[kach22i]

Equal to +9,500 MPG?

Video: 2016
Under the Hood of the Fastest Bike in the World

https://www.youtube.com/watch?v=BC5K...ature=emb_logo

2014
Eta's aerodynamic design
Eta's aerodynamic design — Aerovelo




From a forum post:

http://www.recumbents.com/forums/top...13&whichpage=8

At a wind speed of about 80 mph it only generates 6.25 Newtons of drag, which comes out to a Cd of .023. The bike has a frontal area of .34435 m^2.

I believe the Cda you have for Eta, maybe wrong. I first get this idea because one the Team Policumbent website they state "Considering a speed of 145 kph, air density of 1.18 kg/m3 and a frontal area of 0.284 m2, we get a Cd of 0.0218".

All of a sudden my numbers don't seem as unreasonable.

I also did some calulations for the Cda of based off a statistic that I found in an article which stated that Eta would only need 198 watts to go 90 kph. This would require (using a Crr of .005 and a bike weight of 6o lb and a air density of 1.22kg/m^3) a Cda value of about .007 @ 90 kph which is far lower than the cda of my design. of course this value would decrease a higher speeds.

Of course simulations do not provide a 100% accurate portrayal of the real world but can certainly help for analyzing trends from iteration to iteration.

So to sum up, I believe the Cda value of Eta is a lot lower that what you have listed. This not only would make sense based off my findings, but the results of Team Policumbents Taurus speed bike which give a Cda of .0061912, and as we know, they don't hold the world record at this time, so it may be a safe assumption to say that Eta is more aerodynamic.

2015
the fastest human on earth
https://tingilinde.typepad.com/oment...-on-earth.html

A person on a bike isn't the most aerodynamic object. The equation I derived is sensitive to the area of the air column you travel through. This turns out to the the cross section frontal area of the moving object times a coefficient of drag - a term that depends strongly on the shape of the object. A Tour de France racer in a racing tuck has a coefficient of drag, a Cd, of about 0.7 and presents a cross section of about 0.5 square meters to the wind. Someone riding a casual commuter bike has a larger Cd and cross sectional area. They effectively travel through a larger tube of air, but at a much lower speed.

Velomobiles are streamlined bicycles. They're rarely seen in the US - perhaps a few thousand have been made and mostly in Germany and the Netherlands. Commercial models have frontal areas similar to that of a cyclist, but the Cd is usually in the 0.1 to 0.15 range - tiny by the standard of even the most aerodynamic cars.2 Even though they're larger and heavier than a regular bicycle, it is relatively easy for a normal rider to cruise along at 25 mph.

The Aerovelo Eta Todd Reichert piloted is the part of a serious engineering project involving some University of Toronto people. The Eta's frontal area is 0.35 m2 and its Cd is an astounding 0.038. A bit of calculating shows the Eta should be nearly three times as fast as a Tour de France road bike at speed with the same power input.3

To put this in context, this bike is about as fast as the fastest hovercraft on record.

I don't know why so much dispute about it's Cd, and why it isn't clearly listed on their website.

EDIT

This one looks road ready, and it leans.

The Fastest Bike in the World

https://www.youtube.com/watch?v=nhv0jrsAW5w

Velox4 streamliner
https://www.recumbent.news/2015/01/0...-in-the-world/

https://www.reddit.com/r/BicycleEngi..._these_things/

https://www.youtube.com/watch?v=kT6cL3a20gE

http://wimschermer.blogspot.com/2014...on-2014-2.html