690SX one way bearing recall

[hemp]

Originally Posted by Andy from Sandy

I suspect there is a more scientific way of testing the OWB

What's more scientific than "If it works for Alex Wiehenstroth, it'll work for you."

But seriously, field testing is really the best way to know if the complete system is going to work in real life.

[tjmarti]

Good call Mike! Hit the nail right on the head! : )

[Andy from Sandy]

But seriously, field testing is really the best way to know if the complete system is going to work in real life.

What is the actual rotational force before failure of a OWB?

Just because it didn't fail in the video is not a clear indication that the bearing is flawless.

So are you suggesting that no-one knows how much force a OWB can take and that the purchase department and QC department are totally happy that Alex Wiehenstroth couldn't break so it must be okay?

I cannot believe that Mikado found a bearing through trial and error for any of their models. Manufacturers produce spec sheets, that didn't get produced by flying them around in a model helicopter.

[hemp]

Originally Posted by Andy from Sandy

I cannot believe that Mikado found a bearing through trial and error for any of their models.

Wow, that's a lot of conclusions to draw from a video and an unqualified statement

I'm quite sure Mikado knows the spec'd force rating of the bearings. They have no need or reason to share that or their internal testing/validation process. The video was just a marketing piece, not a scientific analysis of one-way bearing strength.

I am confident the new bearing solution will work well if Mikado is comfortable releasing it. They said it is 30% stronger, which indicates there was some math and lab testing involved.

[Andy from Sandy]

Wow, that's a lot of conclusions to draw from a video and an unqualified statement

Your whole post now seems to be a back track and is basically what I put in my first post but no matter.

I have no doubt Mikado are happy with what is now going to be supplied and I look forward to getting my kit soon.

[JesseRigg]

Shipping today. Thank you mikado USA.

[satsuma]

Got my replacement bearings and parts today, will fit them tomorrow at some point.

[hemp]

Originally Posted by Andy from Sandy

Your whole post now seems to be a back track and is basically what I put in my first post but no matter.

Just to be clear, my statement about Alex's flight being scientific testing was meant as sarcasm. I expected that would be apparent from the absurdity of the statement, the emoticon after it, and the next sentence beginning with, "But seriously..." Since it appears the sarcasm was lost, I am sorry for any confusion my dry humor may have caused (wouldn't be the first time!)

Back on topic, I'm told that all of the recall replacements shipped out from Florida today. Super excited to get the new parts in my hands and in the heli and get her back in the air.

[satsuma]

Changed the one way bearing and the lower motor bearing carrier etc, no need for the circlip on the main shaft as it doesn't go past the edge of the bearing, strange.

[taosgraveyard]

Mmmmm. I guess so long as the pin doesn't shear,,,,

[RyanW]

My take on the c-clip is that it was a backup. On the 690SX the tail pulley is aluminum vs plastic so maybe it was thought the strength in that area provided sufficient safety margin so that the clip wasn't an absolute necessity. Of course if they had room for it, you would install it just as the original design had it. However I have never (in all my years flying the plastic frame design) seen the pin fail in any way.

[satsuma]

Originally Posted by RyanW

My take on the c-clip is that it was a backup. On the 690SX the tail pulley is aluminum vs plastic so maybe it was thought the strength in that area provided sufficient safety margin so that the clip wasn't an absolute necessity. Of course if they had room for it, you would install it just as the original design had it. However I have never (in all my years flying the plastic frame design) seen the pin fail in any way.

Totally agree with what you say, plenty strong enough, and also never seen the pin system fail.

[Daniel880516]

Will this work with the logo 600sx?

[RyanW]

Originally Posted by Daniel880516

Will this work with the logo 600sx?

I don't think so... here is why:

The tail pulley (front and rear) are different on the 690SX as is the belt. The front pulley is machined so that the one-way assembly will fit. The problem is the tooth profile is different, which means you would need to run the 690SX belt and tail pulley, which would then make it a 690SX or stretched 600SX.

[Daniel880516]

Originally Posted by RyanW

I don't think so... here is why:

The tail pulley (front and rear) are different on the 690SX as is the belt. The front pulley is machined so that the one-way assembly will fit. The problem is the tooth profile is different, which means you would need to run the 690SX belt and tail pulley, which would then make it a 690SX or stretched 600SX.

Thanks!

[taosgraveyard]

I think a better way to say it is

If the right length belt with the correct tooth profile can be located, then it will work on a 600 SX, provided both pulleys are changed

[RyanW]

There is also an issue with the fitment of the motor plate. I am investigating this now.

[taosgraveyard]

What is the issue?

The 690 and the 600 SX use the same frame,

I did notice that they changed the motor mount, the rear edge no longer has the curved radius.

[Mentalic]

Originally Posted by taosgraveyard

What is the issue?

The 690 and the 600 SX use the same frame,

I did notice that they changed the motor mount, the rear edge no longer has the curved radius.

Noticed that as well, but it's not a new part. It's the mount for the 500 which provides more clearance for the tail belt pulley.

[gulyi]

Can anyone tell me what belt type is used onn 690 sx or whaht is printed on the belt exactly?

I m planing to find a shorter HDT belt for my 600sx, cos I m fed up with the owb failures...
THX