- This topic has 4 replies, 3 voices, and was last updated 16 years ago by
Doug Gerrard.
Doug Gerrard.-
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Steve Jensen
as it is small and supposedly idiot proof, which may help me or not…
I’ve heard numerous comments about the “error” of barometric altimeters. Any helpful hints or suggestions?
I am placing one in the nosecone (at the base 20 inches from the tip) of my Level 2 Cert Rocket for fun — GLR Liberty 4. It looks too simple.
What am I missing?
Doug Gerrard
I’ve heard numerous comments about the “error” of barometric altimeters. Any helpful hints or suggestions?
Go to an accelerometer based unit 🙂 Kidding aside, “error” is misleading. They are likely more accurate than acceleration based units but they must actually be falling to detect apogee. So they tend to pop the laundry slightly after apogee. Acceleration based units integrate the acceleration (twice) during the flight. They actually deploy slightly ahead of apogee. Personally I like to use both, the acceleration based unit for primary and a barometric based unit as a back-up.
Doug
Steve Jensen
This unit is an altimeter only. No ability to set off anything.
Who makes a good accelerometer based altimeter/charge capable unit?
Adrian
This unit is an altimeter only. No ability to set off anything.
Who makes a good accelerometer based altimeter/charge capable unit?
(Raises hand) 😀
Doug Gerrard
Who makes a good accelerometer based altimeter/charge capable unit?
I like the G-Wiz HCX or the LCX. The LCX is less expensive and only records the max altitude, velocity, etc. The HCX is a complete recorder including a user input. You could create a simple circuit with a photo-resistor and measure the rockets roll rate, a pressure sensor to measure motor pressure. Well you could, I wouldn’t. But you get the idea. Its capable of recording up to 500 samples a second.
Doug
Steve Jensen
Doug Gerrard
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