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09-19-2009 04:19 PM  11 years ago
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steph

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Hampshire England

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Pred turbine mw 54
Stripped a main gear today have not got around to taking it off yet but i am wondering what gear ratio's everyone else is running i am using mah 82mm blades with 90t main and 10t pinion 9.0 to 1 ratio
it would be interesting to hear your setups
With the bigger blades i am thinking of possibley going for a lower gear ratio what do you guys think ??
The world is round you can run but you will always end up where you started from
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09-19-2009 05:05 PM  11 years ago
steph

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Just found the reason why the main gear stripped 3 of the 4 gear retaining bolts had sheared only leaving 1 to hold the gear on the outa gear hub thus causing the gear to move around in flightThe world is round you can run but you will always end up where you started from
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09-19-2009 05:12 PM  11 years ago
ppridday

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Wow! Close call there...

Paul
"There's someone in my head, but it's not me..."
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09-23-2009 01:42 PM  11 years ago
steph

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Gents i thought i would have got better responce from you guys never mind i went witht he same gears as i removed.

I have another question after the responce i got from the other question i don't expect any answers for this one.
well hear goes

After fitting the new gear and reasembling the main shaft the instructions say to push down on the main shaft
and tighten the top collet if i do this the endfloat on the shaft is about 5mm this can't be right i think i must have something incorrect can anyone throw some light on this ??
The world is round you can run but you will always end up where you started from
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09-23-2009 02:08 PM  11 years ago
MattJen

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Hi Steph,

I hadn't posted cos i thought you had resolved your issue,

Onto this new problem,
it sounds to me as if you have missed the spacer washer that goes under the auto hub carrier part no,HW6054 it sits on top of the bottom bearing

Matt
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09-23-2009 02:28 PM  11 years ago
ppridday

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Same here. Thought you had it sorted...
As Matt said, it sounds like you have missed the brass spacer..

Paul
"There's someone in my head, but it's not me..."
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09-23-2009 02:48 PM  11 years ago
steph

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Hi Matt & ppriday

The spacer on the bottom bearing block is in it correct place
seems to me there must be another spacer somewhere that i have missed
I don't have the exploded drawings if there is any i sure could do with them
The world is round you can run but you will always end up where you started from
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09-23-2009 02:49 PM  11 years ago
ppridday

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PM'd you steph

Paul
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09-23-2009 03:23 PM  11 years ago
steph

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Thanks for those manuals i already have those ones i was hoping for a exploded drawing of the predator main shaft assembly

Both those manuals contradict each other in respect of how to adjust the main shaft and tighten down on the mast collet the gasser says to pull up the main shaft and tighten the collet
The 90 manual says to push down on the mast and tighten the mast collet

If i push down this is when i have around 3mm end float

If i pull up on the main shaft the mesh is too tight on the tail and causes a vibration
The world is round you can run but you will always end up where you started from
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09-23-2009 06:10 PM  11 years ago
MattJen

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are you missing the thrust race at the bottom of the mast?

there ahould be 3 mast bearings, one at the top, one at the bottom, and the thrust race that goes below the bottom bearing which is retained with the collett..

The bottom collar has 2 x M3x6 flat head screws, and is confusingly part numbered in the manual HW6054..
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09-23-2009 06:51 PM  11 years ago
steph

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Hi Matt

now this is very confusing as my thrust race is on the top bearing not on the lower bearing as you say.

I wondered about this as in the manual it dose say something about the thrust race while in the same sentence with the lower collet.

So should there be a thrust race above the top bearing and below the lower bearing ??

I see the gasser instruction have a thrust race above and below.
The 90 instructions has a thrust race below the lower bearing
And my thrust race is above the top bearing

Matt have you got a exploded view of the mast assembly ??
The world is round you can run but you will always end up where you started from
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09-23-2009 07:09 PM  11 years ago
MattJen

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Hi Again Steph

starting from bottom of mast,

COllett,
Thrust race (make sure you get it right way round),
then the thrust race spacer washer, ( which is a tiny washer and it is vital, otherwise you will metal to metal friction between the thrust race and the bottom bearing and it will lock you out)

then on the top of the bottom bearing ( main gear side) a bronze spacer which sits on top of the bottom bearing,

then you have your hub which carries all the main gear, and then so on... if you look in section 46 you will see the exploded view of the thrust washer and how it sits on the bottom of the main mast bearing.

Matt
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09-24-2009 08:45 AM  11 years ago
steph

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Thanks Matt

I'll have a look at that and try the thrust race on the lower bearing, as that to me is logical, as the thrust race on top of the top bearing won't be achieving much not unless you are inverted flying.
The world is round you can run but you will always end up where you started from
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09-24-2009 08:30 PM  11 years ago
steph

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I think i have it sorted i have the triple bearing block on the top this utilises 2 radial bearings and a thrust race on top.

I have ordered a new thrust race for the lower bearing can't understand why this was not fitted as i did not build this helicopter i bought it ready built.

I have another question: The thrust races has a spacer inbetween the radial bearing and the thrust race, The thrust race spacer is od 16mm and id 14mm as the radial bearing is 19mm od this means the spacer will sit on the radial bearing cage instead of the outer rim of the radial bearing so the load is sitting on the cage i am not happy with this so i will fit a spacer that is 19mm od and 14mm id x 1mm depth
The world is round you can run but you will always end up where you started from
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09-28-2009 10:24 AM  11 years ago
steph

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All sorted now thrust race top and bottom with 19mm spacers fitted instead of 16mm that century supply.

Thanks guys
The world is round you can run but you will always end up where you started from
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