trex700E one way bearing slips

[ddj74]

Yeah yeah nothing beats German engineering...blah blah blah.

[Mystic3D]

Originally Posted by ddj74

Yeah yeah nothing beats German engineering...blah blah blah.

Align does a very good job on designing, and so does SAB. Seems more like when the manufacturing happens in mass production, then problems arise. Having said that after a lot of work my 700E is solid as a rock. The Goblin is pretty darn good as well bone stock. The Diablo is just a work or Art.

Hard to really compare a German Boutique heli to Align or SAB, plus and minus for sure.

[DenisFerrari]

Hi,
today while spooling up my T-Rex 700 Jet (Wren 44), just before take off, while trying the controls, as soon as given slowly full left rudder I heard a "ra-ta-ta-ta-ta" warring noise.

Stopped the hely and everything looked perfect, gears, transmission, everything....until the moment when I holder the tail rotor with my hand and I hears a decides"tak" step while trying to apply some torque in clock-wise direction (seen from blades side).

I think problem is in the main gear one way bearing, that does not slip...but jumps 1 step at a time ?

Could it be ?

I checkes all bevel and gears from tail rotor to main gear (marking then with dark pen) and no slippages there. So, I guess the only thing is slips while forcing tail rotor cw must be main gear one way bearing.

Strange thing is that my mechanic is very new and correctly mounted T-Rex 700N 3G (but with flybar head).

I've also T-Rex 700N , 700E and 700E F3C and so far I never experienced such a problem on main gear one way bearing.

Also, I do not fly 3d, but gentle and smooth scale flight.

Finally, would KDE upgrade solve my issue ?

Any consideration or suggestions from you is very appreciated

Kind regards
Denis Ferrari

[K2Freak]

Those one ways are known to give up the ghost quickly on occasion, but it also sounds like you may not have the boom pushed in far enough. I have only seen the OWB slip smoothly.

Were you able to get both the tail mounting bracket (on bolts that go through the vertical fin) and the 4mm screw that secures the front right side of the boom installed smoothly? i.e. the bolt went into the hole?

[DenisFerrari]

Originally Posted by K2Freak

Those one ways are known to give up the ghost quickly on occasion, but it also sounds like you may not have the boom pushed in far enough. I have only seen the OWB slip smoothly.

Were you able to get both the tail mounting bracket (on bolts that go through the vertical fin) and the 4mm screw that secures the front right side of the boom installed smoothly? i.e. the bolt went into the hold?

Hi,
thanks for the reply,
To mee too, one way bearing should slip..not "stepping" or "jumping"...anyway, I've checked and the boom is well in for sure ... on 700N there's also the side screw on the boom entering on the plastic hub, that fits inside side hole. I'm sure that bevels gears there are tight and perfect, no gears slipping or stepping there. Nor in tail gears area.

[Giant_Scale_Gasser]

I experienced this on my 550e. What I found out was when I went to idle-up from standard throttle mode, the head speed was so slow in standard that the sudden jolt of power up would cause the one way to slip. I figured out that it's easier on the equipment to raise the throttle curve much closer to my idle up setting so there wasn't a big spike in the power.

I realized this when I watched back a GoPro vid i made and heard the whole event.

I am sure you guys know way more about this than I do.

[StatiC]

If you only fly in gov mode (more specifically if have a straight across throttle curve in idle1 and idle2) and have a transmitter like the DX9 you can set it so that going from normal to stunt1 and stunt1 to stunt2 has a slowly increasing throttle. I did this on my helis just so that it is easier on the mechanics. Look at the servo menu under speed. I set mine to increase throttle from normal -> stunt1 and stunt1 -> stunt2 over a 2 second time period.

This of course doesn't fix your problem it just tries to keep it from happening. I would worry that you could trigger the slippage again during flight or maybe with easier flying. Re-gluing that sleeve was not fun for me though... I had to borrow someone's small harbor freight press when I did mine. I used epoxy as I never wanted to do it again.

[wc_wickedclown]

Originally Posted by KDE Direct

Hey Guys,

I know this is an age-old thread, but the problems are still commonly happening and wanted to get this solved, especially with the higher-power systems we are pushing these days.

http://www.kdedirect.com/TREX700OWBM.html

Machined from a single-piece of Stainless Steel 440C, hardened to bearing-quality HRC 60 levels, there's no more chance of failure.

would i still have to drill 3 holes and insert grub screws with this upgrade ?

[ddj74]

No modifications needed. There's no sleeve at all anymore.

[wc_wickedclown]

Originally Posted by ddj74

No modifications needed. There's no sleeve at all anymore.

no sleeve
get out awesome thank you

[lavaandy]

Originally Posted by ddj74

No modifications needed. There's no sleeve at all anymore.

Do you know when this started ? I got my kit at x-mas it is a dfc pro red 800 motor

[ddj74]

He's talking about a KDE upgrade OWB not the stock one. Stock OWB still has the sleeve.

[ranchhand]

I saw one slip on an Align pilots 700 DFC Pro, he now has the KDE OWB, shhh, don't tell anyone

[cjennjr]

Quick question regarding one way bearings - on my 700 F3C, when I rotate my rotor in the opposite direction, there is no grab whatsoever; just free rotation. Does this means my one way bearing is bad? I continue to lose power less than a minute into flight...

[ddj74]

I would say yes it's slipping or put in backwards.

[cjennjr]

The bearing was installed at the factory, so I'll chalk it up to a bad bearing and order a new one. Thanks...

[ddj74]

If just replacing the bearing buy this one...

http://www.rcbearings.com/products/f...y-bearing.html

When you get the kit your suppose to take it apart and grease the OWB. So if you never took it apart i would chalk it up to failure due to lack of proper greasing.

[PetJumper]

Originally Posted by ddj74

If just replacing the bearing buy this one...

http://www.rcbearings.com/products/f...y-bearing.html

When you get the kit your suppose to take it apart and grease the OWB. So if you never took it apart i would chalk it up to failure due to lack of proper greasing.

No greasing required for OWBs - does no harm if done right (no teflon etc.) but doesn't help either.

[cjennjr]

Yeah, that's what I thought - no grease on the OWB. You could use a drop of bearing oil, but no grease. I will take my OWB apart for inspection and probable repair.

[ddj74]

Apply grease or not I don't care that's what it says in the manual...