Twin Hopper part 9 (endurance test with 2.4kg li-ion) 

Yeah the bearing should still be replaced. I think all I did was press the races a bit closer for a temporary improvement.

@@iforce2d Yup. :)

Well... actually ball bearings do have axial play, it's a function of radial play, the contact angle and any preload. These are likely standard deep groove bearings which as they wear increase both radial and axial play (or are just high clearance to begin with). By snugging up the collar they are being used like a poor man's angular contact bearing.

Yes, it had a tiny bit of both radial and axial play.

@@iforce2d Well, when they wear out, you get both. They're bad, case closed. :)

The speed was typically a little over 60km/h, so as a rough estimate 100 minutes would be about 100km

Nothing in particular, it's just the challenge of pushing the limits to see where they are. I'll probably make landing gear someday so I can land on that airstrip properly, then maybe try an auto mission that takes off and lands there, would be cool. But not sure if I can be bothered :)

Thermals push the entire plane up or down, they don't cause it to pitch or roll, especially at this scale. That's why glider pilots use a variometer (either audible or in my case the climb-rate display on the OSD) otherwise they would have no clue they even found a thermal. It's like swimming at the beach and getting caught in a riptide, you don't suddenly get spun around and feel it happening, you only realize when you notice you're way further from the shore than you expected. If you're flying a full size glider with a much longer wing (like 20 meters) then sometimes a very strong and tight thermal might cause one wing to bump upward, but pitch is not affected in the same way. In every flight I have done with this plane the pitch oscillations happen in manual mode with flaps down, no matter where it's flying or whether there are thermals around, and it was also happening before that hillside collapsed and exposed the sharp ledge.

Usually I have a rough idea of the type or style, and how I can make it happen with the parts I already have available, so the size and weight are limited by that. I start by using OpenVSP which is purpose-made for this, and can give a good idea of whether a design will be stable. For CAD I use whatever I happen to by trying at the time, simple designs might be QCad but for this plane I was using OnShape and Fusion 360.

As long as a single motor is enough to launch and fly, then it will always be more efficient than two. More motors give better performance in climb, takeoff roll etc and provide redundancy for safety - the goal is not really efficiency. Look at those military drones that fly for 27 hours or whatever it is, they are all single prop.

@@iforce2d Hey, I really appreciate you taking the time to answer my questions. You're awesome!

That's next on my list.

You might be able to get a rough idea of the build time from watching the earlier parts of the playlist: ru-vid.com/group/PLzidsatoEzehdnJEIlFkqYMygb2der2rn As for learning, I've been building 1-2 planes a year for about 6 years I guess, and watching a lot of RU-vid videos of everybody else doing it too :)

Nothing in particular, it's just the challenge of pushing the limits to see where they are. I'll probably make landing gear someday so I can land on that airstrip properly, then maybe try an auto mission that takes off and lands there, would be cool. But not sure if I can be bothered :)

It’s for an air tractor for the farm ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-QtrIV7VLm-g.html

It's for aerial top-dressing ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-QtrIV7VLm-g.html The building used to be a shearing shed many decades ago when sheep were run here.

I wondered that as well!

The throttle required to maintain altitude depends on the weight of the aircraft and the battery voltage, and a few other things. You can't expect it to be some specific value.

@@iforce2d in baro mode quad should not respond until mid throttle right just like in arducopter But my quad throttle response is like it is in angle or acro mode.

I see what you mean. But I have no idea about how that systems works. If the behavior of the throttle didn't change in that mode, my first guess is maybe it didn't actually go into that mode at all. In ardupilot a mode change can be rejected if the required sensors are not working, maybe baseflight is the same. With ardupilot you would be able to figure it out from the log, or from the OSD info, or from the ground station, no idea about baseflight.

@@iforce2dthanks sir, anyway I left baseflight and i have a beautiful project in mind. We know that those f4 flight controller are a bit expensive for first time diy people, so why not we build a current generation flight controller using 5 dollar stm32f411cue6 blackpill module running inav , because beginners have no choice rather than using those old generation multivii, cleanflight badass.

New Zealand

@@wezm it deserves

It’s for an air tractor on the farm ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-QtrIV7VLm-g.html

It's for aerial top-dressing ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-QtrIV7VLm-g.html