ALTIMITER READING ON MY TYPHOON H

[KEITH KUHN]

HELLO EVERYONE
DOES ANYONE HAVE A CLUE WHY THE ALTIMETER
READING ON THE TYPHOON H CAN BE OFF BY 15 FEET
AT TIMES.
EXAMPLE = I WAS HOVERING AT 2.5 TO 3 FT.
MY CONTROLLER SAYS 12 TO 15 FEET.
ALSO LOSING DATA ON ST16 SCREEN AT
600 FEET OUT 200 FEET HIGH = NO OBSTRUCTIONS.
HMMMM BAFFLES ME
THANKS
KEITH K

 

[John Hennessy]

HI KEITH, THE ALTIMETER IS A BAROMETER NEXT TO THE GPS UNIT AND LIKE ALL BAROMETERS THEY WORK ON AIR PRESURE. IF YOU HAVE A HIGH OR A LOW COMING INTO YOUR AREA OF FLIGHTS THE BAROMETER SHALL REGISTER ACCORDINGLY. IF YOU FLY IN THE SUN FOR A WHILE THEN GO INTO THE SHADE OR HAVE A GUST OF FRESH BREEZE COME IN , THAT WILL ALTER YOUR HT READING ON YOUR SCREEN,BECAUSE YOUR H IS NOT CONTROLED IN HEIGHT BY A GPS YOU WILL HAVE THIS DIFFERENCE AND ALSO THE MOVEMENT OF THE H UP AND DOWN A COUPLE OF FEET OR MORE. UNTIL THEY GET A THREE SPHERE GPS IN OUR DRONES WE WILL NOT HAVE STABLE OR ACCURATE HEIGHT READINGS . THE H IS QUITE GOOD FOR STABILITY ON THE HORIZONTAL PLANE AS THAT IS FIXED BY TWO OR THREE SATELITES POSITIONS BUT TO GET ACCURATE VERTICAL MEASUREMENTS YOU NEED ANOTHER FIXED BASE STATION ON THE GROUND OR A SYSTEM THAT DARIO WAS WORKING ON LAST YEAR. I HOPE THAT THIS ANSWERS YOUR QUESTION WITHOUT BRINGING MORE FOR YOU TO CONTEMPLATE. I THINK WHAT I SAID WAS CORRECT, IF NOT I SHALL BE CORRECTED SOON. JOHNNO HENNESSY . KEEP FLYING ON THE GREEN SIDE OF THE GRASS.

 

[KEITH KUHN]

HI KEITH, THE ALTIMETER IS A BAROMETER NEXT TO THE GPS UNIT AND LIKE ALL BAROMETERS THEY WORK ON AIR PRESURE. IF YOU HAVE A HIGH OR A LOW COMING INTO YOUR AREA OF FLIGHTS THE BAROMETER SHALL REGISTER ACCORDINGLY. IF YOU FLY IN THE SUN FOR A WHILE THEN GO INTO THE SHADE OR HAVE A GUST OF FRESH BREEZE COME IN , THAT WILL ALTER YOUR HT READING ON YOUR SCREEN,BECAUSE YOUR H IS NOT CONTROLED IN HEIGHT BY A GPS YOU WILL HAVE THIS DIFFERENCE AND ALSO THE MOVEMENT OF THE H UP AND DOWN A COUPLE OF FEET OR MORE. UNTIL THEY GET A THREE SPHERE GPS IN OUR DRONES WE WILL NOT HAVE STABLE OR ACCURATE HEIGHT READINGS . THE H IS QUITE GOOD FOR STABILITY ON THE HORIZONTAL PLANE AS THAT IS FIXED BY TWO OR THREE SATELITES POSITIONS BUT TO GET ACCURATE VERTICAL MEASUREMENTS YOU NEED ANOTHER FIXED BASE STATION ON THE GROUND OR A SYSTEM THAT DARIO WAS WORKING ON LAST YEAR. I HOPE THAT THIS ANSWERS YOUR QUESTION WITHOUT BRINGING MORE FOR YOU TO CONTEMPLATE. I THINK WHAT I SAID WAS CORRECT, IF NOT I SHALL BE CORRECTED SOON. JOHNNO HENNESSY . KEEP FLYING ON THE GREEN SIDE OF THE GRASS.

THANKS SO MUCH.
I LIKE THE WAY YOU EXPLAINED IT.
I ALWAYS TRY TO FLY 20 TO 30 FEET HIGHER
WHEN GOING OVER AN OBJECT FOR SAFE KEEPING.
THANKS AGAIN
KEITH KUHN

 

[Steve Carr]

THE H IS QUITE GOOD FOR STABILITY ON THE HORIZONTAL PLANE AS THAT IS FIXED BY TWO OR THREE SATELITES POSITIONS

The H uses the barometric sensor and the accelerometers for the altitude reading. GPS altitudes are much less accurate and are not used. The altitude reading will vary when the inside temp of the H changes. After flying for 15 minutes the reading may be off by 3-5 meters. It should not affect the flight behavior.

 

[ThunderChicken]

I just love these inaccurate altitude measuring devices! 400 ft limit? Hah! How would they prove it? From the internal readings from a device that won't hold a calibration for a day? Even real aircraft when you are at the air port you have to dial in the airport mean sea level before you taxi out, every time. Air temperature plays a big part in those indications, One day I had just dialed the altimeter in and had to shut down and go back in to complete some paperwork. By the time I got back the altimeter was off by 10 feet after only six hours. Dialed in at 2:58 P.M. and at 9:10 P.M. it was off by 10 feet.
The ones in our typhoon H's is a variable resistor type and they can be noisy. I worked in a calibration lab and electronic pressure indicators were the worst. We had a Mercury column in a temperature controlled cabinet and we had to verify certain items were accurate.

 

[PatR]

Experience overseas established that GPS altimeters were often off by several hundred feet when compared with full scale altimeters set to field elevation. The baro altimeters used in multirotors are not anywhere close to being as sophisticated or accurate as full scale altimeters. Personally I would be surprised to find a basic multirotor altimeter to read within 100’ of it’s actual altitude.

Some think we pay a lot of money for our toys and expect them to be precise in their measurements. In truth they are not expensive and don’t even come close to equaling the price of a decent full scale altimeter before installation. How we view the cost of our stuff is pretty much relative to how much money each has. A grand to someone with a lot of money is no big deal. To someone with much less money it is a lot. In the world of precision avionics a grand is not much at all. A decent two axis auto pilot starts at 20 times that.

 

[KEITH KUHN]

Experience overseas established that GPS altimeters were often off by several hundred feet when compared with full scale altimeters set to field elevation. The baro altimeters used in multirotors are not anywhere close to being as sophisticated or accurate as full scale altimeters. Personally I would be surprised to find a basic multirotor altimeter to read within 100’ of it’s actual altitude.

Some think we pay a lot of money for our toys and expect them to be precise in their measurements. In truth they are not expensive and don’t even come close to equaling the price of a decent full scale altimeter before installation. How we view the cost of our stuff is pretty much relative to how much money each has. A grand to someone with a lot of money is no big deal. To someone with much less money it is a lot. In the world of precision avionics a grand is not much at all. A decent two axis auto pilot starts at 20 times that.

Wow a couple hundred feet. That is quite a variation . I guess line of site is best if you don't want to have any accidents.
Keith Kuhn