Is it wrong...

[TonyL]

Way back in the dawn of time (around 1985) me and my mates had air rifles. FWB, Airsporter, HW80 and an ancient and very poor Hw35. The 35 belonged to Tim, or rather his dad. We all know a Tim, he's the kind that'll sit in a tree for three hours to know what its like to be a squirrel. He's the sort that'll strip all the bluing off his dads air rifle, and all the varnish so he can paint it camo. Badly! So, the gun was massivley oversized with that ridiculous (and bent) barrel, it was painted many kinds of gloss (which still didn't hide those 1950's wooden pencil case grooves down the side of the stock) and to top it all he used to make his own pellets by drilling holes in a plank of wood and tipping molten lead into it! The whole cumulative experience of being near an HW35 was one of wonder at the crap design, looks and performance.

Since then whenever I think of a 35 I get a tight little knot of anger deep inside me. I loathe them!

'Kin 'ell, Nick!

No wonder you show so much hatred towards this rifle after such an introduction.

And Tim sounds like a right muppet!

[tinbum]

'Kin 'ell, Nick!

No wonder you show so much hatred towards this rifle after such an introduction.

And Tim sounds like a right muppet!

See? Its nothing personal! I've even worked on them.

[Clanchief]

You must have been right posh making pellets, what I had and used when I ran out we dug them out of fence posts and reused them by squishing them in the tap of my Airsporter with a nail, I be heard of people on some ranges dropping a pellet and not picking it up,,,,,,, what's the idea with that? I'd have a bit of gum on my shoe and go along Riverdancing picking them up.

[pelletcaster]

HW35's are something special on their own.
Mine was my very first AG and the one I started fettling with many years after the purchase.
Still love it.

One thing you should know:
Simultaneously to the introduction of the HW77 in 1980 the HW35 design was changed from leather to synthetic piston seal (from ser.no. 843636 on).

The transfer port size of the leather seal models was about 4,2 mm.
If nowadays you like to switch such an old system to a synthetic seal, easy-peasy with an adapter, the TP-size should consequently be reduced to about 3,0 mm.

Easily done by gluing in a brass tube like the ones available here:
http://wasana-airgun-tuning.de/shop/sonstiges/
Please scroll down little bit to:
Messingröhrchen 4 x 0,5 x 30mm für HW35 alt

[vestlenning]

HW35's are something special on their own.
The transfer port size of the leather seal models was about 4,2 mm.
If nowadays you like to switch such an old system to a synthetic seal, easy-peasy with an adapter, the TP-size should consequently be reduced to about 3,0 mm.

Easily done by gluing in a brass tube like the ones available here:
http://wasana-airgun-tuning.de/shop/sonstiges/
Please scroll down little bit to:
Messingröhrchen 4 x 0,5 x 30mm für HW35 alt

Mine is a 1980 leather, now plastic piston seal. Nothing done to the TP but the rifle works just fine, consistent at about 220 m/s with JSB Exacts.

http://barx.org/airguns/?id=hw_35

[pelletcaster]

Mine is a 1980 leather, now plastic piston seal. Nothing done to the TP but the rifle works just fine, consistent at about 220 m/s with JSB Exacts.

http://barx.org/airguns/?id=hw_35

Thanks
and congrats - nice gun.

BTW - do you have the TP-Dia dimension?

[pelletcaster]

Mine is a 1980 leather, now plastic piston seal. Nothing done to the TP but the rifle works just fine, consistent at about 220 m/s with JSB Exacts.

http://barx.org/airguns/?id=hw_35

Thanks
and congrats - nice gun.

BTW - do you happen to have the TP-Dia dimension?

[Geezer]

HW35's are something special on their own.
Mine was my very first AG and the one I started fettling with many years after the purchase.
Still love it.

One thing you should know:
Simultaneously to the introduction of the HW77 in 1980 the HW35 design was changed from leather to synthetic piston seal (from ser.no. 843636 on).

The transfer port size of the leather seal models was about 4,2 mm.
If nowadays you like to switch such an old system to a synthetic seal, easy-peasy with an adapter, the TP-size should consequently be reduced to about 3,0 mm.

Easily done by gluing in a brass tube like the ones available here:
http://wasana-airgun-tuning.de/shop/sonstiges/
Please scroll down little bit to:
Messingröhrchen 4 x 0,5 x 30mm für HW35 alt

I think that is correct on the 35 TPs and seals.

On a point of detail, the 77 came out in 1984. The 35 TP/seal change happened earlier and independently of changes to the 35.

[T 20]

If nowadays you like to switch such an old system to a synthetic seal, easy-peasy with an adapter,

Now I wouldn't bother with the adaptor on the leather sealed piston to convert to a synthetic seal for three good reasons.

1) John Knibbs is knocking out synthetic sealed Pistons complete with seal at £30.

2) The adaptor adds 27grams to an already heavy piston.

3) The adaptor reduces the already short stroke of the leather sealed piston by another 4mm.


Here's the three strokes and weights of the three setups :-

Factory Synthetic sealed piston ------------- 69mm stroke - piston weight 264g

Factory Leather sealed piston --------------- 65mm stroke - piston weight 294g

Leather sealed piston adapted to synthetic - 61mm stroke - piston weight 321g


Saying all that I do like to start off with the old leather sealed piston as you can machine the nose back easily to end up with a lightened piston with a 71mm stroke.




All the best Mick

[Artfull-Bodger]

321g

[pelletcaster]

My thanks to

T 20 / Mick
&
Geezer

for their - at least for me - valuable information.

[vestlenning]

Now I wouldn't bother with the adaptor on the leather sealed piston to convert to a synthetic seal for three good reasons.

1) John Knibbs is knocking out synthetic Pistons complete with seal at £30.

2) The adaptor adds 27grams to an already heavy piston.

3) The adaptor reduces the already short stroke of the leather sealed piston by another 4mm.

Depends. My 35 has an adapter and plastic seal and is consistent at about 220 m/s - plenty for my use.

[Arthur John Smithsplease]

Now I wouldn't bother with the adaptor on the leather sealed piston to convert to a synthetic seal for three good reasons.

1) John Knibbs is knocking out synthetic sealed Pistons complete with seal at £30.

2) The adaptor adds 27grams to an already heavy piston.

3) The adaptor reduces the already short stroke of the leather sealed piston by another 4mm.


Here's the three strokes and weights of the three setups :-

Factory Synthetic sealed piston ------------- 69mm stroke - piston weight 264g

Factory Leather sealed piston --------------- 65mm stroke - piston weight 294g

Leather sealed piston adapted to synthetic - 61mm stroke - piston weight 321g


Saying all that I do like to start off with the old leather sealed piston as you can machine the nose back easily to end up with a lightened piston with a 71mm stroke.




All the best Mick

Sorry, but did I read that right.

Are they made of nylon or carbon fibre for example.

Does the reduced weight of such a piston make for a much smoother action?

Or did you mean their own metal pistons with a synthetic seal?

[T 20]

Sorry, but did I read that right.

Are they made of nylon or carbon fibre for example.

Does the reduced weight of such a piston make for a much smoother action?

Or did you mean their own metal pistons with a synthetic seal?

Sorted it for you Arthur

[Arthur John Smithsplease]

Thanks a lot.

Thought it was probably a slip of the pen.

But you never know.