MFD Autopilot

[Coyote]

When you bank the plane, is the line being displayed matching the ground level in front of the plane ?

[djhandz]

When you bank the plane, is the line being displayed matching the ground level in front of the plane ?

Thanks am not sure i understand what you mean. If i bank right the line is like this / and vise versa

[Coyote]

No matter which way you bank, the line shows you where the horizon is, that's the point of it, an artificial horizon.

For example :



The plane in this picture is banking to the right, so the horizon in the picture drops at the left and raises at the right hand side, you can see the artificial horizon in the picture tries to match this so if you can not see the real horizon you still know where it is.

[djhandz]

Oh right i get it now i always used it the other way round well when i say always i am talking video games lol..thanks for explaining that to me

[BigT]

Oh right i get it now i always used it the other way round well when i say always i am talking video games lol..thanks for explaining that to me

Doesn't matter what format, games, OSD, real life flying, compass on a gimbal, the artificial horizon mimics the real horizon. Imagine it's dark and you are on instruments.  Don't get confused with the little tell tale outline of the plane on some OSD

[djhandz]

Lovin this unit.. ok was messing with circle mode today but my turning circle was huge it was like 250 meters and i have the setting on the lowest setting off the top of my head cant remember exact number but something like 60 or 70. Any tips on getting my circle tighter?. And also i like to cruise around alt/cruise mode is it ok to set min throttle at 0  if not what is a good setting. This is on a bix3 thanks guys

[Coyote]

Wind will impact your circling a lot, failing that its playing with the PID's and mainly the P value for cruise.

You can set throttle for 0 but it is advised to set it for your minimum throttle to maintain its cruise speed.

[djhandz]

Thankyou yes it was quite windy i will have a play about next time out. Just got in to this fpv business i reaĺly like it ant had my helis out for a while need get em out so i dont loose the skills. Flying helis taught me how to fly a plane lol  :D

[BigT]

Is your read out metric or imperial? Your circle setting is radius not diameter. 70 meters radius  is a big circle for a small plane like the Bixler. As Ian says wind will have a factor and if you are using the ass and it is not calibrated correctly it will be fighting the head wind so take time and calibrate the ass. In a dead calm mine is within 2kph of the GPS. Re speed, after calibration you will be able to,set the min cruise speed used for RTH etc but take care not to set it too low as it could induce a downwind stall in a RTH situation. Again it's a matter of knowing your planes flight envelope. Another tip, if for any reason you change any of the flight trims either on purpose or by accident always cal joystick.


Sent from my iPad using Tapatalk

[djhandz]

Thanks bigt whats the best way to calibrate the air speed sensor ?

[bignose13]

Go into menu then look for sensors, you'll find cal air speed sensor there, make sure the wind doesn't affect the reading while calibrating otherwise your wasting your time

[AdamG]

I need to tap into one of the GPS cables and add a Y connector so that I can supply GPS data to my Dragonlink Rx. Cab anyone tell me which of the GPS cables is it that i need to tap into? I know it will be either the yellow or the white.  (?)

[BigT]

Thanks bigt whats the best way to calibrate the air speed sensor ?

This is how I did it :

Choose a day or time to fly when there is very little wind. Allow the AP to warm up for about 5 mins, carry out normal pre flight calibrations.
Take off and fly straight and level up wind noting the GPS speed and Indicated Airspeed.

Fly downwind at the same GPS speed and note airspeed. If the wind is light or none existent the airspeed and GPS speed should be near enough the same.

What you do now is land and adjust the figure in the cal airspeed menu to compensate for the wind speed. If you know the wind speed either by an anemometer or a fellow flier with a pre calibrated asi you can use those figures.

Then fly and test again. When calibrated you should get very accurate upwind downwind readings. The acid  test is to do a series of stall tests down wind to check for zero zero readings. But practice stall recovery los first. The mfd has a very benign stall unlike the big skywalkers.

One thing to be very careful of. I find that a big change in ambient temperature has the effect of changing the static reading on the asi. For example I flew in minus temp conditions, carrying out the usual cal asi before the flight. I then stored the model in my heated workshop. A few weeks later I powered up the model to do a pre flight check on video before leaving home and without the tx on and it immediately went to RTH full throttle. Luckily I had the props off. I traced the issue to a static indicated air speed of 28 mph which had bi passed the throttle safety as the AP thought it was going fast enough to trigger signal loss RTH, the remedy is to ensure the tx is on and airspeed is cal.

[Coyote]

I need to tap into one of the GPS cables and add a Y connector so that I can supply GPS data to my Dragonlink Rx. Cab anyone tell me which of the GPS cables is it that i need to tap into? I know it will be either the yellow or the white.  (?)

I don't know but the one that has Tx printed near it will be the right one.

[AdamG]

Thanks Ian.

Out of interest, why does it have a tx and rx? I thought there was only 1 way comms between an AP and the GPS puck and that was the AP receiving data from the GPS.