Well that was easy and it’s Bloodhound approved!
I wanted to try to see how hard it was to make my own blast gates. Pretty simple actually. I did spend some time to make certain that everything was a good fit but it still went pretty fast. This is a “through” gate meaning that the slide can be pulled from either side.
I cut two holes in a piece of 1/2” ply. One just big enough for a 4” S&D coupling and the other for 3” DWV coupling. The slide is made from 3/16 tempered hardboard that I covered both sides with a liberal coating of paraffin. The “spacers” are 1/4” hardboard that I used my hand plane to reduce their thickness a little. Poly Glue to affix the coupling to the ply and PVA for everything else. I did shoot a couple pin nails just because I was too lazy to mess with clamps.
The 3” coupling turned out to be just a little big to slide the hose over. I remember hose sliding over 3”. Maybe I need to sneak out to the hardware store and pick up a short of 3” DWV pipe and see if that works a little better.
I did cut the 4” Coupling in two so that I could make 2 blast gates from one coupling. I had intended to the same with the 3”, but since the hose is a tight fit, I just left it as is.
The good news, no leaks! so I have something that I can work with here.
A stop would nice but I’m willing to sacrifice a stop for a leak free gate.
A handle. Since this was just a test, I didn’t bother with a handle. Easy enough to toss one on it but it’s not hard to get a hold of the way that it is now.
-- Chunk's Workshop pictures: http://spadfest.rcspads.com/thumbnails.php?album=135