Hello!
So I designed and printed vtol plane (wingspan 2.5m). But smth is not working properly and it doesnt want to fly.
So stack is:
FC matek f405 vtol
motors: SunnySky XS High Power X3515S 4x
ESC Readytosky 40A ESC OPTO 2-6S 4x
battery CNHL 6S Lipo 6000mAh (for tests)
But when i give 50% of throttle one of the engines start failing, sort of rapidly changing its RPM. I am not sure its a motor problem, seems more like it is ESC. But dont know for sure… Mb you have faced with similar problem or should i just buy 60a esc? Thank you!
I’m kinda’ old school so I prefer to calibrate the ESCs individually directly to the Rx. This assures me the endpoints register correctly, then do the calibration in MP for good measure. Food for thought.
I ordered 60a ESC, this week will install them. Also another problem might be that my FC is fixed with bolts, and plastic can be very good in transferring vibrations, so probably another idea is to use some anti vibration rubber dampers.
I think 1 / 2 ratio is not good example for VTOLs as indeed it is needed only for couple mins to take off and land.
His current configuration is 1.2. Which apparently is the lower limit according to this. Even if it’s just for take off / landing, I wouldn’t trust the motors to deliver exactly what the manufacturer claims and get a setup that leaves some safety buffer.
I was going to ask about calibration but I didn’t see any calibration instructions for this ESC?
I know a lot of ESCs use similar calibration strategies but are we safe to assume all these sorts of ESCs can be calibrated?
It looks like he’s ordering different ESCs so this is likely a moot point.
I agree a VTOL doesn’t have the same requirements as a normal quadcopter but I still think it’s a good idea to keep the weight within the quadcopter’s limits.
Oh, thats true, I was looking at another engine specs… 5.6kg is definetely not enough… But still worth to try with different ESC and no payload just to make sure that it was ESC problem, as even if its not enough thrust it should not make this weird sound.
Will switch escs soon, for now will update the design a bit as indeed tail of the plain is way to heavy and basically useless. This design is better
Looks very nice. I been designing a few VTOLs in plastic and understand just how controlling weight is important. Currently I have a 5 .5 lbs bird with a 1.2 wing. I also have a 4.2 lbs design 1,2 m.
I have a odd infill design i came up with a few years ago. I model a air gap between the outside and inside walls, That gap is adjustable so I use 1.7 mm to 3 mm. No warping in the sun unless your outside for days and overall somewhat strong.
Rebuilt drone according to design, put new engines with 6.7 kg, drone weight is 5kg. ESC are 60A which is ok for the engines. CG is also fine. The problem still the same. Before take off clear hearable sound from engines like a whistling, then in the end just deep dive, but i think i might push to hard on a control… Need to adjust sensitivity
