Stern or Prop issue On 90 turns

[Tail_Gunner]

Just as she states, put a new prop on it ( 4 blade ss which i am very satisfied with) and it has begun to or something has begun to create a fairly good rumble....oscilation type of nosie on either a hard right or left turn while running @ very low rpm. And yes im trimmed all the down, trim angle dosnt seem to matter and the unit has only 60 hrs on it? ( no apparent problems @ planning speed)

 

[ziggy]

Re: Stern or Prop issue On 90 turns

have ya put the old prop back on and see if it does the same thing. the osilateing and rumbleing. that might confirm if it's a stern or prop issue........

 

[Haut Medoc]

Re: Stern or Prop issue On 90 turns

What he said, but I would check The u joints for proper lube.....
Then the gimbal bearing......JK

 

[Tail_Gunner]

Re: Stern or Prop issue On 90 turns

have ya put the old prop back on and see if it does the same thing. the osilateing and rumbleing. that might confirm if it's a stern or prop issue........

Beter said could a 15 pound peice of steel create a imbalance only on a hard turn? Im afraid my knuckels became dry.

 

[Zackman]

Re: Stern or Prop issue On 90 turns

Imbalance of the impeller will certainly cause vibration. Vibration due to imbalance should get worse with increased rpms (actually to the square of angular velocity).

Oscillating vibration is typically associated with two vibration frequencies comming in and out of phase with one an other. Sometimes called beat frequency.