Multirotor, multicopter and quadcopter discussion - The Drone thread

T9 have them in Stock, went with the newer S-bus version as you can mod them to work without an inverter cable.....16 channel bliss....
 
Off down the test field to test out clean flight and ghandi's PID's, will report back, its a little windy but see how it goes


Felt good, no noticeable oscillations, although I may have to check camera for that, but unfortunately I think the battery wasn't charged in the mobius, so I may have around 30 second footage.

One thing I am noticing is and I am not sure if it was quite windy, but I cant really gain lots of speed ? the place I was at was a little ungrounded, so not flat like my normal spot

It defiantly feels a little more locked in, and so far (got to see if I can scramble camera footage) stable with no oscillations :)

EDIT: Checked footage, I think i took off in horizon mode but switched to rate mode straight away, even still you can hear its a lot better, not worth me uploading a 6 second video but I think we are on to a winner, just need to try and find out why it felt a bit slow flying, maybe because I didnt open it up properly in the different lack of space I had.

Thanks again Ghandi :)
 
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Noob Alert

I apologise I am no doubt asking a much asked question but negotiating the forum on a phone is not easy.

I have no quad copter or RC experience, I would like a quad so I can inspect the roof, soffits and chimney of my house. The height is far too much for a ladder inspection by an amateur.

I had seen the Hubsan X4 mini advertised at £50 and it seemed this might do the job. But more experienced recommendations would be appreciated.
 
DJMK4 said:
Off down the test field to test out clean flight and ghandi's PID's, will report back, its a little windy but see how it goes


Felt good, no noticeable oscillations, although I may have to check camera for that, but unfortunately I think the battery wasn't charged in the mobius, so I may have around 30 second footage.

One thing I am noticing is and I am not sure if it was quite windy, but I cant really gain lots of speed ? the place I was at was a little ungrounded, so not flat like my normal spot

It defiantly feels a little more locked in, and so far (got to see if I can scramble camera footage) stable with no oscillations :)

EDIT: Checked footage, I think i took off in horizon mode but switched to rate mode straight away, even still you can hear its a lot better, not worth me uploading a 6 second video but I think we are on to a winner, just need to try and find out why it felt a bit slow flying, maybe because I didnt open it up properly in the different lack of space I had.

Thanks again Ghandi :)
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No worries. Glad it's working a bit better.

Might be worth having a look at the min/max throttle settings as they probably will have been re-set when you flashed the new hex file. Shouldn't affect things too much though.
 
PlacidCasual said:
Noob Alert

I apologise I am no doubt asking a much asked question but negotiating the forum on a phone is not easy.

I have no quad copter or RC experience, I would like a quad so I can inspect the roof, soffits and chimney of my house. The height is far too much for a ladder inspection by an amateur.

I had seen the Hubsan X4 mini advertised at £50 and it seemed this might do the job. But more experienced recommendations would be appreciated.
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If you are considering the X4 with a camera, you might want to check some sample video on YT before you go down that route. The resolution / quality is very low on this model so not sure it would have the level of detail you want.

Also if it's a chimney you want to fly around - you might struggle to do this without any sort of live video feed flying line of sight only.

Then comes camera stabilisation - to really see what's going on you will benefit from a quad with a camera gimbal - but we are now talking ££ hundreds... Might be worth asking around to see if anyone has a DJI Phantom they could fly around and take some footage for you?
 
gandhi said:
I shouldn't worry. Once you include postage, most of them come to around the same price. I think I even paid £29 when 250 quads first became popular and they were out of stock everywhere.
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Yeah I would have only saved a quid or 2 at most.

On another note, I'm so glad I never used that frame. I used your pids and like DJMK4 it worked pretty well but I upped the rc expo and another rate which I can't think of atm for faster flips and rolls but it messed something up as when yawing fast it would go crazy and wobble. Flips wouldn't complete and it kept freezing upside down for far too long, That didn't end well and I broke an arm and pulled a wire clean out of a motor :(
 
spookywillow said:
Yeah I would have only saved a quid or 2 at most.

