mvhf
Senior Heliman
Location: Antwerp, Belgium
| I was wondering if someone has a formula to claculate the headspeed of an electric heli.
Since an electric engine can run a stable rpm, it should be possible to calculate it, certainly with a controller which has a governer mode.
I've been trying to figure out a formula but I cannot get it complete.
The parameter which I'm missing is how to claculate the engine rpm.
Or should I install some head speed meter, like the one suggested on another topic (with the cyclo computer), write down the headspeed, do some changes, and then I'll have the formula ?
When I look at technical info from the Site of my engine (a Hacker B50L15 )I get three motorspeeds so I' don't know which one to use
or should I take the middle value, i once mounted my governer of my nitro on the logo 10 to check the headspeed, and it was close to what I get when calculation with the middle value ?
My formula :
Voltage * Rpm/v / Gear Ratio
Cells 12 14
rpm/v 1610 1610
Voltage 14,4 16,8
Rpm 23184 27048
Pinion GearRatio
13 15,38 1506,96 1758,12
15 13,33 1738,80 2028,60
Is my calculation correct ?
So now another quest when you take in account the controller with governer function, what is it doing ? changing the voltage ?
regards
Marc |
I think the GV-1 can measure pulses in the 330hz range. But since your motor is probably at twice that speed you wouldn't be able to measure it off the main gear (Also your pinion is too small to mount a magnet). If you have a constant drive tail, you could place the sensor there and use the tail ratio as the main ratio in the governor. Again, I've never broken down an electic heli but just off the top, this technique seems viable.
