cathal

Hi for my master thesis aviation engineering at VUB. I have to make a test bench for scaled blades of a helicopter.
I'm using a Turingy 500 H3126 brushless outrunner 1300KV with 600mm blades. To be able to test for longer periods i have installed a DC power supply in stead of a battery (the helicopter is mounted to a test bench). The supply has a rated current of 60 amps and a max voltage of 14V. In theory this should be enough to power the helicopter, but when i increase the angle of the blades, the rpm decreases. So my question is; where is the problem? And could the ESC have anything to do with it? I use a red brick 70 amps.
Could anyone help me?

kind regards

Cathal

etpompea

Looking at the spec's for this motor shows that it's rated for 6 cells (22.2v) which is what it would normally run in a 500 size heli. Also, in a 500 size heli you would normally run 425-430mm blades. By using only 14v and 600mm blades you are overloading the motor/esc. No wonder the rpm decreases as you add pitch. You need to run more voltage (22v) and less load (425mm blades) otherwise you're going to smoke the motor/esc. Also, watch your pinion size. Too large a pinion will also up the current draw. You should get a wattmeter which you can plug in between whatever power supply you're using and the esc. This will tell you what your amp/watt draw is.

Ed

cathal

thanks!