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Motor slows down when I try to throttle up!

Old 03-16-2019, 03:58 PM
  #1  
rostaclot
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Question Motor slows down when I try to throttle up!

Hello,
I am a big noob with RC drone stuff. I am working on a project that is focusing on making a thrust vectoring drone. Very similar to this one:



I am using: EDF Ducted Fan Unit 7Blade 127mm (5inch)
Scorpion HKIV 4035-560 Brushless Motor
2 x Venom Fly 30C 6s 5400mAh 22.2V LiPo Batteries
Turnigy 100A Superbrain ESC
Flysky Reciever FS-A8S

Problem: https://imgur.com/a/k2CwoBW

During my thrust test, it seemed that the RPM of the blades was limited. It peaked at 4.2 kg and then dipped. Now the motor seems to slow down even when I try to apply higher throttle. Not seemed too hot or damaged. Any advice?
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Old 03-17-2019, 02:56 AM
  #2  
ron_van_sommeren
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Motor Kv? (says absolutely nothing about motor max. power).

Voltage fresh from the charger, before flying?
What charger, settings?

What were measured current and rpm at wide open throttle?
Measured voltage sag at WOT?

Since you're a newbie:
Radio, ESC, motors, current, power, capicty, SBEC/LBEC, LVC, Kv, C, LiPo's etc.etc. explained ...
  • Some well-structured reading for rainy/windy days, and some handy e-tools as well. Will save you, and us a lot of questions. Notably the 'what went wrong?' kind of questions Will also prevent you from burning up several controllers and/or motors and/or battery:
    E-flight primer and tools
    .
  • And pleasepleaseplease, do your RC equipment, wallet, ego, battery, controller, motor, house/garage/car a big favour ... get a watt-meter. It will more than pay for itself, will save you at least one fried motor and one fried controller. Will also help you finding optimal setup.
    .
  • Without a watt-meter you are in the dark. Until something starts to glow
    Very versatile, and (now) dirtcheap:
    close out sale Hyperion Emeter II - RCG, with optical and electrical tach, servo tester, local&remote logging.
Prettig weekend Ron
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Old 03-17-2019, 03:04 AM
  #3  
ron_van_sommeren
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Since you're a big noob, why not learn the e-ropes with a proven design?

An EDF, unlike propellors, is designed for high rpm in high airspeed jets. Drones/multicopers are not high speed.

Multicopter and EDF calculators
www.ecalc.ch (lots of languages.
www.ecalc.ch/xcoptercalc.php
www.ecalc.ch/fancalc.php

Last edited by ron_van_sommeren; 03-17-2019 at 03:22 AM.
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