Heavy pistons need a lot of spring to accelerate up to speed to make the pressure. If the seal is a bit below par too, it's not a great combination.
Always looking for any cheap, interesting, knackered "project" guns. Thanks, JB.
Always looking for any cheap, interesting, knackered "project" guns. Thanks, JB.
........And, maybe the higher mass of the big, heavy piston maintaining more momentum to combat piston bounce, Jon? Then they later implemented the inertia piston. I wonder, was the mass of the piston lighter, giving quicker acceleration and, maybe, higher efficiency, with the delayed "dollop" from the inertia piston there to combat the bounce? Seem to think that combatting piston bounce was the main raison d'être for the inertia piston.
THE BOINGER BASH AT QUIGLEY HOLLOW. MAKING GREAT MEMORIES SINCE 15th JUNE, 2013.
NEXT EVENT :- August 3/4, 2024.........BOING!!
Nah, I'm totally with you on this one, Al.
Hence I have loads of boingers and not one single gas ram.
Occasionally I have a daft little notion of maybe adding a '90 to my HW gang, but feel that if the time came I'd most likely end up buying another trusty springer anyway.
THE BOINGER BASH AT QUIGLEY HOLLOW. MAKING GREAT MEMORIES SINCE 15th JUNE, 2013.
NEXT EVENT :- August 3/4, 2024.........BOING!!
err... 'cos they don't "boing" ?
Always looking for any cheap, interesting, knackered "project" guns. Thanks, JB.
THE BOINGER BASH AT QUIGLEY HOLLOW. MAKING GREAT MEMORIES SINCE 15th JUNE, 2013.
NEXT EVENT :- August 3/4, 2024.........BOING!!
This is getting beyond my knowledge, but anyhow..
Marconni of USA FWB fame has two spring set for the Sport: Old School and New. Basically the short and long springs have the same power when compressed; latent power. Everything else is to do with the chamber and how all that energy is transferred by air pressure to the pellet and as that pellet travels along the barrel until free. And still leave an air cushion for the piston to come to stop with out slamming into the front of the chamber.
I had great success with Theobens once they refined their designs. All shot very well. Non had any power or consistency issues. My Fenman hasn't missed a beat in 20 years.
Far too many rifles to list now, all mainly British but the odd pesky foreigner has snuck in
I tried a short Maccari spring in my FWB Sport, it was alot easier to fit but I think it shot nicer with the longer spring. The Theobens have triggers which are poor in action considering the cost of the rifle, I can only think people are buying them because of they are unusual and have rarity status. How many HFT or old school FT competitions did they win? or even come in the prize list. Probably have the same power/accuracy performance as a tweaked BSA Meteor, with half the style.
Far too many rifles to list now, all mainly British but the odd pesky foreigner has snuck in
Better piston seal will always help, Pete.
Lighter piston in a wider bore gun will certainly give quicker piston acceleration, Pete, but might not make it nicer / any more accurate as, depending on other set-up parameters, you're more than likely to get greater piston bounce, which is much more detrimental to better accuracy / improved hold sensitivity.
I've sometimes wondered in this scenario, however, if we went for an aluminium piston to reduce overall weight, but a nice, heavy steel top hat (idea here thinking of increasing the cross sectional density) if this may help?
Any thoughts, JB?
Of course, going back to the original flavour of the thread, at our power level, narrow bore is always going to be best.
THE BOINGER BASH AT QUIGLEY HOLLOW. MAKING GREAT MEMORIES SINCE 15th JUNE, 2013.
NEXT EVENT :- August 3/4, 2024.........BOING!!