john_p_b
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 posted on 26/9/05 at 08:13 PM |
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crash helmet lifts at speed
as title really!
seeing as my car is getting upto the end of it's running in period i've started opening it up a bit more, got to just over 90mph (private
road of course officer) and the force trying to rip my helmet off my head was something else!
is it a case that this is just something i gotta get used to or is it down to a badly fitting helmet? the helmet crushes my ears as it is so i really
don't wanna go for anything tighter!
built a car, built a home, had a family. lost the family, lost the home, still got the car.
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David Jenkins
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| posted on 26/9/05 at 08:20 PM |
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I found a fairly simple solution...
... tilt your head forward! 
Bike helmet aerodynamics are set up for more of a head-down sort of position - sitting in your car with your head back just means your head gets blown
back.
I found that fitting a pair of Brookland-style areoscreens took a fair bit of the pressure off as well. Do you have any sort of flyscreen/wind
deflector?
David
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john_p_b
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| posted on 26/9/05 at 09:09 PM |
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i've got a wind deflector....in the loft bubble wrapped at the moment! one of them things i'm looking at getting on over winter when i
deciede which mirrors i'm going to replace mine with!
built a car, built a home, had a family. lost the family, lost the home, still got the car.
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benji106
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| posted on 26/9/05 at 10:22 PM |
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yes i find its not too bad on a bike unless you are the pillion, on the back of my dad's 'busa anything over 90mph starts pulling up on
the helmet. 160mph was horrible but i couldnt stop grinning
-Everything in excess-
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Avoneer
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| posted on 26/9/05 at 10:23 PM |
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Why does no-one make a stick on carbon or GRP spoiler for the top of helmets?
Pat...
P.S. I suffer from helmet lift as well.
No trees were killed in the sending of this message.
However a large number of electrons were terribly inconvenienced.
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indykid
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| posted on 26/9/05 at 11:32 PM |
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sparco do, although only for their helmets.
my takachi tk130x has a stall strip on the top, and i don't suffer with anything other than not being able to get my head off the back of the
seat at a ton, although that's the same with most of my upper torso.
my dad knows not to wave at people when we're on the motorway now too. his arm went up, then straight back over his shoulder. i pmsl, not good
when driving.
the air gets quite forceful at such speeds, so it's not surprising it'll shift even a tight fitting helmet.
tom
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rug
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| posted on 27/9/05 at 06:55 AM |
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Yeah, spoarco has top spoilers, and stabilizers, and all sorts of helemt accessories 
http://www.sparcousa.com/helmets_acc.asp
Maybe it can be used on other helmets? All helmets have almost the same shape, right?
/Carl
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derf
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| posted on 27/9/05 at 12:24 PM |
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What kind of helmet do you have? All my helmets had some sort of aero0dynamic wing on them except for a cheapo bell.
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Peteff
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| posted on 27/9/05 at 03:46 PM |
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Mine doesn't lift and my old one didn't either. Get one that pushes your cheeks in when it's new as it will loosen over time to a
more comfortable fit. They can be tight on the sides and still rock back and forth so check they don't turn or rock without taking your head
with them.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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Mix
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| posted on 27/9/05 at 05:20 PM |
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No helmet lift Pete!!
That'll be age or the drink then
Mick
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JoelP
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| posted on 27/9/05 at 05:34 PM |
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mine lifts in wadders car, but not im my own. The difference is the windscreen i guess, and maybe 30mph 
keep the strap tight!
Beware! Bourettes is binfectious.
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john_p_b
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| posted on 27/9/05 at 05:34 PM |
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quote:
Originally posted by derf
What kind of helmet do you have? All my helmets had some sort of aero0dynamic wing on them except for a cheapo bell.
it's a shoei txr, bit old now but wasn't cheap when new. has no kind of aerodynamics at all apart from a smooth shell
looks like i have 2 choices really, buy a new better designed helmet or go slow.......yeah right!
built a car, built a home, had a family. lost the family, lost the home, still got the car.
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Peteff
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| posted on 27/9/05 at 06:14 PM |
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No helmet lift Pete!!
I don't mean my purple helmet Mick  I've always had trouble with that lifting at the wrong time, usually first thing in the morning.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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JoelP
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| posted on 27/9/05 at 06:33 PM |
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polishing it can make it lift too... 
Beware! Bourettes is binfectious.
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jack trolley
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| posted on 27/9/05 at 07:43 PM |
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Helmet wind deflectors
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