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 {HEAD ~ the thicker, non perforated material} of {TAIL ~ the blade aerofoil}  
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 { HEAD ~ the thicker , non perforated material } of { TAIL ~ the blade aerofoil }
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