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Old 11-07-2011, 08:36 AM   #31
TAMPAJIM OP
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I tried four different screens on my FGS before I discovered Madstad.

In my experence, the big simple "slab" screens have two problems at speed. (they work just fine under say 55 mph)

There is no provision to get any air behind the screen so a vacuum forms and then collapses creating all kinds of uncomfortable effects. You can try cutting a slot (like Calsci) in the screen but I never had much success with that.

If the screen is high enough to block the air flow from your helmet, it lets the air from under the handlebars to rush in and up your torso, creating under helmet buffeting. Short screens don't have this problem because the top flow shears off that up flow. You could design and fabricate some wingets to deflect that underflow but you still have the vacuum thing to deal with.
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Old 11-07-2011, 08:58 AM   #32
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Old 11-07-2011, 09:02 AM   #33
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Originally Posted by Mercury264 View Post
Jerry - is that the T800 specific-version of the MRA screen ? If not do you have a part number perhaps (their site lists lots of options).

Cheers
Nope, I just added the spoiler to the stock screen. I used the VTA4 and it fit quite well. You may want to measure and see if one of the other part numbers would fit better, I used this one as I had it from an earlier project.

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Old 11-07-2011, 09:08 AM   #34
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Quote:
Originally Posted by TAMPAJIM View Post
I tried four different screens on my FGS before I discovered Madstad.

In my experence, the big simple "slab" screens have two problems at speed. (they work just fine under say 55 mph)

There is no provision to get any air behind the screen so a vacuum forms and then collapses creating all kinds of uncomfortable effects. You can try cutting a slot (like Calsci) in the screen but I never had much success with that.

If the screen is high enough to block the air flow from your helmet, it lets the air from under the handlebars to rush in and up your torso, creating under helmet buffeting. Short screens don't have this problem because the top flow shears off that up flow. You could design and fabricate some wingets to deflect that underflow but you still have the vacuum thing to deal with.
Thanks for the info. This shit straight pisses me off! We can fly to moon (supposidly that is ) but companys make wind screens that are pure junk! What a crock of shit. Its not like Givi is a small name. Why cant they make a good screen??? Its not like the materials are very expensive. I guess I will have to go with the Madstad screen this spring...
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Old 11-07-2011, 09:10 AM   #35
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Originally Posted by Jblk9695 View Post
Nope, I just added the spoiler to the stock screen. I used the VTA4 and it fit quite well. You may want to measure and see if one of the other part numbers would fit better, I used this one as I had it from an earlier project.

Jerry
Thanks Jerry - that helps a lot. So this is the bolt-on version right ? I'm kinda confused why the bolt-on VarioTouring Extension Spoilers is 80 bucks at Twisted Throttle but the Add-On Variable Windscreen Spoiler Blade is 120 bucks and they look almost identical

Does anybody know the difference between the 2 products ?
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Old 11-07-2011, 09:47 AM   #36
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Originally Posted by Mercury264 View Post
Thanks Jerry - that helps a lot. So this is the bolt-on version right ? I'm kinda confused why the bolt-on VarioTouring Extension Spoilers is 80 bucks at Twisted Throttle but the Add-On Variable Windscreen Spoiler Blade is 120 bucks and they look almost identical

Does anybody know the difference between the 2 products ?
Yes, this is the bolt on version and just make sure to use a template and double check the location before drilling the holes.
I think the add-on version looks to be bigger, but not 40 dollars bigger.

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Old 11-07-2011, 11:10 AM   #37
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Originally Posted by Snapper View Post
I'll throw in my vote for the Madstad.
Thanks for the insight.. I'm interested in the Madstad screen, but notice they have four different offerings for the T800.
18"/20"
Sport/Adventure
In all combinations plus optional screen tints.

I like the way yours looks, but was curious if you remember which model/size you chose?

Thanks in advance..
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Old 11-07-2011, 11:28 AM   #38
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indeed laminar flow is not rocket science but it's amazing how all these beast adv bikes are ignoring the concept???
mark just took a simple adjustable design and fixed the problem building everything with the concept of the needed laminar flow. i now see several variations/copies of his basic design from various places in the world. i'm amazed a mfg has not come to him for design help. guess that keeps him in biz. either way it works as it's based on know air flow dynamics.

like you said calsci attempts to create with a simple naca duct but only move so much air and is really just a cut not a true naca duct. other mfg try a flip top lip with the theory that pushes air up higher but with out laminar flow, does nothing if not make it worse. finally others just make a barn door. and then there are the added laminar pieces such as laminar lip and mra vario top lip or even tourtech's extended screen lip.

mark does offer mra vario as an option to create a dual laminar flow for the problematic strom issue using a tall adv sceen and vario http://www.madstad.com/s.nl/it.A/id....&category=1289
i asked him about other shields and he said even though he has not done it it's possible to use on the 20" adv one plus his other 3 screens by matching the correct vario http://www.twistedthrottle.com/trade/productlist/339/

he said no one has gone for the added expense, but it would only help it make it quiter, if that's even possible or needed. he thought his dark grey screen would match the tinted vario best as his smoke screen was more brown than grey. he said if requested he's make it as he's the kinda guy that will pretty much make anything you request.


