Attitude and GPS sudden ascent

Explorocam

Explorocam

Airborne Media Pros
Whenever I flick into attitude or GPS lock my DJI F550 suddenly ascends, I have to pull the stick down to stop the raise, but when I go back to manual the Hex will suddenly drop and descend and I have to give throttle to stop the plummet.

Why can I get my Hex to just stay at the same altitude when I turn on Attitude or GPS hold?
 

VINHEX

VINHEX

Member
I always start mine with gps never started in manual. Not sure if that would make a difference..
 

kloner

kloner

Aerial DP
this happens from not being propped right. mid stick in atti or gps atti is exactly 50%, or mid stick. if you fly in manual and the props are too big hovering can range from 1/4 to 3/4 throttle. if your at 1/4 throttle then flip to atti, atti is looking for mid stick to keep you at the altitude.

fixes are decrease cell count
put on smaller props
live with it

honestly after all the "testing" i've done, by doing what you got here makes for the best mileage possible. when the throttle is half or more in manual and you flip to atti and it rises, your getting the worse possible mileage, makes the motors run wide open alot more. too big of props though will make em go over rating watts wise and eventually will start blowing motors
 

Explorocam

Explorocam

Airborne Media Pros
Really? I'm confused. I had the stock 10x5 props and then I switched to the Graupners 10x5. The machine is running very quiet now to. Heard that the Graupners were supposed to be very efficient.

My set up ARF DJI F550, 3s 5000mAh, Graupner Props 10x5.
Is there something wrong with my setup by chance?

So should I go back to those stock props that I've heard terrible things about?
 
Last edited by a moderator:

kloner

kloner

Aerial DP
the stock props have so much flex they don't show it as bad, less efficient too

The ideal fix is 9"x5" or live with the drop. How often are you flicking in and out of manual? mines always done it cause i've always ran em propped a little high
 





kloner

kloner

Aerial DP
yes or add a bigger camera. at one point the 3s 10" runs out of game so be careful. it'll barely want then goes from flying to a descent with no choices but down. if the thing feels heavy, keep it low and over flat ground

it would be a parralel connection. i take deans and solder them into these kinda things, no wire, just the connectors like this, ben the paralel ones together to the opposing sides ground side, top + side is just one big slab of solder
 

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Explorocam

Explorocam

Airborne Media Pros
Hey ksrimoungchanh,


I'm thinking of dual packs in parallel. Actually, that's a great idea. I'm also thinking of running a 4s bat. Will try one out tomorrow when my best friend comes up to Ottawa.
 

Explorocam

Explorocam

Airborne Media Pros
kloner said:
yes or add a bigger camera. at one point the 3s 10" runs out of game so be careful. it'll barely want then goes from flying to a descent with no choices but down. if the thing feels heavy, keep it low and over flat ground

it would be a parralel connection. i take deans and solder them into these kinda things, no wire, just the connectors like this, ben the paralel ones together to the opposing sides ground side, top + side is just one big slab of solder
Click to expand...

Thanks man, Yes I'll try a parallel. I actually use Anderson Power Poles. They are the best! and no soldering necessary.
 

Explorocam

Explorocam

Airborne Media Pros
ksrimoungchanh said:
Could Explorer do a dual pack? would essentially add weight and extend run time.
Click to expand...

So, just to make sure I understand; You are saying that the bird is too lite/light (not sure of the correct spelling) for the props. But I don't lift off until I get to mid stick, then I'm in a hover. But when I switch to GPS mode the bird thrusts up quite quickly. I don't understand why that means it's too lite/light, I thought it had something to do with the stick position: like the stick had to be in a higher than normal position because the prop wasn't giving enough thrust, then when I made the switch to Attitude/GPS hold the bird was trying to catch up with the stick position....

*Brain Fart*
Oh! I think I get it! You are saying that the Attitude mode is telling the motors to spin the props at speed n for attitude/altitude d, but because the bird is so light for the Graupner props speed n actually creates excess lift.

Kind of making sense, since I switch to the Graupners, the motors are running way cooler.

I was wondering; What if I went to 4s with the 10" props. Do you know if anyone has tried 4s on Graupner 10x5 props?
 
Last edited by a moderator:

T

Tahoe Ed

Active Member
The simple solution is to mod your throttle curve so the switch from manual to ATTI or GPS/ATTI is seamless. Your craft goes up when you engage ATTI then raise the curve which will lower the stick. You will have to play with it to get it right.
 

Explorocam

Explorocam

Airborne Media Pros
Tahoe Ed said:
The simple solution is to mod your throttle curve so the switch from manual to ATTI or GPS/ATTI is seamless. Your craft goes up when you engage ATTI then raise the curve which will lower the stick. You will have to play with it to get it right.
Click to expand...

Hey, that's a good idea! I keep forgetting that I can do that with the Naza. I'm used to the Open Pilot Copter Control, witch doesn't like any radio mods at all. With the OP CC it's all done in the GCS. Thanks Tahoe Ed, that's good advice. Any ideas about running 4s?
 

Explorocam

Explorocam

Airborne Media Pros
New question; IO

You guys have been a huge help on this topic.

Any idea why my "intelligent Orientation" isn't working?

The switch is responding in the Naza software and showing that's it's working. But when I'm in flight nothing happens when I switch between the different mods. The software shows the blue highlighted area moving from "Off", "Course Lock" to "Home Lock" when I toggle the 3 position switch. But, When I toggle the 3 position switch in flight nothing happens. Have I missed something?
 

T

Tahoe Ed

Active Member
When you switch to Course Lock in either ATTI or ATTI/GPS are you getting the yellow and green flashes? Check pg 38 of the manual. it seems that your compass is not calibrated. Without that, you cannot use IOC.
 

Explorocam

Explorocam

Airborne Media Pros
Tahoe Ed said:
When you switch to Course Lock in either ATTI or ATTI/GPS are you getting the yellow and green flashes? Check pg 38 of the manual. it seems that your compass is not calibrated. Without that, you cannot use IOC.
Click to expand...

I did calibrate my compass. Switched between manual and GPS lock about 10 times waited for the light and then rotated the Hex 360, when the light changed colour I tilted the Hex vertical and rotated again for 360, after the light went out. Plus, it holds in GPS mode. I may not have rotated in the right direction. Not sure.
 



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