What's your RECommended REGulator setpoint for the following scenario? 😊

Jump to latest Follow Reply
JungleShooter

JungleShooter

Member
Sep 5, 2018
3,634
1,712
Lima (11,000,000 people + twice as many pigeons)
What's your RECommended REGulator setpoint for the following scenario?

I'm still trying to understand regulated PCP tuning.
(And yes, I did read a lot of Bob Sterne's excellent instructionals! 👍🏼👍🏼)

Would you help me out? 😊 
▪Gun = Skyhawk .22 

▪Pellet = Baracuda 21.14gr

▪HST Tune = I followed Bob Sterne's instructions to set the HST so that the MV mentioned in both scenarios are 5% below the "knee" 





🔶 Scenario A:

Regulator Setpoint A = 130bar

Muzzle Velocity = 804fps

Muzzle Energy = 30.3FPE





🔶 Scenario B:

Regulator Setpoint A = 150bar

Muzzle Velocity = 821fps

Muzzle Energy = 31.6FPE



🔶 Question 1: 
Even though I upped the regulator a full 20 bar, I only gained around 1 foot-pound of energy...! 😟
▪Why so little gain?!? 
▪Is this the issue again because the hammer spring isn't strong enough? 
▪Or is this the other perennial issue of a plenum that is too small? 



🔶 Question 2:
▪Am I loosing a lot of shots by being at 150bar instead of 130bar? 

▪Or is the shot count pretty much the same in both scenarios — 

because in the 150bar scenario I'm using a higher pressure in the plenum — 

and the higher pressure pushes the air (and the pellet) quicker — 

so therefore less air is needed to produce the same muzzle energy?
Right? Wrong? 😊 



Thanks for your help. 

Matthias
 
What's your RECommended REGulator setpoint for the following scenario?

I'm still trying to understand regulated PCP tuning.
(And yes, I did read a lot of Bob Sterne's excellent instructionals! 👍🏼👍🏼)

Would you help me out? 😊 
▪Gun = Skyhawk .22 

▪Pellet = Baracuda 21.14gr

▪HST Tune = I followed Bob Sterne's instructions to set the HST so that the MV mentioned in both scenarios are 5% below the "knee" 





🔶 Scenario A:

Regulator Setpoint A = 130bar

Muzzle Velocity = 804fps

Muzzle Energy = 30.3FPE





🔶 Scenario B:

Regulator Setpoint A = 150bar

Muzzle Velocity = 821fps

Muzzle Energy = 31.6FPE



🔶 Question 1: 
Even though I upped the regulator a full 20 bar, I only gained around 1 foot-pound of energy...! 😟
▪Why so little gain?!? 
▪Is this the issue again because the hammer spring isn't strong enough? 
▪Or is this the other perennial issue of a plenum that is too small? 



🔶 Question 2:
▪Am I loosing a lot of shots by being at 150bar instead of 130bar? 

▪Or is the shot count pretty much the same in both scenarios — 

because in the 150bar scenario I'm using a higher pressure in the plenum — 

and the higher pressure pushes the air (and the pellet) quicker — 

so therefore less air is needed to produce the same muzzle energy?
Right? Wrong? 😊 

Thanks for your help. 

Matthias
Click to expand...

Regarding question # 2

How many shots are you getting per fill at each of the regulator settings?

I'll follow & listen& learn
 
Upvote 0
I think you're pretty much going to have to run a shot count to determine. Barrel length, valve design as well as plenum volume all play into the amount of shots you will get. For instance a gun with a shorter barrel will get more "total' shots", which will likely show a lower ES based on the fact that it would be near impossible to tune it at the knee with a really high reg setting.

Just run an abbreviated string and then use a calculator to estimate the efficiency of each. As long as you stay above the reg pressure when testing this will give a pretty good estimation. Of course the long string you do the more accurate the estimate will be.
 
Upvote 0
How many shots are you getting per fill at each of the regulator settings?
Click to expand...



SilentSquirrel*,

that's exactly what I was hoping to avoid having to find out by way of 100 pellets and 300 pump strokes...! 😄 





*What a harmless-sounding name for a hunter, great choice for a user name! 😄👍🏼 



Click to expand...

Not so harmless when you consider me a squirrel seeking revenge on those who want to shoot me just because I like to eat the fruit from their trees

ssh!

Be vewy, vewy , qwiet about that pwease

I have a pwan
 
Upvote 0
I'm no expert, have played with reg settings in a couple of rifles. There are so many variables involved, it almost defies simple rules. The rifle I spent the most time on is an FX Royale 400 in which I installed a Huma reg. Without a reg tester, I had the rifle apart probably 20 times. I finally found reg and HS settings that gave me my target velocity, and allowed some up and down HS adjustments. The "knee" is, to me, just a body part, although I know it is a valid tuning technique. Basically, I found it to be a challenge of balancing reg setting with HS tension, at a point that allows some movement up and down. If more HS tension yields no more velocity, you probably need a higher set point on the reg. This assumes, of course, that your goal is feasible with the rifle/reg/spring combination. If your expertise is as basic as mine, find a pro. Or, if you have a lot of time and patience, have fun. 
 
Upvote 0
You must log in or register to reply here.
Top Bottom
Back
Home
Forums
Resources
Menu