Re: [Amel Yacht Owners] Wind or Water generator

eric freedman

Hi David,

How high above the mast head does the wind gen have to be to clear the triadic stay?

Fair Winds


Kimberlite Amel Super Maramu #376



From: amelyachtowners@... [mailto:amelyachtowners@...]
Sent: Sunday, April 08, 2018 4:48 PM
To: amelyachtowners@...
Subject: Re: [Amel Yacht Owners] Wind or Water generator



Hi Danny,

Thanks for the concern, and dialogue.  Sorry about the cold-sweats.  I agree, needing to rotate the unit out-of-wind &/or to physically tether the blades due to an operating limitation/requirement, is not a viable option for anything mounted above, say, 2 meters.  That is not the case here.

I am not thinking on doing a mast-climb to lower the wind-turbine at sea or in adverse conditions.

What I am thinking is to lower the unit (or remove the blades) if hauling out, or leaving the boat, for an extended period in a high-wind-prone area/season.  Not just for the survivability of the unit itself, but because of the wind-loads such additions would place on the attachment points, mast, and boat as a whole. Just as one would for solar panels, or other removable deck-ware.  It may be that the insurance company requires the masts to be taken off if secured on-land in the hurricane belt in-season, in which case this aspect becomes moot.

As an aside, in addition to a manual switch that stops/slows the blades (by shorting out the coils), the Rutland 1200 starts to electronically self-limit at wind-speeds above 35 knots (or when charging current is no longer needed). To my mind this is better than simply letting the the blades spin to dump excess current to a resistive load (&/or trying to slow/stop a rotor already exposed to high winds).  I have heard of Rutland 1200 units successfully self-limiting and surviving hurricane-force winds.  On that basis, I reckon that the unit can stay up in all conditions I am likely to encounter at sea.  Of course, as we have seen with IRMA, nothing, not even the masts themselves, can necessarily survive a full-on Cat5 or, more properly, the debris that is often associated with such conditions.

Perigee, SM#396
St Maarten

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