tnh
Flying officer
Posts: 3
|
Post by tnh on Mar 25, 2012 5:08:03 GMT 1
I have everything except the motor. I just need a motor to fit in the stock mount. I am already running the spektrum radio and I have ESC's here. I just thought it would be easier to fit a motor in the stock mount instead of buying a different mount and then having to figure out the angle. What kv would be suitable? I know it would have to be higher than an outrunner because of the gearing.
|
|
|
|
Post by flydiver on Mar 25, 2012 6:27:23 GMT 1
Anything around 2000-2500 should work. I 'think' the original is ~2200.
If you have a wattmeter to sort out gearing and amp draw that would be a huge benefit and allow a lot of flexibility in the actual KV.
|
|
tnh
Flying officer
Posts: 3
|
Post by tnh on Mar 25, 2012 20:09:46 GMT 1
Thanks, that was exactly what I was looking for. I do have a watt meter.
|
|
|
|
Post by rivergreenmachine on Mar 25, 2012 23:20:36 GMT 1
I have a 30A ESC from an Art-Tech Cessna 182 that was given to me. The parts in the box included an 8.4v battery, but no motor.
How do I know if the ESC is for brushed motor or brushless motor?
I ran the part number (EESCA130A002) thru Google search. No help.
Also, can the same ESC be used for 8.4v or 11.1v?
|
|
|
|
Post by flydiver on Mar 26, 2012 4:41:58 GMT 1
brushed=2 motor wires
brushless=3 motor wires
No telling on many RTF stuff unless they list the specs, which they seldom do. That's why it pays to get away from that kind of stuff.
In general, for decent ESC they will work with either 2S or 3S IF they are brushless and lipo oriented. Most of the brushed ESC have NIXX-based LVC which can be a problem.
Some will auto-detect the voltage, some need programming.
For ESC it pays in the long run to learn what the options are so you know if you want/need them. Then you can read the specs and understand them. There are some pretty poor ESC out there.
|
|
|
|
Post by rivergreenmachine on Mar 26, 2012 13:59:57 GMT 1
Once again, thank you Flydiver.
The ESC I have in hand is a 2 wire, so the 182 must have had a Brushed motor. That wasn't what I was hoping to find!
|
|
|
|
Post by flydiver on Mar 26, 2012 15:30:18 GMT 1
On a brushed motor the ESC controls only the throttle > electrical pulses called PWM (pulse width modulation) to the motor. The brushes control the spin.
For brushless the ESC needs to control BOTH the spin and the throttle. That's what the extra wire if for. 1 wire acts as a positional sensor, the other 2 apply power pulses to the stator. The motor moves over 1 magnetic phase, and the wires switch positions. This happens incredibly rapidly of course.
The ESC is not a rheostat. It does not vary voltage. It turns it on and off extremely rapidly (PWM). 1/2 throttle is not half voltage, it's full voltage 50% of the time pulsed on and off extremely rapidly. That's why you don't get an ESC that is too small but think you can still use it by never turning the throttle up too much. The ESC will always see full voltage.
|
|
|
|
Post by larkshead on Mar 28, 2012 18:14:58 GMT 1
Just a quick update: I ordered gagallagher04401's parts list from Page 1 of this thread. HeadsUpRC got everything to me in a couple of days. Cheap quality at a cheap price - exactly what I was looking for.
It works great! There's no looking back now!
However - the 10X6 props that I got from HeadsUpRC seem a little brittle. I've broken a couple under conditions that I believe the stock props would have survived (low or no-power tip-overs). Is there a "softer" 10X6 that someone can recommend?
regards,
-Peter
|
|
|
|
Post by flydiver on Mar 28, 2012 18:44:56 GMT 1
At that power and RPM you don't want something softer. You start pushing the RPM limits (yes, they exist) of weaker props and risk full power breakage. The GWS slow fly props are notable for that problem, they are pretty weak. The GWS 10x6 is NOT a slow fly.
Look through the list of 'shorter/other' props in HURC for that motor and try some. The GWS 9x5 would be shorter, less likely to break but you give up some power. The 9x5x3 might be an interesting option.
Got bigger tires-much bigger? That helps tip-overs a lot.
|
|
|
|
Post by larkshead on Mar 29, 2012 4:45:21 GMT 1
Thanks, flydiver. I'll check out those prop options.
I've already bumped the tires up to 2.5" foam, but I don't think 6" tires would have helped on that particular field.
|
|
|
|
Post by flydiver on Mar 29, 2012 6:04:39 GMT 1
Make sure you have the ESC brake off so the prop can push out of the way.
About the only time the brake is usually used is for gliders to stop the prop.
|
|
