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Home✈️Aircraft🚁HelicopterSynergy R/CSynergy N5 › N5 Starter shaft question
04-27-2011 01:20 AM  10 years ago
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V-22 Osprey

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Sidney, Maine

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N5 Starter shaft question
I picked up two used N5s last week from different sellers. After pulling them apart and checking things out I found the hollow end of the starter shafts broken. One had a Rossi motor and the other an OS 55, neither motor had mount shims but both look to have washers under the fan hub...if that matters. Seems like an alignment issue but I'm not sure how to address it. After checking Matt's build tips I'm still not really sure what to do. I installed the OS 55 per Matt and its really hard to tell if it centered. I made a small go or no-go gauge to slide in between the clutch and clutch bell to get an idea of whats what. Anyway, forward and aft are pretty close but side to side is off a little. I don't see any adjustment for this other than sanding down the clutch bearing block just a touch. Do you think this could be the issue? I trued up the ends of the starter shafts and although its a little shorter and not engaging the full length of the oneway bearing it seems to work fine. I assume it been flown like this for a while as neither seller had issues. Is this a common issue? Should the shafts be replaced? Is there a better way to center the motor? Thanks!

Kelly
"220-221 whatever it takes"
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04-27-2011 02:12 AM  10 years ago
thenewguy

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Corvallis, Oregon Where there is liquid sunshine!

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On the O.S. 55 you should be running the shims. Not sure about the Rossi motor.

I would also replace the shaft to make sure the bearing has all it needs to make contact when starting the motor.

One thing I look at to align the motor is you can see the bottom of the clutch and the clutch bell. Make sure they are even on both sides.
You can adjust this by loosening the outside motor mount screws, this will allow the motor to tip forward or back a very slight amount.

Making sure the alignment is correct will help out in several areas. The starter shaft will not be dragging through out the flight. Allowing more performance out of the motor. Plus it helps rule out another area for vibration issues on Nitro motors.

Just my thoughts. Hope this helps.

Thanks,
Chris

"220-221 whatever it takes" I love this old Mr Mom saying. To funny!
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04-27-2011 06:19 PM  10 years ago
V-22 Osprey

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Sidney, Maine

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It sounds like not using the shims on the OS or the Rossi may have caused the damage. I hope this is the case. Just seemed odd, two different builders with the same damage to both helicopters. Thanks for the help!

Anyone know what the clutch to clutch liner gap should be?

Thanks, Kelly
"220-221 whatever it takes"
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04-27-2011 09:23 PM  10 years ago
thenewguy

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Corvallis, Oregon Where there is liquid sunshine!

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I don't know exactly what the gap should be, but the rule of thumb to set proper gab has been 1 to 2 wraps of electrical tape around the clutch.

Are you gluing in a new clutch liner? If so where is what I do.

Make sure the liner fits proper into the clutch bell. Take your clutch and wrap it twice around with electrical tape. Make sure before you glue the liner in the clutch bell that the clutch with the electrical tape will fit snug into the clutch bell with the liner in place. Glue the liner into the clutch bell, then push the clutch into the clutch bell while the tape is on. Let the glue set up then pull the clutch out. This should set the gap just fine.

There are several write ups on this here on the forums. Do a search and see how others are doing before you attempt it.

Thanks,
Chris
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