Thanks for the hints. I will get everything together.
@Pjk how much line did you put on your Cyrano 1.1 finally? Would 5m be enough after mounting the vacuum muzzle?
I would use 4.2m (3 wraps) of line but with the dry muzzle you could maybe run 5.6m of line however it feels like reel territory once you go past three wraps and you’ll probably get tangled especially with thin line so it’s not worth it.
The spear likely won’t have effective penetration past 4m anyway since the 11mm barrel with a 7mm shaft is more of a lightweight, close up shot design even with a vacuum seal muzzle it still loses momentum after 4m, 13 feet is just enough.
The 7mm shaft rod is very light and the compression ratio or whatever in the 11mm size pneumatic is less efficient than say a larger 12 or 1.3 (13mm inner barrel) and so I don’t know for sure how much line length is truly worthwhile but three wraps seems appropriate at max power & configuration.
Before the first test I had to dunk the shaft & seal in the water to lubricate surfaces to save the seals from friction damage & after doing so I didn’t pour out all of the water that had entered the barrel since I thought there wouldn’t be much, it was sunset nearly dark & when I shot the spear with water in the barrel it dribbled out/lost momentum after only two meters as water had congested the shot.
The vacuum cuff was fine, no blow out of any kind so I loaded it up again and without most of the usual recoil it fired with great power.
The shaft stripped the crimped mono line connected to the slider seemingly without resistance and continued with speed striking the end of the pool @7m on the same trajectory ending my testing that day.
Something worth noting is the Salvimar vacuum muzzle has little success if the barrel is filled with water and so technically it can’t be loaded underwater unless the tail is already in the piston and you load it without compromising the seal after submerging with the gun.
I would say 15-20%* more powerful is somewhat accurate after transitioning from wet barrel to the vacuum seal with minimal testing.
I need to test another day to be sure and then I will report my findings.