Autopilots and reported distance from Take off.....

[elmattbo]

I think the storm uses a barometer and not gps to measure altitude. It's little cousin the Breeze certainly does as I'm having iffy GPS issues on my Breeze loaded raven which is still giving altitude read outs. Plus there's that little chip on the board with a hole in it. Stick some tape on it and see how RTH works then...! 😮

None of that helps you solve your issue, I know; I've actually got a bix3 with a storm in it as well and although I haven't flown it much I've had similar issues trying to get it to lock an altitude - I very rarely get the 'lock' symbol in PA and in RTH altitude seems more a function of throttle position like it is for any in trim aeroplane. I think it's to do with the servo's and I need to adjust the throws to get in-trim to equate to neutral servo movement and hopefully that will solve it. I know you can 'set zero' with the trims but I've heard it prefers a near zero servo input to work best or it takes the input as a command to break out of altitude hold.



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[BlueFlyer]

Lmao pi r squared. My bad, where did I get that from, I was referring to a square plus b squared not pi r squared.

I knew where you were coming from lol

[BlueFlyer]

I think the storm and uses a barometer and not gps to measure altitude. It's little cousin the Breeze certainly does as I'm having iffy GPS issues on my Breeze loaded raven which is still giving altitude read outs. Plus there's that little chip on the board with a hole in it. Stick some tape on it and see how RTH works then...!

a barometer can only measure the change in altitude based on the difference in pressure... the higher you go the lower the pressure. a barometer cannot tell you if you're 200ft up, it just tells you that you're higher or lower than a certain point, on that particular day at that particular time... as air pressure changes around you an uncalibrated or non calibratable barometer is less use than a chocolate teapot

older full scale aircraft have barometers but they need to be calibrated before each flight, and regularly in flight. They have to adjust for different pressures measured by the met-office in different geographical areas... you ever see the high/low pressure lines on a weather forecast?

[Billy_boy_2010]

interesting blueflyer do you calibrate your barometer before each flight then?

[elmattbo]

Actually an aircraft altimeter is a barometer calibrated for a standard atmosphere. A 1 millibar change in pressure equates to 30 feet. The calibration is pretty simple; you just twiddle the subscale to the local pressure setting which gives you the local altitude above sea-level. There is another local setting used (rarely these days) which means your altimeter will read zero on the runway. The storm basically does this, zeroing the scale when you press the reset button.


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[BlueFlyer]

interesting blueflyer do you calibrate your barometer before each flight then?

Along with what elmattbo says, when you press the button or when power is applied to the OSD it "should" calibrate to zero there and then.

But I'm not entirely convinced that these cheap chinese electronic components are as sophisticated or as accurate as a full scale aircraft's altimeter.

I used to work 12 hour shifts on "flight watch" which is basically sitting in a room listening to white noise on the listen out for aircraft comms. Every hour I would transmit a message which was sent to me by the met office. It included the QNH code for the aircraft in my AOR (Area of Responsibility). The QNH number is what pilots use to adjust their altimeters in order to have an accurate altitude reading.

[BigT]

According to MFD they measure distance to home as the ground distance as the crow flies.


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