Another TBS disco build...
Summary:
Flies surprisingly well! It still seems a bit "pendulum-y" in pitch, but on the whole, it flies very straight and true. Needs a fair bit of power to get in the air though. But yet another unrequested land event for reasons unknown. I wasn't stressing it at the time. I have one of these nearly once a pack.
Stats:
Take off throttle: Around 65%
Flight time: Around 14 minutes, pushing it around.
Compassmot: 0%. Yup.
Vibes: Good (and this while pushing it around a bit). Full sticks will take it to the recommended +/-5 limit though.
COG: With a 5000mAh 3S, I'm on the furthest internal rungs on the frame. This in turn pushes the APM to overhang the Core a fair bit. This meant putting in 4x 6mm risers, and balancing the APM on these, using double moongel corners. A whole section of moongel was placed over the core, which helped keep the APM level.
PID's:
- V config selected
- Roll and pitch linked
P: 0.145
I:0
D: 0.008
- Yaw - P bumped to: 0.225
All other dynamics settings at factory default (I've made changes to RTL and failsafes though).
Specs:
- TBS Disco version 1.3 with "Core" (inc the worst screws ever to come out of china btw)
- APM 2.5+ with double moongel corners
- APM power module
- External "2.6" GPS
- DJI riser (cut to 5cm...c'mon 3DR, some longer wires for the new unit please!)
- Rctimer Simonk 30A OPTO escs with one twist in power cable and shortened to 3cm before soldering
- Spektrum AR8000 (telemetry disconnected this time)
- T-Motor 2216-11's
- Graupeur e-power 1050 props (will upgrade to CF once flight tuning is done)
- Immersionrc 5.8 25mwW + bluebeam (yes, that's *way* underpowered!)
- 433mhz 3DR telemetry
- Nano-tech 5000mAh 3S.
First flight post-PID calibration. Some high frequency vibes at the edge of frame; not sure what's causing those yet. PID's too high? Flew FPV via gopro and crappy whip aerial while waiting for bluebeam and CCD; was ok actually - surprisingly good range!
Comments
In fact, t-motor themselves have the motor running "hot" on 1038 and 4S (here). Should I worry?
Cool - I'll look into a 4S battery then; ecalc says my 2216's will overheat though, with 1050 props? ecalc has the motors taking too much power (274w vs designed max of 210w). But t-motor have the 2216's ok with up to 4S and 280w...which one is correct? I'm assuming t-motor...
You'd probably do better with a 4s battery. I use APC 10x4.7 props and a 4s 4.5mAh battery.
Nice to see all the Disco's with an APM, I've spent about 2 weeks trying to tune mine. Some days are better than others. But with a newborn my time is limited. I have my APM over where the Core would be just to get it away from battery interference. I got 6% interference but im also using some MUMetal over the positive traces in the board. You should consider a 4s battery, it was like night and day once I upgraded. With a 3s ThrottleMid was 620 the 4s got that to 450.
Enjoy flying.
Ill try...some side shots do?
Hope you can see that:
- ive used the last position for the battery bay risers.
- the APM sits directly in front of them, with a small space for the servo outputs
- the front overhangs the Core