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Started by Guest_nils_* , Aug 20 2006 09:45 pm

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#21 Pict

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Posted 23 August 2006 - 10:48 am

QUOTE(wicklamulla @ Wed 23rd Aug 2006, 11:15 AM) <{POST_SNAPBACK}>
aye well my tall screen was a freebie from AlunL and has a hole and a crack in it already !! so im not too concerned about messing it up, i will ponder the theory over the next few days....

Well done W for being our "test pilot" good.gif Will you be copying that (Honda?) thing to some extent i.e. keeping the holes low down and symmetrical? I've a nasty feeling shape will be important, too, not just size and position, so maybe that "elephant's nostril" pattern in the picture is the way to go in the end? Good luck. smile.gif

Edited by Pict, 23 August 2006 - 10:49 am.

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#22 brihol

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Posted 23 August 2006 - 11:01 am

QUOTE(wicklamulla @ Wed 23rd Aug 2006, 11:15 AM) <{POST_SNAPBACK}>
aye well my tall screen was a freebie from AlunL and has a hole and a crack in it already !! so im not too concerned about messing it up, i will ponder the theory over the next few days....


Hi, I wasn't trying to discourage experimentation to produce a better screen that would benefit us all, just trying to avoid a screen cracking/snapping/dislodging at a vital moment, leading to who knows what. Be careful!!(Sorry it's my old fogie guise again) Please understand I was not proposing myself as one of the experts. It's just I have worked with different materials as a Technology teacher (retired) and stresses and shapes are very intimately linked (you won't remember the Comet jet aircraft but it's crashes prove my point)

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Edited by brihol, 23 August 2006 - 11:12 am.

#23 wicklamulla

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Posted 23 August 2006 - 11:12 am

QUOTE(brihol @ Wed 23rd Aug 2006, 11:46 AM) <{POST_SNAPBACK}>
Hi, I wasn't trying to discourage experimentation to produce a better screen that would benefit us all, just trying to avoid a screen cracking/snapping/dislodging at a vital moment, leading to who knows what. Be careful!!(Sorry it's my old fogie guise again)

Brian


rotflmmfao.gif ok daddy !! good.gif oil have to folly yer instructions on cutting etc etc, Pict i saw/have a pic of a MKII screen with a hole already cut in it (probably done from new by the factory though) so i was thinking of trying to replicate their efforts.

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#24 ROB1

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Posted 23 August 2006 - 01:07 pm

QUOTE(wicklamulla @ Wed 23rd Aug 2006, 01:57 PM) <{POST_SNAPBACK}>
rotflmmfao.gif ok daddy !! good.gif oil have to folly yer instructions on cutting etc etc, Pict i saw/have a pic of a MKII screen with a hole already cut in it (probably done from new by the factory though) so i was thinking of trying to replicate their efforts.

what about copying the mk1 style.use daplebs screen as a template to get a factory shape hole.

#25 dapleb

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Posted 23 August 2006 - 02:52 pm

I have a spare mkII screen (somewhere) that I would let go for a very reasonable price for experimentation.

As Rob says, the mki already has a letterbox in it, and as I mentioned in one of the other threads, I can't notice any difference.

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#26 dandywarhol

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Posted 23 August 2006 - 05:18 pm

QUOTE(dapleb @ Wed 23rd Aug 2006, 03:37 PM) <{POST_SNAPBACK}>
I have a spare mkII screen (somewhere) that I would let go for a very reasonable price for experimentation.

As Rob says, the mki already has a letterbox in it, and as I mentioned in one of the other threads, I can't notice any difference.

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#27 Mitch

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Posted 25 August 2006 - 06:50 am

Wicky pondering theory? blink.gif .............mmmmm, don't work for me I'm afraid tongue.gif

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#28 duibhce Kaelann

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Posted 25 August 2006 - 07:15 am

This is a mod of a screen on a diversion 900. Big air vent holes at the bottom and slightly decapitated...



The rider's comments: The holes do help against buffeting, but only at high speeds. That's why after a while he started taking parts of the top cm by cm until the turbulence didn't hit him in the head anymore...

Edited by duibhce Kaelann, 25 August 2006 - 07:16 am.

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#29 Pict

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Posted 25 August 2006 - 04:25 pm

QUOTE(duibhce Kaelann @ Fri 25th Aug 2006, 08:00 AM) <{POST_SNAPBACK}>
This is a mod of a screen on a diversion 900. Big air vent holes at the bottom and slightly decapitated...



