169 replies to this topic

[TimH]

Ahh, German engineering....

http://www.mv-motorr...owrub--003,.htm

I think you would need to wear the matching helmet for full effect though...

http://www.partyanim...opellor Hat.jpg

[AzzA]

Ahh, German engineering....

http://www.mv-motorr...owrub--003,.htm

I think you would need to wear the matching helmet for full effect though...

http://www.partyanim...opellor Hat.jpg

Finally!!! Something to take the massive impact out of those huge bugs, bees, and blowflies... a front mounted vitamiser. (Probably good for small birds and fingers too.)

[MCBodge]

Isn't that more Danish, like this classic?

[TDM2340]

[quote name='Gabby' date='Sun 11th Oct 2009, 06:39 PM' post='137634']
Been reading this long post for some time and have finally got around to experimenting and making a version of a dual layer screen that works for me so will share my findings. I didn't want to cut down the standard screen because I like having my neck out of the wind on this bike. I didn't however want anything too high that would flap around and that I would have to look through.
I found the standard screen produced an almost knife-edge sharp line across the bottom of my visor where the wind hit it if I held my hand up; a very distinct change in a small distance that was very noisy. The modified screen leaves the bottom of my visor in the clear and I have a more gradual change in things over a greater distance. The very distinct change has gone and it's quieter. It's basically diffused the air stream coming off the screen.

I moulded some acrylic into the shape of the standard screen but made it more vertical than the existing top half. It extends vertically about 50mm higher than the existing. It is spaced off by 6mm bar using longer screws. This results in the bottom of the added screen being clear by about 6mm at the bottom and 30mm at the top.
[i]The holes are an addition today which seem to diffuse the air stream even more so another row higher is the next thing to try.[/i]


Hey Gabby,

Wondering if you've done the second row of holes yet and any changes ? What about a line of holes in the internal screen as well ?

I have put the standard screen back on and will try to mount the extended YMF screen on top in the same fashion you have done.

Thanks for the efforts !!

[gabby]

No, TDM2340, I must confess I have been time-challenged and not done it. However I'm taking this screen on a 1,500 km trip next week so will have a better idea then if it's a real improvement and worth pursuing. I'm still convinced that unless you want it either very low or very high, there is still going to be helmet wind noise with an average size rider, so it's never going to be completely calm in the cockpit. Life on a bike is always going to be about compromises, and if it's not you are probably on something horrible and may as well drive a car.

[Geordie Guy]

Thats very profound, Gabby.

I'm starting to think there's no one perfect answer.

Just your own .......

[Buddner]

Any pictures to show us what it looks like. I got the MSA screen flip up thingy and used a bigger section of old screen i had in place of the MRA flip up bit plus i drilled the botton of the bike screen but i still get hammered with the wind, i have ordered a Wind jammer of EBay for the bottom of my helmet to see if it will quiten down the bloody wind noise, (should get it soon)i drive from Drogheda to Leixlip in Dublin alot and by the time i arrive my ears are ringing and thats with ear plus.....
[/quote]

Edited by Buddner, 23 October 2009 - 09:31 pm.

[TimH]

Hmmmmm.....

Went for a 600km ride last weekend, open country roads, windy on the way there but weather was great on the way home on Sunday....

I had previously cut my screen down about 5cm as per Baron's suggestion http://www.carpe-tdm...o...ost&p=20358, and it reduced the buffeting and noise, and IMHO looks better than the stock screen.



but on the way home the noise was getting to me, so I stopped and removed the screen. I'd previously test ridden without a screen so I knew it was a solution. The next 200k's home were great, quiet enough to hear the music from my Sennheiser noise isolating earphones, which normally aren't isolating enough. Wind pressure was a bit tiring though, and of course it looked a bit strange.

NB I have a Windjammer on my helmet too Buddner, it works really well, except it tries to rip my ears off when I put the helmet on. A bit of minor modification with scissors (windjammer, not my ears) helped, but wearing a silk balaclava is the only way to make it easy to put on. Worth the effort though IMO.

Anyway, during the week I got the jigsaw out and followed Graeme's cut down system. Did it in stages, test riding each time (ATGATT was a pain!), started flat, then 2cm deep rebate, then 4, then 6.... pretty much eliminates buffeting, but I'm still getting a lot of noise. It's now at 10cm, I have wind pressure on my upper chest which is fine, chin seems in clean air, but there is STILL a lot of noise (that goes away if I raise my backside about 5cm off the seat, getting my head in clean air). I'm surprised as I'm 5'11" same as Graeme, maybe I have a short torso, FIIK. It appears to be coming from the raised parts of the fairing that hold the edge of the screen.

I'm not sure I'll ever get rid of this noise. I don't have another screen, and IMO the now severely cut down screen looks crap (I actually liked the lesser cut, as per Graeme's bike). So I'm now in need of a new screen, and back to square one. I'm going to have a go at making one (inspired by Gabby's work), I reckon I can get a sheet of acrylic for much less than a new screen, which will let me try a few different shapes and sizes.

I'll admit I was getting a little (lot) frustrated by all this, until I reminded myself that part of the fun of having a bike is stuffing around with it....

BTW - My forks are dropped 15mm through the triple clamps, it was like that when I bought it, and I really like the way the bike handles now I have the rest of the suspension set up right, so I don't want to change it, but I was wondering if this could have any bearing on the problem, by lowering the front of the bike slightly??? If I get time this weekend I might set it back to stock and see what happens.

