Adrian

Post-processing data offboard is almost certainly a non-starter for most flyers.I think 10% accuracy and a successful deployment is fine for most flyers. But if you’re filling out a record form to Tripoli, then A) you’re already not “most flyers”…   Read more»

I hate to keep disagreeing, but hopefully I can do it without being disagreeable:Measuring delta-pressure with 1%-2% accuracy is very do-able with today’s altimeters without any price increase.A 0.5% accuracy pressure reference gauge with a calibration to a 0.025% NIST-traceable…   Read more»

But if I fly a rocket against someone else’s – and it’s for any kind of contest, club record, or Tripoli record – I want if to be an apples-to-apples comparison. It seems to me that a shorter, smaller diameter…   Read more»

The baro sensor sensor would put out good data, but it wouldn’t get recorded because the Parrot uses the accel to detect the launch. Either end up is fine (new feature) but sideways wouldn’t work. How many Gs are you…   Read more»

The Rocketry Planet article claimed that only the G-Whizz unit is OK over 34K MSL. What about the Missile Works and PefectFlite high altitude products? Jim claims 40K, and PF claims 45K. Adrian, I understand your unit is also OK…   Read more»

It’s a tough call, but Curt goofed. Now if he brought calibration data that showed that particular baro altimeter has good data at those altitudes and I were Tripoli’s contest director, I would accept it. I agree that since the…   Read more»

Isn’t there a way to adjust the SAM for ambient temperature? I would be very surprised if there weren’t.Yes, that’s what I was proposing in method #1 for the post-flight adjustment. Denverdoc found a great website for more info//mtp.jpl.nasa.gov/notes/altitu…udeScales.htmlI’m hoping…   Read more»

Hold on there Adrian. You sure that wasn’t something else that was harvested and tossed over the fence into your Aero Garden???LOL. If they did, they broke into our kitchen. 🙂 The AeroGarden is a setup for your kitchen countertop….   Read more»

I’ve missed a bunch of threads and pardon me if you’ve answered this already – but is the key element of difference in the temperature compenstion based on the US SAM -6.5c/KM assumed temperature difference in the first 10 Km…   Read more»

By the way, the Tripoli record form does ask for ambient air temperature and pad altitude, so if they have that data from every record, then they could correct all of them, at least assuming that the temperature is just…   Read more»

The Parrot does measure chip temperature along with every pressure measurement, but I don’t recommend that for this purpose because the temperature of the board can be way off from ambient. In Chris’s Cirrus Dart last summer if I recall…   Read more»

When life hands you lemons, make lemonade. And when your wife hands you a sandwich baggie full of mint harvested from an overgrown AeroGarden, made mojitos. But don’t expect to be able to write clearly on a techical topic afterwards….   Read more»

Good to know. Somone should probably remove the 7/13 launch from the launch schedule on the web site.

Wow, Art, that is one impressive bird, and very well documented. I’ll be coming back to study this some more to learn how to do a big project right. I can’t wait to see the film.

I’m almost afraid to ask, but how much does a K250 cost? I’ve still got quite a few rockets to build and fly before then, but someday I might like to go for the K record.

Are your cells bare, or do they have cell protection circuitry built in? If they have the protection circuits, you would need to watch out for the protection circuits cutting off the current and starving the Hi-alt’s power supply when…   Read more»

The Parrot uses a single (3.8V) 70 mAhr cell that is semi-permanently affixed to the altimeter. The USB interface for the Parrot charges it whenever it’s plugged in.The deployments require a separate user-supplied battery. For that job I use a…   Read more»

Good news, thanks.

John,When I get home I will, though you would have to upgrade to Rocksim 8 to read it.Your responses on the heating are encouraging. I looked up cotronics, and they have an epoxy that looks good, with low viscosity, 10kpsi…   Read more»

I just did a sim. Yeesh. Over 100 Gs for a full second, and a top speed of about 2300 mph, assuming the fins stay on. There would be 80 lbs of drag, of which 20 lbs would be on…   Read more»