General Cycling Discussion Have a cycling related question or comment that doesn't fit in one of the other specialty forums? Drop on in and post in here! When possible, please select the forum above that most fits your post!

Aerodynamic Charts and Graphs

Old 03-20-19, 04:50 PM
  #1  
hotbike
Senior Member
Thread Starter
 
hotbike's Avatar
 
Join Date: Dec 2006
Location: Long Island, New York
Posts: 3,275

Bikes: a lowrider BMX, a mountain bike, a faired recumbent, and a loaded touring bike

Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 143 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Aerodynamic Charts and Graphs



Aerodynamic Drag ©1983 Douglas Malewicki


​​​​​​You may have seen some photos of my Aerodynamic Fairings. Most of my bikes have been upright bikes and Not Recumbents. I wanted to set up manufacturing for crates or panniers, molded in plastic such as HDPE or Polypropylene. When I started cycling the two main types of Bicycle were Racing or Touring. It was before Mountain Bikes. Nowadays, most "touring bikes" are actually Mountain Bikes. My theory was that a streamlined Touring Bike could go faster than a Racing Bike. Okay, keep in mind, Fairings are prohibited from Racing because they are "Cheating", and there are no timing officials to deal with on a transcontinental tour.
I've built a couple dozen prototypes, which I won't show here. Today I want to show the charts and graphs I studied before going whole hog into this project.
Some of these appeared in the December 1983 Scientific American , and are used with permission of the author , Douglas Malewicki.




Short Term Human Power


Long Term Human Power


Theoretical Aerodynamic Performance ©1983 Douglas Malewicki
hotbike is offline  
Old 03-20-19, 05:13 PM
  #2  
caloso
Packfodding 3
 
caloso's Avatar
 
Join Date: Jul 2002
Location: Sacramento, California, USA
Posts: 37,729

Bikes: Ridley Excalibur, Gazelle Champion Mondial, On-One Pompino, Specialized Rock Hopper

Mentioned: 53 Post(s)
Tagged: 0 Thread(s)
Quoted: 1701 Post(s)
Likes: 0
Liked 3 Times in 3 Posts
How does Malewicki define "first class athlete"?
caloso is online now  
Old 03-20-19, 06:20 PM
  #3  
Kapusta
Cyclochondriac
 
Join Date: Feb 2017
Posts: 1,970
Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
Quoted: 826 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
The second chart illustrates what I have been saying for years: A bar of soap is less aero than a can of spam.
Kapusta is offline  
Old 03-20-19, 06:36 PM
  #4  
hotbike
Senior Member
Thread Starter
 
hotbike's Avatar
 
Join Date: Dec 2006
Location: Long Island, New York
Posts: 3,275

Bikes: a lowrider BMX, a mountain bike, a faired recumbent, and a loaded touring bike

Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 143 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by caloso View Post
How does Malewicki define "first class athlete"?
.
I believe that would mean Olympic level, or cat 1 cyclist .
hotbike is offline  
Old 03-20-19, 11:34 PM
  #5  
caloso
Packfodding 3
 
caloso's Avatar
 
Join Date: Jul 2002
Location: Sacramento, California, USA
Posts: 37,729

Bikes: Ridley Excalibur, Gazelle Champion Mondial, On-One Pompino, Specialized Rock Hopper

Mentioned: 53 Post(s)
Tagged: 0 Thread(s)
Quoted: 1701 Post(s)
Likes: 0
Liked 3 Times in 3 Posts
Originally Posted by hotbike View Post
.
I believe that would mean Olympic level, or cat 1 cyclist .
Huh. If thatís the case, I think his short term curve is off. I know of at least one masters Cat 3 who can put out .8 hp (600w) for a minute. Heís never going to make Cat 1, much less the Olympics.
caloso is online now  
Old 03-21-19, 12:51 PM
  #6  
Koyote
Senior Member
 
Join Date: Sep 2017
Posts: 585
Mentioned: 8 Post(s)
Tagged: 0 Thread(s)
Quoted: 277 Post(s)
Likes: 0
Liked 2 Times in 1 Post
All I got is that I am, at best, a "healthy human."
Koyote is offline  
Old 03-21-19, 03:02 PM
  #7  
hotbike
Senior Member
Thread Starter
 
hotbike's Avatar
 
Join Date: Dec 2006
Location: Long Island, New York
Posts: 3,275

Bikes: a lowrider BMX, a mountain bike, a faired recumbent, and a loaded touring bike

Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 143 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Okay, I was looking at the text, so to define "first class athlete" , it should be noted the researchers averaged together results from men and women, and made no regard for the cyclists weight.
hotbike is offline  
Old 03-21-19, 04:59 PM
  #8  
mcours2006
Senior Member
 
mcours2006's Avatar
 
Join Date: Jul 2014
Location: Toronto, CANADA
Posts: 5,599

Bikes: Giant Rapid, Bianchi Advantage, Specialized Roubaix, 1985 Gardin Quatro, Norco Threshold, Raleigh Serengheti MTB

Mentioned: 41 Post(s)
Tagged: 0 Thread(s)
Quoted: 1674 Post(s)
Likes: 0
Liked 1 Time in 1 Post
I'm going to have to ride 'perfect prone' Superman style tomorrow afternoon with 60 kph wind gusts. Now how the heck do I pedal?
mcours2006 is offline  
Old 03-22-19, 09:31 AM
  #9  
hotbike
Senior Member
Thread Starter
 
hotbike's Avatar
 
Join Date: Dec 2006
Location: Long Island, New York
Posts: 3,275

Bikes: a lowrider BMX, a mountain bike, a faired recumbent, and a loaded touring bike

Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 143 Post(s)
Likes: 0
Liked 0 Times in 0 Posts



Unified Performance Graphs ©1983 Douglas Malewicki


Vector on the cover of Scientific American December 1983


Modified version of Douglas Malewicki's Unified Performance Graphs.
hotbike is offline  
Old 03-22-19, 05:10 PM
  #10  
Road Fan
Senior Member
 
Road Fan's Avatar
 
Join Date: Apr 2005
Location: Ann Arbor, MI
Posts: 13,995

Bikes: 1980 Masi, 1984 Mondonico, 1984 Trek 610, 1980 Woodrup Giro, 2005 Mondonico Futura Leggera ELOS, 1967 PX10E, 1971 Peugeot UO-8

Mentioned: 24 Post(s)
Tagged: 0 Thread(s)
Quoted: 720 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by caloso View Post
How does Malewicki define "first class athlete"?
Way better than me.
Road Fan is offline  
Old 03-22-19, 05:31 PM
  #11  
hotbike
Senior Member
Thread Starter
 
hotbike's Avatar
 
Join Date: Dec 2006
Location: Long Island, New York
Posts: 3,275

Bikes: a lowrider BMX, a mountain bike, a faired recumbent, and a loaded touring bike

Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 143 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by road fan View Post
way better than me.
​​​​​​​lmao
hotbike is offline  
Old 03-22-19, 07:53 PM
  #12  
RChung
Senior Member
 
Join Date: Sep 2009
Posts: 1,447
Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
Quoted: 264 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by hotbike View Post
Some of these appeared in the December 1983 Scientific American , and are used with permission of the author , Douglas Malewicki.


Thanks. Very nice. I remember these from that issue of Scientific American. I kept it on my bookshelf for several years. These bring back pleasant memories.
RChung is offline  

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


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.