I´m not a mechanic however I learned that if you suspect blade delamination a quick check could be done by doing a "tap" test, using a US quarter (25 cent) and knocking the blade listening for hollow sound!
In regard to you asking about metal blades and why delamination applies I suspect that the blades are glued together in the same way as R-22 blades and therefore subject to delamination.
May I also suggest that you look at H-300 and R-22 if you are looking for a piston helicopter, both very reliable.
Last edited by Aesir; 11th December 2004 at 16:52.