Give him a break!
The guy's got a young, small company in the middle of the herculean task of developing a brand new helicopter and getting it into production. He hasn't even delivered his first one yet and his order book's full without any marketing effort at all.
If I were him, I certainly wouldn't distract myself from the task in hand by spending hours concentrating on the mountain of enquiries (no doubt for the most part frivolous) he must be getting. Given he hasn't sold anything yet, the cost of employing someone to do it for him must make poor business sense. In a couple of years, if it should come to pass that he needs to actively sell the thing, it may be different.
IMHO, in this day and age of easy communication, too many people seem to feel they're owed a slice of other people's time.