LWL = Length at Water Line.
I was asking what the length was, not what lwl meant.... Caleb, Thanks for answering the question.
As far as the speed; Sumner thanks for the PHRF ratings.
I posted my previous comment from my cell phone this morning which is why I didn't look any of that up myself, but I wanted to get the question of the facts out there to stop the emotional responses about if the boats are good or not.
my personal opinion is that they are very ugly boats, and as I have no need to trailer the boat, prefer something with a keel for better pointing and ability to handle weather. This however does not mean the Mac is a BAD boat, just not one that I would want as it does not suit MY needs. If I was sailing out west on lakes like the picture above, the mac (or the new Hunter Edge which I find equally displeasing to the eye) would make sense and be a good option to buy.
As to all the comments about how bad they sail, I would have lost money in a bar bet before reading this thread about the speed of the Mac's, but the PHRF rating shows that they are consistently capable of sailing to the hull speed of the boat, and are probably not bad light air sailors (I assume it's because they weigh next to nothing), but due to that same light displacement that helps them to sail with such small sail plans, probably requires the reducing of canvas in air that many slightly larger boats just begin to get fun and come alive in.
On my boat with a similar LWL, but more than twice the displacement and a keel, I stop using the 250% drifter in favor of the 110% Genoa around 8kts, and will reef the main around 15-18kts (depending on what tack I'm on), and can comfortably sail with less than 10 degrees of heel under the reefed main alone still doing around 6kts up to winds of at least 25kts (I did just last weekend).
I suspect most Mac owners will think of being out in 25kts of wind with any canvas still up and imagine things on the verge of or actually breaking, water over the gunwale, and people scrambling to hang on.
The point being that a Mac is build for a completely different environment than a boat with a real keel that most people compare them to, and as such cannot be compared to one another. Macs are used primarily on large inland freshwater lakes and reservoirs, and only a small percentage of the macs out there sail on salt water or ever see actual ocean conditions. Take your 5 foot of draft to the keel out to many of the places macs are popular and see A) how well it sails in the lighter air, and B) how little of the water is usable with the deeper draft.
So knock them all you want, it's like saying oranges are horrible because you like apples.
(but I still think they are ugly)