Speaking of the Clapper: when I started to use my ski ramp this year, I was all caught up in engineering some sort of release that would hold the plane back once I slowly eased down it to the runway proper. A winch was to be used for a controlled descent down the ramp, with me out of the plane running the winch. The idea I had was something that would secure the plane (for sure, as the slope is such that it would be the end of HONEY if it got away from me), a sailplane tow hook release was too expensive, too heavy, and too simple. In the best spirit of re-inventing the wheel, I came up with a 300 watt soldering iron with a blade in place of the regular tip. Extensive testing (done in my heated shop, a major engineering error) showed this would consistantly burn through 1/2" poly rope in 3 minutes, plus or minus 15 seconds. So, once activated, I could count on enough time to get in and ready to go.
The Clapper came to mind, I could turn off the warmed up engine, clap, activate the thermal releaser (I had to think up a name for it), and a few minutes later punch off leaving all the other stuff on the ground. First time I tried it, the prop blast of the idling engine blew the device out of position. Then I weighted it down some more, the prop blast didn't move it but it greatly extended the time needed to burn through the rope, plus now the device was squarely in the way when I blasted back up the ramp. That's how I decided to just punch it from the top of the ramp, after I widened it and installed the Poly Max plastic over the steel, so it'd be slick no matter what. Simple solution now, but the first time headed down it was a rush, but after a couple dozen descents (and the harder to master ascent) this winter it worked great. Next project is to crane it out off my front yard behind an outbuilding for the summer, piece of cake there, I'll post a picture of that. I got 55 hrs of ski flying in this winter so ! guess it worked out!