Edited by cypher, 23 October 2009 - 10:00 pm.

[Studley Ramrod]

I'd agree with you GG there's simply too many varying factors.

It's a good topic, and I've been watching it progress with interest. I think I'm gonna have 2 screens and work on being able to swap em over quickly and possibly a storage place to stash the spare. The mk1 just looks so much better with a short screen, any touring or tall screen makes it look a tad naff. Might be the angle of the screen that goofs it up.

Hats off to all the contributors, 7 pages of research !

[MCBodge]

I've not been overly successful in my quest to reduce buffeting and noise either.
I have improved the situation, but there are still issues, especially at higher speeds.

I can know hear the engine at higher speed than previously and sitting at 60mph(~100kph) is more pleasant. Cutting the screen lower results in more pressure on the chest/neck which is not comfortable.

A good solution would probably require a screen with variable pitch and height that could be altered on the move to suit the conditions.

[Geordie Guy]

What have I done ........





Seemed a good Idea at the time.

Gods knows what it will be like ?

[Geordie Guy]

LD, I think I had too much cake, when I did that....

Think I will call it the " Ned Kelly Screen "

[TimH]

Hi Cypher, sorry you have not had a totally successful time of it. I have been really happy with the 60mm(or so) below straight across shape. Even when you are in clear, and it sounds like you are, there is going to be some wind noise from the helmet and that varies with what you have round the neck. I'm not being patronising here, am sure you know all this, but just trying to be clear (no pun). But what i have also noticed is that if i lean forward there is a real noise increase (closer to screen) whereas if i lean back a bit it gets even quieter (but not comfy). I tend to sit up straight but you may not, and this may have something to do with the forks being dropped. Hey, pm me , i have the cut down double bubble (its a cheapy but ok) doing nothing and would be happy to send it to you. And dont forget that some helmets are noisy too.
cheers Graeme

Yeah, quite disappointed, given yours and others experiences have been so positive. Just shows each rider/bike is a bit different as others have recently said. The problem is I rode without a screen so I now know how quiet it could be if I can get my helmet in clear air. It's a lot quieter now than with the stock screen, just not was I was hoping for. If I map the wind line with my hand while riding along (must look interesting to anyone watching!) the front of my helmet is clear, but there are two streams of wind which still hit the sides of my helmet below my ears, which is where all the noise is now coming from.

The noise is definitely coming from the fairing/screen - if I stand up the noise goes away (still some helmet noise of course but it's only about 5% of the noise from the screen). If I lean back it is quieter, but I have to seriously lean back. I find I spend a fair bit of time with the balls of my feet on the pegs and my heels on the heel rest(?) behind the pegs, I just find this comfortable. So maybe I tend to lean forwards a bit, which could be a result of the lowered forks.

Since it is quiet with no screen, I assume if I trim the screen sides back flush with the fairing the noise will go away, but that is going to look terrible.

I'm about to put the forks back to standard, go for a ride and see what happens.....

You'd think yamaha would just get it right in the first place. I'm sure they have wind tunnels.

You would think so. They've been making them unchanged for 8 years. You would think in that time at least one Yamaha designer would have had a look at this forum, or maybe even asked a few TDM riders of their opinions of the bike (gosh, maybe even ridden one!). Their web site spews on about how TDM riders are a dedicated bunch etc etc.... maybe because we know what a good bike it is we will just accept the few shortcomings, so they don't need to spend any money on fixing them. Or maybe if they fix them, they are worried no-one will by any of their other bikes cos the TDM will be perfect

[Geordie Guy]

Been out for a ride today, it was bloody windy, 30-40mph.

Thought I was going to bin the new experiment immediately.

I have to say the Ned Kelly screen does make a difference.

Its hard to say but the wind feels softer even when I was doing 65mph straight into the wind.

With my hand in front feeling where the wind is, normally there is a dead zone and you can feel where the blast is.

This time there is no line, its just seemless, the difference is wierd, quieter, like I said softer.

I did study those wind tunnel pictures and then sat the other night, drawing diagrams of fluid dynamics, which gave me the idea of opening it up.

Anyway I like it and its staying for a longer trial. might even patent it.



Ivan

[TDM2340]

G'day all,

After following this thread for a while, and waiting for my ears to recover from 3,000+ klms round trip to Phillip Island for the MotoGP, I thought I'd have a play as well. I had a standard screen, over which I placed the longer YMF touring screen. The theories worked on by others sounded good, and I looked at plenty of other info and photos on the net as well. While I'm no craftsman, I think it looks pretty good.

First test ride was on a windy day and the result seemed OK but I held judgement until today. There is no doubt whatsoever it is better - much better, but still not perfect. The wind noise is definately reduced quite a lot, but the buffeting still occurs but only on the sides of the helmet and shoulders. It feels like the handguards and mirrors contribute to this, so what do you do about that ? The reduction in all things annoying directly at and under the helmet was certainly worth the effort. I've considered eating too much cake and drilling some holes in one or both of the screens, but would hate to bugger up the look for no real result. Think I'll sit on my hands for a while and give it some true testruns before I get excited with the drill.

One thing remains the same though, any day riding is a day well spent !!!

The photos aren't great - taken on a mobile, but you get the idea. Any feedback and suggestions would be appreciated.