Nice - much flatter curve but falling so
better, and power up to closer to the limit - but much lower shot
count ! way too low something needs adjusting !
My first thought was that the valve in the gun was staying open
for longer than required so the pellet is well on the way to the
target before the valve is closing -
I needed to prove this before messing around - as my brother
tells me "lets not make the problem worse by guessing " so
It occurred to me it would be good to see what an efficient gun
uses air wise to prduce a full power shot ......
A childs balloon was sourced and put
on the end of the barrel of the C-State gun
and the trigger pulled, the neck of the balloon quickly closed to
capture the pulse of air
this was then bubbled into a graduated container and
measured 150 ml of air per shot - a good starting point ! I
now have an idea of what to aim at, - a full power shot is
possible from a simular gun with 150 ml of air
Next job repeat the balloon test on the Hatsan - result 300 ml of
air - double per shot - something needs adjusting here ! the gun
is not working efficiently
I decided to strip the gun and reduce the pre load on the hammer
spring - one turn cut off , reassembled and tested - great we are
down to 200 ml of air per shot better but not great - we still
have 11.6 ft lbs so no loss of power just not wasting so much air
the valve must still be open when the pellet has left the barrel.
another strip down
half a turn from the hammer spring - rebuild, now 160 ml of air,
this is the current state of play as i have some more mods in mind
and will revisit the spring when i have completed these
I think a total result - the gun is now using almost half the air
it was / shot and still giving full power
shot string after tuning
Update 12/01/13
took the gun to the club today - filled to 200 bar
took a crono reading - 11.6 ft lbs
took 90 shots checking the output every tenth shot (to cold to
take every shot and the logging not yet sorted)
shot 100 the power had dopped off to 11.2 Ft Lbs
total result 100 shot at very good power