EDF/Fan Balancing

[ss0028]

Do edf motor combos like http://www.motionrc.com/freewing-64mm-12-blade-edf-4s-power-system-w-2836-3500kv-motor/ come pre-balanced?


Thanks,
Sam

[The Huff]

RE: EDF/Fan Balancing

I purchased this fan motor combo for my Stinger 64 and it was well balanced right outta the
box. Getting 2.7lbs of thrust ( static measurement on an RC Lander edf test stand ) with an
Admiral Pro 4s2200mah 45c battery. The model weights 1.65 lbs with battery so you can imagine,
she's a beast !
Make sure you use an esc rated at least 65amps for that motor/fan combo.
The whoosh is awesome in flight ... no high pitch, low blade count, edf wail ;)

[ss0028]

RE: EDF/Fan Balancing

I purchased this fan motor combo for my Stinger 64 and it was well balanced right outta the
box. Getting 2.7lbs of thrust ( static measurement on an RC Lander edf test stand ) with an
Admiral Pro 4s2200mah 45c battery. The model weights 1.65 lbs with battery so you can imagine,
she's a beast !
Make sure you use an esc rated at least 65amps for that motor/fan combo.
The whoosh is awesome in flight ... no high pitch, low blade count, edf wail ;)

OK thanks, you also posted on my battery post for the stinger 64, I got the new battery yesterday, and what do you know happens, when making a speed pass with a negative pitch and going at least 95mph one cell in the battery completely burns out and causes the whole plane to crash and be totaled. The fuselage is beyond repair, the wing snapped, the elevator tab broke completely off and couldn't be found, and the cell in the battery short circuited and burned out my receiver and all the servos. It wasn't a motion battery is was thunder power. The man from thunder on the phone was very nice and is checking with his boss to see if they can replace the battery and give me some money back due to the plane.

Thanks
Sam

[Konrad]

RE: EDF/Fan Balancing

I assume you are asking about dynamic balancing (dual plane). I doubt that these are dynamically balanced as it takes me about 5 minutes to dynamically balance my rotating group. I'd think that if they were the OEMs would be making a strong point in their sale literature if they were spending any time and money to dynamically balance these. I doubt they actually even statically (single plane) balance these.

So some might actually be in balance out of the box but I wouldn't count on it.

All the best,
Konrad

[The Huff]

RE: EDF/Fan Balancing

As I stated, my fan runs smoothly, so I may have got lucky. I also stated in my reply in your other
thread that RCgroups has some excellent threads discussing how to dynamically balance your
fan/motor combination so there is no need to do so here in this thread. Go to RCgroups.com and
search " edf dynamic balance ".
If your fan is way out of balance it is usually quite obvious due to noise/vibration.
Sorry to hear you got a bad pack from the OEM and had a crash. I does happen. It's great that
Thunderpower is going to compensate you (hopefully). A lot of suppliers would not even discuss
compensation.

[Konrad]

RE: EDF/Fan Balancing

RCGroups is notorious for suppressing ideas. So it is often best to repost relevant information here or on any forum site.

All the best,
Konrad

[The Huff]

RE: EDF/Fan Balancing

Plenty of threads regarding fan balancing :

https://www.google.com/search?q=how+to+dynamically+balance+an+edf+fan+sit e:www.rcgroups.com&cad=h