Oxy 2 and RCM-BL250MX motor. - HeliFreak
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Old 12-07-2017, 12:53 PM   #1 (permalink)
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Default Oxy 2 and RCM-BL250MX motor.

Finally pulled the trigger and got an Oxy 2 sport, the plan was to use the electronics from my old T-Rex 250 (except the fbl) with the motor, the problem I'm having is that the lynx pinion (13t) doesn't fully bite the main gear, probably the motor shaft is not long enough, the pinion only bites 40% or so of the main gear, ,I'm not sure if this will affect performance or wear out the teeth of the main gear, do you guys using this motor had this problem?
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Last edited by rockdj; 12-07-2017 at 03:02 PM..
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Old 12-07-2017, 01:04 PM   #2 (permalink)
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Not good. Should be full seated. You can just reposition the pinion on the shaft after pulling it off. I used to run this motor on one of my O2 months back for about 100 flights then upgraded. Good motor for low headspeed.
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Old 12-07-2017, 03:00 PM   #3 (permalink)
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Yeah I thought of that, but wasn't sure of it since it would leave a few mm of the pinion out the motor shaft, worried it might lose when flying and result in a crash.
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Old 12-07-2017, 03:06 PM   #4 (permalink)
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We run them high up on the motor shaft. Barely high enough to fully engage the main gear. I have one like this and have had no problems out of it. I scuffed the motor shaft with fine sand paper. Cleaned the pinion with alcohol then after all dried up put it together with green loctite.
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Old 12-07-2017, 03:25 PM   #5 (permalink)
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Quote:
Originally Posted by TeeJayShelton View Post
We run them high up on the motor shaft. Barely high enough to fully engage the main gear. I have one like this and have had no problems out of it. I scuffed the motor shaft with fine sand paper. Cleaned the pinion with alcohol then after all dried up put it together with green loctite.
+1 this.

Ignore this part; see below: But red loctite is what recommended for this job: Loctites /

What i meant fully seated above was: gear to gear seating.
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Last edited by e92.M3; 12-07-2017 at 07:55 PM.. Reason: Wrong info
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Old 12-07-2017, 03:27 PM   #6 (permalink)
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I'm running a Trex 250 motor and yes, only about half of the pinion engages on the shaft.

The question has been asked several times and Luca has confirmed it's fine like this. Provided you're using retaining compound it's not going to move.

My Oxy had a 4500rpm inverted crash, hitting hard enough to strip the main gear. The pinion didn't budge, despite the motor shaft only being half way through it, and I'm still flying it today.
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Old 12-07-2017, 06:03 PM   #7 (permalink)
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Thank u all, I'm going to just insert half of the pinion in the shaft.

BTW do you know if the DS415M servos will fit in the Oxy 2?, those are the ones from the T-Rex 250.
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Old 12-07-2017, 06:16 PM   #8 (permalink)
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Nope. Too big and heavy.
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Old 12-07-2017, 07:37 PM   #9 (permalink)
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I keep posting this over and over, DO NOT USE THREAD LOCKER FOR MOTOR PINIONS !
It is not made for this!!!!

Use retaining compounds for pinion install.


https://www.helifreak.com/showthread...=green+loctite

HW.
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Old 12-07-2017, 07:53 PM   #10 (permalink)
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Oh yeah... Missed that bigtime... All apologies...

Should be this: Omicron Red
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Old 12-07-2017, 09:08 PM   #11 (permalink)
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When it comes to change pinions how difficult is it to remove existing pinion and put on a new pinion on the motor shaft?
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Old 12-07-2017, 10:12 PM   #12 (permalink)
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This: Pinion remover l

Or heat it a few seconds with small torch then pull pinion with pliers. Cover the pinion with thin cardboard before pulling to protect the teeth. Or use flat tip screw to twist pinion away from motor body.
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Old 12-08-2017, 01:19 AM   #13 (permalink)
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As above, you MUST use retaining compound if you want the pinion to hold securely. When you want to remove it a little heat from a soldering iron releases it nicely.
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Old 12-08-2017, 04:27 AM   #14 (permalink)
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If you have a decent soldering iron, just holding to the pinion to get good and hot and the pinion will pull off pretty easy.

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