FPV250 Quad with multiwii pro lift off issue

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tkumars
Posts: 1
Joined: Thu Jan 15, 2015 11:47 pm

FPV250 Quad with multiwii pro lift off issue

Post by tkumars »

My setup :
1 x FPV250 frame kit http://www.hobbyking.com/hobbyking/store/__52863__HobbyKing_Spec_FPV250_V2_Quad_Copter_ARF_Combo_Kit_Mini_Sized_FPV_Multi_Rotor_ARF_.html
4 x Multistar 1704 Motors (updated shafts)
1 x Battery 1000mAh Turnigy 11.1V (3s LiPoly)
4 x Propellers 5x3x3in 2 green 2 black (CW and CCW)
4 x Afro V3 12A ESCs (Simionk)
1 x Power distribution Lead with Mini JST
Multiwii Pro 2.2 with MTK GPS
http://www.hobbyking.com/hobbyking/store/__26588__MultiWii_PRO_Flight_Controller_w_MTK_GPS_Module.html?strSearch=multiwii%20pro
I have calibrated ACC , MAG , ESC multiple times .
It lift off only 0.5 meters even at max throttle and struggles to retain altitude. Any idea whats the issue
.

Build Image : Image

My config :

Code: Select all

#define QUADX
#define MINTHROTTLE 1150
#define MAXTHROTTLE 1850
#define MINCOMMAND  1000
#define MINCHECK 1100
#define MAXCHECK 1845
#define I2C_SPEED 100000L
#define FFIMUv2
#define MAG_DECLINIATION  -0.96f
//#define MOTOR_STOP
#define MIDRC 1500
#define ESC_CALIB_LOW  MINCOMMAND
#define ESC_CALIB_HIGH 2000
//#define ESC_CALIB_CANNOT_FLY  // uncomment to activate
//#define SUPPRESS_BARO_ALTHOLD
 #define DEADBAND 6
 //#define ALT_HOLD_THROTTLE_NEUTRAL_ZONE 40
#define ALTHOLD_FAST_THROTTLE_CHANGE
#define FAILSAFE                                // uncomment  to activate the failsafe function
#define FAILSAFE_DELAY     30                     // Guard time for failsafe activation after signal lost. 1 step = 0.1sec - 1sec in example
#define FAILSAFE_OFF_DELAY 1000                    // Time for Landing before motors stop in 0.1sec. 1 step = 0.1sec - 20sec in example
#define FAILSAFE_THROTTLE  (MINTHROTTLE + 200)

waltr
Posts: 733
Joined: Wed Jan 22, 2014 3:21 pm
Location: Near Philadelphia, Pennsyvania, USA

Re: FPV250 Quad with multiwii pro lift off issue

Post by waltr »

What is the AUW (total flight weight)?
It looks too heavy for those motors and props and a 3S battery.

Read the comments here:
http://www.hobbyking.com/hobbyking/stor ... unner.html
And note that one person measured the thrust at 100g with a GF503. That means the copter's max weight should be about 200grams as the max thrust is about 400grams.

I'll guess your copter weights close to 600 grams. With a 3S battery this means you need an 1806-2300kv or 2204-2300kv motors as a minimum.

Arakon
Posts: 196
Joined: Thu Jul 17, 2014 2:22 pm

Re: FPV250 Quad with multiwii pro lift off issue

Post by Arakon »

Get rid of the prop guards, that alone will probably save 80g or so.

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