On another note, I'm so glad I never used that frame. I used your pids and like DJMK4 it worked pretty well but I upped the rc expo and another rate which I can't think of atm for faster flips and rolls but it messed something up as when yawing fast it would go crazy and wobble. Flips wouldn't complete and it kept freezing upside down for far too long, That didn't end well and I broke an arm and pulled a wire clean out of a motor :(
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Sorry for your loss :(

The wobble on yaw is possibly because the naze32 will slow down 2 of the motors and speed the other 2 up to provide the rotational force needed. If it runs out of headroom in either it will induce a wobble - the input is asking it to rotate faster than it can. At least, that's my understanding of the process. It might also be a product of the yaw PID settings, but my understanding of that isn't complete.

Not sure which rates you upped but increasing the rc expo won't make it flip faster, just be twitchier nearer the center - but you probably already know that!

Worth reading this bit from CF docs regarding rc/p&r rates for flipping speed...

RC rate, Pitch and Roll Rates (P/R rate before they were separated), and Yaw rate

RC Rate

An overall multiplier on the RC stick inputs for pitch, rol;, and yaw.

On PID Controllers 0, and 3-5 can be used to set the "feel" around center stick for small control movements. (RC Expo also affects this).For PID Controllers 1 and 2, this basically sets the baseline stick sensitivity

Pitch and Roll rates

In PID Controllers 0 and 3-5, the affect of the PID error terms for P and D are gradually lessened as the control sticks are moved away from center, ie 0.3 rate gives a 30% reduction of those terms at full throw, effectively making the stabilizing effect of the PID controller less at stick extremes. This results in faster rotation rates. So for these controllers, you can set center stick sensitivity to control movement with RC rate above, and yet have much faster rotation rates at stick extremes.

For PID Controllers 1 and 2, this is an multiplier on overall stick sensitivity, like RC rate, but for roll and pitch independently. Stablility (to outside factors like turbulence) is not reduced at stick extremes. A zero value is no increase in stick sensitivity over that set by RC rate above. Higher values increases stick sensitivity across the entire stick movement range.

Yaw Rate

In PID Controllers 0 and 5, it acts as a PID reduction as explained above. In PID Controllers 1-4, it acts as a stick sensitivity multiplier, as explained above.
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Was it the HK frame that broke or did you actually manage to break one of the carbon fibre arms?
 
No worries and thanks for that. I doubt it's lack of headroom as I was only around 60% yaw speed and it was fine before I changed stuff so i'm going to put it all back to how it was. It was the HK frame that broke and no repairs as it's a 1 piece frame.

I think I fixed the motor last night but have yet to try it.

I increased RC expo so it's a linear curve and not gradually increasing, back to the drawing board. I't my own fault as it was behaving incorrectly but I just carried on flying :D

One thing about my motors, When you turn some by hand they will judder as it rotates around the magnets which seems normal but some just glide round like the magnets don't affect it. Faulty motors or normal?
 
Jeeze that was close. Rssi signal tracking saved my bacon just. Had to get in the car and follow signal. Thought id lost the 250

Came to the Brecon beacons but I think i may have to find a better location, I risked, really big risk flew over Reservoir, also flew near a quiet valley where the sheeps roam about, thats where I lost it.

Took an hour to pinpoint the signal, I thought the signal was weak due to low battery, I knew where I came down but I was wrong, thats why I was concentrating on that area, I had to get in the car and drive up abit, got covered in some running water, stung, strod in sheep poo.

But glad I got it back.

Think next time I am going to need to plan this properly not just go flying without scoping out risks in new locations

I will post some footage but I doubt it will be great flying wise, was very nervous out of terratory, but the views should be ok :p
 
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I'm a bit confused- my cheapo quad fell from about 5ft a few weeks ago and broke a motor. Today, it fell from 115ft and is fine, including the motors having to reverse as it fell out the sky upsidedown :/

my first youtube video...

 
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