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HelicopterAlignOther › 600N sport belt hitting the boom?
08-12-2007 02:26 PM  10 years agoPost 1
ev0l

rrApprentice

Kansas City Missouri

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TT2 and I maidened my 600N yesterday and fixed quite a few bugs, Got 3 flights in anyway.

One thing we could not figure out in it seems like there is a ringing sound coming from the tail boom. My belt I think is even a little on the tight side, but I'm guessing the belt is hitting the inside of the boom making this sound. There is some slight tail vibration but it seems to smooth out in higher RPMs. Under hard collective input the sound becomes more pronounced.

Anyone else have this issue? I find this quite annoying almost to the point of ordering a Torque Tube setup.

-Aaron

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08-12-2007 04:06 PM  10 years agoPost 2
The Old Guy

rrVeteran

UK Surrey

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Are you sure you have not got an Extra twist in the belt?

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08-12-2007 04:14 PM  10 years agoPost 3
pitch black

rrApprentice

Singapore

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I get it too.

Im sure i don't have the extra twist in the belt, and i cant tighten the belt anymore.

Thanx!

Slope Soaring not a Crime

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08-12-2007 04:18 PM  10 years agoPost 4
DAT

rrNovice

Puyallup, WA

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Just wanted to let you know that I have been fighting a tinny sound on my sport also. I was at local fun fly that Jason Krause attended and he told me to tighten the belt tighter. Well all this did was make the tail vibrate like crazy and I was afraid I would bind something of wear bearings. Everyone was saying that it was the belt.

I went over and talked to another friend at the FF that has 2 600N. Both pro versions. The funny thing was he had a similar noise. He asked if I was running an OS50. The reason he asked was because he was running a YS50 in one bird.( No noise )In the other was the OS50.
He found that the OS50 crank was longer then the YS50. So his theory was that the crank was rubbing on the clutch bell causing the noise.

Gaining this knowledge I was willing to try anything after chasing this noise for 2 days. I ground 2 threads off of the crank of my brand new OS50 and the noise was vertually gone. I do hear a slight noise but plan on taking another few threads off.

This is a list of the things we tried before ending up grinding the crank.

Belt tension at 3 different tightness
Bought a new motor
Put a MP2 muffler on instead of the MP5 that was on it.
The next thing I was going to do was put the stock fan back on.
Was minutes away from buying the Torque tube but now fell this still would not have fixed the problem.

All that said this would only help if we had the same noise but it is something that only takes about 30min and does not cost $105 like the torque tube.

good luck with your noise.

Dale

If I don't crash, I'm not trying hard enough.

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08-12-2007 05:32 PM  10 years agoPost 5
aliensil

rrApprentice

Laredo Tx

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I don´t have a 600N yet but I fly raptors and calibers, both with timing belts, if you hear a ding ding sound at the beginning and end of flying is totally normal, don't over or under tighten the belt too much, just firm tight that let you push the belt a couple of milimeters and don't tension the tailboom with the boom supports in place, do first with boom and place the supports later, that way you assure your boom aren't bented by tight supports and consecuent internal belt noises.

If you overtighten the belt (even if Jason says die hard tighten) sooner or later you can cause wear on pinions, gears and bearings and blocks due to opposite forces acting on all, you could feel it too a rotor head too tight to hand rotate instead if freely spin.

Flying pigs 8,000 feet above Sea level

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08-14-2007 04:15 AM  10 years agoPost 6
ev0l

rrApprentice

Kansas City Missouri

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well Im beginning to have my doubts, I started my rig tonight to test for blow by, and while holding the blades with no tail rotation at all I get the ringing.

For the life of me I dont understand how it could be the crank on the clutch bell. the crank is well below the fan mount on mine, I just dont see how it could hit anything. I have my suspicion that my aluminum fan is hitting the shroud or something of the like. Testing goes on.

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08-14-2007 04:42 AM  10 years agoPost 7
DANNY WENZEL

rrApprentice

New Orleans . La, ​USA

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yes check the shroud to see if the fan is hitting on it.Pull the motor down and push the shroud up ...............

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08-14-2007 08:29 AM  10 years agoPost 8
Filby

rrApprentice

Adelaide, South​Australia

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How can the crank shaft hit on the clutch bell when the crank shaft of an OS50 doesn't even come past the end clutch shoe? Or are you talking about the crankshaft hitting the starter shaft?

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08-14-2007 10:05 AM  10 years agoPost 9
TT2

rrApprentice

Nakhonsawan Thailand

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My money is on the fan hitting the shroud. I just 'pinged' another 3DX fan that I have sitting here waiting to go into 600NPro #2. It's pitch matches the pitch of the 'ding' that was coming from ev0l's bird.

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HelicopterAlignOther › 600N sport belt hitting the boom?
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