New oleopneumatic invention traction roller Dyneema

A shock absorbing column using an oil damper arrangement is now used to slow the sliding oval piston down before it strikes the rear bulkhead during the shot. A composite photo indicates how this additional refinement has been integrated into the conical nose of the rear bulkhead.

Pete I wonder if this piston damper and bits have recently been added to the prototype design?
That could be the reason for a delayed production. I really like the use of fluid dynamics to help slow down the piston energy. I cant wait to put one of these guns in my sons collection some day.

Cheers, Don

Quote from Don Paul

Pete I wonder if this piston damper and bits have recently been added to the prototype design?
That could be the reason for a delayed production. I really like the use of fluid dynamics to help slow down the piston energy. I cant wait to put one of these guns in my sons collection some day.

Cheers, Don

Yes, I think that could be the reason as the piston slamming into the rear bulkhead would deliver a substantial thump to the structure of the gun if there was no shock absorbing system in place. The conical nose of the rear bulkhead, and the matching recess in the rear end of the sliding piston, were probably shaped that way as a form of hydraulic shock absorber using the existing oil supply in the rear tank, but with the oil pooling at the bottom of the tank (due to gravity with the gun held horizontally) it would be forced upwards only in the very last section of piston travel. Hence the hydraulic action shock absorber would be deprived of a fluid to pump and would then be effective only when the volumetric capacity available had substantially closed up.

More views of the axle components; note how the outer winding drums have "inboard" conical wells that allow them to be fitted over the axle support housings to make for a very compact installation.

Now some photos as to how the cables are attached to each of the winding drums. A loop formed by splicing the cable ends allows the respective cables to be attached onto their drum anchor positions without using any knots. Therefore the gun owner should be able to replace these cables fairly easily when they need changing due to wear and tear as where they fit is basically fixed in position by the design.

The rear bulkhead and non-return valve are seen in these views. The non-return valve eliminates air from the rear chamber. Note the valve's position with respect to the shock absorbing assembly that slows the piston at the end of its power stroke.

Here is the loading device for "arming" the cable wishbone drive. Another variation of the loading device has a pulley attachment (which will be shown next) in order to create a mechanical advantage as you summon your strength to haul the wishbone(s) back to engage the shaft.

The connection of the barrel (actually the tank) sliding piston to the inner drive cable is shown here.

A special multi-purpose tool has been created for routinely servicing the "Dreamair" speargun and is shown here.

Head removal using the special tool's ring spanner.

Very nice service bits..
Thanks Peter

Cheers, Don

Pressurizing the "Dreamair" gun using the special hand pump provided with the gun.

Latest news is the Australian Patent for the "Dreamair" gun design has recently been granted and a scan of the document's front page is attached.

Quote from Ramon

Pete ¿vas a fabricar el fusil?:D

Si lo esta patentando en diversos países puede salir caro el porcentaje de las tasas cada mes de las patentes durante
10 años y su renovacion, si no se da salida en el mercado internacional al invento.

Yes, maintaining International patents in many national jurisdictions is very expensive, plus the most important would be a patent in China, although then it may simply provide a handbook for copycats who care nothing about rules. Interestingly LED LENSER, the flashlight company that is notionally a German company, has many Chinese patents taken out by Chinese nationals judging by the applicant/inventor names on those patents.

As for Australian manufacturing, that is nearly "dead and buried" thanks to ideologues in government who know nothing about running a manufacturing business, but have often worked as receivers (most are ex-lawyers) as a company is being dismembered.

Quote from Ramon

PETE Bueno pues espero que sea un éxito y funcione como un reloj Suizo todas sus piezas
una buena publicidad acompañen a esta obra de arte de la ingeniería :thumbsup2::D

After all the time and effort, and no doubt a very large amount of money being spent, we all certainly hope that will be the case!

Well it looks like the oval air tank, which is also the "Dreamair" barrel, has crescent shaped side tanks after all as here you can see the mounting studs for the muzzle nose piece sticking out on either side from some grey stuff that is filling the side tanks. Winter time now in Greece, so not much diving going on I would think as the snow comes down.

The first video of the "Dreamair" in action.
(The production started on Friday)
https://l.facebook.com/l/ATOa0…Fv%3Dk8OnOEnvsB0%26t%3D3s