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-   -   Altimeter question (I've never used one) (http://www.bikeforums.net/general-cycling-discussion/161376-altimeter-question-ive-never-used-one.html)

RB1-luvr 12-21-05 02:27 PM

Altimeter question (I've never used one)
 
hey folks,
I'm thinking of throwing a bicycle computer with altimeter function in the payload section of a model rocket to record how high my flights are. Two questions:

1. will the altimeter work without a wheel sensor starting things off? In other words does that function work if you just carry it around?

2. does the max altitude get recorded for viewing later?

cheers,
Ian

operator 12-21-05 02:36 PM

Your entire flight height probably falls within the error of the altimeter.

free_pizza 12-21-05 02:43 PM

Quote:

Originally Posted by RB1-luvr
hey folks,
I'm thinking of throwing a bicycle computer with altimeter function in the payload section of a model rocket to record how high my flights are. Two questions:

1. will the altimeter work without a wheel sensor starting things off? In other words does that function work if you just carry it around?

2. does the max altitude get recorded for viewing later?

cheers,
Ian

you should tie 50 huge spools of thread together and tie it to the rocket :D :D :D
it may not be as crazy as it sounds ;)

RB1-luvr 01-17-06 01:08 PM

Quote:

Originally Posted by operator
Your entire flight height probably falls within the error of the altimeter.


are you serious? my flights are about 750-1,000 ft.

richardmasoner 01-17-06 03:27 PM

Quote:

Originally Posted by RB1-luvr
hey folks,
I'm thinking of throwing a bicycle computer with altimeter function in the payload section of a model rocket to record how high my flights are.

Use an altimeter designed for model rocketry. I think I paid about $10 for mine. You zero the thing on the ground and the shock of parachute release tells it to remember and display the release altitude. It works very well.

You can pay $100 for fancy ones that will record the entire flight.

A bike computer is accurate enough to measure 700 foot flights, but the ones I'm familiar with only look at the altitude once every few seconds. That won't work for a rocket flight.

SanDiegoSteve 01-17-06 04:51 PM

I've got a Polar 720i, and I think it would work, but the polling inerval has a minimum of 5 seconds. Would it even get a reading.

Do some telemetry. Measure a distance back and then sight it to get an angle. Can then calculate the hight pretty cloesly (at least for basic backyard fun).

Albany-12303 01-18-06 03:18 PM

Dress your altimeter up like an astronaut and pretend to feed it tang!

RB1-luvr 01-25-06 10:31 AM

Quote:

Originally Posted by CrimsonEclipse
750-1200?

3 words

G Class Engine

We'll have you makin' sonic booms in no time!

CE

ha hah!!! i know man, i'll get to the g class engines someday. for now i'm new at it and putzin with C class engines and scratch built rockets. it started just as a way to fulfill a missed childhood hobby. i do have my eyes on some g/h/i engine rocket kits. maybe by the end of '06 i'll try one.

thanks for all your replies.


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