Go Back   EcoModder Forum > EcoModding > Aerodynamics
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 06-18-2008, 01:58 AM   #1 (permalink)
Old Retired R&D Dude
 
Join Date: May 2008
Location: Woburn Mass USA
Posts: 702

Little Red - '12 Toyota Prius c 2 Two
90 day: 57.82 mpg (US)

"Whitey" Bulger - '14 Toyota RAV4 LE
Thanks: 10
Thanked 18 Times in 17 Posts
Bicycle drafting experiment

About 4 times a week, my wife and I take the same route into the next town
over and do 3 or 4 laps around a quite residential area.

There is a small hill where we get a quick 330 yard coast. Many times, we will stop at the top of the hill & take a water break before starting the coast down. I mostly let my wife get about 20-30 yards ahead before I take off.
Once I start rolling, I get up to about 15 MPH and coast down to 10 or 11 at the end of the run.
I always pass my wife. Due to my weight (205), I'm always down at the turn around point long before she gets there.
She pedals on her way down. I never do.. At the start, I've waited for her to get 50 yards ahead, I usually pass her before the the half way mark.

----

On our third lap this afternoon, I asked my wife to let me go first and for her to draft on me. I asked her to stay tucked in real close behind me.
I even told her to pedal a little if she needed to close up the space a bit.

Well, when we got about 40 yards down the hill, she asked me if I was hitting the brakes! "No", I wasn't. Then I see her pull off to the side a bit. (in the mirror)..
When we got down to the end, she explained. She was going so fast, that she would have hit me. She had to pull out to the side so our wheels wouldn't hit and she had to brake so she wouldn't pass me!!

I was amazed that she actually had to brake. If I had got on the pedals a little (up to 16 or 17 MPH), I think she would have kept right up with me, Without pedaling at all..

I think this was her fastest time down that hill..
Maybe tomorrow, I'll try going 16 and see if she stays in my draft while coasting..

I knew that drafting was common in bike racing, but I never knew just how effective it was.. These results were way more than I expected.

Cheers,
Rich

__________________
Cheers,
Rich

Current ride: 2014 RAV4 LE AWD (24 MPG)

Wife's Pizza Transporter
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 06-18-2008, 02:04 AM   #2 (permalink)
Dartmouth 2010
 
SVOboy's Avatar
 
Join Date: Nov 2007
Location: Hanover, NH
Posts: 6,447

Vegan Powa! - '91 Honda CRX DX
Team Honda
90 day: 66.52 mpg (US)
Thanks: 92
Thanked 122 Times in 90 Posts
Send a message via AIM to SVOboy Send a message via MSN to SVOboy Send a message via Yahoo to SVOboy
In a team time trial I will usually pull the downhills because I'm the heaviest of the group. On a downhill where I would easily outpace the other guys if I was in the back I can usually carry them up to 40 mph if they stay right on my wheel in a good tuck,
  Reply With Quote
Old 06-18-2008, 04:47 AM   #3 (permalink)
coasting....
 
Join Date: May 2008
Location: West Coast
Posts: 19
Thanks: 0
Thanked 0 Times in 0 Posts
Bicycles can be incredibly draggy. Back in my mountain biking days I would draft on fast single track.
  Reply With Quote
Old 06-19-2008, 12:42 PM   #4 (permalink)
EcoModding Lurker
 
Join Date: Apr 2008
Location: Regina, Saskatchewan
Posts: 73
Thanks: 0
Thanked 0 Times in 0 Posts
This is why all the HPV records are held by fully-faired recumbent bikes.
  Reply With Quote
Old 06-19-2008, 12:59 PM   #5 (permalink)
EcoModding Lurker
 
Warhawk626's Avatar
 
Join Date: Jun 2008
Location: Louisiana
Posts: 43

SlowZoom - '98 Mazda 626 DX
Last 3: 31.36 mpg (US)

Das Tank - '00 Dodge Carvan Base
Thanks: 0
Thanked 0 Times in 0 Posts
I drafted a tractor on my mountain bike, went 24mph which was 7 mph faster than usual on that stretch of road. Guy thought I was nuts but he was smiling the whole time
__________________
1998 Mazda 626 DX
2.0 4 cylinder
5 speed manual
AC and PS Delete
17x7 Drag DR 19 wheels ( I know )
Hankook z rated tires ( again, I know

Future plans: Mazda miata 14'' BBS wheels
  Reply With Quote
Old 06-19-2008, 01:22 PM   #6 (permalink)
ECO-Evolution
 
Lazarus's Avatar
 
Join Date: Nov 2007
Location: Central Texas
Posts: 1,482

Iron Horse (retired) - '97 Iron horse Intrepid

Ninja - '08 Kawasaki 250R
90 day: 76.23 mpg (US)
Thanks: 17
Thanked 45 Times in 34 Posts
Here's a little info on it.

