"Bob Throllop" <bobthrol... at (no spam) brandx.net> wrote> I've been wondering how much difference streamlined fairings make to a
cycle's gas mileage.  Does anyone have any figures?  And in
particular, would putting a windshield on my otherwise naked 650 make
any difference at all?

Fairings do a lot at racing speeds (over 100 mph) but don't expect any
measurable improvement in gas mileage at typical street speeds. Windshields
are almost as streamlined as barn doors and may actually reduce mileage on
70 mph roads.  Their main advantage on a street bike in weather and insect
protection.

Something along the lines of what Craig Vetter designs would help...
But they are a bit extreme....

http://www.craigvetter.com/

On Jul 1, 8:53 am, Outback Jon <team... at (no spam) ver.no.sp.am.izon.net> wrote:

Something along the lines of what Craig Vetter designs would help...
But they are a bit extreme....

http://www.craigvetter.com/

I've seen what he does to a GL1000. No thankyou very much...it's ugly
and embarassing. I can do one or the other but not both at the same
time. <shrug> Honda hasn't done much better with the GL series, the
latest being the ugliest imnsho. I stick to naked bikes tyvm, cross
winds aren't a problem, just stick out a knee.

In article
0944e010-19dd-4619-876f-c775271a5021 at (no spam) z32g2000prh.googlegroups.com>,
"S'mee" <stevenkeith2 at (no spam) hotmail.com> wrote:

On Jul 1, 8:53 am, Outback Jon <team... at (no spam) ver.no.sp.am.izon.net> wrote:

Something along the lines of what Craig Vetter designs would help...
But they are a bit extreme....

http://www.craigvetter.com/
I've seen what he does to a GL1000. No thankyou very much...it's ugly
and embarassing. I can do one or the other but not both at the same
time. <shrug> Honda hasn't done much better with the GL series, the
latest being the ugliest imnsho. I stick to naked bikes tyvm, cross
winds aren't a problem, just stick out a knee.

I looked at the web site. I liked the name of the "Liberator" fairing
for Harley Davidsons. The name reminds me of a WWII bomber. The fairing,
however, reminds me of a WWII bomber.

"Bob Throllop" <bobthrollop at (no spam) brandx.net> wrote
I've been wondering how much difference streamlined fairings make to a
cycle's gas mileage. Does anyone have any figures? And in
particular, would putting a windshield on my otherwise naked 650 make
any difference at all?

Fairings do a lot at racing speeds (over 100 mph) but don't expect any
measurable improvement in gas mileage at typical street speeds. Windshields
are almost as streamlined as barn doors and may actually reduce mileage on
70 mph roads. Their main advantage on a street bike in weather and insect
protection.

BMW (of course) was the first manufacturer to provide a fairing as
part of the motorcycle

Classic Rider <ClassicRider at (no spam) 2wheelclassics.com> wrote:

Does anyone have any figures?

On a fully streamlined motorcycle, only 5hp is needed to reach and
sustain 100mph. On an unstreamlined motorcycle this rises to about
42hp.

What would be your definition of fully streamlined?

Assuming a cW of round 0,7 and a frontal area A of around 0,6 for the
naked bike needing 42hp to sustain 100 mph, plugging those into
F=0.5*rho*cW*A*v^2 results in an expected cW of 0.08 for the fully
streamlined bike requiring 5hp to sustain 100 mph.

Not to say that's impossible, such vehicles exist. Here's one:

http://www.paccar.ethz.ch/pictures/pac_car_II_miscellaneous/15?hires

You may notice missing similarity to this:

http://www.motorcycledaily.com/haya.jpg

"Marc Gerges" <marc.gerges at (no spam) gmail.com> wrote in message
news:5u25n5-fu1.ln1 at (no spam) pascal.gerges.lu...
Classic Rider <ClassicRider at (no spam) 2wheelclassics.com> wrote:

Does anyone have any figures?

On a fully streamlined motorcycle, only 5hp is needed to reach and
sustain 100mph. On an unstreamlined motorcycle this rises to about
42hp.

What would be your definition of fully streamlined?

Why, a cD of zero, of course...

