Bow foil / spi rig questions for nacra 5.5

Hey,
I am rigging my recently aquired 1999 nacra 5.5 with a spi and have some questions. Any feedback in this area is appreciated.

A bowfoil came with my boat. But...after trying it on for size it sure does look small. Are there 2 sizes of bowfoil made for nacras? I am almost certain that there is a larger size. Should I worry about the bowfoil not doing its job (keeping the bows from towing in)? Or should I just use it. See pictures attached.

I am using a windsurfer mast for a spi pole and I am connecting the pole to the beam with I-20 hardware. I am trying to replicate the F-18 setup as much as possible since I am using an F-18 spi on the boat. What angle should the end of the spi pole make with the mast? Alternatively, how high should the pole be off the water. I've got the pole length right but the current bowfoil limits how high I can angle the pole. Perhaps with the correct size foil this would be a nonissue.

Eventually I would like to get an F-18 snuffer sock and hoop but being a college kid who just bought a boat I am all for creativity. In other words, I may be bag launching for a while.

P.S.
Anyone with an F-18 snuffer hoop or sock they want to sell CHEAP shoot me an e-mail.

Thanks

Sell the boat and buy an Isotope alan!
Trey
N20 873
www.velocitysailing.com

Are you going to run the Jib too? That is the only reason for the bridal foil. If you are not running a jib, I recomend you dump the foil and rig it exactly like the Nacra F17 w/spin. Use their angles and measurements. You need two lines at mid pole down to the forstay tabs, an anti gravity line up to the mast also to hold the pole up, you can then adjust the height to get it right.

I had a spin on my 5.5 Sloop, I tied the pole under the foil and that worked out about right for height, but you can adjust it down by tightening the pole tip lines to the bows.

You can see the tang angle for the bow forstays is different for the uni vs. the sloop, you can see the bridal foil wires do not line up very well with the tangs in the hulls, but I have seen other guys sail it like that and they didn't have any trouble.

What about having a new set of bridle wires made with a toggle on each end. That will help with the mis-alignment.

http://www.bosunsupplies.com/products2.cfm?product=S0737-0

Hi,
That is the correct foil for the boat. The only other foil that exists is for the Nacra 6.0NA (also used to convert a Nacra 5.8 to a Ncra 5.8NA), which is not correct for your boat.

If not using the jib, take the advice above.

Good luck

Steve
Hobie FX-1, Sail #211
(Former owner of 1993 and 1998 Nacra 5.5SL).