Has Anyone Tuned the Hatsan Flash to be more Efficient?

[SwampHunter]

Not sure what was done to it before I got it as it was a refurb but my .25 gets 3 good clips, 4 if you don't mind it being outside if 4% , @ around 40fpe

[Rallyshark]

Hey Guys,
I was thinking of buying another PCP and the Hatsan Flash (Wood version) coming out soon has tweaked my curiosity .  Hard to believe - a light weight Hatsan .
 
Has anyone tuned this gun in either .177, .22 or .25 caliber to make it more efficient? 
It's likely ported to .25 caliber out-of-the-box.

Because it has a 165cc tank, it should be able to get 30/40 good shots in .177 or .22.
I'm assuming the gun comes with the usual, Air Hog - Hatsan valve?. 
Has anyone put a Huma regulator in the gun to improve consistency?

Any help is appreciated

I did a thread on the power side of things mostly a while back, but since you asked about efficiency...  They are actually are pretty efficient all things considered.  You can definitely improve upon that though.  They are actually not ported for .25.  They tend to be somewhere in the middle for the average power level.  I opened up the valve seat/barrel port on both of mine.  I opened up the transfer in the .22 as well.
A regulator helps as long as you aren't going for too much power.  I tend to mod all my guns for power, then tune them down. 

In .22 I think I was able to get 36 shots in the 30fpe range regulated.  In .177 I was able to get 56 shots in the 18-19 fpe range regulated.  I think they are awesomely simple guns, that just work usually.  They are very light weight, which makes them great hunters.  I was also able to get my .22 to do 24 shots at 41 fpe unregulated with the 33.95 JSBs.  So yeah, they can be tuned to do pretty much whatever you want

to what diameter did you open the port on the .22?

I opened my transfer to 3/16", but you may want to try 11/64" if you aren't going for absolute power.  3/16" on the barrel port is getting large, and could cause some loading issues with smaller pellets.  I'd recommend going with 11/64 on the barrel and making it slightly oval shaped to gain a bit more opening without loading issues. 

[dec11ad]

Hey Guys,
I was thinking of buying another PCP and the Hatsan Flash (Wood version) coming out soon has tweaked my curiosity .  Hard to believe - a light weight Hatsan .
 
Has anyone tuned this gun in either .177, .22 or .25 caliber to make it more efficient? 
It's likely ported to .25 caliber out-of-the-box.

Because it has a 165cc tank, it should be able to get 30/40 good shots in .177 or .22.
I'm assuming the gun comes with the usual, Air Hog - Hatsan valve?. 
Has anyone put a Huma regulator in the gun to improve consistency?

Any help is appreciated

I did a thread on the power side of things mostly a while back, but since you asked about efficiency...  They are actually are pretty efficient all things considered.  You can definitely improve upon that though.  They are actually not ported for .25.  They tend to be somewhere in the middle for the average power level.  I opened up the valve seat/barrel port on both of mine.  I opened up the transfer in the .22 as well.
A regulator helps as long as you aren't going for too much power.  I tend to mod all my guns for power, then tune them down. 

In .22 I think I was able to get 36 shots in the 30fpe range regulated.  In .177 I was able to get 56 shots in the 18-19 fpe range regulated.  I think they are awesomely simple guns, that just work usually.  They are very light weight, which makes them great hunters.  I was also able to get my .22 to do 24 shots at 41 fpe unregulated with the 33.95 JSBs.  So yeah, they can be tuned to do pretty much whatever you want

to what diameter did you open the port on the .22?

I opened my transfer to 3/16", but you may want to try 11/64" if you aren't going for absolute power.  3/16" on the barrel port is getting large, and could cause some loading issues with smaller pellets.  I'd recommend going with 11/64 on the barrel and making it slightly oval shaped to gain a bit more opening without loading issues. 

Do you have the wood version on the .22? Have you installed a regulator? Asking cause I’m wondering what size the inside diameter of the tube is as I heard it is different from the synthetic flash.

[Rallyshark]

I haven't bothered measuring the ID of either of the cylinders myself. I can tell you the steel cylinders ID is larger though.  Huma makes a reg for both cylinder versions. They have them listed on their site.

[Warmpudgy]

I found this post in my searching and wanted to give my experience with tuning my .25 Flash

When I bought the gun, I also bought some 20 grain pellets to go with it. My thinking is they would achieve the advertised 900 fps, and fly flatter.  Did they shoot flatter? Sure. But accuracy was horrible.

So I started tuning the Flash down to shoot these accurately. Spoiler: these were crappy pellets, and wouldn't fly straight at any speed.

I got a huma regulator, and set out to de-tune.

I tried every combination of air pressure, and hammer spring pressure. I could not get these to slow down or fly straight. The hammer was hitting to hard.

So I tried a weaker, shorter hammer spring from my Crosman 2240. I had some limited success.

The biggest problem was the spring was about 3 windings shorter. Used a spacer to fill the gap. More success.

But then I hit a point of diminishing return, where compressing the spring more and more only made it harder to cock the gun. The spring would kink up and not go inside the hammer.

I'm getting tired of typing this already. So long story short I put the OEM spring back in. Cut about 4mm off the set screw inside the hammer so it could go deeper. I also had to remove some threads inside the hammer to allow the spring to travel deeper to meet with the set screw.

And voila. I can reduce the power signifcantly.

With the 20 grain, the lowest spring setting, 120 bar,  I could achieve 800 fps and 50 shots before dropping off the reg.

Right now I have settled on 160 bar. And with only the changes to the hammer, it shoots JSB 25 grain at 715 fps and 20 shots before dropping off the reg.

[rong1966]

Has anyone been able to tune a .22 Flashpup to under 20 fpe?  I have been thinking about getting one to shoot benchrest (heavy varmint) and maybe field target.

[Rallyshark]

Has anyone been able to tune a .22 Flashpup to under 20 fpe?  I have been thinking about getting one to shoot benchrest (heavy varmint) and maybe field target.

That's super easy to do.  It's just a matter of less hammer spring, and that would be a good tune for a regulator

[Ribbonstone]

Without a regulator....it gets more complicated.

Lowering the striker spring tension will also lower the "best"sweet spot (the pressure range that shoots the most conisistantly). 

But it will get you,with enough testing,to some limited pressure area where all the shots are  pretty uniform (like 2%),just not a very long shot count.
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Had a choice when woring with two new .22 PCP's: an Urban and a Flashpup. HAd no real use for two of the same power.  HAd to pick one to go slower (about 19-20 foot pounds) and one to go faster (about 33-34 foot pounds).

But for this discussion,picked the opposite one as the quiet-slow one....adjusted the Uban to 18-21 foot pounds....also played with the Flash, but more like 31-24  foot pounds.