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06-03-2009 06:50 AM  8 years agoPost 1
Gregor99

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Western Wa

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No, not crashed, but benched. 4 minutes into the sixth flight today, there's a noticable drop in headspeed. I've read enough stories here to know that lots of bad things can happen next. I landed with haste and without incident.

On the ground, I gave the once over, checked for temps. Nothing unusual. Tried to spin it up and the rotor only turns half a rotation then stops. Take to the bench, reseat the motor connectors, try another pack, same thing.

ESC is the Align 35x, motor is the HDX 450 3550. I really hope its the $19 motor and not the $54 ESC. Besides, I really like the ESC, and not wild about the motor. But I have neither a spare motor or ESC so I can't swap.

Has anyone tried connecting an voltmeter to an ESC without the motor attached? I did and didn't get much of a reading. So I'm not sure it's a valid test.

Revolectrix Beta Team

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06-03-2009 07:21 AM  8 years agoPost 2
TJinGuy

rrProfessor

Socorro, NM - USA

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Does it spin freely by hand?

I had a tail bearing go on me once and it created a serious drag on things.

- Chris

Team New Mexico
TJinTech

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06-03-2009 07:28 AM  8 years agoPost 3
Gregor99

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Western Wa

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Yup, still spins freely.

Revolectrix Beta Team

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06-03-2009 01:14 PM  8 years agoPost 4
DougsRC

rrProfessor

Mass.

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Sounds like the motor to me Greg, I had a motor all of sudden run at half power. The bearings were good , so I'm not sure what causes a motor to go bad and still run, perhaps a cracked or weak magnet or one of the windings burnt or broken. You could try taking the can off the motor and check the magnets. I had a motor with a magnet that came unglued and moved it's position. I used CA to reglue the magnet in its correct position, it did work but I'm not sure what they use to glue the magnets in place, its probably some kind of industrial adhesive.

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06-03-2009 06:27 PM  8 years agoPost 5
Heli Bob

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Puerto Rico,Carolina

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guys this happend to me to and some times it dosit
http://www.runryder.com/helicopter/t518114p1/

Beam E4(md-500e),Gaui 200,T-Rex 500,E-flight MCX.

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06-03-2009 08:29 PM  8 years agoPost 6
Sgt Heli

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Remlap, Al USA

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Hard to say whats up with that. As you mentioned the motors cost less so maybe try a new motor? Heck I have an spare Esky brushless ESC that your welcome to use for testing. I only ask that you send it back. First class mail doesn't cost much.

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06-03-2009 08:42 PM  8 years agoPost 7
Heli Bob

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Puerto Rico,Carolina

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sgt
did you read the link that i posted in mine case could be the motor the esc is brand new

Beam E4(md-500e),Gaui 200,T-Rex 500,E-flight MCX.

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06-03-2009 10:18 PM  8 years agoPost 8
Sgt Heli

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Remlap, Al USA

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Yes Bobby I read your case. Maybe your motor too big for your ESC or settings? Is it running right now?

Once I have it setup right and all is working well, I fly until it stops working right. Then I start inspecting/swapping stuff out until I find the culprit. I usually Deep 6 the bad part after that.

Recently had a broken wire on the esc's filter/coil. I just resoldered that one and its still good.

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06-03-2009 10:35 PM  8 years agoPost 9
Gregor99

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Western Wa

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Doug, the motor has a press fit ring around the shaft to keep it being openned. I might be able to get it apart, but just as likely could damage the ring or the bearing it sits next to.

Sgt, thanks for the offer, I may take you up on that.

Tonight I think I'll try seeing if I can get a voltmeter reading off my T500's ESC. If I can, then its clearly the HBK2's ESC which is bad. I have a case open with the vendor now to determine warranty status.

Revolectrix Beta Team

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06-03-2009 11:09 PM  8 years agoPost 10
zaw

rrKey Veteran

Lebanon, NH - USA

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You can press the shaft out from the top. I use large deep socket on front of the motor and use a screw from main shaft to press it out with my bench vise. came out pretty easy. then I just press it back in without the socket.

If the magnets moved the motor won't spin freely, it will have very hard notchy feeling.

I have not probe the ESC with DMM but you can check for resistance on the coil, see if they're all the same.

