Display Moretwice in my Slingshot and at 70 plus MPH I have been struck in the head by flying objects, One time by a rock kicked up by a vehicle in front of me and the other time by a huge June bug - - either of these would have been very painful at the least or could have caused my to wreck had I not been wearing my 1/2 helmet
In the slingshot you may not be at risk of falling off like on a 2 wheeled motorcycle, but there is no doubt that your head is much more exposed and open to injury than you are in a car or truck, especially if like me you like lower windshields you can look over
In the past there have been several times when I have seen debris in the road get thrown up by the tire of a car or truck right into the windshield of the car behind it. I personally have been in cars where once a lug nut was thrown into our windshield and another time her a 1.5 foot long chunk of a 2x4 was thrown into the windshield in either of these situations had it hit me in an unprotected head it would have probably killed me - especially the damn lug nut
every time you see something laying in the road, a rock, a tool, some piece of junk - - that is something that a tire could kick up and fire like a bullet right at your head and in a slingshot the very freedom and exposure to the wind and air that we all love means that projectile won't have anything to slow it down with the possible exception of a helmet
Now - as to the seatbelt issue, I installed a lap belt in my slingshot and do not normally use the shoulder belt as such my head should not snap forward at the neck like it would if my shoulders were restrained - - also I don't think the forces that I might be subjected to in most normal accidents would ever come close to the forces that race car drivers running at the 200 mph plus speeds would experience in an accident
Anyway if you don't want a helmet that's your choice and I respect your right to make that choice - I just hope everyone that does make that choice does so knowing everything that a helmet might protect them from, and not just thinking helmets are only for fall protection
I believe I had mentioned I had a rock hit me in the forehead last week with my helmet on. Non issue that would have been an issue. I agree its not about crashing its about road/wind noise and objects flying into your face.