Zuke, thank you, very interesting! Yes, that's correct - we tested 3 iphone 4s and each of them behaved differently! But even the $ 600 Levil did not convince me, although it is ok. I have yet to try the D1!
Alexisvc....Zuke here....no I am certainly not smart enough to be the developer...I was just one of the first users of the program and I helped the developer every way I could as I could see the potential. That is why I put those short video clips on you tube under pocket horizon attitude indicator...there are about seven short clips taken from my experimental aircraft longeze. I tried that other program that is shown from the earlier panel pic. I think his name is bbflight. That program performed horribly in the air.it has more features than PH but fails miserably as an attitude indicator.
All the credit for the pocket horizon program goes to Ted cannady over at logical drive. He succeeded where others failed. It is not a slam dunk...ie.....perfect program but it does work well if set up correctly....he even has a section where you fine tune it....put in stall speed,weight wing area and other variables. The only drawback is it does not work of pitot static....he only has ground speed.
You should read his POH on his site....it will answer all questions of setup.
Biggest problem with this technology is vibration but the longeze has engine in back so insteument panel does not have as much vibration as other airplanes. Zuke
So clearly they have put in gravity sensing in there; not just acceleration
Huh? Gravity is just acceleration. Any MEMS 3D acceleration sensor will read 1g on the down axis if otherwise unaccelerated. You cannot distinguish gravity from other acceleration sources without additional input. Maybe that's what Garmin is trying to do with ASI and GPS input; but then I don't understand why this isn't strictly optional.
Yes, but presumably transient acceleration is easier to measure than the constant 1g down, because with the former you don't need to worry about temperature and other drift factors.
It would be interesting to find some background to the certification requirements.
I think that the MEMS Gyro chip measures rotation from a plane, not acceleration, and combines that data with data from the accelerometer. Is that wrong?
The gyros on model helicopters are only for stabilisation. Even with them, a model won't fly hands off for more than a few seconds. It's true that model helicopters can have high levels of vibration , but it tends to be at a higher frequency than for full-size aircraft which makes it easier to dampen, though it can still be an issue. The cheap gyros have a bad reputation - the last one I bought (admittedly a few years back) cost > £200.
There are autopilots with auto-leveling but they normally have other inputs e.g. infra-red horizon detection and GPS.
Yes, but presumably transient acceleration is easier to measure than the constant 1g down
That seems to be the least of the problems. Acceleration sensors I've seen have low enough bias and the scaling is irrelevant since only the direction (and not its length) of the acceleration vector is used.
I think that the MEMS Gyro chip measures rotation from a plane, not acceleration, and combines that data with data from the accelerometer. Is that wrong?
MEMS means "Micro Electro Mechanical Systems", and this technology can be used to build different sensors, such as gyroscopes, linear acceleration sensors, pressure sensors, microphones... ST Micro and Analog Devices are two manufacturers of MEMS devices with a large portfolio of devices
Zuke here...pocket horizon pro has a switch in the program for the pilot to remove the gyro from the equation if it is misbehaving. Then the program runs strictly off gps. It is accurate but delayed as for the insteument to react to attitude changes requires a change in track...this takes time....so it is a delayed response. I like instantaneous results ....I think all pilots want that.
Does anyone know the best way to remove vibration from the instrument panel which transmits to the pod or pad or phone? I have tries soft foam backing,rubber grommets and Velcro . The results are dubious.
If I can figure out how to send picture to site I will to show how it is mounted.
Lastly.....the part number for the specific gyros vary between the pad...pod....and phone. Some are ad3..,ad4....ad8 in the pad. I don't know if there is any real difference but I do know calling apple tech support is a waste of time. Generally, I have found that the ipad gyro yield better accuracy than the pod but I don't know if that is just because it is a more massive body compared to the tiny ipod or if it is because I use a ram mount....suction cup....for the pad and the pod is directly mounted on the panel.
I have a friend that just bought a dynon d1.....what I want to do is Velcro it to the instrument panel next to the pod with pocket horizon.....then go fly.....and do a fly off and record with my video camera...then put on you tube.
MEMS means "Micro Electro Mechanical Systems", and this technology can be used to build different sensors, such as gyroscopes
That's why i wrote MEMS Gyro chip :-)
If I can figure out how to send picture to site I will to show how it is mounted.
See Posting Tips, above the text entry box. Imgur.com is one easy site.
