Last year I reviewed the 2013 Starboard High Aspect -
www.seabreeze.com.au/forums/Stand-Up-Paddle/Review/2013-Starboard-High-Aspect-Foil-Paddle/
This is a great paddle, but was due for a few updates for 2014. The blade angle was too great at 13 degrees and the blade stiffness was quite flexible. I was very excited to hear that the 2014 model was backed off to a 10 degree blade angle, the blade stiffness was also addressed. Both these factors in the 2013 paddle meant the blade 'washed out' in the second half of the stroke - requiring greater shaft angle forward to counteract - easy technique modification.
I had the 550cm2 blade size from 2013, and went for the large 545cm2 2014 HA - as the blade size written on the paddle matched up. Now I'm still not sure how Starboard measure their blade size, but this blade did not feel anything like my 2013 HA. I felt like I pulled through the water and couldn't power up in the 2nd half, which was the great thing about this type of blade - as you went deep, it powered up (except the excessive blade angle - explained earlier). I persisted for a couple of weeks, but couldn't find my mojo with it.
I recently had the opportunity to try the XL - 625cm2, technically 75cm2 bigger then the 550. Starboard have 4 blade sizes in their range - small, medium, large and extra large. The width stays the same at 16cm, only the length changes from each size. I wasn't sure if this was a great progression, as 16cm seems very narrow. In saying that I had noticed alot of paddlers seemed to be going very well with the large and medium blades. Being a large guy, I have always preferred a slightly larger blade, which is why i went the 550 last year. One session with the 2014 XL HA, I had my mojo back and suddenly the range all made sense......with the exception of the way they are sized.

I have traced out a comparison of the area difference between the 2013 550cm2 and 2014 625cm2 blades. As you can see below, there doesn't really seem to be much area change once you take off the wings and add that area to the bottom. Essentially the blades are identical at the top of the blade. There definitely not 75cm2 worth.
I really rate the High Aspect Design and Starboard have ultimately nailed it here - low load catch, deep power up and easy lateral release with the slim blade (pretty well one of the slimest blades on the market as I can see). It works for me...for those that may have tried this paddle and felt it didn't work. Try the next size up.
Note - Yep, I'm a starboard team rider, so take my review with a grain of sea salt if you wish. This is directed at the paddlers that are into High Aspect paddles and may have been confused (as I was) on the 2014 sizing. Hope this helps

