hunter 310 hum

[Steve Dion]

hi, i just purchased a 1999 310. we sailed her around the islan thrugh manhaten and it was incredable. we noticed a hum on a starboard tack at around 4 knots. is this a sound that is characteristic with my model.i always had a hum with my 25 swing keel. thanks alan

 

[Mike8245]

did you have the trans in

reverse? Sometimes the shaft turning when in neutral will make a hum.

 

[Benny]

Reefing lines or Lazy Jacks?

Oscillating reefing lines or lazy jacks could cause a hum. Also shrouds may hum at certain frequencies.

 

[Jerry]

Can you name that tune...

The vibration on my 310 would become audible at about 3.8 to 4.1 knots and was the result of the combination of a roller furling main mast and shroud tension. The vibration was initially most pronounced on a starboard tack and was reduced by increasing the tension on the port shroud. This took several attempts during the intial sea trials to get the shroud tensions setup. I don't profess to understand the mechanics of what was causing the vibration but I was concerned that uncorrected it would most likely cause a premature failure of the rig. Vibration in any mechanical system usually is not a good thing especially when it reaches audio frequencies.