for oil carrying tubes not shown in some embodiments these tubes may be insulated additionally or alternatively interior cavity 306 may be insulated the size of cavity 306 may affect the design characteristics of strut 300 by causing the strut to have an aerodynamically undesirable width pressurized air 301 may enter space 302 and be emitted into the gas flow path of the engine thereby increasing the effective aerodynamic length of the strut 300 along the gas flow path fig4 is a schematic top view of a strut 400 without ports for emitting pressurized air in this embodiment the gas flow path 410 flows around the outer surface 402 of the strut 400 note that the main flow separates from the outer surface in a vicinity of the location of maximum thickness of the strut in this view the strut 400 has a width w and an aerodynamic length of ll and an aspect ratio of about 2 1 fig5 is a top view of a strut 500 having ports for emitting pressurized air this embodiment includes an interior 502 and ports 504 pressurized air is emitted from ports 504 and creates a recirculation bubble at location 506 along the outer surface 508 of the strut 500 the recirculation bubble influences the gas flow path depicted by the arrows 510 in the embodiment of fig5 the downstream portion 512 of the strut 500 has a tapered shape formed by opposing concave surfaces this shape can have the effect of trapping the recirculation bubbles along the outer surface 508 of the strut 500 thereby urging gas travelling along the gas flow path 510 away from the outer surface 508 of the strut 500.