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HelicopterMain Discussion › Metallic noise and vibration
05-31-2004 08:28 PM  13 years agoPost 1
Dr.Phil

rrApprentice

Oslo, Norway

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Had a couple of flights today, and everything worked great.
The Raptor 50 was working perfectly.
But on the last flight, I noticed some vibrations in idle and in hovering.
When I landed there also was a metallic sound.
The noise and vibration dissapered as soon as I gave more throttle.

When I turn the blades with my hand I still can hear this sound.
Seems to come from the clutch bell.
I am going to remove the TT50 tomorrow to check.
Anybody experienced this, and have any tip for what I should check??


Philip
Rave ENV, Stratus BW,Trex700 V-bar,Furion450
www.airheads.no,Team Hobby24

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05-31-2004 08:33 PM  13 years agoPost 2
Raptor Rulezzz

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Rockanje, Zuid-Holland - The Netherlands

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Anybody experienced this, and have any tip for what I should check??
I did have a bearing cage failure on a TT50... (bearing cage fell apart) and it sounded somewhat like your describtion.

I hope you get it right... after a bearing cage failure, a loose head, A piston falling apart I switched to OS a year ago and never looked back. (I`ve flown the TT for 3 months or so)

Good luck!

Rich



Proud Member of Team QuickUK, Team Duralite & Sponsored by V-blades & 4rc.nl

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05-31-2004 08:56 PM  13 years agoPost 3
heligoole

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yorkshire,uk

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NOT TO BE THE MESSENGER OF DOOM but check it real good...my heli(caliber30)was doing similar..not crashed it in over a year....then i did....good luck....

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05-31-2004 09:32 PM  13 years agoPost 4
TerryG

rrApprentice

So. Daytona, FL

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Broken clutch shoe?

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05-31-2004 10:04 PM  13 years agoPost 5
Dr.Phil

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Oslo, Norway

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Just removed the engine.
The clutch seems fine, but the bell is wobbley.
I'll check everything to see what the problem is


Philip
Rave ENV, Stratus BW,Trex700 V-bar,Furion450
www.airheads.no,Team Hobby24

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06-01-2004 12:31 AM  13 years agoPost 6
donlynn

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New Zealand

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Gidday

The ole WBS wobbly bell syndrome.

black dust on the grey gear?
Mine was also making the noise during approaches to land.
Sorry fella your pinion is most likely knackered where it runs in the lower start shaft frame bearing, you'll need a new pinion, the bearing is probably sweet as.
Just today I'm making a third bearing housing to sit on top of the pinion same as I fitted to my 30v1 as I have just pulled mine and same deal,

My new pinion
1 x PV0380 USD 5.30
(r50v2) is sitting on the table arrived from helikraft this morning.

Regards Don

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06-01-2004 12:45 AM  13 years agoPost 7
Dr.Phil

rrApprentice

Oslo, Norway

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Don, I just put the engine back and there is no more wobbling.
Seems that when I put the Raptor together I fastended the engine on the two lower holes instead of using the top one.
It's corrected now.
Could this be the reason this happened?
Now the clutch bell looks good, but I still hear that sound when I rotate the blades by hand.
And YES, I have black dust on the main gear.

Hmmm. guess I need a new pinion then.
Thanks.

And I finally got everything back together and thought everything would be ok.

I'll do this tomorrow


Philip
Rave ENV, Stratus BW,Trex700 V-bar,Furion450
www.airheads.no,Team Hobby24

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06-04-2004 01:50 PM  13 years agoPost 8
Dr.Phil

rrApprentice

Oslo, Norway

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Just took out the pinion, and it didn't look good at all!!!
A lot of metal was gone.
I now know where the black dust came from

Thanks, Don.
The pinion is replaced, and I am going to test the Raptor today.


Philip
Rave ENV, Stratus BW,Trex700 V-bar,Furion450
www.airheads.no,Team Hobby24

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06-04-2004 02:39 PM  13 years agoPost 9
heli1man

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Chautauqua Lake, NY

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how?

Guys,
how does the metal gear (pinion) get eaten up by the plastic main gear. Just curious.

Bill

Eco 8 Brushless, MS composits Raptor30v2 39TT 550TT carbons Shogun 400 Brushless 3 cell lipo.

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06-04-2004 02:54 PM  13 years agoPost 10
Dexter

rrApprentice

North Wales, UK. Not England.

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As I understand it, the pinion does not get worn away by the main gear, but by the bearing that it runs in. I have a 50v2 suffering from a similar problem!

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06-04-2004 04:06 PM  13 years agoPost 11
donlynn

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New Zealand

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Gidday

First time I saw it was Galifrey I think put up a picture of his , mine looked the same
I rekon it's a ballsup in design, you get what you pay for I guess!
I still like flying it.
I dont think it has anything to do with what mounting holes you use, I use all 6, you can feel the excess as compared to new wobble on removal of the engine when the bell has no lower support.

A local has suggested the pinion to bearing fit isnt as tight as on the v1 , I agree, I used loctite 641 bearing mount on assembly and it has still failed ~180 tanks.

I dont think replacing the pinion will last any longer than the original, The 3rd bearing should limit the sideways movement making for alot less leverage at the pinion bearing.
I've made the 3rd bearing assy out of free turning aluminium that fits between the two start shaft bearings on top of the pinion, almost identical to the 3rd bearing on ricks or heliproz for the v1. I made mine to suit the 6 x 15 x 5 wide bearing to give a little more guts, A bit of a effort getting it to run true but got to within 1.5 thou in the end, a wee hint of loctite 641 at each spot the start shaft makes contact to help minimise fretting.

First flight today, 4 tanks went sweet as !
clutch engagement was just late enuf (virgin bell and shoe assy) clearance ~0.35 mm, fiberglass liner similar stuff to printed circuit board machined from a 10mm thick sheet.

Later engaement would be nice

- do any folks see a problem with the clutch engaging later?

I'm going to try drilling a hole in each moving shoe portion in the same place to see if it will delay the speed of engagment as it would be nice if it was alittle later, I'll start with a ~3mm hole.

Regards Don

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