Helmets

[B7ACKTHORN]

Re: Helmets

hmmm so these ear plugs can be found in helmet shops?

for all the tweeple out there, you can follow me by my twitter handle @murlidhar

I mean, you can check drug stores, they have ear plugs are prescribed decibel induced trauma, and I got it from a drug store here in Ooty, my hometown. If I can get it here, you can definitely get it in drug stores.

I still doubt helmets shop stack them, as I don't know how much even know there is a thing called ear plugs.

Your best bet would be drug stores, if no, then eBay.

Cheers!
VJ

[niteshneela]

Re: Helmets

ordered
Spartan Pro Gear

yellow color .. 5075 including shipping to hyd

they told me they vl ship on monday

[sidhusmart]

Re: Helmets

I managed to complete the sticker work on my helmet so I thought I'll introduce it. Bought a SOL 68SII last week from A H Helmets. I had some design ideas in mind that I posted earlier. Thanks to those who replied!

And this is how it finally looks


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Mr. Hemant was really pleasant and knew well about xbhp as well. The contact number posted somewhere on this forum turned out to be incorrect but I was able to contact him through a different number. He rues switching his mobile number though because apparently he's lost a lot of business! Anyways, here's his current contact details for those of you in Mumbai -

(M) - 9769902249
(O) - 61426660

[princesirohi]

Re: Helmets

we should be able to measure the wind noise with a decibel meter. i have it in my office, will try and report back.

[Sunnyside_up!]

Re: Helmets

we should be able to measure the wind noise with a decibel meter. i have it in my office, will try and report back.

The main reason that reviewers don't use one is that noise is dependent on many different factors. The kind of bike - whether faired or naked, the riding position - whether upright or crouched, the speed of the bike, the wind direction at that time, the wind speed, the location of the test, the time of day, the temperature, ambient noise, etc., How will you control all these factors to measure the decibels accurately?

[princesirohi]

Re: Helmets

The main reason that reviewers don't use one is that noise is dependent on many different factors. The kind of bike - whether faired or naked, the riding position - whether upright or crouched, the speed of the bike, the wind direction at that time, the wind speed, the location of the test, the time of day, the temperature, ambient noise, etc., How will you control all these factors to measure the decibels accurately?

well, it will give a fairly good idea, even if not very accurate, and if you are comparing two helmets, then testing them on the same patch of road, on the same bike with same rider will give a good comparison results.for accurate results, you need to do wind tunnel testing then. it will give 100% accurate results.IIT Powai (Mumbai) has wind tunnel testing facilities.

[B7ACKTHORN]

Re: Helmets

well, it will give a fairly good idea, even if not very accurate, and if you are comparing two helmets, then testing them on the same patch of road, on the same bike with same rider will give a good comparison results.for accurate results, you need to do wind tunnel testing then. it will give 100% accurate results.IIT Powai (Mumbai) has wind tunnel testing facilities.

I am sorry but I had quite a hearty crack on that one. How can you just measure the wind noise based on the helmets. Do you know, that expensive helmets too do have noise associated with them. And most of them confuse one basic thing, CROUCHING. A same ARAI race spec helmet can whistle crazy when you ride with an upright position than a crouching position.

It's not just wind noise measurement with a decibel, but how the helmets carries the wind in, throughout and exhausts it.


Cheers!
VJ

[princesirohi]

Re: Helmets

Reagarding how to measure- place the helmet in a wind tunnel with decibel meter inside the helmet.

Regarding expensive helmets also having wind noise-- yes they may also have noise. But i never said that costly helmet do not have wind noise. Its just a matter of measuring up the noise and finding out which one is more silent.

Crouching does affect wind flow. But a helmet which produces less noise in upright seating position will obviosly produce lesser noise in crouched position.

I am just suggesting that wind noise can be and should be measured. There is no harm in it and it is noy something impossible.

And u can also measure with vents open and vents closed.

I rather find it amusing that ppl do not want to measure wind noise generated by helmets or think that it is something impossible or not doable.

Sent from my GT-S5570 using Tapatalk 2

[Sunnyside_up!]

Re: Helmets

well, it will give a fairly good idea, even if not very accurate, and if you are comparing two helmets, then testing them on the same patch of road, on the same bike with same rider will give a good comparison results.for accurate results, you need to do wind tunnel testing then. it will give 100% accurate results.IIT Powai (Mumbai) has wind tunnel testing facilities.

Same bike, same rider, ok. How will you account for wind speed and direction between the two tests, seated angle of the rider, the position of his shoulders and arms, ambient noise, just to name a few? Wind tunnel testing is done to test aerodynamics of helmets - even bicycle and ski helmets go through this in the design phase, but beyond a point noise is totally subjective. Even fit of a helmet, the tightness of the padding, the chin curtain, the seal of the visor, the neck roll, etc., all cause variations in noise levels. A new tight fitting helmet will seal against wind noise better than an older one.

And after you find some way to negate all the variables or equalise them, you're going to use the wind tunnel at IIT Powai to get results?

I await with bated breath.

