proptwister
Senior Heliman
Location: SW Missouri
| I helped Lenny with his EVO 50 and have seen it do it twice now.
Last week we bent the spindle but I can see that one happening as we had a finicky YS50 that got in a bit of a overspeed condition and while lowering the throttle, got in a VERY bad out-of-track condition. Very much like the woof-and-poof that was occasionaly seen on my old Raptor V1. I then told him about lubing the dampners, spindle, ect that was used to help the V1 issue. Spindle was replaced.
Last night I flew it around for him and it seemed to fly just fine. No vibration, out of track, or balance issues. He did very well for his first two forward flights and I thought we had corrected the issue with the lube and maintainance. On a straight a level pass during the third flight I heard it start to flutter again. I quickly took the radio and turned it back toward the field. With very little collective and the heli coming down quickly, it was VERY evident the blades were WAY out of track again. I set the heli down gently and from across the field, you could see the bend in the spindle. When we pulled the canopy off, it had shook so hard that the collective servo spline had snapped and the screw was the only thing holding the arm in place.
I agree that the 811 is marginal and needs to be replaced with a stronger servo. But any idea's on the woof issue? I'm beginning to think the servo is giving up and letting it flutter. I have a EVO 50 and 90 and have never had this problem with the Hirobo's. Any help would be appreciated.
Sincerely,
Matt
Evo 90 OS C-Spec 91 w/OMI Mod
Evo 50 OS Hyper 50
JR 9303
Wildcat Fuel |
