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Other › Brushless motor broke after crash?
12-02-2005 04:55 AM  12 years agoPost 1
akerkhof

rrApprentice

Indianapolis, IN

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I have a brushless seperates HB-CP2 setup, with a himax 3600 motor. I had a minor crash this weekend. I was at an indoor fly in an aircraft hanger, and I was dialing in my heli and doing some forward flight. I sent it out ok, but turning her around and bringing her back I got disoriented (I was running without the canopy on, and I couldn't tell from that far away what the tail was doing). I shut down the motor about two feet in the air because I was afraid I was going to hit the walls, so the heli came down in its training gear and popped off the rear rotor before sliding to a halt, again upright on its training gear. Didn't even do any blade damage, everything else looked ok. I was going to fly again, except it threw the tail gear underneath this big hanger door and it fell down the track where I couldn't get it.

So today I get my tail gear from mail order, and I put it on, and start to spin it up. A screetching noise came from the motor so I shut it down. I look at it, and the shaft has dropped out of the motor to the point that the pinion no longer contacted the gear.

My question is twofold: Am I completely boned here, or can this thing be repaired? I don't see any obvious way to get into this motor to check it out, and I don't want to start experimenting with ways until I know something can even be done. I don't know how the secure the shaft to the bearings, but there is nothing loose rattling inside the motor, and if I just run it on the bench it work just fine. Put it under load and the shaft pops right out.

Second question: If it can't be repaired, are brushless motors this fragile, or have I experienced something very rare? TIA!

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12-02-2005 03:04 PM  12 years agoPost 2
akerkhof

rrApprentice

Indianapolis, IN

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Well, since I have nothing to lose, I'm going to try to red locktite the shaft back onto the bearings. I'll let you know how this goes. I found a website in japanese about a guy who was scale flying with a big brushless, and he had a similar failure. He took his engine apart by prying the end cap off and actually epoxied the bearings to the shaft, with good results. We'll see.

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12-03-2005 12:31 AM  12 years agoPost 3
skypup

rrVeteran

San Antonio, Texas

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I had a hi max in a heli and had similar problems. Mine didn't last long. I now run a chili pepper 36 kv motor from another project. I personally would not buy another hi max after my incident.

SKYPUP

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12-03-2005 03:30 AM  12 years agoPost 4
akerkhof

rrApprentice

Indianapolis, IN

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Well, good news! I just went out there and pushed the shaft around, and it looks like its holding in the bearings pretty good. I then hooked it up to the speed controller and ran it for several minutes. Nothing was bound up, sounded good, the shaft didn't move. Tomorrow morning I'll install it in the heli and see what happens.

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12-04-2005 03:21 AM  12 years agoPost 5
akerkhof

rrApprentice

Indianapolis, IN

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Update: the fix worked perfectly. I just hovered out a pack and the shaft stayed where it was supposed to. This saved my over $100 as I was able to recover to motors this way.

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