Jumper Xiake 800 Flight Controller

[Ramaz (Ramzes)]

What do you say if I install the F405 flight controller, is it possible to flash it with the settings from the original controller?

[Adilson (Adilson Oliveira)]

I believe at least the Q_ parameters, the channel mappings will change because the hardware is different but don’t quote me on that, I’m learning it myself.

[dkemxr (Dave)]

@Ramaz

What do you say if I install the F405 flight controller, is it possible to flash it with the settings from the original controller?

I would not suggest loading a saved (or posted) parameters file from the old FC. Flash the latest Stable version of Arduplane, enable the Q parameters and then update the parameters manually from the saved parameters file. At least that’s how I would do it. A text editor like Winmerge (or online versions) helps with this using file compare.

[fpv_duck]

Hello everyone,

I did the maiden flight of this little bird. It flies well, but I ran into two issues:

1. It does “backflips” when performing the transition from Q_Stab to FBWA or Accro:

It doesn’t always happen, but it’s often doing one or more backflips, like in this video:

Xiake800 Backflip

After the flip(s) it flies normally. Nothing else seems wrong while flying, so I guess it’s something specific to the transition phase.

2. The Rx antenna connector doesn’t seem to be a standard U.FL connector. I damaged the stock antenna, and I wanted to replace with some “elrs antenna” I ordered, but the connector is too big. Is the smaller U.FL connector something standard? Can I find an antenna that would work? Or do I need to swap the Rx as well?

[Adilson (Adilson Oliveira)]

I had the same flip when I was testing Q_HOVER and Q_STAB so I guess it is not only during the transition to horizontal flight. Fortunately, I was very low and over high grass so no damage was made. After that, I decided to ditch the controller and use a Matek VTOL instead. I’m right now working on how to install it.

[fpv_duck]

Interesting. In my case I think it’s just during the transition, I had no problem in plane or Q modes.

I’m going to dig a bit more before I swap the FC, I bought this plane so I could have something that flies right of the box, I don’t want to tweak it that much.

I found something quite interesting here: QuadPlane flips during transition - #39 by Robel_Efrem

@Robel_Efrem

Arduplane does not fully stabilize the plane during transition, almost immediately after the fixed wing propeller is at full throttle, stabilization is handed over to the control surfaces. The quad motors stay on just to maintain altitude, not attitude.
So the root cause of the problem was the fact that the manufacturers supplied us with the wrong CG location, the platform was a new version at the time without backwards swept wings and they still had the old CG specifications in the description. I reached out to them to confirm and they sent me the updated version, after perfectly balancing it at the correct cg location it transitions perfectly.
This means the transitions are very sensitive to external factors but it is working for now.

I did not check the CG before flying (I know…), so perhaps that’s the reason.

[Adilson (Adilson Oliveira)]

Has anyone here already replaced the FC with the Matek F405 VTOL? I’m doing this right now and would like to exchange information. I’m unfamiliar with Arduplane and would like a better idea about which channels to connect the motors, servos, and other sensors. I understand this is mapped on the Matek page but would like to have some confirmation.
Thanks in advance

[flagio (Peter Holman)]

Where exactly is the CG from the Xiake 800? Mine has also backflip the first test flight just like Adilson in Q_Stab. mode, and it crashed. I broke one of the props.

[flagio (Peter Holman)]

No i was wrong. I think if the front tiltmotors switch too fast and the backmotor is not off yet. I think the plane wil flip not back but foreward

[dkemxr (Dave)]

I would probably be there with you on swapping out the FC, although I would use an H743, but these are not readily available in the US and less so in Mexico where I am at present. No way would I pay the shipping going rate for this plane and the Jumper distributors here must not want this thing.

[Adilson (Adilson Oliveira)]

Any specific reason to use the H743?

[dkemxr (Dave)]

No feature limitations, latest supported tech, futureproof. I realize you don’t need an H7 to fly this plane but it’s what I would buy for any craft today. Ardupilot features are only increasing so a fast processor with 2mb flash doesn’t hurt.

Edit-A good argument for the vtol/wing boards is they have useful BEC’s. Certainly a consideration for some applications.

[Adilson (Adilson Oliveira)]

You are 100% correct. In this case, I just decided to buy this board because it was featured in a series about VTOL on Painless360’s youtube channel.

[dkemxr (Dave)]

I think it’s a good choice.

[Adilson (Adilson Oliveira)]

I’m working on replacing the original FC with it right now but I had to order a servo extension as the ones I have around are either too short or too long.

[Da_Chef (Robert Martinek)]

I installed a new FC & it works at the bench fine. I went at first with a F405 VTOL - if I loose this plane like the last one it’s then not such an issue. The second plane I own will probably get a H743. I have now to add the FPV camera & mount the gps and wait for better weather. I will share the configuration when I’m sure it works

[Adilson (Adilson Oliveira)]

That’s awesome, please do share. Thanks in advance.

[Adilson (Adilson Oliveira)]

Do you have any news on that?

[Da_Chef (Robert Martinek)]

I work 100% and have family → probably Saturday or Sunday . Weather is than also fine.

[Adilson (Adilson Oliveira)]

Cool. Can you just send the current configuration so I can double-check mine?