Phase Adjustment Ring

[vandelescrow]

On the Raptor 50 SE, what does the Phase Adjustment Ring adjust? The manual does not say anything about what position this should be placed on the bottom of the rotor hub other than the drawing.

I would predict this would change where in the rotation of the hub the paddles will deflect. So they will deflect early or late. What would be the benefit of changing its orientation from where other head configurations are?

If you don’t know the part I’m referring to, it mounts on the bottom of the rotor hub and holds the pins that go into the washout base. Item number BK0555 listed with part PV0484. Step 11 in the manual.

[ShawnK]

What would be the benefit of changing its orientation from where other head configurations are?


None. If the phase adjustment ring isn't adjusted correctly, your helicopter won't track straight. There is no "benefit" from having it adjusted anything other than straight.

The process is simple in theory, but takes some time to get dialed in. To start, loosen the bolt that clamps your phasing ring, rotate your head assembly so that your flybar is perfectly in line with your tail boom, and adjust your phasing ring so that the inner and outer balls on the swashplate are perfectly in line. Theoretically, your inputs to the swash will cause a reaction in the rotor disk 90 degrees later. I say "theoretically" because it can be a degree or two off, depending on how your blades lead/lag, the amount of slop in your system, etc. We're talking small differences here, but differences nonetheless.

Now comes the hard part...

Can you do stationary flips? This is the easiest way to check your phasing. Ideally, do it when there's no wind outside. Just do stationary flips back to back, with a focus on making as pure an elevator input as possible (if you put in aileron, you'll give yourself a "false" reading). Note your helicopter's behavior during the stationary flip. Does it tend to roll left a little bit? Loosen your phasing ring and rotate it slightly clockwise. If it rolls to the right, rotate it slightly counterclockwise. Keep repeating until it flips straight, and you'll know that your phasing is optimized.

(NOTE: This process applies only to helicopters with a clockwise rotation. For helis with a counterclockwise rotating rotor, left rolls need a counterclockwise rotation of the phase ring, and right rolls need clockwise.)

[Ronbo]

good info, i was wondering the same on my stinger head equipped raptor v1 today while doing flips. wind and how i entered the flip perhaps not quite skids level could have given me a false reading. thanks.

[vandelescrow]

Thank you. I am not evolved yet with my flying to go upside down but you answered my question and how to set it. Thanks

[Teej]

Don't forget to align the tailboom and grease the relative bearing. :)

[capebob]

And of course you must remember to oil the muffler bearing. :D

[ferincr]

And of course you must remember to oil the muffler bearing. :D
Ha!, which one would that be ?
The one between the muffler and the engine, or the one between the muffler and the rubber thingy at the end?