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HomeAircraftHelicopterMain Discussion › You did what?
02-12-2006 04:17 PM  12 years agoPost 1
raptorapture

rrApprentice

Singapore

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I super dumb thumbed it!

After doing a range check went back to heli, started it up and whoa! went into hovering speed right there on the ground. Pinched fuel line after trying to figure out what was going on (yes, gripping blades really tight!) which included dropping throttle stick which was already down, no luck there. Turned off receiver and low and behold, servos started making noise. It appears that I must have dumb thumbed it by turning off receiver (using my thumb of course) after doing range check which didn't include returning throttle to idle position!

Now for the bad news. Tried starting it up again, throttle now worked ok; however, there was a rattling noise inside somewhere. Turned out to be clutch related as touching that would vary the sound. Much clutch powder all over fuel tank. Additionally, the starter shaft was spinning after removing starter and made a squeaking sound when turned manually after shutting engine off. Tried to fly a bit, dumb idea but I really wanted to do a loop today, as I managed to get starter shaft to stop spinning. It took off ok but after a few seconds engine starting revving which must have been me giving more throttle as the clutch was slipping! Anyway, brought it down and home.

Now for the repair. It has been 2 years since I built my R50 and looking at the manual, I'm wondering if I really have to break it all down to get at the starting shaft and at the clutch. What would you recommend (for those willing to pipe up) I repair/replace. I know there will be a need to check various parts and take it from there, but which parts generally would need replacing? Also, not sure how far to go, eg. do I just replace the liner (sounds like delicate affair) for the clutch, if all else is ok, or get a whole new assembly?

Thanks for any help.

Geoff.

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02-12-2006 04:20 PM  12 years agoPost 2
ESWLFSE

rrElite Veteran

Liberty Hill, TX

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I'd replace the clutch and reline the old one later to keep as a spare in case something like this happens again. If its the first time you've been in there in 2 years I would replace the bearings too.

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02-12-2006 04:43 PM  12 years agoPost 3
raptorapture

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Singapore

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Replace bearings?
Thanks Altimat!

Just a quick follow up. I have only flown 1.5 gallons on the R50. Would you still recommend replacing the bearings? Also, what about the squeaking noise on the starter shaft? Any idea which part that might require replacing? My guess is that the starter jammed the shaft when the engine suddenly engaged quickly.

Geoff.

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02-12-2006 05:47 PM  12 years agoPost 4
ESWLFSE

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Liberty Hill, TX

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Only 1.5 gallons in 2 years? They may be fine. Not sure about the squeaking. You'll have to take it all apart and check it out.

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02-12-2006 06:07 PM  12 years agoPost 5
Rcer22

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Somewhere In The Adirondack Mountains

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If it's been two years that you had this ship and haven't done anything to it it's time to at least oil all the bearings in the heli.
As for the clutch and drum if you saw all the powder that you say you did then the clutch will most likely slip. When the lining wears too much the clutch opens up and then becomes over stressed. A good way to tell if the clutch is still good is to look at the slits in it and if they are the same all the way along the chances are it is ok. Also it's time to check the fuel tank and possibly change the pickup inside. When the line inside the tank gets old it becomes brittle and cracks.

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02-15-2006 03:28 PM  12 years agoPost 6
raptorapture

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Singapore

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Clutch replacement
Checked clutch slits, are 1.8mm and 1.95mm at each end for the more open looking one. Looks slightly opened. Sounds like I should replace that too. The fan etc. should be ok? Really kicking myself now! I can see into the clutch bell. Ouch, big mess in terms of the black material going everywhere. Any way to replace the bell without taking apart the whole frame. I recall it came somewhat pre-assembled. Perhaps just removing the clip and it could fall out and another sent back up in its place? I'm thinking I might have to disassembe the main shaft as well if I have to take the frame apart. It really is quite different tearing down. Not sure of the order and what can be left together other than the head, tail and hopefully servos and wires. The thing I really fear is the pitch lever as its screws strip too easily and are difficult to get the right tension to keep not too loose and yet not catch the sleeve.

Thanks for any more help.

Geoff.

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02-15-2006 03:38 PM  12 years agoPost 7
vavavoom

rrVeteran

London, England

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You can take the bell off without splitting the frames. Drop the motor out and hold the main gear firmly. Remove the top start hex adapter and drop the start shaft out of the clutch bell, then unscrew the clutch bell from the pinion and voila

## Inteligence is knowing a tomato is a fruit...Common sense is not putting it in a fruit salad

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02-15-2006 03:50 PM  12 years agoPost 8
raptorapture

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Singapore

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Next Step
Thanks Vavavoom!

Am removing the hex adapter now. Should have listened to raptortechnique and drilled that hole! Well, getting along. Will let you know.

Geoff.

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02-15-2006 04:00 PM  12 years agoPost 9
raptorapture

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Singapore

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Amazing
This is just amazing... just saved probably 4 hours (not so hot at heli construction) tearing down frame! Removed hex starter and starter shaft dropped, then 10 seconds later bell dropped. Thanks again. Now, there is a bumpy noise kind of noise which used to disturb me when I test spinned the main shaft. I used to think it might be related to the starter shaft gearing. Now that it is spinning freely with nothing touching the gears it makes this bumpy noise. I'm using the new auto hub that doesn't rub. Is this poor construction on my part? I did the replacement of the auto hub a while ago. Any ideas?

