Experience with surfboard bike rack (or cart) I want to make (DYS) a rack or cart for carrying a surfboard on my bike. The idea would be to have space for only 1 board and being able to go as far as 150 km. So it should be as light as possible, comfortable and made of afordable materials (of course the combination will be located on an optimum non-perfect point). So, going through the internet I have seen a lot of different models, but I don't have any experience in relation to them. What configuration would you recommend me?  Depending on how the board is placed, I would be worry for being affected by the wind or making the bike and/or the cart inestable. Is the wind really a problem? I will use it in Scotland, so it could get windy. 

Some examples: http://www.thesurfingblog.com/surfboard-bike-rack-the-many-styles/  (site dead 2015-12-02)

I like this one (if it works) http://www.bettersurfthansorry.com/prod-39-1-1386/.htm However, it seems way too expensive for what it is.
I agree with Daniel R Hicks- go for a "Bob" trailer style- especially given the distances you're indicating you want to travel.  On the coast, there's always a breeze- and a surfboard turned broadside to the wind will turn your bike into a sail-a-bike and your 150km into what feels like 150,000km.

I'd hit some pawn shops or yard sales and look for one of those aluminum kid-trailers that clips to your rear frame.  You can disassemble the kid-carrying part and have a nice, low frame to strap not only your surfboard but other items you'll need for a trip that long as well.  The extra length of a trailer may not seem ideal to you at first, but I think after your first windy day to the beach, you'll appreciate the low-profile nature.  

Here's the type of trailer I'm talking about: http://compare.ebay.com/like/230660800807?var=lv&amp;ltyp=AllFixedPriceItemTypes&amp;var=sbar