The rider's comments: The holes do help against buffeting, but only at high speeds. That's why after a while he started taking parts of the top cm by cm until the turbulence didn't hit him in the head anymore...


Interesting - looks like Ann Widdecombe on a manhunt? hidden.gif sad.gif blink.gif

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#30 dandywarhol

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Posted 25 August 2006 - 05:46 pm

You worry me at times Pict...................... huh.gif

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#31 Pict

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Posted 25 August 2006 - 06:09 pm

QUOTE(dandywarhol @ Fri 25th Aug 2006, 06:31 PM) <{POST_SNAPBACK}>
You worry me at times Pict...................... huh.gif

Why - hmm?? blink.gif tongue.gif
Just cross-referencing threads, not expressing preferences! jester2.gif

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#32 Tempest

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Posted 25 August 2006 - 07:09 pm

Rather than mess up REAL screens, why not just use some very stiff card, or some perspex sheet or something.

Cut lots of holes, tape other ones up and see what the best is, THEN cut a real screen?

Must admit, I'm not a fan (Visually) of plain round holes.

Some slot/angled opening would be more in keeping with the style of the bike/screen.

I know it's hard, as I say, perhaps something where you can add and remove bits (with the help of tape) may be more useful.
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#33 Lerk

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Posted 25 August 2006 - 07:31 pm

I'm thinking it might pay to try cutting down the screen before attempting to create a/some neat looking holes in the screen...

It would be easier to get a good finish on the top edge, and you can cover the edge with some of this

Just my £0.02 worth!

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#34 AJ_Blizzard

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Posted 30 September 2006 - 09:34 am

Any MRA Vario Touring Windshield experiences amongst TDM 900 carpedians...?
Here's mine...

I'm 6,03 ft (184 cm.) tall (tall body, short legs… inseam approx. 34 inches) and experienced a lot of wind noise, turbulence and buffeting on my new TDM 900. A lot more than on the Suzuki 1100 GSX EF 1985 mod. I once owned back in 1991.

The TDM was delivered with the tall lipshaped stock Yamaha screen. And after a few rides I suspected this screen to be the noisemaking culprit.
So I decided to try another screen, read a lot of positive feedbacks from users on several discussion forums on MRA Vario Touring Windshield and ordered one from a retailer here in Norway.
I got it a couple of days later, put it on (done in less than 10 minutes) and took the bike out for a ride to try different settings. Didn't notice too much difference that evening, but the next few days I rode a few miles more and now I can say for sure that this screen makes a big difference!
The adjustable spoiler really works. I doesn't remove the wind, but it takes better control over it than what the lipshaped stock screen does.
The noise, turbulence and buffeting is gone and the bike seems a more steady at all speeds.

The best settings for me seems so far to be the third position from the top and the top setting, depending on if I want the air directed to my chest or the top of my helmet. There's no big difference in wind noise on these settings.

Are there other Carpedian experiences out there with the Vario screen? And have any of you tried the MRA Touring screen, the tall one that's not equipped with the adjustable top spoiler?
I am thinking about trying that one too if other TDM riders have good and convincing experiences with it…

Edited by AJ_Blizzard, 30 September 2006 - 09:35 am.

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#35 tdm850rider

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Posted 30 September 2006 - 01:40 pm

QUOTE(brihol @ Wed 23rd Aug 2006, 06:08 AM) <{POST_SNAPBACK}>
One of the reasons I fitted an aftermarket screen on my 850 was that I wanted to sit fairly upright on the bike (back to discussions of "old-folks bike"). It's only 40mm taller and seems to have cured the problem of my shoulders being slightly buffeted, but it has increased the wind noise in my helmet (admittedly bought for price, rather than comfort), forcing me to wear earplugs for any but the shortest journies.

Obviously carving random holes in an expensive screen is not something anyone will undertake lightly without guidance from experts. I would think there should be no sharp transitions in any holes ie everyting in the shape should be smooth curves. Although slow I would also think the best plan for cutting would be to drill a hole through the screen at a suitable point and to hand cut it with say a 4mm abrafile - yes it will take a long time but you will be totally in control. I would also recommend spending quite a while smoothing, rounding and polishing any cut edges.

