# PX4, single motor (fixed-wing), power from 0 to 100 in 30% of the throttle range **URL:** \ **Category:** PX4 Autopilot\ **Created:** [July 19, 2024, 4:16pm UTC](https://discuss.px4.io/t/px4-single-motor-fixed-wing-power-from-0-to-100-in-30-of-the-throttle-range/39782 "2024-07-19T16:16:57Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![covelus](https://discuss.px4.io/user_avatar/discuss.px4.io/covelus/32/16353_2.png) [@covelus](https://discuss.px4.io/u/covelus)\ **Post date:** [July 19, 2024, 4:16pm UTC](https://discuss.px4.io/t/px4-single-motor-fixed-wing-power-from-0-to-100-in-30-of-the-throttle-range/39782/1 "2024-07-19T16:16:57Z")
Hello, I’ve PX4 v.1.14.3 on a fixed-wing with a single motor (which I never had used before). I calibrated the ESC, but the issue is that the power goes very quickly from 0 to a fixed speed (max motor speed I assume), and this happens both in QQroundControl and in the RC transmitter’s throttle stick, in a very short move… It starts rotating at approximately 20% of the stick (pic 1 below, also, this is also weird, at 15% it does nothing), and it reaches the max speed at about 50% (pic 2 below), so, only 30% of the total move to control the motor, I think it cannot be right. 20%, it starts rotating, below here, no rotating: ![image](https://discuss.px4.io/uploads/default/original/3X/d/3/d3114ed7023128ef2d928219d5b6578bbd27fb05.png) 50%, probably high speed, above here, no changes: ![image](https://discuss.px4.io/uploads/default/original/3X/e/a/ea5fb951708465125876747d76088da5bd193c41.png) I tried to tune some parameters, as PWM\_MAIN\_MAX, PWM\_MAIN\_MIN and FW\_THR\_SLEW\_MAX, but I couldn’t get better results… ![image](https://discuss.px4.io/uploads/default/original/3X/e/d/ed96b589529b9a128d3359747d426ea3f0ff3b0b.png) Do you have some idea about what it could be happening, and which parameters I could adjust, or if there’s some tuning guide somewhere, please? Thanks a lot