Turnigy SK vs. Turnigy

[mani9876]

Hello, I was looking for a new motor for my friction drive, and I don't know if i should choose a SK Turnigy or a normal one. This is what Hobbyking says:

TURNIGY AerodriveXp SK Series
AerodriveXP SK Series motors are designed for those who want the very best in outrunner technology for their R/C plane. Typically an efficiency improvement of around 8-10% can be seen over similar classed motors. This is in part due to the following;
Stator Laminations: .2mm
Magnet Type: N45SH
Bearings: Dual oversize (Japanese)
Shaft: 10mm Hardened


But is this the truth? What about the glued magnets and such things, are they better than the normal ones? And are the SK better than the new Turnigys with skirt bearing?

Thanks

ATB
Manuel

 

[gwhy!]

Hello, I was looking for a new motor for my friction drive, and I don't know if i should choose a SK Turnigy or a normal one. This is what Hobbyking says:

TURNIGY AerodriveXp SK Series
AerodriveXP SK Series motors are designed for those who want the very best in outrunner technology for their R/C plane. Typically an efficiency improvement of around 8-10% can be seen over similar classed motors. This is in part due to the following;
Stator Laminations: .2mm
Magnet Type: N45SH
Bearings: Dual oversize (Japanese)
Shaft: 10mm Hardened


But is this the truth? What about the glued magnets and such things, are they better than the normal ones? And are the SK better than the new Turnigys with skirt bearing?

Thanks

ATB
Manuel

I think the TURNIGY AerodriveXp SK Series are very good value for the money ( I have 2 of them and am very pleased with them ) they run cool and a very low no load current, I have a larger turnigy 6.5kw with the skirt bearing and to be honest I dont like it, I removed the skirt bearing because it got hot. I added more glue to the magnets and replaced the bearings on all my motors before I used any of them.

 

[mani9876]

Ok, so it's true that the SK series has more efficiency? When you add some glue, you don't take of the magnets, you just take Locite 642 ( e.g. ? ) and let it run into the holes or what ?
Why do you replace the bearings, I thought that in the SK are better ones ?

ATB

 

[gwhy!]

Ok, so it's true that the SK series has more efficiency? When you add some glue, you don't take of the magnets, you just take Locite 642 ( e.g. ? ) and let it run into the holes or what ?
Why do you replace the bearings, I thought that in the SK are better ones ?

ATB

No just added more glue ( fill the gaps ) any hi temp epoxy. I replaced the bearings ( just in case ) The ones that were fitted from new looked fine to be fair so maybe did not need replacing.

 

[Hillhater]

which of the turnigy's have skirt bearings ?..just the biggest ?

 

[Thud]

hillhater,
some of the 63mm turnigys also have a skirt bearing, at the bottom of this page is am axample of a SB model next to a the "areodrive" non skirt.
http://www.hobbycity.com/hobbycity/store/uh_listCategoriesAndProducts.asp?idCategory=222&curPage=3&v=&sortlist=

you will notice some screws near the ends of the magnet rotor that allows assmbly of a skirt bearing motor.

 

[dontsendbubbamail]

I am going to assume that your friction design is not the one where the motor is the roller on the tire. As I understand that design, it requires a motor with a skirt bearing.

The issues with Hobbyking motors have been throughly discussed in various threads of this forum. The basic issues are that they use low quality bearings, don't seem to use a lot of glue on the magnets, and come from the factory with loose screws. So to keep from being stranded on the side of the road you replace the bearings, add glue, and tighten the screws. You may experience some or all of these problems. Personally I have never had a glue problem.

As to which motor is best for you, it looks like it just boils down to a power issue. Efficiency is a moot point when choosing between Hobbyking motors. Assuming that you run both motors at the same power lever then either motor will get you the same distance down the road. I think you would be hard put to measure the difference in efficiency on the road. Now I am talking practical here. I am sure that you can engage some on the technical folks on the forum and dive into the theoretical details.

Bubba

 

[Hillhater]

you will notice some screws near the ends of the magnet rotor that allows assmbly of a skirt bearing motor.

OK, thanks Thud. so the extra screws are the tell tale for skirt brgs in Turnigy's ?....
.... but what about the Aerodrives that dont have any skirt screws, but have been reported to have skirt brgs in some ?

 

[Thud]

I can't address the entire line,
I have the 63mm motors with the chrome cans (screws visable)are skirt bearings.. the black label cans have no skirt bearings.
I have not seen an outrunner fitted with a skirt bearing, that did not show a visable fastener anchoring the bearing yoke to the magnet rotor. But it would not be imposable....

 

[Hillhater]

I have not seen an outrunner fitted with a skirt bearing, that did not show a visable fastener anchoring the bearing yoke to the magnet rotor. But it would not be imposable....

OK, sorry i didnt expect for you to have all the answers. Its tricky to know exactly what you are getting from some of the descriptions.
FYI: the Hyperion "Z" series have skirt brgs , but dont appear to have any external fixing ?

 

[Thud]

I stand corrected.
clearly noy impossible.