I have a T-Rex 450 XL CDE. After about a minute of flight, hover and forward, no 3d, the motor revs and the rex falls, i loose altitude and land. I've checked the pinion, its tight, i was thinking it could be my 1-way bearing. am i right to think it would make me loose power while the motor revs?

Check the One way bearing, the screw holding the gear to the mainshaft, & the pinion mesh to the maingear.

Lloyd

all screws are tight, and how do i check the 1 way bearing?

Be certain it "locks" when you turn the drive gear clockwise (from the top), (ie: the tail drive pully turns), and when you turn the tail drive pully clockwise, the main drive gear doesn't turn.

Lloyd

Spun it, it locks, I have the Align 420 LF motor and a CC35 speed control, could it be that, it felt really hot when i landed.

It's probably the one way bearing. Sometimes they intermittently slip when they are worn. Don't think it's the ESC, they usually shut down for a second instead of increasing revs.

The CC35 should not be Hot. Mine rarely gets warm after a 13 min flight. Might have a bad Motor or ESC, or improperly pgm'd ESC.

Lloyd

Then again, the only other thing left is the one way bearing if all else is goon!!!

Lloyd

I too have had a problem with my one way bearin, it of course happened only after a moderate crash. Does the heli make a high pitched whinning/slightly grindy sound out of no where? When my one way slipped it made that noise.

I had a similar problem on my X400 Pro, (upgraded to basicaly a T-Rex 450XL) it would spin up, I could hover and every so often the power would surge then cut and the heli would drop. I ran it up while holding the heli and spun it up and down, or holding constant revs - and it was solid. Finally I put the heli on a smooth large table where it could slide and spin around with the tail and ran it up and just held it below a lift-off-hover and then it cut out again. (so I thought that this really looks like EMI, electrical-magnetic-interference) so I removed the ESC connector from reciever and wrapped it thru a ferrite donut about 10 times. (I used a 33uH M9863-ND from digi-key.com and removed the existing mag wire first) and now it's as steady as a rock - even with the flight battery mostly discharged.

fixed the falling! it was the 1-way bearing. as far as getting hot, my Align 420 LF fell apart while flying, i landed my first auto!!!! soo cool, upgraded to a Hyperion YH22 and like it for now.

Wait Flytoolow,
What do you mean the 420lf FELL APART on you?[X(]
Now you've got me paranoid that mine will do it (at of course the most inopportune moment like lets say...the top of a loop or roll???)
How much was the motor you bought and how do you like it?

Hi, apparently the end-caps of the 420lf separate and the motor de-cans - I did a web search on this and there are a goodly number of entrys that seem to make this not a fluke but a real problem. Align now put screws on the end-caps on the 430 - but one thing you can do is use tie-wraps around each end of the 420, (almost covering the crack-interface between the motor and the caps) and carefully flow a good grade CA between the tie-wrap and the crack. (when my 420 wears out I will replace it with a Align 430 or JGF 450TH anyway - so no need to be able to open it in the future)