Well-Known MemberTRF Supporter
- Jan 18, 2009
- Reaction score
- Stafford, VA
I think the JLCR has a lower success rate than standard DD, but not because of the device. It's pretty easy to pack a parachute in a tube and have it deploy correctly, we've been doing this since our first Estes rocket. It is more difficult to fold a chute in a way the JLCR holds it during decent and it opens correctly when the JLCR releases. There are also many other subtle things that can be done wrong causing the chute to open at apogee, or not open at all, among other failure modes.FWIW I asked one of the club officers for what they feel the failure rate is based on his experience and he answered a shockingly high number and I didn't think he was joking.
I was asking for a baseline since I wanted to use it more this season.
Of note is that I have 3 and one of them I have to send in for repair. It was the one I grabbed the night before our first launch and in testing, the pin was pulling out by itself (wasn't holding securely). I saw that the retaining bolt in the device wasn't extending out enough. This was a new surprise to me and good thing I was testing it before use.
However, in my past experience Jolly Logic has had fantastic support and servicing... top notch.
I think the electronics in the JLCR are just as reliable as DD altimeters. The mechanical operations of the device I'm sure reduce that reliability somewhat. The user operation reduces the success rate of the JLCR much more than anything in the device. I think as the community learns what works and what doesn't when using the JLCR the overall success rate will increase significantly.
I only use my JLCR on two rockets, but my success rate is near 100% since I've figure out how to use it on those two.