Neo wrote:sailboatmike wrote:My mast has a ring for a spinnaker pole, I dont think it weakens it really
I'm really concerned about a track because it'll have multiple fixing holes the whole length. ... I guess I could just have two simple bullnose rings. One for the Jib and one for the Genoa (at different heights).
But I'm still wondering why it needs to come off the mast face? Because the Genoa Sheet would hold the top of the pole (and the chew) "down and back" regardless.
I think you're overthinking this. The aerodynamics of the rotating mast aren't going to be reduced with the wind off the beam or stern, which is about the only points of sail you'd normally use the whisker pole anyway, and not in heavy air unless it's a robust pole. The small holes for a track or ring aren't going to reduce the net section of the mast by much, and other than when raising the mast with the M-style MRS (attached 6 ft up from the base), there isn't likely to be much fore-aft bending moment in that area of the mast anyway (side-to-side puts no bending stress in the face of the mast). The added 6 ft of metal on the face of the mast also reinforces against fore/aft bending anyway, assuming a track (I thought, in my previous response, that you already had a track there, though I guess I was mistaken).
If you terminate the whisker pole at the base of the mast, you'll lose a lot of vertical control of the clew. Much of the downward force component of the sheet will be reacted by the whisker pole in compression, so you won't have much down force on the clew from the sheet unless the foot also pulls down, but I don't think there's much of an angle there. Think of a triangle structure (or sheet) pivoting at the jib car on the cabin roof and the base of the whisker pole - it's a rigid triangle, hinged at those two points (or along a line between them). The clew can't move fore/aft, but it can move up/down as the 'triangle' hinges.
Having the pole horizontal means it doesn't react any of the vertical component of the sheet, and only be able to push straight outward, depending on how it's sheeted (the clew raises as the sail 'pumps', which they tend to do without a downhaul). If the sail pumps too much at a particular point of sail, you can add a downhaul, which can even be the lee sheet, to hold it down and prevent pumping in a seaway.
If you look at the picture above of my whisker pole, I even used the spinnaker halyard to carry the weight (and to help not drop it overboard, as it was heavy), but no downhaul at the time the pic was taken. But if the pole was attached at the mast base, the sail would have been pumping badly, as it tended to do under certain circumstances anyway without a downhaul, but with much of the jib sheet downforce cancelled by compression in the pole, it would be difficult to control.
Admittedly I've never tried a whisker pole terminated at the mast base, but you could certainly test it without making anything. Just strap it in place, put a large enough loop in the sheet termination at the clew (use a bowline, and leave a generous loop), and use a boat hook with enough length to pole out the jib. I believe the "J" dimension is only about 10 ft, so a 12 ft pole should be enough to experiment with using the jib. You can also try poling it out horizontally by butting the pole against the mast and tying it. Or tape it to the mast. It's just an experiment. And remember that you would probably want to change its length depending on point of sail and wind conditions.
Don't try using a light duty pole in a stiff wind, though. There can be a lot of force in that pole, and it's easy to buckle a skinny pole, and the tendency to buckle grows exponentially with length.
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with main & two head sail,s wing on wing notice the both poles r on the same mast mounted ring no need for two ring,s enjoy 
