It may be preferential that {TAIL ~ electrical conductors} and other elements passing through a portion of a hollow interior of the tubular body have a combined cross sectional area that is less than 40% of {HEAD ~ the cross sectional area} of the hollow interior of the tubular body to reduce flow impedance 
It may be preferential that { TAIL ~ electrical conductors } and other elements passing through a portion of a hollow interior of the tubular body have a combined cross sectional area that is less than 40 % of { HEAD ~ the cross sectional area } of the hollow interior of the tubular body to reduce flow impedance
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL 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 HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH