A Hummingbird tuning ?
With regard to the Hammer spring working with the regulator, in theory (at least) is it possible to both reduce power and per-shot air usage so as to make less power and extend the shot count? Also how does one remove the hammer spring (to clip a coil)? Is it an outright simple thing to do?
thanks
Darryl
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Viewing 13 replies - 1 through 13 (of 13 total)
Sure you can but with Mr. Rowe’s method there is noting permanent.
I can just quickly make a day light savings adjustment back an hour to noon again. 
~ GKU
My experience with cutting hammer springs was always pretty good: flatter shot string and lower Es; lower air consumption. :winkn:
Darryl
Did you try to adjust the reg and hammer spring to lower your speed ?
To increases efficiency I would think it’s the valve spring that’s needs tuning to achieve an increase shot count ?
All in all a balance with all three springs.
Just my two pennies.
~ GKU
p.s. maybe in the need of an “Ernest tune”. :8:
That is way SMART Ernest !
I have a Compact .177 cal that came sending JSB 10.3 gr @ 920ish.
HST at all the way out ccw now it’s @ 890ish, I’m thinking of doing your above method to it to dial it down a bit.
Making the HST at about half way in so I will have some play in both direction.
~ GKU
Rotate the barrel? Very interesting idea. Have to remember to try that. Once I get a couple of issues resolved I’ll see what this Bird can be trained to do. 😉 Thanks Ernest. How did the low FPS effect your shot count?
darryl
if you want to keep the reg and hst in sink, just rotate the barrel to reduce the transfer port hole to the speed you want, it will have a consistent ES then lowering the reg pressure and tuning the HST. that’s what I done to mine down to 10fpe and vary accurate with JSB 13.4g. vary quiet for back yard plinking and pest control.
Did you try to adjust the reg and hammer spring to lower your speed ?
To increases efficiency I would think it’s the valve spring that’s needs tuning to achieve an increase shot count ?
All in all a balance with all three springs.
Just my two pennies.
~ GKU
p.s. maybe in the need of an “Ernest tune”. :8:
~ GKU
Well I don’t mind being the second one. Just figured there were some closet tuners out there at least. Guess that door is still shut?
I forgot to answer your question about cleaning the barrel. I ran a couple of patches through (awkward) and they came out clean enough. I did switch pellets, but other than that…??? More testing to come. I looking at maybe setting up the 16 grain Jumbo Pellet for about 26~28 fpe. Maybe a bit lower. Not looking to take any beasts Just target shoot out to 50-60 yards.
darryl
And, someone has to be the second one ?
~ GKU
I just got around to adjusting the regualtor, and the hammer spring tension. NO chance yet to shoot for results. Busy day. I’ll need to refill my little (44c/ft) air tank tomorrow before going at it anyway.
Surely someone else besides Ernest has started tweaking their Bird? :11:
darryl
Darryl,
I read in the tread below, your experiencing accuracy issues with your new bird ?
Did you clean it’s barrel lately, new barrels often need cleaning about every 150 shot or so. About a mag to lead in and stay with that same tin of pellets, don’t switch from one to another without cleaning again.
Don’t run any metal rods down it, just pull-throughs.
~ GKU
Since the bird landed on our shores, I don’t think so. :rofl:
Just kidding that’s not funny at all !
~ GKU
I wonder if Ole Ernest ever gets a chance to sleep??
Gee, on a new bird I wouldn’t cut anything just yet.
Did you try to adjust the reg and hammer spring to lower your speed ?
To increases efficiency I would think it’s the valve spring that’s needs tuning to achieve an increase shot count ?
All in all a balance with all three springs.
Just my two pennies.
~ GKU
p.s. maybe in the need of an “Ernest tune”. :8:
Viewing 13 replies - 1 through 13 (of 13 total)
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I only ever did that to PCP’s that had no regulator, and a ski-slope shot strings. Cured what ailed them.
darryl