Windshield effect on motorcycle MPG? - Page 2 - Fuelly Forums

Android Users - Coming Soon! - Migrating from aCar 4.8 to 5.0

Reply
 
Thread Tools Display Modes
 
Old 08-11-2007, 04:47 AM   #11
Registered Member
 
Join Date: Mar 2007
Posts: 1,138
Country: United States
if you want to try to find real data, then you might want to see if any motorcycle mags have top speed data with and without windshields. that would give you tha answer you want on aero drag, and from there you could work your way into a FE answer.
__________________

__________________
Bill in Houston is offline   Reply With Quote
Old 08-12-2007, 09:47 AM   #12
Registered Member
 
GasSavers_bobski's Avatar
 
Join Date: May 2007
Posts: 463
Country: United States
Quote:
Originally Posted by Erdrick View Post
You are committed to the size of the opening where the glass is supposed to be mounted. Thicker or thinner glass just makes your car heavier or lighter, respectively.
Quote:
Originally Posted by Coyote X View Post
I guess sticking Motorcycle in the title might have made it clearer
It is in the "Motorcycles" forum.
__________________

GasSavers_bobski is offline   Reply With Quote
Old 08-12-2007, 09:12 PM   #13
Registered Member
 
GasSavers_Ryland's Avatar
 
Join Date: Mar 2006
Posts: 1,325
Country: United States
Send a message via AIM to GasSavers_Ryland
with a windsheild I would think that the traditional ones would be bad because they push the air out, and at that point they end, for racing the wind screen pulls back almost more then it goes up, because if you don't have a way to smooth the air flow out, it will act like you have more frontal area, look at the photo of the vetter full faring motorcycle, notice the bit behind the driver? I suspect that is going to do more good then the whole frontal faring.
GasSavers_Ryland is offline   Reply With Quote
Old 08-13-2007, 10:24 AM   #14
Registered Member
 
Join Date: Apr 2006
Posts: 49
Country: United States
I think that Vetter's sight is worth looking at--470mpg Honda 125
http://www.craigvetter.com/pages/470...37;20Main.html
WisJim is offline   Reply With Quote
Old 01-05-2008, 12:27 PM   #15
Registered Member
 
Join Date: Dec 2007
Posts: 28
Country: United States
In the case of a sportbike, moving to a "double bubble" style screen is an improvement.

The windscreens were made, ostensibly, to smooth flow over a racer crouched down, chin-on-tank. Street rider fan-boys like myself buy them to make standard, upright riding a little more bearable, because it reduces upper body stress.

The double bubble doesn't increase frontal area considering the rider, and it sends air up and over most of the riders body-- I think the gains would be similar in effect to that of an airdam keeping air off of the car's chunky underbody.

There was an article in sport rider a few years ago supporting them, but the focus was top speed, and I'm sure the rider was in full crouch.
edenstrang is offline   Reply With Quote
Old 01-05-2008, 05:40 PM   #16
QDM
Registered Member
 
Join Date: Aug 2006
Posts: 128
Country: United States
Here is a picture of a windshield I made myself for a trip to Alaska on my Vespa in 1978. I wasn't checking mileage back then but I assume it had a positive effect since it increased my top speed. The rear storage box I built was also aerodynamically shaped.

QDM is offline   Reply With Quote
Old 01-05-2008, 06:53 PM   #17
Senior Member
 
101mpg's Avatar
 
Join Date: Dec 2007
Posts: 736
Country: United States
Was that pic of the Vespa colorized? LOL Seriously though - lots of pics of my childhood look that way too. I was 10 in 1978.

Did you actually do the Alcan highway or ferry up? How far was that trip? Ought to be a fun thread in its own right.
__________________
Looking to trade for an early 1988 Honda CRX HF (Pillar mounted seat belts)
101mpg is offline   Reply With Quote
Old 01-06-2008, 06:16 AM   #18
Registered Member
 
battleax's Avatar
 
Join Date: Apr 2007
Posts: 13
Country: United States
Windshield Mileage

Will a windshield effect mileage? In my opinion, yes, one way or another. If you have a large flat shield, you will pay at the pump, opposed to a naked bike. For instance a friend of mine, that I tour with, has an extra large tall windshield on his Gold Wing, he gets a lot less MPG than I do, and much less than his bike with a normal shield. The issue is the low air pressure area behind the windshield and just trying to push that big of a thing through the air. Motorcycles in general are not aerodynamic anyway. My bike has a vent at the bottom of the windshield to break up the low pressure area behind the shield and it really helps it move through the air and get better mileage. A windshield shaped to enhance aerodynamics can improve mpg, think Bonneville, but the majority of windshields are for rider protection and not to help the bike get through the air. If I remember right CanAm took a 70 mph dirt bike and went 137mph at Bonneville with a very aerodynamic windshield/fairing set up. Joe

"Robert Barker on a Can-Am motorcycle set the 125cc land speed record at. Bonneville at 136.537 mph – a record that still holds to this day"
battleax is offline   Reply With Quote
Old 01-06-2008, 07:29 AM   #19
QDM
Registered Member
 
Join Date: Aug 2006
Posts: 128
Country: United States
Unfortunately they didn't have digital cameras in 78, so it's a scan of a 4X6 print.

I went via the Alcan which was about 1400 miles of gravel road back then. Nowadays it's all paved. I covered a total of 17000 miles on the scooter that summer.

Q

Quote:
Originally Posted by 101mpg View Post
Was that pic of the Vespa colorized? LOL Seriously though - lots of pics of my childhood look that way too. I was 10 in 1978.

Did you actually do the Alcan highway or ferry up? How far was that trip? Ought to be a fun thread in its own right.
QDM is offline   Reply With Quote
Old 01-06-2008, 08:40 AM   #20
Registered Member
 
RningOnFumes's Avatar
 
Join Date: Nov 2007
Posts: 72
Country: United States
Quote:
Originally Posted by QDM View Post
Unfortunately they didn't have digital cameras in 78, so it's a scan of a 4X6 print.

I went via the Alcan which was about 1400 miles of gravel road back then. Nowadays it's all paved. I covered a total of 17000 miles on the scooter that summer.

Q

wow...just ... WOW.
__________________

__________________


RningOnFumes is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Not very precise mpg calculation larjerr Fuelly Web Support and Community News 4 08-20-2012 02:03 AM
Flywheels (what is the biggest automotive / truck / lorry one you know of?) landspeed General Maintenance and Repair 16 06-21-2007 05:03 PM
Honda Insight fuel cut on ScangageII silverinsight General Fuel Topics 5 03-13-2007 03:56 PM
diesel newbie here GasSavers_Brock Introduce Yourself - New member Welcome 17 10-30-2006 10:56 AM
"active" aero grille slats on 06 civic concept MetroMPG General Fuel Topics 21 01-03-2006 01:02 PM

Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 12:42 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.