Brian


This may work for some:

In the US TDM's didn't come with 'city lights' (the small light in the upper fairing/fearing.)
If it is not there or not legally needed you could try removing it and seeing if it works as a balancer intake for the difference in air pressure behind the screen. If it does place a metal grill behind the hole painted a nice contrasting colour/color. cool.gif

If it doesn't work you just pop the light or filler plate back in.... nothing lost.
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#36 Guest_E.T._*

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Posted 01 October 2006 - 04:21 pm

I have the MRA Vario screen on mine, and it makes a a big difference to buffetting and very little to weather protection.

The reason is the same as MW, Dauvilles FJR's (IThink) that allow air up the inside of the windscreen. aerodynamically whats happening is you get two different speeds of air. A higher velocity air up the outside of the screen, a lower velocity (because of the reduced volume of the air - the hole can only let so much in). This means the faster moving air is meeting with slower moving air, which is faster than the stationery air (had the slots not been there), which in turn meets with the stationery air.

The effect of this is less turbulence and less noise. This same principle is used in modern passenger jet aircraft to reduce noise (caused by fast moving air hitting slower moving air) by introducing an intermediate velocity air. If you look at teh engine in profile, not only does it have the main outlet nozzle it also has a second outlet all the way around the outside of this, hence the stepped appearance of a jet engine.

Tis better to look at a diagram reallythan to describe in words ..but I hop that gives the gist of it?

#37 Pict

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Posted 01 October 2006 - 05:51 pm

QUOTE(Tempest @ Fri 25th Aug 2006, 07:54 PM) <{POST_SNAPBACK}>
Rather than mess up REAL screens, why not just use some very stiff card, or some perspex sheet or something.

Cut lots of holes, tape other ones up and see what the best is, THEN cut a real screen?

Must admit, I'm not a fan (Visually) of plain round holes.

Some slot/angled opening would be more in keeping with the style of the bike/screen.

I know it's hard, as I say, perhaps something where you can add and remove bits (with the help of tape) may be more useful.


A recent acquaintance (come in, Mike!) has been experimenting with cardboard screens of various shapes and sizes on his 900 - have asked him to share the results here.

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#38 Braghini

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Posted 07 October 2007 - 02:10 pm

Hi. Now that I've ridded a few more km I felt the (bad) air influence on the helmet using the original shield. I've been thinking on change it but, the more I read about the more I got confused. I'm 1.82 m tall and the most important thing to me when riding is the overall confort as I don't push too much the speed. Please, did you get more information about all different possibilities that you mentioned? Would you give some practical direction?Thanks a lot.

#39 robelst

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Posted 07 October 2007 - 02:28 pm

QUOTE(Braghini @ Sun 7th Oct 2007, 02:55 PM) <{POST_SNAPBACK}>
Would you give some practical direction?Thanks a lot.

It's confusing because it's very personal; some are only satisfied with a screen behind which they can smoke a pipe and read a paper while others prefer a bit of a breeze and/or require strict silence around their heads regardless of wind-pressure. And even if your preference has been achieved by someone on one bike, it may not work at all on yours because of slight difference in body height and/or helmet.

I am 6"5 (that'll be around 1.95 m) and the standard 850 screen / BMW System V helmet works a dream for me (reminds me of the equally small but excellent BMW K100RS fairing), but if I duck a bit I can clearly hear more noise and feel turbulence developing so I'd imagine others would want a different solution.

I am afraid it doesn't get much more practical than this laugh.gif

Ideally you'd meet up with some people and try whatever they have fitted on their bikes.
Purely by coincidence there happen to be quite a few TDM owners on this forum, so maybe we should have a yearly "try-my-windscreen" day good.gif
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#40 Sparky

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Posted 07 October 2007 - 06:27 pm

QUOTE(robelst @ Sun 7th Oct 2007, 03:13 PM) <{POST_SNAPBACK}>
Ideally you'd meet up with some people and try whatever they have fitted on their bikes.
Purely by coincidence there happen to be quite a few TDM owners on this forum, so maybe we should have a yearly "try-my-windscreen" day good.gif


Sounds good to me. I'm itching to try one of those MRA screens, because the noise from my tall Yam screen is quite irritating. I'd quite happily fork out £90 to sort this out, but it's a lot to spend without knowing for sure what the effects will be. unsure.gif
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