Alrighty! I added a relay & another timer. On the bench.... it works! The second timer is set for a longer time than the first so after the first one shuts off it does not recieve backfeeding power. Yippeee! Maybe in the next day or two I'll find time to hook it up & give it the acid test.
Now, once it's working mechanically and electrically, what about real world testing? I've been giving thought to seeing how close I can come to burning my eyebrows. I don't know if I'll have the guts to try, but have had this thought of inducing propane in through the 5/8" hole and forcing a (small) puff back. Once I get so I can make a small one each time, then try it using the anti-puff back device. Then.... oh yes... add more propane and do testing to calcualte if ten seconds is long enough to purge explosive gasses. With these timers it'd be easy to make it a 20, 30, 60 second purge. Ohhh, this is getting exciting!
I was talking to Charlie, my AHS buddy, after he expressed how powerful the Booms are. I said "Maybe they actually aren't powerful, maybe the mixture is sickly rich and even though they blow the dampers apart, maybe they are only producing at 10% of capacity. Maybe once we add 10 seconds of anti-boom air, the mixture will be proper for a really BIG boom!" He said "And we'll be finding the view port door 3" into the concrete wall?".