The F-27 has a fixed mast. The "formula" designation you might see includes a fat head main, bigger jib, asym spin and screacher.

You can modify the F-27 to add a rotating rig (the 28 rig should work) - but, Farrier's take on it is that the rear beams on the 27 are not engineered as strong as those on the 28, and that the rotating rig puts more strain on the back beams. But then he goes on to say that there's a large margin designed in, so you're most likely ok, but those with rotating rig mods should watch the rear beams for problems.

That having been said, I've not read on any of the forums of anybody ever having problems with the rear beams. But I also get the feeling that not too many people have done this mod anyway (you out there Tami?).

The mod done to the rig more often is adding another set of spreaders up higher to better control the mast, and add a little pre-bend. This also allows the elimination of the baby stay. Add some decent rags and you may end up not missing the rotating rig that much.

I kind of had the same thoughts about the fixed mast, but I have to say it doesn't bother me anymore. The mast raising and lowering couldn't be any simpler with the stock rig, and in the end you may find the performance of the boat is just about right for what you're doing with it. I also realize with mine that there are so many other factors that would negate the rotating mast - my experience sailing the boat being at the top of the list...

But after having sailed the boat - I think the biggest reason I'd have now for doing a rotating rig is that it would eliminate the lower shrouds and would make moving about the deck easier as a result.

I'd say - get the cleanest example of the boat you can find for your dime, learn to enjoy it, then see if you still want to go for the rotating mod. If you do, then go for it. I wouldn't make it a deal-breaker going into it.