FY41AP Geofence / Frsky L9R

[MarkLloyd]

Went out this morn to try out the new FRsky L9R long range rx .  Everything was great but I'd forgotten I'd set my  FY41 geofence to 2850m when I got it months ago.  I've never been out this far before and set it to that range just incase my zephyr ever decided to bugger off on it's own.

Well the L9R was more than happy out to that range and I'm sure would have gone much furthur.  Anyway the geofence kicked in, activates RTL and turns the plane round heading straight for home.  I'd forgotten about the geofence setting and assumed the rx had lost signal.  Anyway, the FY41 wouldn't let me take control again as it came back under the geofence range.  It brought the plane straight back, controling the motor speed to maintain a pre-set cruise speed and switched to Autocircle overhead when it got back.  I had to switch the radio off and back on before I got control back.  Anybody got any ideas or just a FY41 software bug ?   

I can't see that it would have been anything to do with the L9R rx.

For it's part the FY41 RTL  worked a treat in bringing the plane back, just a bit possesive in letting it go again   (?)

[dogzilla]

Not sure about the geofence bit mate but turn that feature off and try again cos I'm very interested in how good those LR receivers are  :)

Sounds like a nice feature if you want to let beginners fly around but seems like the best geofence is your brain? After all, if your plane decides to bugger off on it's own, what makes you think the geofence would kick in? I assume once it starts buggering off you'd flip it into RTL first thing anyway?

[MarkLloyd]

Yes, you're right, if it flies out to a point that it loses signal the RTL will kick in anyway, which Is why I wasn't bothered about ditching my telemmetry receivers in favour of the L9R. 
The geofence setting was just one of the parameters that needed a figure when I set it up, so I tapped in 2850m as I'd never been much over 2000,  I'd completely forgotten about it.  I'm looking forward to another try out of the L9R,  it was all looking promising until that point. :+

[BigT]

What version firmware? Is it 41 lite or heavy? Both my 41s do this: on tx/rx signal loss the rtl failsafe function engages returning the model to home at the height it was at when fs engaged. When the model reaches the diameter of the circle you have set it will turn right then establish auto circle. If it above 100m it will descend to 100m. If below 100m but higher than 10m it should climb to 100m (however no one has had this bit work yet). To regain control you must reboot the tx. In my opinion you did not hit the fence because when you do the model will turn left or right depending on the shortest route and rtl until 10m inside the fence then switch back to manual control.  In my opinion you lost signal. I made the same assumption early on. The only way to confirm is to reset geofence to 4000m and try again. This way you will find the range.
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[BigT]

Oh and be aware that with 1.22a fw you do not control the throttle in any auto flight mode.


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[MarkLloyd]

Hi Tim,

It's the full fat version of the fy41 . I think it's the 1.23 firmware, certainly later than 1.22

I've had it automatically switch to RTL several times before when it has lost signal on the DHR-II  rx and then as soon as reception has been re-established , usually within a second or two of it turning round  "RTL" disappears from the display  and it has passed control straight back to me. 

I'm pretty sure it was geofence that kicked in as I was watching the display closely to keep an eye on range - to see if it would break 3k . It definately swung round at what I thought at the time was 2850 and when I later checked the FY41 settings that was the figure geofence was set at.  It made a perfectly straight path for home with the motor  switching on and off to maintain  the pre set speed but I had no control over its return, it just wouldn't hand control back .  I didn't want to switch the radio off  and on until it was overhead just in case I did anything to upset the RTL which was bang on course.

I've reset the geofence to over 4k  so when I get chance I'll try again.  I'm pretty sure it wasn't signal loss though, as I said the geofence was set to 2850 and that's exactly  when it did a left turn and headed straight back.  If they've programmed it to not hand back control until it's overhead they're nuts ! :+

[BigT]

Mine has done both. I have 1 with frsky rx and 1 with futaba r7008sb rx. Futaba 14sg tx. With the frsky once it loses tx signal it comes home  and you need to reboot the tx to get control. With the futaba rx I have telemetry to the tx screen and you can see the rssi. My observer watched the signal fade in and out and the rtl was instant. But on this system I have to recycle the sw 2 from null to rtl and back to regain manual control. Try setting the fence as you suggest. Or get some height and distance and switch off the tx. I think the assumption Fy make with fs is that you want the kit back overhead until the battery runs down rather than 3 klicks away. Trouble is rtl failsafe I breaks both CAA and BMFA current regs which state that on signal loss the throttle should close to prevent a flyaway. I know which I prefer!


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