Yeah, I almost shredded "Impending Doom" on it's first flight because I never stopped to think that a little cardboard rocket thrown together one afternoon for fun would exceed mach. Luckily it appears to have gone .99 Mach or something - def made 1100 fps, but no Mach transition pressure increase which would have caused early deployment. In retrospect, you can't ever go wrong setting the mach delay equal to or just longer than the motor burn time. I think I'll just do that from now on.It went transonic on a Cesaroni J285 (I think). It simmed much slower so I didn't set the delay, something which I do now for most all flights.
That's a mess? You're kidding right? You should come over to my place sometime.Sorry for the mess in the basement, I just moved in and haven't yet gotten everything cleaned up.
Sure, no problem. It's Dave Logan's pad design:
The insrtucitons call for a 4' rail but I mounted a 6' rail instead. It's pretty stable.
The blast deflector is attached using two 1/4" carriage bolts.
Sorry for the mess in the basement, I just moved in and haven't yet gotten everything cleaned up.
In an earlier thread, Tim asked about getting a pad, and I suggested that he take a look at a scratch-built pad design that was posted on EMRR. I had used that article to build my own rail pad in 2006. (My version has an 8' rail, and I discussed the modifications that I needed to make to the pad's design to accommodate it in a "Guest's Opinion" at the end of the article.) Your design does look quite similar to the pad in the EMRR article. I joined TRF 1.0 in late 2006 but I didn't start to actively participate in the forum until early 2008. I was not aware of your thread until you mentioned it in your post above.
I can respect that. I just think that KISS is really an engineering term. I don't think KISS should apply to goals, only the building/operating/engineering and technical means to achieve those goals.handyeman, I decided not to go for DD in my cert. attempt... I believe in KISS and figured it wouldn't be hard to send 'er up to 1,200 feet and retrieve. That makes the odds more in my favor of getting my certification.