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09-07-2009 12:00 AM  8 years agoPost 1
jutrast

rrApprentice

Henniker, NH

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My Vibe 90 SG has become one of my favorite helis... I've really come to appreciate how smooth it flies, but unfortunately now it makes a horrible rattle from time to time. I'm looking for suggestions on what to look for.

The sound is what you might expect if you left 1/2 dozen bolts loose with the washers rattling around. It comes and goes... sometimes incredibly concerning, other times it goes away entirely.

Here's what i've checked so far:
  1. Taken the muffler (SB-19) off the heli and shook it to check for broken baffles, etc... nothing
  2. Checked EVERY bolt to ensure they are tight, and no dangling washers
  3. Removed the fan shroud, and confirmed the clutch is firmly in place, and the clutch stack has no wabble
  4. Confirmed the gear mesh on main gear/pinion, and tail drive has the right spacing/backlash
  5. Confirmed there is no slop in the main shaft bearings, and no bearing noise there
Suggestions appreciated.
Toby

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09-07-2009 09:50 AM  8 years agoPost 2
RLHeli

rrApprentice

Auckland - New Zealand

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Mine came from starter shaft hitting engine crank shaft. Gone in about 3 flights. Discover this during engine maintenance, saw metal dust after removing clutch and a circular indentation pattern matching the tip of YS 91 SR3C crankshaft.

Also, any chance the fan is not secured enough that crankshaft slipped on the brass centering cones? Above mentioned maintenance was meant to correct this issue, result of hasty assembly... all done in 3 nights

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09-07-2009 10:37 PM  8 years agoPost 3
mdu6

rrKey Veteran

Montreal

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When does the sound comes ?

Engine idling, hovering, Idle-Up ... or all of the above ?

Have you try/look around the usual culprits ?

- Canopy
- Boom brace
- tail control rod
- Other indication of vibration (fuel foaming)
- engine bearings

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09-08-2009 12:36 AM  8 years agoPost 4
jutrast

rrApprentice

Henniker, NH

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Ran it again today, and looked again for signs of the rattling noise.

There are no visable signs of vibration at all, and the heli is still smooth in flight. No wobbling and the fins and exhaust deflector don't have any visible movement.

It happens with the canopy off, and i've literally touched every part while it is running... sometimes I think i've found it as the noise goes away, but always returns. All the control rods are secure, with no visible vibration.

I don't think it is internal in the motor, as it really sounds like dog tags on a chain. I imagine something internal would be more muffled. Perhaps I need to drop the motor to check the clutch/fan stack more carefully.

Suggestions appreciated.

Toby

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09-08-2009 12:56 AM  8 years agoPost 5
FenderBean

rrElite Veteran

Clarksville, TN

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well u could take the heli apart and check everything, the time ur wasting trouble shooting it. I have had this on a raptor 90, it was slop from the front bearings in the engine/plat in drive shaft

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09-08-2009 12:57 AM  8 years agoPost 6
mdu6

rrKey Veteran

Montreal

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Try and be even more "precise" ...

does it happen at Idle ?

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09-08-2009 01:07 AM  8 years agoPost 7
jutrast

rrApprentice

Henniker, NH

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Yes, sorry... it does happen at idle. As a matter of fact, that is when it is most noticable. The noise is rare when the throttle is up.

I'm nearly at that point where I'm going to tear it down... It gets cold here, so maybe a good winter project.

Thanks,
Toby

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09-08-2009 11:24 AM  8 years agoPost 8
mdu6

rrKey Veteran

Montreal

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Ah, then I believe it is just the clutch grabbing at low speed.

Once I start, I can sometime ear a 'ping-ping' sound, if I lower the engine speed, it's gone.

I will do a complete check later this week (my first 20 flights this weekend) - and see if there could be something else causing this.

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09-08-2009 11:35 AM  8 years agoPost 9
Gorgin4325

rrKey Veteran

Florida

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I believe it is just the clutch grabbing at low speed.

Once I start, I can sometime ear a 'ping-ping' sound, if I lower the engine speed, it's gone.
Mine does the exact same thing. I checked, and don't think there is anything I should worry about. Once the RPM goes a bit higher and the clutch engages, sound goes away...

Regards,
G

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09-08-2009 01:40 PM  8 years agoPost 10
Spacey

rrVeteran

Pretoria, South Africa

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You didn't perhaps put the start hex down tight? In other words push the start shaft up all the way into the bell and push the hex down tight also pulling the whole start shaft/clutch assembly together? I had a similar noise on mine in the beginning. I was confused by the part where the manual said the hex shouldn't be pressed down all the way and pulling the start shaft up, as this is not the norm. But yea then literally loosened by hex's grub and pulled the hex up a bit so it frees up the start shaft vertically and the noise was gone.

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09-08-2009 07:55 PM  8 years agoPost 11
James3922

rrApprentice

Scotland

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I had major rattle issues with my Vibe 50. I checked everything and needed a new pinion and bearing but still had a noisy rattle at all engine speeds. I stripped my OS Hyper and found a rough back bearing. New bearings, problem solved.

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10-23-2009 08:15 AM  7 years agoPost 12
JR-ric

rrVeteran

newport news VA

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I had a rattle/pinging sound on my sg. And come to find out once my engine was installed I had to push the engine up so the clutch was in the clutch houseing and it went away

Ricardo Maldonado
Team Curtis Youngblood Enterprise

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10-27-2009 03:21 AM  7 years agoPost 13
DfCicada

rrNovice

Dayton Ohio, USA

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I had a rattle noise as well on my sg.i found mine the hard way, it ended up being the hex head starter adapter. It came off while i was inverted and went through the bladescould be that

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