ಠ_ಠ HBK2 built with inexpensive parts! ٩๏̯͡๏)۶ Gaui425

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06-04-2009 01:49 AM  8 years agoPost 11
Heli Bob

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Puerto Rico,Carolina

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SGT

i have a new esc 55amp scorpion and the first couple of flights it didn't do nothing but it started again doing it but i thinks is the radio going to open it to see if some thing lose inside

Beam E4(md-500e),Gaui 200,T-Rex 500,E-flight MCX.

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06-04-2009 05:41 AM  8 years agoPost 12
Gregor99

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Western Wa

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Good News!
Turns out it was my $19 motor that was the culprit. I found my old Esky 3800 motor with 300+ flights on it. Mounted it up and the ESC is working fine. Oddly, the Esky 3800 seems to have quite a bit more punch than the 450 sized HDX 3550. With 170 flights on that HDX, I guess it was on it way out. So its back to the trusty old Esky 3800 again.

Revolectrix Beta Team

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06-04-2009 05:59 AM  8 years agoPost 13
Gregor99

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Western Wa

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Oh, one other thing. I took the motor apart to see if I could find any loose magnets, or any burnt wires. The magnets were fine and the wires seemed to be in good shape.

Revolectrix Beta Team

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06-04-2009 12:25 PM  8 years agoPost 14
DougsRC

rrProfessor

Mass.

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So its back to the trusty old Esky 3800 again.
Thats the one I have always used as well Greg, it is reliable, stays pretty cool. I like the HDX300 motors as well but the one HDX450 I had got steaming hot.

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06-04-2009 12:43 PM  8 years agoPost 15
Heli Bob

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Puerto Rico,Carolina

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so guys in my case what can i do it could be the motor
I took the motor apart to see if I could find any loose magnets, or any burnt wires. The magnets were fine and the wires seemed to be in good shape.
you recomend to take the motor apart

Beam E4(md-500e),Gaui 200,T-Rex 500,E-flight MCX.

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06-04-2009 06:53 PM  8 years agoPost 16
Gregor99

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Western Wa

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Bobby,

Doug had suggested to open the motor and inspect for a magnet coming loose or any burnt wires. You have to be very careful as many motors can be damaged if attempt to open them.

Greg

Revolectrix Beta Team

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06-06-2009 01:30 AM  8 years agoPost 17
Gregor99

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Western Wa

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Got a couple flights on the ol Esky 3800 now. This is the same motor I ran when I bought the kit. I haven't counted flights from the log yet. But if memory serves me correctly, it had over 300 flights on on it when I retired it. Lower bearing was replaced once.

I'm currently running it on an 11t, so roughly 2800 headspeed. What I remember about it is still true. It doesn't feel as crisp as the other motors I've used. But its far more difficult to bog. I ran a 9 minute flight last night and it was quiet, powerful and efficient. But it ended the flight quite warm, 127f. The HDX was giving me 7-8 minute flights and coming down a few degrees above ambient.

So far I actually like it more than the HDX450. For some reason the HDX was way too easy to bog regardless of headspeed, or pinion. Same thing for the Xtreme 400x I was running before it. The Esky 3800 doesn't have the pop of either the HDX or the Xtreme, but it does seem to have the grunt. I need to test it with some flips and loops. Those moves would cause the HDX to bog like crazy.

Revolectrix Beta Team

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06-06-2009 01:36 AM  8 years agoPost 18
DougsRC

rrProfessor

Mass.

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Gregs, If you can't bog the motor, there is only one thing to do bro

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bigger pinion

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06-06-2009 01:42 AM  8 years agoPost 19
Gregor99

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Western Wa

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I don't want to bog the motor Doug. Oh one other odd thing I noticed. With the Esky 3800, the tail blades are now making a kind of raspy sound when you push then. Like a quick CCW piro, and stop. They did it a little with the HDX 450 when I had a 13t, but not much on the 12t, or the 11t. Not sure why the tail would sound different with a different motor. Perhaps its because the 3800 isn't dropping the headspeed as much as the others underload. Dunno.

Revolectrix Beta Team

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06-06-2009 01:51 AM  8 years agoPost 20
DougsRC

rrProfessor

Mass.

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Hell if I know Greg, could you be over-thinking the heli thang I'm not judging, just asking

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