Thanks Dave,

I spent quite some time looking thru the net and this board the last days, but couldn't find any measurements for daggers, except some quite crude square one. Googleing the NACA key words was much fun. In case I find my old math books, I might understand parts of what I found there

What I'm looking for is just an idea about the shape. On one of the pictures I found the SOL CAT daggers looked quite amazingly formed with several curves ????

Thanks again