No disrespect Dennis, but I always find it strange how some of these journals ask somebody who is not in the trade to do a piece on it??
Why don't you throw the offer out generally on here, you'd get some excellent snippets for your contribution.
By the way, in the UK they don't use the term medivac. Its either HEMS, or Air Ambulance. Medivac is the generic term.
Light twin: EC135 [flies 2 patients, reliable and maintenance is minimal.].
Medium: S76.
PS: Patients don't like aerobatics...OK