My experience with RSCB's tells me that moist or damp darts do not like to slide - even through a straight tube. (my group recently had a nerf war during a rain storm). The thread is moving away from lung power to transition darts, and I think a fail has been avoided there. The humidity that blowing in the tube would of transferred would probably of impacted dart movement after a few hours of nerfing and advancing darts down the tube.
I haven't experienced any jamming because of the humidity issue so far, and I've had darts start to get damp. I suspect this is because the tube ID is significantly larger than the darts OD - in an RSCB they're usually somewhat close. I suppose I could hose the tube and darts down to check though.
I did have one jam, but I think that was due to my forcing darts in without blowing them out of the way. Good gravy though, clearing that was a bear. Recommended equipment will be a coil of household wire equal to the length of the tube you're using - unfortunately the wire I had on hand was only 7' long and I had to uncoil the tube and drop a stick of CPVC down there too. The jamb was from two darts overlapped.
As far as pumps go, you can easily source a battery powered air blower by looking near the air mattresses. I've got one, it takes 4 "D" batteries so it's stupid heavy but it puts out more air than a computer fan. A little modding to a lipo would cut down on the weight and seriously increase the output.
Tried one exactly like that (branded ozark trail or something), no dice.
Edit: Update: I've picked up a longer section of tubing. I couldn't get 100' to feed by manpower alone, so I tried to use my shop vac. It didn't seem to want to feed the whole stack either, (
I may have a jam in there somewhere; I'll break the pipe up into 30' and 60' sections and see if it works Broke it into sections, no jam in either; just too much power required for me to overcome), but when I went to reverse it 103 darts came out that I'd loaded by manpower, so it'll work with at least 100. That's probably ok, I don't think you'd want to carry the 100' coil except on your back and it'd need a massive blower if my shop vac didn't want to clear it.
I've also found a 3/4" blue ENT adapter -> 3/4" male threaded PVC adapter and a 3/4" female threaded PVC to 1/2" PVC socket, so that part was easy.
Edit 2: Tried short darts, they seem to work fine but I'd be nervous going less than 1.25" - I tried 1" and it worked but I'm afraid they could tumble in the tubing.
Edited by Meaker VI, 16 May 2017 - 02:40 PM.