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jbaum81 · 08-03-2015, 01:10 AM

All,

I just picked up a 2nd hand 690sx, and the counter bearing is not like my 600sx, nor is it like the manual for the 690. The counter bearing itself actually has a really wide bore bearing and it rides on a machined slot inside the OWB housing. The shaft does have the slot for the c clip, but the shaft is too short and sits flush with the bottom of the bearing on the OWB housing.

Is this normal, or an "upgrade" from somewhere? I don't see that there is anything there preventing the bottom bearing from falling out of the OWB housing.

RJVan · 08-03-2015, 10:13 PM

This is normal. I think it changed when they re-designed the one way early on. If you look at the V2 manual it should be correct.

jbaum81 · 08-04-2015, 01:15 AM

Thanks, I forgot to update this, I found my answer last night. I didn't look directly with Mikado, but Mikado USA has an outdated manual on their site.

On a side note, I was able to maiden it tonight and Mikado does not disappoint.

EdinTexas · 08-05-2015, 05:18 PM

Mikado had a series of failures with the original OWB. That's the one shown in the manual. In fact they sent letters to owners of the 690SX kits asking them not to fly until they resolved the problem. The re-designed OWB included the new counter bearing which is what you have. Mikado sent them to all the original kit owners for free. As an "early adopter" I received the upgraded parts. I respect Mikado's commitment to their customers however the strict disclaimer they included, to-wit that you use ONLY the Scorpion motor included in the kit and absolutely no more than +-11 degrees collective did not cause me to have a lot of confidence in their engineering of the model nor its robustness. Nevertheless I still own it and I haven't had any issues with it so far.

jbaum81 · 08-05-2015, 06:27 PM

So... How much collective do you run? I have mine setup with 13 right now and it seems fine.

EdinTexas · 08-06-2015, 05:59 PM

I have my collective set to +-12 degrees but I don't do much hard 3D.

jbaum81 · 08-06-2015, 11:31 PM

I may tone mine down. I only have 2 flights on it so far. Had a tail vibe issue, and waiting on new tail blades.

philipjdall · 08-07-2015, 05:55 AM

Quote:

Originally Posted by jbaum81

So... How much collective do you run? I have mine setup with 13 right now and it seems fine.

I actually found that 13+ just overstressed the system unnecessarily. Eventually settled on 11 (I know!); try it you may be surprised.

jbaum81 · 08-07-2015, 10:31 AM

I was doing some rainbows and on the backside I did a hard punchout into fast inverted backwards flight and heard some definite groans and a bit of a drop in power, thinking maybe the owb slipped. Maybe I'll try for 11.5 at around 2100 and see how that does for me.

What HS are you at with 11?

philipjdall · 08-09-2015, 12:33 AM

Hmm I think about 1850/1900 - but will check again today!

08-03-2015, 01:10 AM	#1 (permalink)
jbaum81 Registered Users Join Date: Aug 2013	690sx counter bearing All, I just picked up a 2nd hand 690sx, and the counter bearing is not like my 600sx, nor is it like the manual for the 690. The counter bearing itself actually has a really wide bore bearing and it rides on a machined slot inside the OWB housing. The shaft does have the slot for the c clip, but the shaft is too short and sits flush with the bottom of the bearing on the OWB housing. Is this normal, or an "upgrade" from somewhere? I don't see that there is anything there preventing the bottom bearing from falling out of the OWB housing.

08-09-2015, 12:33 AM	#10 (permalink)
philipjdall Registered Users Join Date: Dec 2011	Hmm I think about 1850/1900 - but will check again today! __________________ Phil

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08-03-2015, 10:13 PM	#2 (permalink)
RJVan Registered Users Join Date: Aug 2013	This is normal. I think it changed when they re-designed the one way early on. If you look at the V2 manual it should be correct.

08-04-2015, 01:15 AM	#3 (permalink)
jbaum81 Registered Users Thread Starter Join Date: Aug 2013	Thanks, I forgot to update this, I found my answer last night. I didn't look directly with Mikado, but Mikado USA has an outdated manual on their site. On a side note, I was able to maiden it tonight and Mikado does not disappoint.

08-05-2015, 05:18 PM	#4 (permalink)
EdinTexas Registered Users Join Date: Feb 2013	Mikado had a series of failures with the original OWB. That's the one shown in the manual. In fact they sent letters to owners of the 690SX kits asking them not to fly until they resolved the problem. The re-designed OWB included the new counter bearing which is what you have. Mikado sent them to all the original kit owners for free. As an "early adopter" I received the upgraded parts. I respect Mikado's commitment to their customers however the strict disclaimer they included, to-wit that you use ONLY the Scorpion motor included in the kit and absolutely no more than +-11 degrees collective did not cause me to have a lot of confidence in their engineering of the model nor its robustness. Nevertheless I still own it and I haven't had any issues with it so far.

08-05-2015, 06:27 PM	#5 (permalink)
jbaum81 Registered Users Thread Starter Join Date: Aug 2013	So... How much collective do you run? I have mine setup with 13 right now and it seems fine.

08-06-2015, 05:59 PM	#6 (permalink)
EdinTexas Registered Users Join Date: Feb 2013	I have my collective set to +-12 degrees but I don't do much hard 3D.

08-06-2015, 11:31 PM	#7 (permalink)
jbaum81 Registered Users Thread Starter Join Date: Aug 2013	I may tone mine down. I only have 2 flights on it so far. Had a tail vibe issue, and waiting on new tail blades.

08-07-2015, 10:31 AM	#9 (permalink)
jbaum81 Registered Users Thread Starter Join Date: Aug 2013	I was doing some rainbows and on the backside I did a hard punchout into fast inverted backwards flight and heard some definite groans and a bit of a drop in power, thinking maybe the owb slipped. Maybe I'll try for 11.5 at around 2100 and see how that does for me. What HS are you at with 11?

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