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From: Rudeney on 5 Jul 2010 11:41 Brian wrote: > On Sat, 03 Jul 2010 11:53:40 -0500, Keane <keane(a)keanespics.com> > wrote: > > >> Don't use your odometer, it's just as inaccurate as your speedometer. >> Interstate mile markers are remarkably reliable, over a distance. >> The mileage must be going up, and you must stay in the right lane >> without weaving or changing lanes. It has to be done over a distance, >> since sometimes an accident will take out a mile marker, and some DOT >> guy will use the (uncalibrated) truck odometer to replant the sign. > > Back before GS, I would check it on trips when there was no traffic > usually over a period of ten miles. Yep, use the mile markers and a stopwatch over the longest distance where you can maintain a constant speed. That will rule out any issues with markers being misplaced. I have speed indicators on both my in-dash NAV system and my radar detector. They both agree, but my car's odometer tends to be off slightly, maybe by 1mph fast. My previous car was off by around 4mph at 80mph (faster than the GPS speed). -- - RODNEY Next WDW Vacation? Who knows! Need to know more about RADP (rec.arts.disney.parks)? http://www.radp.org http://allears.net/btp/radp_bk.htm http://allears.net/tp/abrev.htm Are you still accessing RADP via Google? Why? Get instructions on how to access to the "real" RADP Usenet Group here: http://meets.radp.org/usenet.htm
From: Keane on 5 Jul 2010 18:07 On Mon, 05 Jul 2010 10:41:54 -0500, Rudeney <rudeney(a)mickeypics.com> wrote: >Brian wrote: >> On Sat, 03 Jul 2010 11:53:40 -0500, Keane <keane(a)keanespics.com> >> wrote: >> >> >>> Don't use your odometer, it's just as inaccurate as your speedometer. >>> Interstate mile markers are remarkably reliable, over a distance. >>> The mileage must be going up, and you must stay in the right lane >>> without weaving or changing lanes. It has to be done over a distance, >>> since sometimes an accident will take out a mile marker, and some DOT >>> guy will use the (uncalibrated) truck odometer to replant the sign. >> >> Back before GS, I would check it on trips when there was no traffic >> usually over a period of ten miles. > >Yep, use the mile markers and a stopwatch over the longest distance >where you can maintain a constant speed. That will rule out any issues >with markers being misplaced. > >I have speed indicators on both my in-dash NAV system and my radar >detector. They both agree, but my car's odometer tends to be off >slightly, maybe by 1mph fast. My previous car was off by around 4mph at >80mph (faster than the GPS speed). When I used to TSD (Time-Speed-Distance) rally, we used to use a very specialized odometer. They were pretty much handmade. We epoxied two magnets on the inside of a tire rim, then mounted a fixed hall-effect sensor to read the magnets as they went by. We'd use the interstate mileage signs, and there was a four digit correction factor to make tire rotation match mileage. We were theoretically accurate to .01 miles in 60 miles. Changing a lane could increase your mileage by .02 or .03 miles. Of course, part of the deal on TSD rallies, is you don't know the course. (It's run on public roads.) I woulda killed for a GPS w/maps back then... (As a note, it's quite possible that they're using such a sensor for your odometer, counting revolutions of the transmission output shaft, rather than via the using the speedometer cable. If you back up, and your mileage still goes up, it's not attached to the speedometer cable...) Keane -- When stars are born, They possess a gift or two, One of them is this, They have the power to make a wish come true... -- Wishes Visit my site: http://keanespics.com
From: Rudeney on 6 Jul 2010 17:44 On 7/5/2010 5:07 PM, Keane wrote: > On Mon, 05 Jul 2010 10:41:54 -0500, Rudeney<rudeney(a)mickeypics.com> > wrote: > >> Brian wrote: >>> On Sat, 03 Jul 2010 11:53:40 -0500, Keane<keane(a)keanespics.com> >>> wrote: >>> >>> >>>> Don't use your odometer, it's just as inaccurate as your speedometer. >>>> Interstate mile markers are remarkably reliable, over a distance. >>>> The mileage must be going up, and you must stay in the right lane >>>> without weaving or changing lanes. It has to be done over a distance, >>>> since sometimes an accident will take out a mile marker, and some DOT >>>> guy will use the (uncalibrated) truck odometer to replant the sign. >>> >>> Back before GS, I would check it on trips when there was no traffic >>> usually over a period of ten miles. >> >> Yep, use the mile markers and a stopwatch over the longest distance >> where you can maintain a constant speed. That will rule out any issues >> with markers being misplaced. >> >> I have speed indicators on both my in-dash NAV system and my radar >> detector. They both agree, but my car's odometer tends to be off >> slightly, maybe by 1mph fast. My previous car was off by around 4mph at >> 80mph (faster than the GPS speed). > > When I used to TSD (Time-Speed-Distance) rally, we used to use a > very specialized odometer. They were pretty much handmade. We > epoxied two magnets