Top positive review
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Degree of effectiveness depends on circumstances
on 19 July 2015
Most reviews say this is great, some say it doesn't work, so I'll try to give a detailed explanation as to why in my experience I think that is.
Well firstly, it depends on your helmet design in the first place. If you have a very well sound-proofed helmet already you might not be able to tell much difference. Especially as this reduces turbulence around the neck area - if you're current helmet is designed to reduce neck turbulence already then the difference with the windjammer might not be so noticeable. Although I've never seen a helmet designed as flush as the result of using a windjammer so there'll probably be minor improvement with any type. On the other hand if you have a helmet that's poorly sound-proofed and has a lot of turbulence around the neck area then you'll notice a huge difference.
Secondly, and most pertinently, is that it seems to depend on riding position. I ride a Yamaha Diversion XJ600S, which is a fairly neutral riding position so I can experiment between sitting bold upright and leaning/ducking right forward.
SAT BOLT UPRIGHT THE WINDJAMMER MAKES A HUGE DIFFERENCE. In this case the bottom of the helmet with windjammer presents a near perfect parallel to the oncoming wind, which means the wind flows past smoothly and quietly. Compared to without the windjammer where the wind will circulate and eddy round all the nooks and crannies it can find across the irregular surface of the bottom of your helmet causing a lot of turbulence and noise. In this case at motorway speeds, the difference between winjammer on/off sounds like winding all the windows up in a car.
In a leant forward racing position however, the top of your helmet hits the oncoming wind, and the bottom of your helmet is now facing slightly backwards. The oncoming wind buffets around the top of your helmet (and ears!) which is quite deafening, the bottom of your helmet is in the wake, it's turbulent around here anyway but not particularly noisy so sealing it off in my experience doesn't make as much difference in this position.
So overall if you're riding a cruiser or sports-tourer where you're sat upright (or close) I guess you'll get a lot of benefit, whereas pure sports bikes (eg R6/R1, CBRR, etc) where the seating and handlebar position means you're leant far forward, will notice much less difference (see attached drawing).
A couple of final consideration. It can't do much about turbulence from wing mirrors, windshields, fairing, etc. If for example the loudest noise is caused by a badly positioned windscreen then reducing the turbulence around the bottom of your helmet isn't going to be very noticable in comparison.
And something that should go without saying - it's a "windjammer" and you don't generate much wind noise at 30mph, so it won't make much difference around town. It's more for country roads and motorway.
In summary for what it costs, no matter what you're riding etc, it might be worth trying anyway. Might be barely noticable, but it might be fantastic. I've tried to give a detailed technical breakdown as possible so you can estimate how much of an improvement you're likely to get, but practice will always beat theory so if wind noise is an issue for you then for £12.49 I'd give it a go and see.