New Electric M/C aero design is .11 CD

[Interested Observer]

Well, I have to take issue with Port Pie?s explanation.
Cd = drag coefficient - and is a dimensionless number that is used in calculations to relate a measured drag to the various fluid dynamic conditions existing while the drag was measured.  It is really just a fudge factor that allows the drag to be calculated for other fluid dynamic conditions.  There is no ?minimum? but smaller is better and generally ranges from zero to small single whole digits.
CdA = is the product of the drag coefficient, Cd, times the (generally frontal) area of the object of interest.  It has the dimensions of ?area?, or length squared.  It is indicative of the overall drag since it takes into account the frontal area of the object.  So, a barn door would have a greater CdA than a clipboard due to its larger area, even if the two rectangles might have similar Cd?s. 
CFD refers to computer based fluid dynamic analysis or analysis software in which an object is modeled in the computer and then subjected to simulated flow conditions with the ability to produce useful output such as the Cd, forces, moments, pressure distributions etc.  A wind tunnel on the desktop.

[Stan Back]

Thanx, Porkpie -- I got most of it -- and don't worry about your English -- sayanara
. . . and you, too, I.O. . . .

It all comes back to me now.  It's been a long time.  I remember it in 2nd grade how it came up while we were memorizing the atomic numbers of stuff.  How it slipped my mind, I don't know.

[donpearsall]

Hey Coleasterling - Welcome to the group. Post a pic of your bike and bodywork.

Don

[sabat]

What happened to PP?s post? Huh.

CFD= computational fluid dynamics, which I know roughly jack-chit about

[coleasterling]

Hey Coleasterling - Welcome to the group. Post a pic of your bike and bodywork.

Don

Thanks!

Here are a few from BMST. We saw 173mph peak from the gps on our best run, and our best average of two was around 167mph. To be seen what it will be when certification comes back, though that should be close.

[PorkPie]

...someone mentioned that my note was not necessary to write.....so I shared his opinion...and I delete my note..... :clap

What happened to PP?s post? Huh.

CFD= computational fluid dynamics, which I know roughly jack-chit about

[donpearsall]

Very nicely streamlined bike! I see there are notches on the sides so you can get your feet up and get into a semi-prone riding position. You must be pretty limber to do that! It looks fast just setting there. Good job!

Don

[coleasterling]

Very nicely streamlined bike! I see there are notches on the sides so you can get your feet up and get into a semi-prone riding position. You must be pretty limber to do that! It looks fast just setting there. Good job!

Don

Thank you! We spent hundreds of hours building and running CFD models. Hopefully we'll be able to get some wind tunnel time now that we've had some success.

[Stainless1]

I did not know FIM allowed dustbin fairings on anything but 3 wheels....

[coleasterling]

I did not know FIM allowed dustbin fairings on anything but 3 wheels....

We ran AMA since we were guaranteed the rules wouldn't change from 2019/2020 to 2021 and the FIM rules weren't published until...August?

Edit: I read back through them and I'm not seeing anything that specifically bans dustbin fairings. Can you specify which rule you're thinking of?

[donpearsall]

I don't know about FIM, but the AMA rules have not banned dustbin fairings in the 16 or so years I have been there. Lots of racers have run with that design over the years. Maybe SCTA has a rule against them?

Don

[coleasterling]

Speaking of electric motocycle aero...

https://www.roadandtrack.com/news/a38387770/max-biaggi-shatters-ev-motorcycle-speed-record-with-283-mph-run/

I had dreams of competing with them eventually...Not so much now.

[Lemming Motors]

I love the bikes name; like the Nazareth song....

Speed hertz, speed scars
Speed wounds and marks
Any heart
You better be tough enough or strong enough
To take a lot of pain, take a lot of pain
Speed is like a cloud
Holds lots of rain
Speed hertz
ooh, ooh, Speed hertz.

[Stainless1]

John, I was going to mention it's a little early to be drinkin'.... then I remembered it must have been around noon when you posted that...
I guess ya can't drink all day if you don't start early   

[edinlr]

After looking at the Voxan bike in the above link, I have to ask about the lack of fairing, or covering of the rear wheel.  Did they just make so much stinking power that they did not need it?  Is this some new aero advantage that we have not learned about?