Illusion's already done extensive testing on the matter (so you don't have to), just take his word for it. Really, he DOES know what he's talking about lol

So what's the consensus on this?

A TK Twist barrel on something like a Hi-Capa 5.1 should double effective range and give you tighter groupings (as it shoots at about 1J)?

I'm actually considering running a pistol as a "forward scout/recon" but I have to do a lot of research and info gathering before figuring out the setup I'm going to use and equipment that I need to buy.

From what I can make of it the tk twist barrel is simply a balanced system in which you you bleed hi pressure air around the BB. So the BB is basicly surfing the inside of an annular wave...

For this to work you have to factor in acceleration within the barrel lenght 0 to 300 fps.

Your first constant to control acceleration will be BB mass
So constant BB size and constant will be BB weight are essential...

Because lo weight BB = quick acceleration not enought pressure bleeding to create
the hi pressure buffer you need.

High weight BB = to slow acceleration to much bleeding PROBABLY turbulence and restriction upstream

Now that you have control over the mass you must accelerate you work on the bleeding with the crestes (or grooves) in the barrel. Same problem has with the BB weight.

To big to much bleed, to small not enought bleed to create buffer

The twist (again balanced according to speed/acceleration) in the barrel keeps the air from the high pressure wave plastered again the walls to restrain its effect (turbulence etc) on the BB.

So from knowing this I would have to guest that someowe... I japan 300 fps must be somewhat popular...

or that they could not manage tuning at higher FPS

((this is over simplied has there must be a lost to consider in actual overall barrel size to allow optimal lateral movement within the vortex..))

Regards,

Pete

So yes... only works with .20 BB and 330 FPS must be a Maximum... faster then that precision degradation must be.... horrible

I say put a TK twist on it if you play indoor or where there is no wind or bushes. With 330fps I had trouble shooting through small bushes with very little density, that and I could see the winds take the bb (especially .2) and now play between 360-370 fps. Honest though I feel a need for more range as some hot guns that are shorter barrel length outrange me.

I just ordered a Systema M100 Spring to put with a 509mm TK Twist into my M16, I was told about 350 Fps Maximum and according to 2004 spring chart, this would pull 360 new, so decreasing would have got me "in the zone". I'll make outdoor test once I get the chance to measure precisely while putting 280 FPS on .25 and after that with the new spring, to compare the grouping at equal distance and conditions.

Heavier BBs will fix those issues for you, minimum 0.25g, but 0.28g are better.

You'll notice that the spring chart was done with an P90 (chosen for it's well sealing hop up unit) and there are also upgraded (for sealing and efficiency) parts in there, so the chart isn't 'perfect', even though it's well done. But ya, Modify 100 springs tend to sit guns around 360fps as well.

Then it might just suit in as well, it is rated 365 on the chart, I've heard that max FPS with a TK twist was around 350, now there's proof that it suits best under 330, so I think I'll be in the optimum zone while I might have little air leaks, but I tried different nozzles and this one doesn't leak. Can't wait to see if I can reach a sniper-like grouping :)