolt

I insert the mag as I pull the bolt back, so all done in one action. If you leave one chamber empty it's possible to pull back and close the bolt into the empty chamber without cocking the gun. That way I'm never leaving the gun cocked or a pellet in the chamber until I'm ready to take a shot. If yo...
by tonyc
Fri Sep 06, 2019 1:44 pm
Forum: Spring guns and tuning
Topic: Is is just me? (probably)
Replies: 8
Views: 235

Re: Is is just me? (probably)

Here are a few suggestions (anticipating that not everyone will agree). Try practicing with one position until you achieve reasonable consistency. Whatever position you start with, you want it to feel as comfortable and relaxed as possible. Using a rest might be a good start. My preference for long-...
by tonyc
Wed Sep 04, 2019 9:25 pm
Forum: Spring guns and tuning
Topic: Is is just me? (probably)
Replies: 8
Views: 235

Re: Is is just me? (probably)

As others, I suspect inconsistent hold and muscular tension are likely causes, and possibly inconsistent trigger finger so you are "pulling" shots. With practice you will sense that you've pulled a shot rather than the pellet being a flier. Another point to bear in mind is 5 shots is not really enou...
by tonyc
Fri Aug 30, 2019 10:42 pm
Forum: TECHNICAL
Topic: Galahad power tuning
Replies: 4
Views: 477

Re: Galahad power tuning

The regulator is the best way to boost it a little and always remembering to chrono so you're under 12 ft/lb. I have to disagree, unless the reg pressure is set much below optimum efficiency. If you increase the reg pressure and the on-reg power goes up the reg was set too low. If you increase the ...
by tonyc
Thu Aug 29, 2019 3:59 pm
Forum: Off topic chat
Topic: Moving to Facebook
Replies: 17
Views: 741

Re: Moving to Facebook

Not for me, I've given up on Facebook. I'm against the harvesting of personal data - very "Big Brother".