[B7ACKTHORN]

Re: Helmets

Reagarding how to measure- place the helmet in a wind tunnel with decibel meter inside the helmet.

Regarding expensive helmets also having wind noise-- yes they may also have noise. But i never said that costly helmet do not have wind noise. Its just a matter of measuring up the noise and finding out which one is more silent.

Crouching does affect wind flow. But a helmet which produces less noise in upright seating position will obviosly produce lesser noise in crouched position.

I am just suggesting that wind noise can be and should be measured. There is no harm in it and it is noy something impossible.

And u can also measure with vents open and vents closed.

I rather find it amusing that ppl do not want to measure wind noise generated by helmets or think that it is something impossible or not doable.

Sent from my GT-S5570 using Tapatalk 2

When you're free, try AGVs website, they have comprehensive analysis on how it's done, and even how Rossi's helmet is made ground up, just so you get an idea as to how it's done.

The fact you've said is repeated almost n number of times, but do check out the above when time permits so u really understand how things work.

You still have Sunny's question left unanswered

Cheers!
VJ

Sent from my LT26ii using Tapatalk 2

[princesirohi]

Re: Helmets

Interesting topic of discussion, my replies in bold....

Same bike, same rider, ok. How will you account for wind speed and direction between the two tests, seated angle of the rider, the position of his shoulders and arms, ambient noise, just to name a few?

well, you must be aware of different magzines do the 0-60 & 0-100 acceleration tests of bikes as a comparison of performance, how do you think they account for wind speed and direction etc...

the point is --- although it won't give 100% accurate results, we can get fairly reliable results to give us an idea of relative performce. that same is the case of wind noise measurement on road, it will give us a comparative and relative idea that which helmet produces more noise and which one is comparitively silent.

Wind tunnel testing is done to test aerodynamics of helmets - even bicycle and ski helmets go through this in the design phase, but beyond a point noise is totally subjective. Even fit of a helmet, the tightness of the padding, the chin curtain, the seal of the visor, the neck roll, etc., all cause variations in noise levels. A new tight fitting helmet will seal against wind noise better than an older one.

if the tests are carried out on road, the answer is already above..

And after you find some way to negate all the variables or equalise them, you're going to use the wind tunnel at IIT Powai to get results?

well.. when performed in a lab, there will be no variables at all.

I await with bated breath.

no use awaiting ... coz i am not going to IIT to test helemts of all the major brands, at best i can test my helmet and that too on road. i was just saying -- what should be done ...ideally...who knows some day some one with resources will actually perform such a test to compare all the major manufacturers..

When you're free, try AGVs website, they have comprehensive analysis on how it's done, and even how Rossi's helmet is made ground up, just so you get an idea as to how it's done.


i think you are talking about this one--->>

AGV STANDARDS



The fact you've said is repeated almost n number of times, but do check out the above when time permits so u really understand how things work.

i do not understand what you are trying to convey, the link shows that agv is already doing wind tunnel testing for wind noise. and i was also saying the same thing that wind tunnel testing of helmets should be done for wind noise.

you only were against the idea earlier, so are you supporting me now or what...??

You still have Sunny's question left unanswered

which question...??

Cheers!
VJ

Sent from my LT26ii using Tapatalk 2

[becham_79]

Re: Helmets

Almost all helmets have wind noise and they get worse if you open up vents. It is inevitable at high speeds. A good fitting helmet would reduce but cant eliminate wind noise.

Most wind noise issues are caused by wind kicking in from the neck opening. While Chin curtains help, I have heard that products like this 'ugly' windjammer helps: Amazon.com: Proline Windjammer 2 "Reduces Wind Noise" Fits All Full Face Helmets. The Original Often Copied !: Health & Personal Care

But the most economic solution, if you ask me, would be to use ear plugs. It is recommended to use ear plugs at higher speeds as wind noises can cause hearing loss over time. If you close up all vents and block air from the neck, this would end up fogging your helmet, unless you have a really good anti-fog visor.

Shreiking and howling noises are often noticeable when vents are open and depenfs on the way air gets channeled inside the helmets. They also happen if the visor doesnt close tightly. They seem to exist in all range of helmets, while some are better than the other, not necessarily based on the cost/brand of the helmet. Ear plugs can bring them down to a manageable level. I think you could also find different spec (decibel) ear plugs.

[madhukarah]

Re: Helmets

What is the price of sparx helmet??

I bought Sparx S07 Bruce Lee limited edition for 4k last year from Karol Bag, Delhi... Normally the price will be 6k-8k ..

[B7ACKTHORN]

Re: Helmets

HELMET CLEANING INSTRUCTIONS
=======================

For all those who are asking the ageold question of how do I clean a helmet with removable liner, costly helmet etc here is the deal. The washing is done on a Shoei helmet with 10 steps. Click on the next in the page to proceed forward.

P.S. Though the guy uses chemicals to clean the stuff, it's to help people get an idea as to how it's done.

http://www.instructables.com/id/How-To-Clean-your-motorcycle-helmet/step1/null/

Cheers!
VJ

[niteshneela]

Re: Helmets



yay lemon yellow :S