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08-09-2010 11:51 PM  8 years agoPost 1
adampatrick

rrApprentice

Newcastle UK

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While starting the engine today one of the bolts that secures the clutch to the hub sheared off. After pulling the engine out I couldnt get the remaining piece of bolt out so had to drill it. This ruined the thread in the hub so I drilled both sides out and have fitted a single bolt and nylock nut to each side.

The manual calls for a 2 bolts either side of the hub, two securing the clutch and 2 helping to secure the fan along with the other 4. The red circles show the bolts i've replaced and the green shows where I had to drill out.

Anyone see any issues? I wasn't keen on having to replace this part as it seems quite pricey while this mod costs nothing and appears safe.

Any comments welcome.

Very high, very fast, too much money, no you cant have a go!

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08-09-2010 11:58 PM  8 years agoPost 2
z11355

rrMaster

New England

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I might suggest a highpoint balance of the assembly.

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08-10-2010 12:04 AM  8 years agoPost 3
adampatrick

rrApprentice

Newcastle UK

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Both sides use identical nuts and bolts so it should all be as balanced as it was before the mod.

Very high, very fast, too much money, no you cant have a go!

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08-10-2010 01:14 AM  8 years agoPost 4
Scott Anderson

rrVeteran

Enterprise, Al

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Looks like a good job to me. It should be balanced but any drilling or mods I would most definitely check the balance. Remember that hub will be turning up to 20,000 rpm.

Synergy R/C Helicopter Field Representative

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08-10-2010 01:37 AM  8 years agoPost 5
adampatrick

rrApprentice

Newcastle UK

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I dont actually have a highpoint balancer and have never balanced the engine or hub on any of my helis. The heli was free of any vibes before the mod so i'll give it a go first, if there are any showing during flight then I'll know what to check first.

Very high, very fast, too much money, no you cant have a go!

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08-10-2010 02:58 AM  8 years agoPost 6
Brian B.

rrApprentice

Marion, Iowa

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I would dial indicate the fan hub mounted on the motor to check for any run out. Just in case while making the holes wider that you did not drill off to one side.

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08-11-2010 03:06 AM  8 years agoPost 7
Pulento

rrVeteran

CHILE

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+1 I got a Lynx fan for my T700 and it had huge runout. Had trial and error on bolts to get it square.

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08-13-2010 10:47 PM  8 years agoPost 8
adampatrick

rrApprentice

Newcastle UK

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Flew yesterday and no new vibes found, I actually think the mod is a little more sturdy way of mounting the clutch, only downside is its a little tricky getting the nuts on while the fan is mounted to the engine. Was a lot cheaper than buying a new hub anyway

Very high, very fast, too much money, no you cant have a go!

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08-19-2010 10:45 AM  8 years agoPost 9
dkpodder

rrNovice

Vinderup, DK

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I think I just found the reason for Your trouble...

When building my kit number 2, and installing a Lynx fan, the clutch screws backed up against the screw from the fan side. The result: stripped threads in the fan hub, because I tightened it hard at the last 0.5 mm...

The reason is, the Lynx fan is aprox. 1 mm thinner than the stock plastic fan, and we need to use shorter screws. Why isn't this mentioned on the Lynx fan package, or even supplied with 2 M3 x 6mm screws ?!?

Now im either going to do the above suggested mod, or replace the fan hub

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08-19-2010 11:05 AM  8 years agoPost 10
adampatrick

rrApprentice

Newcastle UK

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That looks like the issue, well done spotting that dkpodder. Go with the mod it works fine, just a 3mm drill to take the remaining threads off and its solid as a rock, just a little tricky getting the nuts on while the fan is mounted to the engine but its easy enough.

Very high, very fast, too much money, no you cant have a go!

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