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Rave ENV 700 › Scorpion getting to the bearing
01-15-2011 08:48 PM  7 years agoPost 1
rapidity

rrVeteran

ohio

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Guys that are running the scorpions, I'm wondering how hard is it to get to the pinion side bearing to oil it.

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01-15-2011 11:20 PM  7 years agoPost 2
snipealot

rrApprentice

Frederick, MD

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I just pulled my motor today to adjust the pinion and I oiled the bearing while I had it out, but I really don't see how you can get to it without pulling the motor and the counter bearing support.

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01-15-2011 11:23 PM  7 years agoPost 3
Supercoolheli

rrKey Veteran

Stillwater, Oklahoma

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i'm just not oiling mine. With scorpions you can either oil the bearings every 3-4 flights, and have them last maybe 20% longer, or you can simply let them run out and replace them. They should easily get 50-70 flights without oiling. I just find it much easier to not have to worry about it, or in this case pull the motor and all that. My vote goes to just don't worry about it and sacrifice a few flights per set of bearings. No biggy IMO

Eric Olson:
Team SAB USA
Team Pulse Ultra

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01-16-2011 06:20 PM  7 years agoPost 4
rocket_33

rrElite Veteran

Mount Pleasant, Michigan USA

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Ceramic....much less maintenance

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01-18-2011 04:36 AM  7 years agoPost 5
Dr.Ben

rrMaster

Richmond, VA, USA

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Bob,

I have ceramics, AND I oil them in my Scorpion (different model), BUT if I were in this situation and were unable to reach the bearing, I'd surely use a ceramic.

Ben Minor

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

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01-18-2011 08:57 AM  7 years agoPost 6
rapidity

rrVeteran

ohio

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I was leaning to go with another xera, but I'll ck into those. Prefer not to have to buy another motor.

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01-19-2011 08:16 AM  7 years agoPost 7
JWatson

rrKey Veteran

Mustang, OK

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Funny this came up the other day in the shop.

Don C. took and cut a slot in the motor mount, that is basically a Funnel for the oil to go to the bearing.

Pretty simple actually. It basically just gives you a clear shot at the bearing so you can us the scorpion oiler to access the bearing from the side, without removing the motor.

I will see if I can get him to post a few pics of this mod.

Jarrett Watson
http://jarrettrc.wordpress.com/

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01-20-2011 01:18 AM  7 years agoPost 8
Sky Dancer

rrVeteran

Bryan, Texas

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Here's a couple of quick shots of the mod I did to oil the motor bearing near the pinion. I can easily get the Scorpion oiler right to the bearing.

Don C

Keep up your rotor speed !

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01-20-2011 01:32 AM  7 years agoPost 9
rocket_33

rrElite Veteran

Mount Pleasant, Michigan USA

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Be careful there, you have a stress riser now as it is pretty close to the bolt location. Just a word of advice

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01-20-2011 05:31 PM  7 years agoPost 10
Sky Dancer

rrVeteran

Bryan, Texas

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Thanks for the advice Rocket, I'll keep an eye on it.

So far it's been holding up nicely and it sure makes it quick and easy to get to the bearing for oiling.

How do you oil yours?

Don C

Keep up your rotor speed !

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01-20-2011 05:57 PM  7 years agoPost 11
rocket_33

rrElite Veteran

Mount Pleasant, Michigan USA

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Being honest Don, I replaced the bearings with ceramic bearings. I lubed them when I installed them and don't touch them at all. We use ceramics in things I do at work so I felt they would work well with this. In fact in my motor mount support (I built my own some time ago) I also use a ceramic bearing in the motor shaft support.

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01-20-2011 11:14 PM  7 years agoPost 12
Sky Dancer

rrVeteran

Bryan, Texas

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Cool Rocket....

Those Ceramic bearings sound pretty good. How many flights do you have on them? Ever changed any of those out?

I was ready to go to Ceramic bearings years ago but a good friend who had tried them said they didn't seem to last any longer than standard bearings. Strange.... Maybe it's the application and load that might make a difference.

Don C

Keep up your rotor speed !

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01-21-2011 12:53 AM  7 years agoPost 13
rocket_33

rrElite Veteran

Mount Pleasant, Michigan USA

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Ceramic bearings are just like any others. There are different qualities or grades of Silicon Nitrate Ceramic balls on the market. Differences include impact resistance, roundness, surface finish and wear resistance. The highest quality bearings are Grade 5 (the very best), then you have grades 25, 50 and 100. Depending on what you use, you may find them to be superior to typical steel or the same as.

I am using a Hybrid bearing rather than full ceramic. The Hybrid uses the steel race and ceramic balls as opposed to full ceramic which is cage, race, and balls.

It is cold here now so my ENV flying is on the shelf until spring but Dr Ben has been using them for quite a while in his contest machine so he could better advise long term in a 700 class machine. I did put a set in my Rave 450 as well, never oiling them from when I installed them and have had a whole summer on them and haven't touched them once and I notice no noise or change in the motor (-8 running 350 mains at about 3200 rpm)

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01-21-2011 01:00 PM  7 years agoPost 14
rapidity

rrVeteran

ohio

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I think I'm gonna go with snipe and supers plan, and just run it till it needs replaced. Then try a ceramic and see how that goes, they're a lot more expensive and have to last at least 4x longer. The motors pretty easy to pull and replace in this heli.

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01-21-2011 06:56 PM  7 years agoPost 15
Buzzin Brian

rrProfessor

College Station, Texas

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The only issue I see with doing that is the likely hood of damaging the motor itself when the bearings do go. I know Curtis has damaged a few motors after the bearings went south. So just be aware that plan might be costly in the end. As the motor can be destroyed with that plan.

Just trying to offer fair warning.

Brian

Build it, fly it, crash it. Repeat as often as needed.

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01-21-2011 07:01 PM  7 years agoPost 16
rocket_33

rrElite Veteran

Mount Pleasant, Michigan USA

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A very good point and another reason why the ceramics in the end, while costing a bit more, are cheaper in the end

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01-22-2011 12:41 PM  7 years agoPost 17
rapidity

rrVeteran

ohio

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This is making my head hurt. I'll stick to what I know and trust and get another Xera.

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01-22-2011 03:20 PM  7 years agoPost 18
JWatson

rrKey Veteran

Mustang, OK

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Electrics make my head hurt!

Jarrett Watson
http://jarrettrc.wordpress.com/

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