Anemometer for travel speed calibration? - Fuelly Forums

Android Users - Coming Soon! - Migrating from aCar 4.8 to 5.0

Reply
 
Thread Tools Display Modes
 
Old 04-22-2009, 08:25 AM   #1
Registered Member
 
Join Date: Mar 2009
Posts: 1,139
Country: United States
Anemometer for travel speed calibration?

I was trying to think of very accurate ways to calibrate my speedometer and was thinking an anemometer might be a good way to go. I also happen to own one already. They're pretty accurate is my understanding and not too expensive. My work with the coast down math shows it's pretty sensitive to systematic errors in logging the speed and since tire wear can change that sort of thing I want a fast way to recalibrate. Cheap GPS receivers have a mixed reputation for instantaneous accuracy, at least according to the searches I did. I'd just use highway mile markers but I'm not very close to one.

I worry about issues with the air turbulence right next to the vehicle effecting the anemometer, so maybe I'd need to put it on a mast?

The craziest idea I've had so far in my brainstorming has been to make a timed sprayer that marks the road during the coast down test. Then I could measure the mark spacings. Like I said...crazy.
__________________

__________________


Main Entry: co de pen dence - see codependency
co de pen den cy
Pronunciation: \kō-di-ˈpen-dən(t)-sē\
Function: noun
Date: 1979

: a psychological condition or a relationship in which a person is controlled or manipulated by another who is affected with a pathological condition (as an addiction to alcohol or heroin) ; broadly : dependence on the needs of or control by another
GasSavers_maximilian is offline   Reply With Quote
Old 04-22-2009, 09:09 AM   #2
Site Team / Moderator
 
Jay2TheRescue's Avatar
 
Join Date: Sep 2008
Location: Northern Virginia
Posts: 4,657
Country: United States
Location: Northern Virginia
You want to accurately calibrate your speedometer? Use a GPS. An annemometer will be effected by turbulence from passing vehicles, and also by wind.
__________________

__________________






Jay2TheRescue is offline   Reply With Quote
Old 04-22-2009, 02:54 PM   #3
Registered Member
 
Join Date: Mar 2009
Posts: 1,139
Country: United States
I was locked into considering options that have reliable instantaneous accuracy, but for speedometer calibration I don't actually require that. I can average it over a period while maintaining a steady speed. Then I can use the calibrated speedometer to do the coast down. OK, check that one off. Thanks.
__________________


Main Entry: co de pen dence - see codependency
co de pen den cy
Pronunciation: \kō-di-ˈpen-dən(t)-sē\
Function: noun
Date: 1979

: a psychological condition or a relationship in which a person is controlled or manipulated by another who is affected with a pathological condition (as an addiction to alcohol or heroin) ; broadly : dependence on the needs of or control by another
GasSavers_maximilian is offline   Reply With Quote
Old 04-24-2009, 10:12 AM   #4
Registered Member
 
Join Date: Jan 2008
Posts: 62
Country: United States
You could also use Google Earth to determine the distance along your stretch of road.
Nrggeek is offline   Reply With Quote
Reply

Thread Tools
Display Modes

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Fuelly Android App - eehokie Fuelly Web Support and Community News 2 07-14-2010 09:59 PM
New tires are on! Jetta90GL General Maintenance and Repair 13 12-02-2008 11:17 AM
Pics of new (lightweight?) Ford Fiesta - coming to US in 09 MetroMPG Automotive News, Articles and Products 4 08-29-2007 10:06 PM
MID Install SVOboy Experiments, Modifications and DIY 33 06-04-2007 11:27 AM
State of the Union address touches on "oil addiction." Matt Timion General Discussion (Off-Topic) 31 02-06-2006 04:38 PM

Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 03:15 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.