Quote:
Originally Posted by TAMPAJIM View Post
I tried four different screens on my FGS before I discovered Madstad.

In my experence, the big simple "slab" screens have two problems at speed. (they work just fine under say 55 mph)

There is no provision to get any air behind the screen so a vacuum forms and then collapses creating all kinds of uncomfortable effects. You can try cutting a slot (like Calsci) in the screen but I never had much success with that.

If the screen is high enough to block the air flow from your helmet, it lets the air from under the handlebars to rush in and up your torso, creating under helmet buffeting. Short screens don't have this problem because the top flow shears off that up flow. You could design and fabricate some wingets to deflect that underflow but you still have the vacuum thing to deal with.
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eakins screwed with this post 11-07-2011 at 11:34 AM
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Old 11-07-2011, 11:35 AM   #39
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Originally Posted by twflybum View Post
Thanks for the insight.. I'm interested in the Madstad screen, but notice they have four different offerings for the T800.
18"/20"
Sport/Adventure
In all combinations plus optional screen tints.

I like the way yours looks, but was curious if you remember which model/size you chose?

Thanks in advance..
that is the adv screen.
best shape for the 800 IMO. he shows what he thinks is the best shape on his site for each bike.
there all drilled correctly per the bike so you can use 2 and switch off if you like.
http://www.madstad.com/s.nl/sc.7/category.888/.f
20" i think. he has that and 22" depending on your size.
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Old 11-07-2011, 11:40 AM   #40
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Originally Posted by Mercury264 View Post
Thanks Jerry - that helps a lot. So this is the bolt-on version right ? I'm kinda confused why the bolt-on VarioTouring Extension Spoilers is 80 bucks at Twisted Throttle but the Add-On Variable Windscreen Spoiler Blade is 120 bucks and they look almost identical

Does anybody know the difference between the 2 products ?
http://www.twistedthrottle.com/trade/productlist/339/
the $80 is for fixed width designs that might work on other bikes.
the add on one is universal and pivots at the screen and base for adjust mounting widths. the pivot brackets cost more, so try and find a fixed one that works.

both fix or universal (clamp or bolt mount) designs angle up or down as well as move up or down a bit.
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Old 11-07-2011, 11:44 AM   #41
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madstad base place makes a great place to bolt a ram base ball mount too!
very nice. looks like a nuvi 500/550/220. i have a 500.
TT has a hardwire kit is you're interested:
http://www.touratech-usa.com/Store/P...able-with-Fuse

Quote:
Originally Posted by TAMPAJIM View Post



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Old 11-07-2011, 12:08 PM   #42
TAMPAJIM OP
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Quote:
Originally Posted by twflybum View Post
Thanks for the insight.. I'm interested in the Madstad screen, but notice they have four different offerings for the T800.
18"/20"
Sport/Adventure
In all combinations plus optional screen tints.

I like the way yours looks, but was curious if you remember which model/size you chose?

Thanks in advance..
I have the ADV style, 20". Mine is clear but I will probably get the light smoke because I've had it before and love it.

I am 6', 31" inseam, seat set high. Any less torso length I would recommend the 18" because you want at least a few inches of gap at the bottom of at the screen for the laminar flow to be most effective. See Snapper's photo for example
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Old 11-07-2011, 12:30 PM   #43
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Yeah I was considering doing that for the GPS and radar detector, but now think the extra weight, possibly bouncing along on rough roads and levered pretty far from the mounting points, might not be such a good thing. After all, there are only three points and they are ultimately bedded in plastic.

It's pretty solid. That nose brace on the bike is substantial ( seems I remember it being metal) and the RAM base is only an inch or two away. Some guys on the Brit forum were mounting directly on that brace using a long RAM arm.

Most of my miles are on pavement and the GPS is very convenient above the instruments, but you have a good point about off road. I do keep another RAM mount on the handlebar for that purpose.
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Old 11-07-2011, 12:38 PM   #44
TAMPAJIM OP
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Originally Posted by eakins View Post
madstad base place makes a great place to bolt a ram base ball mount too!
very nice. looks like a nuvi 500/550/220. i have a 500.
TT has a hardwire kit is you're interested:
http://www.touratech-usa.com/Store/P...able-with-Fuse

Good eye, it's a Nuvi 500. I've had it ever since they came out and it's just what I need (not being a power user).
Don't leave it on the bike full time, only trips or if I need to find something. Use a little 18" special purpose cord from Powerlet to hook it up. Even have a little fabric hood for it I got from a marine supply.
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Old 11-07-2011, 12:43 PM   #45
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Originally Posted by TAMPAJIM View Post
Good eye, it's a Nuvi 500. I've had it ever since they came out and it's just what I need (not being a power user).
Don't leave it on the bike full time, only trips or if I need to find something. Use a little 18" special purpose cord from Powerlet to hook it up. Even have a little fabric hood for it I got from a marine supply.
yep nice simple water-proof nuvi.
that fabric hood help w/ glare?
got a link?
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