on the inside of a tire rim, then mounted a fixed > hall-effect sensor to read the magnets as they went by. We'd use the > interstate mileage signs, and there was a four digit correction factor > to make tire rotation match mileage. We were theoretically accurate > to .01 miles in 60 miles. Changing a lane could increase your > mileage by .02 or .03 miles. > > Of course, part of the deal on TSD rallies, is you don't know the > course. (It's run on public roads.) I woulda killed for a GPS w/maps > back then... > > (As a note, it's quite possible that they're using such a sensor for > your odometer, counting revolutions of the transmission output shaft, > rather than via the using the speedometer cable. If you back up, and > your mileage still goes up, it's not attached to the speedometer > cable...) I know for a fact that my odometer is electronic and driven by a Hall Effect sensor in the transmission - there is no "speedometer cable". After discussing this, I watched it yesterday and found that it's about 1.5% off. At 80mph on my speedo, the GPS shows me at 79. -- - RODNEY Next WDW Vacation? Who knows! Need to know more about RADP (rec.arts.disney.parks)? http://www.radp.org http://allears.net/btp/radp_bk.htm http://allears.net/tp/abrev.htm Are you still accessing RADP via Google? Why? Get instructions on how to access to the "real" RADP Usenet Group here: http://meets.radp.org/usenet.htm
From: Blossom on 8 Jul 2010 18:54 On Jul 2, 11:12 am, Keane <ke...(a)keanespics.com> wrote: > On Wed, 30 Jun 2010 20:16:27 -0400, Brian <drmorrisnos...(a)comcast.net> > wrote: > > > > > > >On Wed, 30 Jun 2010 12:06:54 -0700 (PDT), Blossom > ><dznyknit...(a)yahoo.com> wrote: > > >>On Jun 29, 9:53 pm, Brian <drmorrisnos...(a)comcast.net> wrote: > >>> On Tue, 29 Jun 2010 09:34:40 -0400, Lisa Cubbon <cub...(a)bellsouth.net> > >>> wrote: > > >>> >> And because we're Hilton HHonors Diamond members, we get cooked to > >>> >> order breakfast included. > >>> >> B > >>> >Us too which helps.. Lisa > > >>> How many nights/yr. is that? > > >>Hilton HHonors > > >>Silver VIP -- 4 stays or 10 nights in a calendar year > >>Gold VIP -- 16 stays, 36 nights, or 60,000 base points in a calendar > >>year > >>Diamond VIP -- 28 stays, 60 nights, or 100,000 base points in a > >>calendar year > > >>Blossom > > >Thanks. That's a lot of nights for Diamond. > > There's a joke there. Something about a ring. But I better leave > it alone. > > Keane > -- > When stars are born, They possess a gift or two, > One of them is this, They have the power to make a wish come true... > -- Wishes > Visit my site:http://keanespics.com Hah! That ring will cost you the rest of your life if you find the right person to accept your gift & promise. S
From: Greg K. on 11 Jul 2010 08:26
On Sat, 03 Jul 2010 11:53:40 -0500, Keane <keane(a)keanespics.com> wrote: >On Sat, 03 Jul 2010 10:43:53 -0400, Greg K. <gregrph(a)mindspring.com> >wrote: > >>Brian, Rodney, >>My wife is a little more cautious (i.e. slower) driver than I am. We >>bought a gps a few years ago and I've noticed a discrepancy between >>the gps speed and speedometer speed. > >You can get that corrected, but it's hardly worth the effort. > >> Thde gps speed is always a 3-4 >>mph lower than the speedometer speed at highway speeds, not around >>town. What I always thought was 75-80mph was actually 71-76 mph. I've >>even confirmed it using stopwatch and odometer using cruise control. > >Why would you doubt the GPS? :-) Oh, I don't doubt the gps. I just don't have it with me everywhere I drive. I have noticed that the gps is 1-2 mph slower than the speedometer in school zones (gps=13mph, speedo=15mph) to 3-4 mph slower at highway speeds. I guess we just don't realize how inaccurate our speedometers are. Now, if the gpps would give SENSIBLE directions ALL the time, that would be a miracle! It's actually more accurate that you >think. I used to TSD Rally, and car speedometers are rarely accurate. >If the tires are new, try again in 50,000 miles. If other tire/wheel >options were available for your car, the speedometer might have been >calibrated for one of those. It could be, your speedometer is just >mis-calibrated. > >You say not around town. At 40mph, you should still be off by 1-2 >mph... Maybe not as noticeable. > >Don't use your odometer, it's just as inaccurate as your speedometer. >Interstate mile markers are remarkably reliable, over a distance. >The mileage must be going up, and you must stay in the right lane >without weaving or changing lanes. It has to be done over a distance, >since sometimes an accident will take out a mile marker, and some DOT >guy will use the (uncalibrated) truck odometer to replant the sign. > >>I chose a time when I was fairly certain there would be no >>construction or other slowdowns on the road and I wouldn't have to go >>off cruise control. > >Or do it in certain parts of the West (Montana comes to mind), where >you could park the car and have a picnic in the middle of the >interstate without any cars coming by... :-) (Mostly in the early >morning before the people that don't live there get on the road.) > >Keane |