I have seen three mounting methods for freestanding masts that rotate.
One is to have bearing at the deck and base in the keel. Hence the height of the hull sets the mast "bury" for the lever supporting the mast.
The second method is to have a high rigidity stub mast that is steeped on the bottom of the hull and secured/sealed where it passes through the deck. The stub has a bearing at the top and at the deck. These bearings are seated in the mast.
The first method has a single long mast whereas the second has the stub plus a shorter mast.
The third method has a tube inserted down through the deck and secured in place. The tube has a bearing in the bottom and bearing at the top of the tube or above the tube in the case of the Hobie sail/pedal trimaran. This method avoids leaks down the mast and into the hull as water stays trapped in the tube.
On 27/04/2016, at 7:01 AM, "lucsimard@ymail.com [harryproa]" <harryproa@yahoogroups.com.au> wrote:
Are HP masts stepped over the stump tube down to the top of the deck ?
Any problems foreseen if the masts are stepped inside the stump tube down to the bottom of the hull ? The longer the length between bearings the smaller they would be I guess ...
What is the usual distance between bearings on a HP?
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Posted by: Rick Willoughby <rickwill@bigpond.net.au>
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