Interesting thread. I wear a helmet bicycling--have for many years, although also for many years, I didn't. It wasn't until my first Ride the Rockies, which required all riders to wear helmets.
My Sis got some serious injuries on her bicycle on the Ride the Rockies several years ago, and her split helmet very likely saved her life, or if not her life
per se, her livelihood thereafter. I'm very careful to wear seatbelts/shoulder harnesses when I drive, and a very early purchase for my airplane was BAS harnesses.
I wear a shorty helmet on my Vespa (no snide comments--it's a whole lot more fun than any Harley!), and when I had a bigger motorcycle (Kawasaki Voyager XII), it was a full face helmet. The only motorcycle accident I've had, though, was before I bought my first helmet--my injuries were minimized because I was sliding on ice!
But I haven't yet graduated to wearing a helmet in the airplane. Should I? I don't really know. I certainly don't have any
rational arguments one way or the other. I have what are probably
irrational arguments: comfort, overheating, previous neck surgery, the need to buy for all passengers, etc.
Regarding passengers, it's been my experience that it's hard enough to get them to wear appropriate shoes if they have to walk out of a field in the event of an off-airport landing, let alone try to convince them to wear a helmet inside an enclosed airplane. Seatbelts are so
de rigueur these days that convincing passengers, whether in cars or in airplanes, to wear them isn't difficult, but us old farts like Jim (Contact) and Mike (MTV) and I can easily remember when persuading passengers in cars to wear them was like pulling teeth without Novocaine.
Whenever I'm eating at the Barnstormer at GXY and the Flight For Life helicopter comes in for fuel, all of them are wearing helmets. Do they put helmets on their patients? I don't know. I suspect that their patients wouldn't object or really don't care--they just want to get to the hospital, if they're conscious. On the other hand, with all the press about the fire danger from ruptured fuel tanks of helicopters when they crash, I'm not so sure that helmets make any difference; it's not crashing that makes the difference.
That's the real key to whether a helmet is necessary. Let's just don't crash, agreed?
Cary