Why does no one make a helmet with passive cooling?

Nothing worse than a hot sweaty helmet.

So, copper insert next to your head, connected via heat pipes to a big copoer fin or fins protruding from the helmet.

Airflow would cool it all down a treat.

Ideally have then adjustable. For long slow climbs up a hot mountain extend upwards for maximum air flow.

When riding along the flat, they would angle back to reduce drag.

Controlled wirelessly of course.

Probably because a helmets primary purpose is to protect the ride in the event of an accident and inserting copper and metallic heat sinks in there is going to turn it into a weapon come a crash.

Also, it’s pretty easily solved with vents anyway.

Big spiky tubes and fins next to your head in something designed to protect your head incase of a big impact?

That’s a great idea!

How would you crash safely in it?

Is there anything squashy that would so the same job as copper? Not sure I ride with a helmet that was full of potentially sharp stuff.

In the event of a crash they would provide additional crumple energy absorption. So they would actually be safer.

Have you tried squashing copper pipe with your bonce ? When ever I’ve hit my head off pipework under the floor …..it hurts and the pipe doesn’t deform at all.

Don’t be absurd. Water pipes are designed to withstand mains water pressure.

Early prototypes didn’t go down too well with the sponsored riders.

You could also use one of those metallic foams but that would not look as awesome.

Don’t be absurd. Water pipes are designed to withstand mains water pressure.

Ah so we are making pipes out of copper tinfoil now is that the plan ?

Why not just use a heatsink in the form of a balloon of water ….. If you crash you have an extra layer of crash protection which bursts on too high an impact thus indicating that your helmet needs replaced.

Just go fully active cooling. Solar fans ftw.

For ebikers fully active is the way to go.

A compressor hooked up to the battery and some piping is probably a couple of kilos in weight, so less than 1% of the overall system weight.

This gives almost as much funny as the guy changing his ebike with a wind turbine he proposes carrying to remote bivvy spots or the post about charging the e bike from some sort of turbo based charging system so he can pedal at night to charge his battery so he doesn’t have to pedal in the day.

Mainly as …. Ebikers don’t sweat that’s what the motors for 😉

Also, it’s pretty easily solved with vents anyway.

This.

For ebikers fully active is the way to go.

A compressor hooked up to the battery and some piping is probably a couple of kilos in weight, so less than 1% of the overall system weight.

You could also improve the ebike’s stability by putting four wheels on it and some kind of canopy to keep dry along with a more sophisticated air conditioning unit and……… oh hang on that’s a car.

https://images.app.goo.gl/sep9UgpgsEgmgQBr7

Surely the most efficient system would be some sort of evaporative cooling setup using airflow channelled through vents in the helmet to the head where they picked up moisture and cool the user?

You could even have an absorbent fiber mat on the head to aid evaporation.

Extra fluid could be kept in a small bottle on the frame.

all helmets I know use passive cooling

This gives almost as much funny as the guy changing his ebike with a wind turbine he proposes carrying to remote bivvy spots or the post about charging the e bike

Now now, thats enough of that. You dont want me to hit the ‘report’ button now do you ?, especially with the mods all riled up 😉

Besides, while the technical requirements arent there currently(pun), the concept is sound.

The detritus thinking cap?

Rip cuddy.

How heavy are ebikes if a coupe of kilos is less than 1% of the overall system weight?

How heavy are ebikes if a coupe of kilos is less than 1% of the overall system weight?

You forgot about the porker riding it 😉

Wear a wet light colour buff under your helmet – passive evaporative cooling.

Keep it wet with sweat, more so when you get hotter.

Sorted.

You could just take the helmet off for the long, slow, hot climbs. You know, like sensible people would do when faced with a simple problem. Or just not wear one like the whole world prior to the very late 80’s.

I tried removing my helmet for the climb up to Mt Umunum in California and got busted by a park ranger. They’re not optional in state parks.

Early prototypes didn’t go down too well with the sponsored riders.

Thats because he’s got it on sideways.

Just go fully active cooling. Solar fans ftw.

Banned, rightly for once, by the UCI because pros were pointing the fans backwards to both push themselves forwards and create turbulence trashing the aerodynamics for riders behind them.  If you looked carefully lead-out trains / domestiques on protection duty used to angle their fans outwards to create a bubble for the protected rider but create adverse airflow in the zones a competitor would enter when trying to attack them.

So, copper insert next to your head, connected via heat pipes to a big copoer fin or fins protruding from the helmet.

Big spiky tubes and fins next to your head in something designed to protect your head incase of a big impact?

Is there anything squashy that would so the same job as copper?

The solution is mercury. Obviously. It’s metallic and heavy so it’ll conduct heat away easily. Just bung a few pints of it into a used butty bag and pop it on your head. And as suggested by the water balloon chap it would also make a great shock absorber in case of a crash.

What about designing it with a slot so you can insert an ice pack? Sure it would make it a bit heavier and probably not as safe.

Or a little windmill on top that spins an internal fan?

Jokes aside, in response to the OP, I have no idea if it would work and if it did would work better than decent vents and channels

BinDun.

1970, so expired:
https://patents.google.com/patent/US3548415A/en

2006, but apparently abandoned (can’t think why, looks like genius)
https://patents.google.com/patent/US20080155991

In a first preferred embodiment of the present invention, a helmet includes a shell and a cooling module attached to the shell. The cooling module includes at least a heat pipe, at least thermoelectric cooler, and a film type solar cell. The shell has an outer surface and an inner surface. The heat pipe is embedded in the shell and includes an evaporating section and a condensing section.

What about designing it with a slot so you can insert an ice pack?

I’ve has an annoying undesirable characteristic of being pretty incompressible in its natural form.

Not something I’d want between me and the ground as an interface barrier