Not a problem Tridge.
It is a little self serving in that I’m interested in a Disco QP myself!
But I’m happy to share the results and make the 3D print files/parts, or whole assembly available as a kit, for those that don’t have access to a 3D printer.
From the photos I can see what you mean with the Disco elevon servos and plastic arm. But I think that can be overcome by placing a flat CF spar (15x3mm section) under the fuselage side of the wing connection point (which should miss the servo assembly), and mounting it by 3D printing a 2mm thick L shaped bracket, with all the relevant wing spar penetrations etc. and a slot on the bottom of the L bracket to hold onto the quad arm CF spar. The servo arms should manage to bridge the 2mm extra gap without any modification to the Disco, alternatively creating a recess for the bracket by trimming the wing side foam with a hobby knife will work too.
I’ll do some CAD drawings tonight to demonstrate what I mean. For that could you maybe please redo the photos so that they are as perpendicular as possible, along with a ruler for scale, then I can already make up a fairly accurate CAD model using just the images. It would be good to have a photo of each side of the wing connection as well as from underneath the whole fuselage. Could you also give me the dimensions of the battery and a photo from the top with a ruler as scale?
I haven’t quaded a wing yet, but from the photos some optimisations will need to be done to make it work, preferably without many changes to the Disco itself:
- The forward motor prop has to clear the quad arms which should work, as the prop arc and low quad arm mount position should leave enough clearance
- The spacing between the quad arms is fairly narrow by putting them on the wing connection point, but we haven’t experienced any roll control issues with our narrow Talon QP mod yet. I think it will be fine as it also weighs 1.2kg less.
- The quad props need to clear the fuselage and be distanced symmetrically to the airframe CoG. (Within reason, as I think we can more dynamically add quadplane parts than just squarely on the CoG. For example; pushing the quad CoG forward will give it better wing AoA in hover, if we can offset pitch trim in hover, which should work well with some quad motor forward tilt on the motor mounts themselves, plus maybe even some upwards pitch on the elevons)
- We’ll have to investigate the best spot to pull the quad arm cables through the fuselage to connect to the CHUCK spare PWM’s, and make a XT60 adapter for the 4x XT30 quad power etc.
- The 3D printed L bracket might need some little extrusions on the bottom so when it lands as a quad it sits fairly straight and gives the quad motors a bit of clearance off the ground.
- I’ll need to have a look at how to best configure the 18650GA batteries so they fit in the battery spot, on the same CoG (subject to 3. above), with little to no Disco modification. In the mean time I think the Disco battery should be ok for 20A hover, but maybe use another cheaper, easy to replace 3S battery instead for testing. The battery is quite close to CoG so it shouldn’t be to hard to do.
Funnily enough I was already looking at sourcing some spare Disco airframe parts for a build using a PXH mini, and a PiZero controlling a downwards facing camera and comms. Happy to pay for them and freight, or otherwise maybe we can do a swap, custom built up quad arms for the Disco with custom built 18650GA batteries for a CHUCKless Disco?