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Two person helmet.

A shared social helmet.
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Two person crash helmet.

I bought a bluetooth intercom so I could talk to my passenger but it was difficult to reliably pair the devices, the controls were clunky and one of the headsets failed. I remember an acoustic intercom that used rubber tubes but I think the company might be out of business.

So I propose a two person crash helmet. It would look something like a small upside-down bath but some sort of stylish graphics could make it less stylistically challenged. It would have a normal visor at the front for the rider and side windows for the passenger. I like to think you could hold a relaxed conversation in a cocoon of still, quiet air, maybe listen to some calming music and share happy moments together. There could be enough space between the wearer's heads for drinks and snacks. There could also be aerodynamic advantages.

In case of an accident I suppose it might be better not to be joined to your riding partner by the head so maybe some explosive bolts could separate the two halves.

The same idea would also be great for tandem cyclists and being linked at the head could help captain and stoker to synchronise pedalling and body dynamics.

The idea would work for any vigorous activity where two (or more!) people participate one behind the other although I can't really think of any. Oh - bobsleigh?

Rusto, Mar 15 2019

Motorcycle tricks http://s281.photobu...ecent]=1&sort=1&o=0
Just a thought. [wjt, Mar 16 2019]

Motorcycle helmet voicepipes http://www.douglas-...voicepipe.htm#speak
Mentioned in my anno. Scroll down until you see it. This page has lots of other voicepipes too. [notexactly, Mar 17 2019]

[link]






       "No no, it's fine really, those are just the explosive bolts...A bit close to your eyes? Yes, well, it'll be fine."   

       But I do like the idea for tandem cyclists - it would reduce drag. Oh, and congratulations on your first post!
MaxwellBuchanan, Mar 15 2019
  

       For added stability, you could fix the helmet onto the frame of the bike, and for convenience, have hinged segments allowing entrance and exit. This might make the helmet somewhat bulky, so you could always widen the footprint of the bike, perhaps by arranging another pair of wheels, in alignment with the first two, and slinging the helmet between both sets of wheels. This further extends the number of simultaneous users to a 2x2 configuration. I'm sure something like this could really catch on.
zen_tom, Mar 15 2019
  

       What about a wide hose that goes from the side of one helmet to the side of another.   

       The helmets would be joined by a tube of air, but during a crash there would be a easy disconnection.   

       It would also reduce the amount of unexpected hickeys, a significant problem even zen's comprehensive solution does not address.
mylodon, Mar 16 2019
  

       this is making me think of a conjoined twins motorcycle
theircompetitor, Mar 16 2019
  

       I am with [mylodon] but for nice flows from art and science, from top to helmet top with swiveling ( passenger can look both sides), quick release connections.
wjt, Mar 16 2019
  

       // For added stability, you could fix the helmet onto the frame of the bike, and for convenience, have hinged segments allowing entrance and exit. This might make the helmet somewhat bulky, so you could always widen the footprint of the bike, perhaps by arranging another pair of wheels, in alignment with the first two, and slinging the helmet between both sets of wheels. This further extends the number of simultaneous users to a 2x2 configuration. I'm sure something like this could really catch on. //   

       My friend who doesn't join even though I think he should is always making comments like that when I ride my bike in inclement weather.   

       // What about a wide hose that goes from the side of one helmet to the side of another. //   

       I would say that's baked, except that the tubes I've seen are narrow: [link]   

       ETA: What I was thinking about on the 15th but forgot to say on the 17th is that, in a crash, you want your helmet to be as smooth and slippery as possible. If it catches on something on the ground, that applies a force to your neck. So even splitting in two in a crash would probably leave a bunch of deviation from a spheroid, on the back of the head for the front rider and on the front of the head for the back rider. Maybe it can be made as two smooth, spheroidal helmets that are joined by a third segment that gets blown off?
notexactly, Mar 17 2019
  
      
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