I'll be sitting this one out, only my Go Devil 38 is <3.3 lbs and I don't have any motors that qualify. So I'll take the long weekend to build and look forward to next weekend's TCC launch. Looks like it should be a nice day though, have fun!
December 13th?? I'll be there. But where is this 80N limit coming from? We should start calling them "Class 1" or "Class 2" launches. There appear to be several H motors that fall into "Class 1" FAR 101
The following definitions apply to this subpart:
(a) Class 1Model Rocket means an amateur rocket that:
(1) Uses no more than 125 grams (4.4 ounces) of propellant;
(2) Uses a slow-burning propellant;
(3) Is made of paper, wood, or breakable plastic;
(4) Contains no substantial metal parts; and
(5) Weighs no more than 1,500 grams (53 ounces), including the propellant.
(b) Class 2High-Power Rocket means an amateur rocket other than a model rocket that is propelled by a motor or motors having a combined total impulse of 40,960 Newton-seconds (9,208 pound-seconds) or less.
(c) Class 3Advanced High-Power Rocket means an amateur rocket other than a model rocket or high-power rocket.
Very nice launch today, nice to see so many folks out there. Sometimes it's nice to go out and just fly, no high power flight stress. Flew the heck out of an ACME Spitfire C11, D12, swmbo vetoed the E18w) and a Skypyrates Punisher with an Eggfinder mini on an F52 for its first flight.
That inverted spike at apogee (and another little one at main deployment) is likely a leak of ejection charge pressure into your avbay. That momentary increase in pressure looks to the altimeter like a drop in altitude.
Since velocity is just a calculated result using the altitude data over time, an error in one produces an error in the other.
Take a close look at the avbay bulkheads and their fit, and any holes through which you pass wire or hardware, and seal it up. Fun-tack or sticky-tack, the sticky putty used to put posters on the wall is a good temporary seal around wires and bulkhead holes that you can't permanently seal by other means (epoxy, RTV, etc.).