Initial lift off

[rsmith21]

Has anyone else found that the initial lift off with their NAZA is a little scary\shaky manual input required to keep it going up. after I land subsequent lift offs are much more controlled, I';m referring to GPS mode ?

[Smeagol]

Similar experience, although I have only had a few flights, was put down to acclimatisation of the GPS to the outside temperature.

After sitting at home, then a car journey, then the outside world, possibly a few degrees change. Some recommend lifting the craft out first and letting it settle while getting ready to fly.

With mine I found that the first attempts to hover it seemed to drift a bit, after a short time it settled fine.

[DarrenG]

How long are you waiting after connecting the battery. The GPS requires a little time to get a position fix and a little longer for that fix to settle down. Ideally you need to allow a minute or two for it to get an optimal position fix before lift-off.

[rsmith21]

How long are you waiting after connecting the battery. The GPS requires a little time to get a position fix and a little longer for that fix to settle down. Ideally you need to allow a minute or two for it to get an optimal position fix before lift-off.

Maybe not waiting long enough then. Its like its in manual mode for the first few feet wobbly then stable.

[DarrenG]

Could well be the GPS then. Perhaps use Atti mode for the few few minutes if you';re itching to get in the air?

[powerlord]

I find with the naza it seems to adjust cog each take off,  but only uses the settings on the next flight (power cycle).  So for example if you';ve moved something about: take off a foot and move a wee bit around,  land,  power cycle and now it will have adjusted to new cog and fly well.  Took me a while to work out that was what it was doing - unlike say arducopter which makes no automatic cog adjustment

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[KK1W]

John has an interesting take on the problem in his blog. Makes sense, going to try take offs in Atti and see if it makes a difference.

http://www.rcgroups.com/forums/member.php?u=42040

I agree about the Naza takeoff, but that being said I haven';t had any problems.

Jim

[Hands0n]

Steve King has a video on the need to let GPS settle before lift off. He suggests a full 3 minutes and demonstrates a rather compelling case for doing so. Admittedly his video relates to GPS Hold (Loiter) and GPS Home (RTL) where the aircraft tend to circle widely. Using his 3 minute method they home in much tighter and reliably. In yet to actually try it out at a field but it seemed better in the back garden.

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[KK1W]

Did one liftoff today. Waited for GPS lock plus a few minutes, then switched to atti and took off slowly. Not a wobble on liftoff. Only one test so hardly confirms or denies I';m afraid.

I fully agree with waiting a full three minutes or more. When I';ve hurried the process GPS hold can easily look like GPS ';toilet bowl';. The red light stops flashing at over 6 satellites, typically I see about 10 on my other units and would expect Naza to be similar. Worth the wait for sure.

Jim

[rsmith21]

Only problem is the flight time being reduced while you wait, I feel the ESCs get a little warm even at zero RPM so it must be consuming power, I wonder if its possible to give the NAZA its own power, or does it have to be the same source as the main battery.

[DarrenG]

With no load the drain would be pretty negligible and will only affect the first battery in a session?

[Hands0n]

Of course ... I meant Peter King, and here';s his video where he demonstrates the GPS lock issue with a Crius AIOP but goes on to say that this issue affects all FCs with current day GPS.

Video here --> https://www.youtube.com/watch?v=tT9nUpRVVoc

It all makes sense I suppose.  That and how well your GPS board performs in the first place.  I keep reading that uBlox is the best. Thats not what is on my HK MultiWii Pro - and it definitely does the toilet bowl thing. Scary in the back garden, probably not so when out in the field.

[Leigh]

here';s how a multirotor should take off - just don';t watch past the first 30 seconds unless you want to see how it shouldn';t land :-)

T Copter yaw block failure crash

[rsmith21]

WOW that was some landing :) , I don';t think I want to be that good 

I waited 3 mins today and took off it Atti mode and no problems, so patience is the key, thanks again all, another problem solved.

[Hands0n]

That 3 minute wait might as well be half an eternity 

[rsmith21]

A few more flights today and after waiting the prescribed time perfect take off. As you say it takes an eternity, check email, check face Book, look around , twiddle thumbs.  Take off.

[Hands0n]

Same here. Three flights today. The first had the full 3-minute pre-flight GPS treatment, Loiter and RTL were spot on. The second flight I didn';t wait after the battery change, Loiter was vague and RTL was about 7-10 metres off.  The third flight was prefixed by the 3-minute wait and use of Loiter and RTL were on target again. 

Next up, I';ve got to sort out the ALT PIDs, mine bobs around like a cork on the ocean at times. I';ve got the Baro in a nice foam coat with the FC inside a nice tupperware-style container (hint, Wilkinsons, £1 a pop).

[Leigh]

WOW that was some landing :) , I don';t think I want to be that good 

I waited 3 mins today and took off it Atti mode and no problems, so patience is the key, thanks again all, another problem solved.

Hehe yes, patience is key. FWIW, the repair was under an hour to get flying again.  I spent another hour improving the yaw block rod to a 7mm dia shaft with M6 thread and threadlocked it into the back boom.  No slopvnow and it wont pull out again in a hurry!