Technical Analysis of the HW100

[ETA]

Ok, so have to turn a bit back (I mean to left) the C3 allen?

And what about this spring on the picture? Is it on the right place?

Thanks Anno!

YW tgif.

Anno is correct you need to lower the regulated pressure a bit to balance the output. Back out C3 a bit (turn anti-clockwise).

The spring looks about right. You can see part of the spring on photo of the trigger assembly removed on part D.

[tgif]

Thanks ETA! I removed the C3 screw just to have a look on the dish springs, mine is in this order: ))))(())(())((((. So first time I turned C3 until I didn't hear the noise from the springs as I shaked the block. When I tried I got 26m/s
Next time I turned 360 degree, and I got 166m/s and it was very steady. I need around 177m/s to the HN Field Traget Trophy and then it will be around 16J. So I think I'll turn about 1/8th on the C3 and then I'll play with the hammer spring if necessary...

About the spring on the picture: my problem is that sometimes it is jumping out of the block... As you see on the drawing there'd be something with the same number and I think it supposed to be some kind of fixing thingy which has to keep in place that spring...


Thank you again for this excellent topic!!!

[tgif]

Went out to the range yesteray and the gun performance was very steady: 64 shots were firing and the Vo was between 166.8m/s and 167.9m/s.
I noticed that air consumption jumped to double compared the earlier settings: 20bar dropped by 14 shots.

Now I turned the regulator screw inward 90 degre and measured 180m/s steady with one magazine around 140bar in the cylinder. Afternoon going out to test more.

Btw: anyone realiyed that HW 100 has a polygone rifled barel? (at least close enough)
Polygonal rifling differs from conventional rifling in that instead of lands and grooves, the shape of the interior of the barrel resembles that of a polygon. The advantages of polygonal rifling are that it gives a better gas seal with less bullet deformation resulting in slightly higher muzzle velocity, slightly better accuracy, easier cleaning characteristics, and a prolonged barrel life.
The only drawback is: can't use too soft lead on high speed...

[Anno]

64 shoots are too few. You should get about 110 at 16 Joule.

If the V0 has increased by turning up the regulator only the hammer setting was too high. Again, you have to find the optimal setting (max. V0)of the hammer spring for every change on the regulator, it's an iteration process.

[tgif]

With 180m/s and HN FTT 5.5mm pellets (weight is 1gramm) I can shoot around 100 between 190bar and 100 bar, so no problem. And the velocity is steady, the max deviation was +0.7m/s and -0.3m/s to 180m/s.
Tomorrow I'd like to test on 50meters because on Saturday will be a Hunter Field Target competiton

[les175]

How did the competition go.....been a month... must have been pretty bad, huh/??

[steve j]

can any body help. need pics if poss

[tgif]

The Hunting Field Target competition:
Thought nobody interesting, plus my poor English so.... but just for you les157

Just before started I changed my mind and zeroed the gun to 35m (originally it was on 20m), and also I swapped to JSB Exact Jumbo from HN FTT, because I ran out of HN but anyway I wanted to use JSB. (Now here some of our guys using RWS R10 and they say that's excellent)

I ordered a Nikko Stirling Platinum scope but something hapened in Japan my shop didn't get the shipment in time so I bought quickly a Walther 3-9X40AOE scope. On HFT competition we can't use more than 10x scopes and we could change one time the paralax before we looking through the scope so wasn't a big drawback but I really missed the MIL dot reticle.

We started to shoot, and all what I knew my bullet will hit in the centre of the crosshair on 10m and on 35m, between this distance the pellet will be somewhere abowe.
I wasn't any problem with the targets over 30meters but I missed some between 10 and 20. So at the end I was the third but another two guys got same points which wasn't so bad becouse one of them was the Hungarian FT champion, and the other one also standing between the first three. Looks the Hunting FT a bit different so they couldn't use the advantage of the hell expensive scopes, calculations, diagrams, and God knows what else
So at the end 3 target were selected, and all three of us had to shot at standing position, on the knee, and laying on the ground. During the competition I missed 2 of them on this place but now from laying and on the knee I hit all of them. In the standing position my first bullet missed totaly, not just the hit zone but the steel owl as well (still no idea why) so I gave it up and sent the other 2 pellets in the hell too.

Anyway, I was happy, with my new gun (actually it is a second hand from a shooting club), new scope, new pellet, and new style competition wasn't too bad performance especially if I say that I was the only one with 5.5mm gun .
At the end there was a zeroing pad (sorry I don't know the English name) so we fixed my gun, pointed to 35 meters and I shoot a full magazine quickly without reaiming. All bullets hit in a around 1-1.5cm circle so I said thanks God for that barell on the gun

If anyone interesting, here is a link to our FT pages:
http://www.mftp.hu/pages/versenyek_2006.html
Unfortunately all in Hungarian languages but check the Fotoalbums

[gee]

ok i have read the post in this thread and a newbie to pcp and have got a new hw100. im in the uk and my rifle is set to around 11.5 foot pound.

i want to uprate the power to about 18 -20 foot pound . is all i need to do strip down my rifle to get to picture d2 then take out the grub screw then wind in the larger allen key a little put rifle back together and keep putting through a chrono till i get the required 18 or 20 foot pound i want ?.

i would be very greatfull if anyone could help me tune my rifle in laymans terms please .
thank you

[Norfolkngood]

Gee
If you are not a registered firearms dealer in the UK you cannot just turn the power up even if you have a FAC for the gun. Better to send to a specialist tuner with your FAC, although I don't know of any in the UK as yet. Failure to do so could result in imprisonment and confiscation of the gun.
If you have a recent UK HW100 they do not have the screw adjustment as it has been locked at the factory. I did find a link to a German site that sold stronger hammer springs but I don't know if this is the only modification required.

[tgif]

Just curious: what for that small hole on D picture just below the clip/magazine release slide?

[Fuji]

www.ginb.it

[Frogfoot]

Hi again,
I have recently dug out my hw100 after a few months of being away and noticed that the shot count between fills was low. (about 80 before the velocity starts to drop)
I have a cyclone fx cylinder mounted on it 148cc compared to 175cc (so 85% of the original volume) however in .22 the quoted shot count is 140 per fill for the standard cylinder so I would expect 120 ish.

I have balanced the reg and hammer spring as this thread indicated and now I am very happy with the spread over the 80 shots...

Min Vely 569.00 fps
Max Vely 581.00 fps
Spread 12.00 fps
Average 576.07fps
Stndard deviation 2.27

Average power 11.7 ftlb

However I am still concerned about the small number of shots does anyone know what could cause this problem?

Cheers
Tom

[Jitters]

my only criticism is the bad styling of the front of the end of the stock ,that backward angle is harsh and jars . it needs softening and chamfering to blend it in. A foreward angle would look better .IMO.

[Mulby]

My HW100s developed a leak yesterday. I had removed the cylinder to fill it, and after filled I reatatched the cylinder to the gun and it immidiately began to hiss from the breech area.

Thanks to Eta's great photos and explanations, I was able to diagnose the problem and fix it myself quickly and easily.

As it turns out one of the hex bolts that holds 'C1' to 'C' had worked itself slightly loose, allowing air to leak past the outter seal on 'C1'. I snugged it up and reassembled, tested it, problem solved in all of 10 minutes.

The gun is extremely well made and very simple in design, and thanks to Eta's posts very easy to service/adjust. I haven't made any adjustments yet but in the future(winter) I'm going to play a bit and see if I can get a bit more efficiency out of it.

Thanks again Eta,

Mulby