FMS PC-21 Pilatus 3541 750kv Brushless Motor Bench Test [The Judge Ep. 7]
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- Опубликовано: 9 апр 2020
- Before I put the FMS PC-21 Pilatus together, I just had to take that big 10x7 5 Bladed Prop for a spin on The Judge.
No big surprises--but the sound of that prop is very unique. 
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![Efficiency Champ? Sunnysky x2820 800kv Brushless Motor [The Judge Ep. 6]](http://i.ytimg.com/vi/Ilsh_ulJWrc/mqdefault.jpg)
![Efficiency Champ? Sunnysky x2820 800kv Brushless Motor [The Judge Ep. 6]](/img/tr.png)
lol I would have bet on you doing it its in you to test lol
And I totally agree on ESC it sad hen they bring them to edge of fail 50 amp more then enough
Take Care john great video
Yeah, 50a is the right answer for this power setup.
I have flown this PC 21 stock for four years now and have had absolutely NO problems with the 40 amp ESC!!!!!!
GOOD NEWS!!!!!!!! I wonder if you fly in 100 degree heat and as hard and fast as I do?
A really interesting test. Thanks for posting.
You're welcome. Before I bought the plane I saw a few comments that it was severly underpowered. I knew from first hand observation that wasn't true. I mainly posted these results so people could see the truth. 191w/lb is strong. 1.7:1 power to weight is pretty strong although I will start keeping that number in mind as I document results as another reference point.
@@RCVideoReviews I have had my eye on this one for a while, but held off due to forum comments that it was lacking in power. I'm not bothered about outright speed but do want reasonable vertical performance, so will be following your flight reviews with interest!! I haven't picked up on any forum comments that the ESC is unable to cope with the amp draw so all should be well there.
@@michaelcuthbert6956 I've already ordered a 60a replacement. I live in Florida and it can get very hot. I'll admit this is borderline but it's a nice plane and I don't want to risk it. Besides, it seems pretty universal the plane needs weight on the nose to make the CG without moving the battery very far foward. So the 60a ESC will give me headroom and something other than dead weight up front.
The Vanquish with the SK3 and 11x6 had very strong vertical performance. Given the power to weight on this plane is slightly lower, I don't expect it to be unlimited vertical but it should be strong.
I'll try and remember to do some vertical climb testing on the maiden for you.
@@RCVideoReviews Yes, better to be safe than sorry in warmer conditions. I too have some larger ESC's that would add some 'useful' weight up front. Thanks for looking at doing some vertical climb testing that's very much appreciated.
Thanks again another good interesting video
You're welcome. I know bench tests aren't as exciting as flying or planes, but this is good information to have documented. The plane seems popular so it's good info to have out there.
I agree with you. Static and Dynamic are quite different, but headroom is headroom. A little headroom is always usefully needed. My 4s 3D Pitts came with a 50a ESC. Long story short, it now uses a Mantis 65a/5.5v SBEC ESC. A little larger ESC, no matter what, never hurts a thing. AirHammer out!!
Right on.
Great tip on how to source a motor for less money!
It's surprising how inexpensive some of the replacement motors can be. I think the Hobbyking EfXtra replacement motor is dirt cheap and that little sucker screams.
I know this video is over a year old.. Did anyone ever test this motor and prop combination with 5 Cell battery? My tests show just over 58A and 1050W at static wide open throttle.. I doubt this motor would take that constantly but for short bursts (10-15 seconds) should be OK??
Hi John,
Did you make a test with the spinner to check how the spinner runs?
I haven't yet. Since it's mounted on the stand, I may as well go ahead and do that. FYI: I believe the primary issue with those spinners is the backplate being out of round. I'll let you know what I find out.
I would say that setup needs a 60a esc minimum. Even running close to ratings is asking for trouble. I personally like at least a 25% margin.
Man after my own heart. Right there with you.
What’s the size of this motor I can’t find it anywhere
Seriously?
Do you think this motor can handle 5s? Given an upgraded ESC?
The only way to know is to put it on a watt meter. My suspicion--especially if you used this 5 blade prop--is 5s would be too much. The only way to know is to test though.
I just got the Pilatus :-) On 4s I got a similar number to John's, with a peak of 44.6 amps. On a 5s battery it peaked at 58.9 amps. Will the motor handle this? There are no ratings available but comments on RCGroups suggest it will so I plan to give 5s a try with an upgraded ESC. As long as the throttle is moderated and only hit full on for short periods I expect it will be OK.
Does this motor have 14 poles?
I don't know, I sold the plane so I can't check.
would you try some other prop on it?
Probably not.
1) As a 5 bladed prop, it would take something with at least 3" more diameter to produce a 2 bladed equivalent which wouldn't work on this airframe.
2) I really really like the way this 5 bladed prop sounds on the plane.
3) I would have to disassemble the plane to put the motor back on the test stand.
What are you trying to figure out?
@@RCVideoReviews Thanks alot for taking time to answer, i was curious about the efficiancy aspect. I was just curious about what sort of a performance drop the increased blade nummer was caising... it sounds great though :) (PS: I am just a newbie starting the hobby . Sources like www.drivecalc.de abit too complicated for me to grasp the mechanics of propellers )
@@RCVideoReviews I simply admire your content, enjoy the PC 21:)