Which bearings for my Scorpion motor?

[Jamin_00]

I have got a 4035-500 and upon stripping it down I noticed the bearings are a little notchy so while its apart I want to get some different bearings for it, ie: not scorpion

So what are the best bearing to get for this motor and also do you know the exact size I need to get and I will order enough to do all my motors

Thanks

[G-Bru]

I have got a 4035-500 and upon stripping it down I noticed the bearings are a little notchy so while its apart I want to get some different bearings for it, ie: not scorpion

So what are the best bearing to get for this motor and also do you know the exact size I need to get and I will order enough to do all my motors

Thanks

Hi Ben

I am running Boca Ceramics in my X5's 4020-910. 26 Flights and no dramas so far.

I did however get this reply from the owner of Scorpion regarding replacement bearings for the 4525 LTD Edition.

Hi Grant
for the Bearing, try to get NMB 6800ZZ 10mm*19mm*5mm, or equivelent from NSK, do not use Hybrid or ceramic bearings.
Georges

Hope this helps.

G


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[Jamin_00]

OK, wonder why they would not recommend the use of hybrid or ceramics?

Cheers G

[G-Bru]

Here you go Ben

Hi All
Just so every know, all the HK series motor made by Scorpion use bearings from Japanese companies such as NMB, NSK, AZO.. they are not cheap bearings,
and just so you guys know, ceramic bearing are weaker then the stock bearing in terms of sideload!! they will be dameged much faster then the stock bearing under strong side load that heli has, so I really do not recomand to use ceramic bearings, same for hybrid bearings.
oil your bearings from time to time to soften the grease in the bearing and it will last very long time.
Georges
owner of Scorpion.

G


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[Jamin_00]

OK cool.

Gonna order some now

[G-Bru]

Some more useful information from Georges, for you and others with Scorpion Motors.

the life of bearings in a heli motor depend on the folowing,
1.how much side load ? the more the shorter.
2, how much power the motor will develp, the more the shorter.
3, the grease in the bearing, it will eventually settle in a place that is not lubricating the ball any more, oiling the bearing help to move them inside the bearing.

the bearing we use will give you hundreds of flight if the gear mesh are setup correctly, same as any other good motor on the market.

oiling them will extend the life, so we recommend to oil them, but this is some thing that is applicable to all hobby motors, not just to our motors, the problem is not all motor manufacturer tell you this, some even take this as an argument saying their motor is better because you don't need to oil the bearings! I seen this argument in a video interview of IRCHA 2009, just so you know, this particular motor in the video was using the exact same bearing as us "NMB" and NMB is also use by Kontronik and most of the other German made motor.

I'm a modeler my self and play with my toys nearly every weekend, and have been in this hobby since 1972, competing in F2A and F3D/F5D for many year, this is why I like hi power motors and engines, and speaking on this, bearing is a vital parts in speed competition and racing, so I recommend to oil the bearing based on my personal experiences and test that we have done, oiling the bearing will extend the life of the bearing by at least double !

now if you don't want to do it, it's ok too, but you will need to change them at least after few hundred flights, in F3D our flight time was about 90 second, and F2A was about 30 second per flight, we all change our bearing every 50 flight or so.

also, most of the good heli pilot will change the main shaft bearings after a hard crash, even other bearings of the heli, we all know a crash will damage the bearing due to the shock it get during a crash, but how many of them will remember to do the same on the motor it self? not many i can tell you, but they should!!

Georges

G

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[Jamin_00]

Gonna get some NSK's and the size, for future reference is

16mm OD
8mm ID
5mm thick

[G-Bru]

Gonna get some NSK's and the size, for future reference is

16mm OD
8mm ID
5mm thick

Thanks Ben

May I ask, who you ordered them from?

G


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[Jamin_00]

This place


http://www.essexbearings.co.uk/

I just rung them with the product number of what I have which are NMB's and asked for the best that they reccomend and they are going to look for me and come back with the info.

This is a place a friend used to get engine bearings from and the company are highly recommended, apparently

[G-Bru]

This place


http://www.essexbearings.co.uk/

I just rung them with the product number of what I have which are NMB's and asked for the best that they reccomend and they are going to look for me and come back with the info.

This is a place a friend used to get engine bearings from and the company are highly recommended, apparently

Very cool, thanks for the link bud!

G


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[Si_B]

Just managed to drop the pinion grub screw into my new scorpion motor. Is it the grub screw at the back or circlip at the front which needs to come off so I can get the can off. Can't believe I've got to take apart a new motor

[Jamin_00]

No drama, take the circlip off then the inards will pull out leaving the shaft behind still attached to the can

[Si_B]

Thanks for that. Thought it was better to check than just start pulling bits off. Thanks for the quick reply, better pop out and buy some circlip pliers.

[Si_B]

All sorted...............got the little bugger out !!