I put a spi set on my Dart 18. You don't necessarily need a crew to use it and I did singlehand quite often. Unfortunately, there are no photo's in the archives showing it flying. In the photo below the spi is safely in the bag, after 3 capsizes we thought it was the best place for it!!! However, it was windy that day. If you predominately sail in light to medium winds it is a good toy. Darts aren't exactly the most technical Cats to sail so having a spi was a lot more fun. Righting the Dart singlehanded was near impossible in very light winds and I had to use the tramp bag on a couple of occasions but I'm fairly light 158lbs.

I said it was windy, check out the rooster tail on the Dart behind