Disco Tips back in Forward Flight :(

[dp106]

Help 

Don';t understand I';ve done everything correct I think. Got my CoG over the CoT mark on the bottom plate.  Placed the Naza in between the white lines, which incidentally isnt on the CoG... The guide does say you should mount the MC as close to this as possible but the TBS location is a fair way from this.  Could this be why the quad isn';t holding it';s attitude in forward flight? 

Or maybe it';s my gain settings?  Currently they are 140/130/130/130  140/130

[dp106]

Well in the absence of any advice I';ve been trying to work this out. Hasn';t helped with the weather as I';ve had no chance of testing anything.

Found a very useful link on RCGroups which suggests the basic gains can affect the multi holding its attitude so I';m going to try uping them some more.  http://www.rcgroups.com/forums/showthread.php?t=1796013 I did have the pitch gain set to 150 at one point and it still displayed the same behaviour so not entirely hopeful this is the cause.

Not found anything to suggest I should move the MC location. I did find in some instructions that the cog should be 15mm forward of the CoT so I';m going to try and shift that forward to see if that is the cause...

[teslahed]

Center of gravity being out is the simplest most likely cause of tipping forward (or back, depending) in fast forward flight i think.

[dp106]

Cool, I';ll give that a go first in favour of adjusting the gains then..

[dp106]

Braved a small test flight this afternoon and moving the battery further forward and shifting the CoG did seem to improve it a lot.

Can';t help but think that this is moving the COG towards where the Naza is located.  So surely it would be better to have the center of thrust, gravity and the Naza all located at the same point.

Would be interested to hear the experiences of any other people using the Naza Lite with the Discovery frame..

[Jumpy07]

The COG and COT are two different points on TBS frame..  which is why its a bit odd to balance.. 


If its tail end down its def balance issue.. shove the lipo forward...  also check the Naza IMU settings in assistant.

[dp106]

The COG and COT are two different points on TBS frame..  which is why its a bit odd to balance.. 


If its tail end down its def balance issue.. shove the lipo forward...  also check the Naza IMU settings in assistant.

cheers, I';ve checked the imu and it said it was ok and didn';t need calibrating so I did it anyway :-)

[Flydontdie]

Just ditched my naza lite, totally rubbish, had to wait 2-3 mins in air before gps lock, last flight with it, it took off had zero control and hit the ground at full forward throttle from about 20 feet up.  couldn';t be sure it it was the lite or the turnigy 9x, threw both in the bin got a v2 and futaba kit.

Never again will I go down a cheap route.

[dp106]

Naza Lite isn';t really the cheap route.. Cheap route is the kk2. (And I';m not dissing the kk2 that';s what I started with).

I think you may have to wait 2-3 minutes for a lock be it the lite or the v2. I don';t take off until it has a lock. Sometimes it can take a couple of minutes others under 30 seconds.

[dp106]

I can';t decide what to do with mine it seems OK in forward flight but what I have noticed is if I back off the throttle and it starts to descend it will tend to tip back and stay to descend bum first.

Not sure if people normally fly in manual mode with the discovery. It doesn';t have any issues in the other assisted modes but then I guess the controller is compensating in those modes. I think mounting the Naza over the cot would be better and then get the cog to the same point..

[teslahed]

Just ditched my naza lite, totally rubbish, had to wait 2-3 mins in air before gps lock, last flight with it, it took off had zero control and hit the ground at full forward throttle from about 20 feet up.  couldn';t be sure it it was the lite or the turnigy 9x, threw both in the bin got a v2 and futaba kit.

Never again will I go down a cheap route.

Well it wasn';t the turnigy 9x. It wouldn';t cause a failure like that and i know many people (including myself) who';ve used them for years. They are very good radios - but worth checking the soldering on stuff like the switches.

The most likely fault with a cheap radio like the turnigy 9x is dodgy soldering to things like the switches and dials. If all your switches and dials work you are probably fine but you can always unscrew the case and have a look inside if you want to check.

The naza lite is a very good flight controller that lots of people have success with. Very stable when properly configured. Also - £100+ isn';t cheap for a flight controller. £20 is cheap - my latest quad is flying with a £13 controller and flies fine.

I suspect your problem may have been something other than ';buying cheap';. Shame you didn';t keep the pieces - i am sure someone could have helped work it out. Or bought them off you.

[nlfpv]

I can';t decide what to do with mine it seems OK in forward flight but what I have noticed is if I back off the throttle and it starts to descend it will tend to tip back and stay to descend bum first.

Not sure if people normally fly in manual mode with the discovery. It doesn';t have any issues in the other assisted modes but then I guess the controller is compensating in those modes. I think mounting the Naza over the cot would be better and then get the cog to the same point..

If you fly naza in manual you have to crank up the gains a lot[emoji12] [emoji106]

[flybywire]

I can';t decide what to do with mine it seems OK in forward flight but what I have noticed is if I back off the throttle and it starts to descend it will tend to tip back and stay to descend bum first.

Not sure if people normally fly in manual mode with the discovery. It doesn';t have any issues in the other assisted modes but then I guess the controller is compensating in those modes. I think mounting the Naza over the cot would be better and then get the cog to the same point..

There is no such thing as normal when it comes to fc';s and flight modes, they are all different, and have been developed to provide the best flight experience for your particular need, whether that be AP work, where you need super steady and semi autonomous, or flying acro where you need total control, or some assistance, to achieve this, i.e, the naze fc';s have barrometer, which will mix constant height with varying degrees of self level, or very little self level, or the cc3d that has no barro, so the pilot must use his skill to both maintain height and orientation. 

You choose!