Classic Rider <ClassicRider at (no spam) 2wheelclassics.com> wrote:


The difference is incredible. When fully streamlined motorcycles
starting reach speeds of 180 mph in Grand Prix racing they were
banned. Now only half fairings are allowed to help keep the speeds
down.

Christ, you talk as much crap as Krusty. The 'dustbin' full enclosures
that you're taslking about were banned because of their deadly
aerodynamic effects in sidewinds.

Does anyone have any figures?

On a fully streamlined motorcycle, only 5hp is needed to reach and
sustain 100mph.

I really, really doubt this, but am happy to be enlightened. Which
bikes, where, when?

On an unstreamlined motorcycle this rises to about
42hp.

Utter bollocks again. We've done this before. It's about 30bhp.

The 8hp Volkswagen 1 liter car, which is two passenger and weighs
about 600 lbs. reaches about 85mph. It also burns diesel fuel at the
rate of about 265 miles per gallon. When arrives in 2010-2012 it will
achieve only about 150mpg due to cost savings.

No Googling throws this up.

Any more details? Because I seriously doubt
an 8bhp car weighing a quarter of a ton will do 85mph and 265mpg

Honda's 5hp Super Cut (now havin sold over 60,000,000 units) has a
steady state fuel consumptio rate of 315 mpg at about 36mph.

This is yet more nonsense. The C50 (aka Super Cub) will do well over
100mpg, but over 300 is pure fantasy. Top whack of a C50 stepthru is
about 40mph+, so 36 is going quite fast.

(PS: I've ridden quite a few)

Where do you get this shit from?

Vito <vito at (no spam) xxcrosslink.net> wrote:

Once truth is lost the ignorant can invent the
silliest reasons for things.

Bob Myers <nospamplease at (no spam) address.invalid> wrote:

"The Older Gentleman" <totallydeadmailbox at (no spam) yahoo.co.uk> wrote in message
news:1ili153.cbtx6sjmpjelN%totallydeadmailbox at (no spam) yahoo.co.uk...

The 8hp Volkswagen 1 liter car, which is two passenger and weighs
about 600 lbs. reaches about 85mph. It also burns diesel fuel at the
rate of about 265 miles per gallon. When arrives in 2010-2012 it will
achieve only about 150mpg due to cost savings.

No Googling throws this up. Any more details? Because I seriously doubt
an 8bhp car weighing a quarter of a ton will do 85mph and 265mpg


First, locate a high, high cliff....

As far as I know, pearls ALWAYS come from a bit of
debris irritating a sort of mollusk that lives in brackish water...

I didn't know you were an invertibrate. Huh, learn something
everday...a motorcycle riding mollusk, only on reeky I guess.

On Fri, 22 Aug 2008 14:06:34 -0700 (PDT), "S'mee"





stevenkei... at (no spam) hotmail.com> wrote:
On Aug 22, 2:27 pm, Turby <turbosur... at (no spam) beach.comber> wrote:
On Fri, 22 Aug 2008 12:58:07 -0700 (PDT), "S'mee"

stevenkei... at (no spam) hotmail.com> wrote:
LOL who the hell drives 45mph on the highway except for the stoned and
the geriatric. Oh and dumbass like the converters of cars like you
mention. Show me 100mpg with a full sized car/pickup/semi-trailer then
I'll be interested in it. Interested in how to adapt teh technology to
a motorcycle.

I'm still waiting for the production Bulldog. And hoping it'll be
something less than the announced $18k.
A real 105mpg at (no spam) 45mph on a machine that spends a lot of time at that
speed. (Who wants to spend all day on an interstate, anyway?):http://www.dieselmotorcycles.com/models.htm

I dunno on most of the dirt roads I've driven on over the years I
rarely went below 60mph in daylight and that is on a street bike

630 miles on 6 gal of biodiesel, which costs ~$1/gal.
San Diego to Reno on one tank of gas and $6. Sounds good to me.

Yebbut there is a fly in the ointment. The Bulldog is indefinately
delayed due to military purchases and an apparently lack of ability to
expand production capability...but that is just speculation on my
part.

Yeah. OTOH, if the Iraq excursion ends, mebbe...