Quote:
The rider causes 65% to 80% of the drag.
Quote:
When riding in a pack, the riders in the front use 30% to 40% more energy than the riders in the middle of the pack
__________________
"Judge a person by their questions rather than their answers."

  Reply With Quote
Old 06-19-2008, 02:50 PM   #7 (permalink)
Master EcoModder
 
Join Date: Jun 2008
Location: Earth
Posts: 5,209
Thanks: 225
Thanked 811 Times in 594 Posts
Quote:
Originally Posted by Warhawk626 View Post
I drafted a tractor on my mountain bike, went 24mph which was 7 mph faster than usual on that stretch of road. Guy thought I was nuts but he was smiling the whole time
Maybe because he'd just dropped the manure spreader?
  Reply With Quote
Old 06-19-2008, 03:14 PM   #8 (permalink)
EcoModding Lurker
 
Join Date: Apr 2008
Location: nc
Posts: 7
Thanks: 0
Thanked 1 Time in 1 Post
I thoght this might be interesting http://www.canosoarus.com/08LSRbicycle/LSR%20Bike01.htm
  Reply With Quote
Old 06-19-2008, 04:27 PM   #9 (permalink)
Old Retired R&D Dude
 
Join Date: May 2008
Location: Woburn Mass USA
Posts: 702

Little Red - '12 Toyota Prius c 2 Two
90 day: 57.82 mpg (US)

"Whitey" Bulger - '14 Toyota RAV4 LE
Thanks: 10
Thanked 18 Times in 17 Posts
The rider causes 65% to 80% of the drag. !!!

Wow! I would be thinking about getting more streamlined helmet if I wasn't riding my bike mostly for the aerobic workout I get..

Reading about hypermiling has already got me coasted way more on my bike..
Now I'm burning less calories per mile! Meaning I have to cut back on my ice cream! Dang!

Yesterday we went out for lunch (14 mile round trip) and now that I know
how good drafting works, I was tucking in every time my wife took point.
I wasn't upset that I had to keep using my brakes on hills,
Now that I understand more of why she always seemed to be braking..
It wasn't her braking! It was me speeding up too much..

We ride up-right bikes, so we are getting a good workout.
As you can see, I need it!!

Thanks Guys!
Rich
__________________
Cheers,
Rich

Current ride: 2014 RAV4 LE AWD (24 MPG)

Wife's Pizza Transporter
  Reply With Quote
Old 06-19-2008, 04:45 PM   #10 (permalink)
EcoModding Lurker
 
Join Date: Feb 2008
Location: Nuevo Mexico
Posts: 26

Speedster - '69 Schwinn Speedster
Thanks: 0
Thanked 2 Times in 2 Posts
One of my favorite scenes from Breaking Away is when Dave drafts the Cinzano truck -



Unfortunately, the video quality on this clip is pretty poor, but the scene is a lot of fun.

I have to say that riding in a paceline is a blast, but it does take a bit of practice.

Tim

__________________
- Cool. Practical. Sustainable. EcoDaddyo.com -
  Reply With Quote
Reply  Post New Thread




Similar Threads
Thread Thread Starter Forum Replies Last Post
I took out a guy on a bicycle with my truck.. Chris D. The Lounge 16 11-01-2008 11:00 PM
Making an electric bicycle (looking for advice) NoCO2 Alternative Transportation 44 06-04-2008 03:54 PM
So you DO need collision insurance for a bicycle!!! Peakster Alternative Transportation 11 05-14-2008 01:32 AM
Road Bicycle Buying Advice Gone4 Alternative Transportation 67 02-26-2008 09:40 PM
Engine-off experiment mattW Hypermiling / EcoDriver's Ed 8 02-18-2008 01:57 AM



Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com