FY41 lite RTL after 30m

[mrorange26]

Just had my first flight with my falcon evo with a fy41 lite in it but with no air flow sensor.It flew about 30 metres out and then done a rtl and i could not switch back to manual.i have the throttle plugged directly into the L9R receiver and the whole time this was happening i had throttle control but nothing else.I managed to land it.I tried a second time and it done the same.Dors anybody know why it is doing this?

[BigT]

I need to make some assumptions here, if any are wrong please say so.
On the ground  can you clearly see the mode change in the OSD when you select a change?
On boot up of the plane you have got the tx on and switches set to,MAN mode? If set by accident to any other mode before you boot up the AP this will/may cause malfunction and PID changes so make sure.
How many sats did you have prior to launch and did the AP set home, signalled by the aileron or elevator cycling?
After AP boot up wait for the unit to warm up and do the necessary calibrations in the OSD menu. Eg initialise gyro and air speed.

I am also assuming that you have purchased this from new and it has the latest firmware 1.04 and 1.22a and it is in fixed wing mode?

So assuming all of that has been done and the plane flies straight and level in manual mode and stab mode I would suggest that the geofence has been reduced to 30 meters (100 ft).  What this means is that once the model is 30 meters from home it will engage RTH and will not allow you to take control. I seem to remember that on the Fy 41 heavy it was possible to disengage RTH by cycling the switches. It may be different on the lite, you may need to wait until it goes into the home circle. As far as I can remember the only way to change the geofence is by using the GCS system. Page 30, 31 of the manual. However I would state that the default is 4000 meters so it needs checking.
Another reason could be that there is a RC range issue that is tripping FailSafe RTH, remember that it is a legal requirement to set a FailSafe if the radio equipment has the facility.
Hope this helps.
T
Ps I would fit the air speed sensor if I was you.

Edit
You wouldn't be mrorange on RC groups by any chance? If so don't bypass the ap with the ESC, just set the wiring as per the manual, I suspect that is the issue causing a Rx failure.

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[mrorange26]

I did not purchase from new it was second hand.I do t what firmware is on it.it did have 9 satellites.I checked the range on my radio by walking at least a 100 metre and it was fine.The only thing I did notice was max distance was set at 100.

[BigT]

There is only one firmware for the lite, people have tried to put the heavy firmware on the lite and it won't work. The only way to check that you have the correct fixed wing firmware is to connect the AP to the fun tech GCS program. When in GCS you can check the geofence setting. If all is correct then work through the he connections and don't by pass the AP. Then work through the snagging set up as above and then the first flight program as listed in the manual. Make double double sure you don't have a FailSafe set in your Rx. A simple check is to take the prop off the model, boot up tx with switches set to null man, then Rx, Initialise gyro,  get sat lock, look at OSD and observe mode which should be man. Turn off tx, mode should change to RTH, turn tx back on and you may need to cycle the mode switch to get back to man. I am not familiar with fr Sky radio as I only fly Futaba 14 sg, on that system I would need to cycle the mode and ensure the throttle was closed before the tx would transmit.

In RTH mode the AP will control the throttle until circle mode.

I repeat, when you connect to GCS if the geofence is still at the default setting then it points to a radio FailSafe.



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[BigT]

The only thing I did notice was max distance was set at 100.

Where did you see the max distance? If that is in the osd then that is the geofence distance. Try changing it to 1000.

[mrorange26]

In the osd when I went into settings

[markwilliams]

Would that be 100 foot?

100 foot = about 30M.

Mark.

[mrorange26]

I don't know now if it's feet or metres

[BigT]

I am pretty sure that all the settings in FY are in metric. Unlike the MFD AP I dont think they can be changed to imperial, so that would be 100 meters, about 330 feet.

EDIT
Just checked on GCS, its metric with no facility for changing to imperial.

[mrorange26]

I wasn't a 100 metres out when it happened not unless it got confused but I did have 9 satellite lock.

[BigT]

Until you work through the lists I posted earlier its guess work.

[mrorange26]

Ok I will check firmware when I get home and other bits

[BigT]

Another thing that doesnt seem correct. The lite has a rtl protection in that if it is activated below 50 meters the model will climb to 50 meters before rtl. So as you are saying that rtl engaged at 30 meters what was the height of the model? Did it climb to 50 meters before rtl or descend to 50 meters when it hit home. 30 meters is not very far. For example a 38 tonne artic is 18.75 meters long or 60 foot. 100 meters = 5 trucks.
My money is on a rx failsafe.

[mrorange26]

It did start to climb and circle.i tried the range on the radio gear.i went at least 100 metres away it was fine.the model was only 10 to 20 metres high

[BigT]

Then if all other checks are OK and exactly in accordance with the manual as a test I would re set the geofence to 300 and try a test flight. Everytime you make a change either with the OSD menu or with GCS make sure you save before exiting.
Make sure you have the 3 way switches set to Nul and Man on the tx before switching on and then power up the model.  Also remember that with the FY41 AP, first flight of the session you must let the AP warm up then INI Gyro and INI Airspeed if sensor fitted, before committing flight.