Swash Cam Video : 800e Trekker One Way Bearing Failure

[hidaven]

Great points Don. Just my lay persons opinion, I don't thinktheOWB is beefy enough for the shaft size swinging 800mm blades. Isn't the logo 800 's OWB more robust than this? I think this OWB was just enough on the 700. I think the 800 is going to be a challenge. Hopefully KDE will come upwithsomething.......keep me posted as its winter here and your weather is better right now for testing : )

[nu66ie]

I have about a dozen flights with the KDE OWB mount and the new black CNC main gear and all is good so far. I did notice the mesh tighten up after the new main gear was installed. The stock gear was slowly wearing as I had white dust after about every flight.

[hidaven]

I have the new gear as well...........My other concern is your dampner problems. is there a trueblood or equivilent to upgrade to????? I hope the idea of stretching a 700 to an 800 was the right idea here as the increased blade mass is not playing well with 700 sized components........

[nu66ie]

I replaced the all of the parts that fit on the spindle as well as the spindle. It seems to have become a little tighter after many flights. There could have been a bad run of any of these parts. I really don't know. Iv''e seen some of the TrueBlood dampers and they don't seem as rigid as the DFC dampers. All I know is they were so loose that they fell out of the main rotor housing on their own when I pulled the grips off. (both sets)
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[PetJumper]

Originally Posted by nu66ie

...
When you pull a cork from a wine bottle, you cannot just pull it straight out, it must be twisted and pulled at the same time. That minuscule amount of movement where the OWB slides up and down on the OWB shaft is enough to allow slippage. This probably is happening more than you hear and eventually the OWB shaft and or OWB will fail.
...

I think, that is a beautiful and vary valid explanation of the issue here! And we have to keep one more thing in mind - slant (helical) gears produce substantial diagonal loads on all bearings - motor, main shaft, OWB. That slanting force will tilt the bearing case against the sprague. If the bearing case doesn't hold the sprague firmly in place, the bearing will slip.

Rgds
Peter

[Madryan]

my 700e did this ... im surprised they didn't update the part for the 800E ... i had to heat up my OWB and the steel case popped out there was virtually no green loctite on it.. i drilled 4 holes in the alloy and counter sunk the steel sleeve at each point.. green loctite the sleeve back in and green loctite the grub screws into the collar... never ever slipped again.. looks like i will need to do same on this ..grrr...

My 800MX motor just arrived so im def going to have to mod the OWB with 11KW on tap :-D



cheers

[nu66ie]

Let us know how that 800MX performs, many of us here are curious.

The OWB slipping issues on the 800e were coming from the top of the case being pulled off. The six button heads that hold the top of the case together were being pulled out of their threads. And once this happened, they would no longer hold and once the case top pulled out just a tiny bit, the bearing would slip.

If you ever see tiny drops of lube around the seam between the two case halves, an autorotation is in the making.

The steel KDE case has fixed those issues. Steel bolts into steel threads was needed to keep it together under the loads the 800mm blades put on it. I have over 100 flights with the KDE OWB case and no slippage yet.

[Madryan]

Sounds like I will need to go the kde then....IM not putting the 800mx motor on it until I have a good owb IM using 5200 45 c batteries so that's plenty of juice for my sport and not so wild 3d just have to see how it goes.

Cheers

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