http://ww2airsoft.be/phpBB3/viewtopic.php?f=27&t=1338
I think you don`t need to be able to speak Flemish to see 10,000 BB`s in a couple of minutes for fire power 
Anyone brave enough to have a go at making one?
Boshman was looking at doing this a while back.
You've got nothing to ein, zwei, drei, vier
When I first started airsofting, there was a lot of ideas over the 'vortex' design of BB flamethrower - a mate and me built one.
Other examples of the design idea:
It certainly spewed out the cheap BBs, but the range was pityful as there is no hop and you have to have a high air pressure flow to sustain it. As there's a high output of BBs, this can very quite damaging to he look and ecology of a site, so the low tollerance requirements of the projectile allowed dried peas or corn curnells to be used. Very nice looking backpack they've made for that one though!
This .50cal has a vortex system inside, even though he's pointing the barrel slightly upwards from vertical, the drop-off of the BBs into the pond is pathetic.
http://www.youtube.com/watch?v=LQYYLV5-yhk
A Proud Member Of 'Team Spleen!' who play mainly at Gunman Airsoft, Tuddenham, Suffolk.
Isnt the maker on this forum? i recognise the name+ picture.
WW2 Weapons AGM Sten, AGM MP40
He is indeed a member of this forum, and he also looks after the WW2 airsoft Europe website and forum and has also played WW2 airsoft games here in the UK.
This .50cal has a vortex system inside, even though he's pointing the barrel slightly upwards from vertical, the drop-off of the BBs into the pond is pathetic.
Is this because you have several BB's in the barrel at the same time hence some drop close and some far 
You really need only one projectile in a barrel at a time to get consistent results.
Much like a shower shell, I was going to use a moscart on the tank but when I tested one and it only had a range of 60ft I could see no point.
However room clearance with a Flame Thrower is different but I suspect a CO2 fire extinguisher system may be more on the lines and no BB's at all in a room. 
Free speech is expensive these days!
This .50cal has a vortex system inside, even though he's pointing the barrel slightly upwards from vertical, the drop-off of the BBs into the pond is pathetic.
http://www.youtube.com/watch?v=LQYYLV5-yhk
for spraying into a bunker in a flame thrower role that should be ok though looking at it.
WW2 Weapons AGM Sten, AGM MP40
i think the biggest problem would be the air supply, this must take a huge volume of high pressure air to keep it going.making it portable .... well it would be just as hard work to carry as a real flame thrower.
armoury
m1a1 Thompson,sten mk2,mp40,stg44,sterling,mk2 bren gun,lee Enfield no4 mk1,Mauser Kar98, Walther ppk,smith and Weston m10 and Mauser m712
Give me a big enough hammer and a place to stand and I could fix the world.
i'll kill a man in a fair fight or if i think he's going to start a fair fight or over a woman or.......
a problem shared is a problem halved ,but an advantage shared is no advantage at all
if a job's not worth doing then its certainly not worth doing well
He is indeed a member of this forum, and he also looks after the WW2 airsoft Europe website and forum and has also played WW2 airsoft games here in the UK.
Why am I thinking that you are pointing to me Chomley 
To clarify this: I am not the owner and/or maker of this flamethrower: it is owned by a French WW2 airsofter named "bill". I hoped to see the flamethrower in action in a game last year in France, but he didn't took it with him.
The reported range is 15 tot 30meters and it uses compressed air. I am not aware of how-long you can utilise it. As I haven't seen it in action yet..
Some more pictures of this monster;
And the finished product, the Flammenwerfer 41:
