Slomo study Feinwerkbau 124 recoil spring piston bounce vintage air rifle 1985 fwb124 airgun

Short study of the spring action on a 1985 .177 Feinwerkbau Sport.
Interesting to note the piston bounce as well as the spring vibrations and waves.
original spring with new piston seal, shoots beautifully.
One of the most accurate spring piston rifles ever made. Still goes boing though!

[@mus1970]

Amazing that you say it shoots beautifully, I'd never have expected that after seeing the spring twang/bounce. Thanks for sharing!

[@dkjngl1]

All that twang happens after the pellets left the barrel… and it doesn’t even sound that twangy at normal speed. Crazy really…I’ll do an accuracy test to show it in action.
Cheers

[@dearne75]

Amazing.Does show how much our springs in our springers get a real workout with every shot fired!

[@michaelgriffiths4916]

An excellent piece of work, thank you for sharing it - this clarifies the mystery of spring guns and should help with our efforts in tuning with understanding!

[@dkjngl1]

considering that the rifle used shoots very well I was surprised by the amount of piston bounce! Thanks

[@tommy6006]

Fantastic bit of filming

[@junglie]

My 124 shot beutifully with a maccarri mongoose kit in it, it did twang but cured that with a homemade piston lube sleeve, was just a dull thunk after that with single figure deviation in fps. Wish the trigger was as nice or I'd still have it.

[@davidprocter3578]

This is something I find fascinating I cannot stop from replaying the video. It has always been my contention that to improve springs , shot cycles, pistons that this is exactly the sort of science required, But to do this any justice would require time and money just to get the footage then there is the time required to analyze data collected, ad in gas rams and you could be looking at two or three years work for a team of three to five people.. Back in the late sixties Pilkington glass developed a ceramic glass mix they used to make experimental hammer heads with it struck me forty years ago that cylinders make of this tough glass would allow transfer ports to be studied and improved. With our twelve fp limit why bother, two good reasons the export market and more powerful cylinder design would allow them to be made smaller introducing new avenues for airgun design.

[@dkjngl1]

I love the idea of a ceramic glass clear cylinder. I wonder if a machined polished ABS cylinder could handle the pressure?
Glad you found it of interest

[@davidprocter3578]

@@dkjngl1 ABS might with the right design , as long as not too much was expected of it. Probably need to be a sealed for life unit. Yes the glass cylinder would allow for slow mo study with a puff of smoke, I'm sure you have the picture.

[@dkjngl1]

Unfortunately I won’t be able to do any more Slomo footage. The studio owner gave me several thousand pounds worth of studio time for free so I’ll never have another chance! I have some more footage to share at a later date though. Cheers

[@davidprocter3578]

@@dkjngl1 That is a shame . There are two Brits working with slomo gear in the states putting content out on U tube I wonder if they would be interested.I will try and track down their site and let you know.

[@dkjngl1]

@@davidprocter3578 I had previously tried to contact them but got no response and I'm in the U.K so it wouldn't be practical. Not to worry, I have many different vintage airgun video's I want to make and have most of the slomo footage I want.
I have uploaded an unlisted frame by frame version of this video. each frame is half a milisecond so you can count exactly how long each stage is. it freezes every fifth frame so don't count these! We believe the pellet would have exited 26frames in, approx 1- 2 milliseconds after piston bounce.
th-cam.com/video/BOfPZs4nuKs/w-d-xo.html

[@davidprocter3578]

Good stuff.

[@GrahamHenderson25x]

brilliant! .... lot of boing going on and on and 😄

[@Relaxbadkneeadventures]

Niceeeeee