{HEAD ~ A turbine blade} has cooling air passageways and through the leading edge wall portion which are positionally arranged so as to intersect each other within the wall thickness so as to transmit mechanical stresses into the thicker, non perforated material of {TAIL ~ the blade aerofoil}  
{ HEAD ~ A turbine blade } has cooling air passageways and through the leading edge wall portion which are positionally arranged so as to intersect each other within the wall thickness so as to transmit mechanical stresses into the thicker , non perforated material of { TAIL ~ the blade aerofoil }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH