By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by CML

DJI F450 down on power?

All Topics | Latest Posts

Search for:  in Thread Title in  
LHR Dave13/05/2018 19:28:35
avatar
91 forum posts
27 photos

My Dji F450 with Naza lite controller and Spektrum RX struggles to lift off after several months of non flying.

It has been stored in a warm house for the lay off period.

When I try to lift off it scuttles around on the floor and will lift off with some coaxing. Once in the air it seems to perform ok, but it seems to be under powered. I have tried several different Lipo sizes.

So far I have wiped the settings from the DX7s TX and set everything up again. Have plugged the drone into my computer and performed a calibration and checked all switches etc perform how they should. yet after all this it still performs as described.

I am now lost as to what to do , has anyone got any suggestions.

Denis Watkins13/05/2018 19:50:46
2899 forum posts
141 photos

It does sound like the throttle needs recalibrating to produce the full throw, for full power

With the model off

Check your servo monitor on the Tx that the arrow goes bottom to top

Edited By Denis Watkins on 13/05/2018 19:51:52

Biggles' Elder Brother - Moderator13/05/2018 19:52:49
avatar
Moderator
15409 forum posts
1409 photos

Dave have you tried going back to the NAZA software and just doing a complete "rebuild" of each step, as if you were setting it up from scratch?

BEB

LHR Dave13/05/2018 20:00:26
avatar
91 forum posts
27 photos

Yes BEB I went back into NAZA software after i wiped the TX and re loaded the settings. I am pretty sure i have checked the TX servo throw settings but will re visit this.

I am now thinking of stripping the drone down and rebuilding to see if that has ant effect.

LHR Dave13/05/2018 20:15:32
avatar
91 forum posts
27 photos

Settings on my DX7 which i only use for this drone (fly Futaba for my aircraft).

Throttle travel starts at -96 and ends at 97 at full throttle. Which approx the same figures for all controls on there full travel. Not too hot on using this Tx but all seems ok I think.

Biggles' Elder Brother - Moderator13/05/2018 20:20:50
avatar
Moderator
15409 forum posts
1409 photos

Yes, the throttle throw sounds good and the controller should be happy. OK that's the obvious stuff,...how about some less likely, but possible?

Loose props? I know the DJI's are "self tightening, but nothings perfect!

All rotating in the correct dirrections? Right props on the right rotations?

Connections from ESC's OK? Worth breaking and remaking - in case of any oxidisation etc.?

Batteries fully "fit"?

Just some ideas of things to try....

BEB

Tom Sharp 213/05/2018 20:31:16
avatar
3018 forum posts
16 photos

could be the compass needs recalibrating, on low power for safety

LHR Dave13/05/2018 20:42:24
avatar
91 forum posts
27 photos

Will try all these things tomorrow morning.

Would the compass recalibration be in the Naza Software?

LHR Dave16/05/2018 10:21:08
avatar
91 forum posts
27 photos

Latest update.....

I have checked all connections to esc's and flight controller (Naza M Lite) and all are fine and show no signs of corrosion. I have calibrated the Tx to the Naza software. I have checked all switches and controls on the Naza software. I have performed a calibration of the drones compass. Have checked that props are correct.

Yet when i go to lift off the drone still fails to lift off immediately and scuttles across the floor.

I am well and truly lost as what else it could be !!!!!!!!!!!thinking

Biggles' Elder Brother - Moderator16/05/2018 11:15:13
avatar
Moderator
15409 forum posts
1409 photos

Well, it's certianly a poser this one!

OK here's a long shot - you say it "scuttles along the floor? Like it has just hover power but not ascending, lift, power?

Well, if I remember correctly, and its been a while since I used a NAZA-lite, it is one of those controlers that seeks to set hover power to exactly half throttle, so you always know the stick setting for a hover, it's just the middle position. Is there a clue there do we think? Could the Tx only be issuing throttle mid-point, ie zero, or something similar?

Vague I know, but I'm running out of ideas!

BEB

John Payne17/05/2018 08:35:17
avatar
160 forum posts
63 photos

Hi. Just a thought, but a quick Google finds some people who had the same problem and the props were on the wrong motors and therefore not generating enough lift. Check again that the props are on the correct motors and turning the correct way. I know there are two of each direction but perhaps they are on the wrong motors. Sorry if you have already checked this when you say you have checked the props.

John.

Denis Watkins17/05/2018 08:56:15
2899 forum posts
141 photos

Long shot Dave, but if the floor were not there, would the model go down?

Try it outside from a raised surface, is the thrust down?

LHR Dave17/05/2018 13:20:43
avatar
91 forum posts
27 photos
Props definitely on ok , When drone is powered up it struggles to get airborne, but once it is coaxed airborne it appears to fly normally. It's just getting it there that's the problem. Even with the throttle pushed straight to full this still occurs.

All Topics | Latest Posts

Please login to post a reply.

Magazine Locator

Want the latest issue of RCM&E? Use our magazine locator link to find your nearest stockist!

Find RCM&E! 

Latest Forum Posts
Support Our Partners
Gliders Distribution
electricwingman 2017
Slec
CML
Expo Tools 14 July
Airtek Hobbies
Wings & Wheels 2018
Motion RC
Overlander
Advertise With Us
Sarik
Latest "For Sale" Ads
What is the main brand of transmitter you use? (2018)
Q: What is the main brand of transmitter you use?

 FrSky
 Futaba
 Graupner
 HiTec
 Jeti
 JR
 Multiplex
 Spektrum
 Other

Latest Reviews
Digital Back Issues

RCM&E Digital Back Issues

Contact us

Contact us