Thanks.

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02-15-2006 06:11 PM  12 years agoPost 10
Rcer22

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Somewhere In The Adirondack Mountains

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Maybe the bearings in the main shaft are dirty or the entire bearing or bearings are spinning making that sound. I use the process of elimination to find things like that.

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02-15-2006 06:26 PM  12 years agoPost 11
AlabamaRaptor

rrApprentice

Millbrook, AL (Montgomery area)

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Just a FYI...
follow raptortechnique for the clutch lining replacement (using electrical tape). It makes it a whole lot easier. If you can't find it let me know.


Raptor Titan 50 -- OS .50 Hyper -- Futaba 7C 2.4GHz

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02-16-2006 04:09 AM  12 years agoPost 12
raptorapture

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Singapore

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Main Shaft
Thanks guys.

It appears that the noise on the main shaft may be due to the replacement of the auto hub. I looked at it spinning and it appears that the main white gear below the autohub moves up and down vertically just a wee bit as it goes around.

Geoff.

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02-17-2006 03:11 PM  12 years agoPost 13
raptorapture

rrApprentice

Singapore

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Pinion Bearing?
I've disassembled the pinion gear to attach to a new clutch bell and now looking at the pinion gear, the top part (ie. the outside facing that goes towards/onto the starter shaft and inside the bearing at the top of the starter shaft) is scored. Three lines that are about 1mm apart and perfectly symmetrical. I'm able to feel the groove of each using my finger nail. Is this normally there, if not, can it still be used or does it need to be replaced. Does this also mean that the bearing at the top of the starter shaft needs replacement too? I decided to replace both clutch bell and clutch after taking it into the LHS. I hope I get my R50 airborne soon.

Thanks, Geoff.

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02-17-2006 03:15 PM  12 years agoPost 14
AlabamaRaptor

rrApprentice

Millbrook, AL (Montgomery area)

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Replace both bearings.


Raptor Titan 50 -- OS .50 Hyper -- Futaba 7C 2.4GHz

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02-17-2006 03:20 PM  12 years agoPost 15
raptorapture

rrApprentice

Singapore

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Pinion Bearing?
What about the pinion gear?

Geoff.

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02-17-2006 03:23 PM  12 years agoPost 16
raptorapture

rrApprentice

Singapore

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One way bearing
Come to think of it... the starter is supposed to have a one way bearing. Where is it? I can't figure out which bearing it is. The reason I would like to know is that the starter shaft made a noise when turned one direction but not the other.

Geoff.

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02-17-2006 03:46 PM  12 years agoPost 17
AlabamaRaptor

rrApprentice

Millbrook, AL (Montgomery area)

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If I'm not mistaken (I don't have it in front of me) the one-way bearing is in the clutch bell. If you pull it off and look in it you can see the one-way bearing but like I said I don't have one in front of me.

I'd replace all the bearings on the starter shaft (top and bottom bearings) then see where you have slop at. If a bearing or the shaft is scored then you have slop somewhere. You may also want to remove the starter shaft and roll in on same glass. If it is bent it'll make a "tick-thump-tick-thump" sound.


Raptor Titan 50 -- OS .50 Hyper -- Futaba 7C 2.4GHz

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02-17-2006 04:56 PM  12 years agoPost 18
raptorapture

rrApprentice

Singapore

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One way bearing
Figured it out. The one way bearing is in the clutch shoe. Thanks to raptortechnique I also found out what the extra washer was for. Makes the clutch bell spin much smoother. Not in manual! The washer fell out of previous clutch bell and was sitting on bench looking for a home. Tested it in bell first but was paranoid to leave in without supporting info. I'm beginning to think I should replace pinion gear (with scoring) in addition to bearings. Also, I'm thinking of replacing bearings on main shaft as it seems to make a lot of noise, move around with some slop when spinning freely. When main shaft gear is meshed with starter pinion gear, slop and most noise seems to disappear which suggests problem is masked.

Geoff.

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02-17-2006 06:12 PM  12 years agoPost 19
jag 2

rrNovice

Scotland

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The one-way bearing is housed inside the clutch itself, I have in the past replaced the bearing but I wouldnt recommend it as its a tolerance fit (and you can easily fit it the wrong way round as I did
I was very confused when I tried to start the engine and the starter just kept spinning, then the penny dropped
The only reason I replaced the bearing was when I bought a new clutch/starter shaft combo on e-bay from a fraud seller and the clutch arrived without the bearing so I just used one from the many broken units I collected
Cheers Brendan.

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02-18-2006 02:03 AM  12 years agoPost 20
Rcer22

rrVeteran

Somewhere In The Adirondack Mountains

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I just went through that with my Raptor 30 V2. The pinion gear had too much play where the bearing sits. l could feel the excess play when I touched the bell. This caused the the two gears to mess poorly. I had to replace the bearing on the pinion and the pinion gear to fix this problem. I tried to buy just the pinion bearing and had to buy both so I changed them both.
Now it runs smoooth.

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