who can estimate their mph.... - Snowboarding Forum

RoughedgesMR · 02-04-2009, 04:30 PM

Me and my friends were talking. We have no clue or couldnt even estimate the mph we get to. i plan on taking my boat gps next time i go. Problary this weekend. It has a top speed hold so when i get to the bottom i can check the top speed went. So has anyone ever done this out of pure curiosity?

shredder07 · 02-04-2009, 04:33 PM

i have but for some reason it wouldn't clock my speed. i tried with a tom-tom gps. i kept it in my pocket though so that might have been the problem

legallyillegal · 02-04-2009, 04:33 PM

gps won't tell you velocity

02-04-2009, 04:55 PM

You could just find a run of predetermined length and time yourself going down. Your GPS will most likely have trouble because it won't be accounting for the slope.

RoughedgesMR · 02-04-2009, 04:55 PM

Quote:

Originally Posted by legallyillegal

gps won't tell you velocity

it will tell you mph.

Technine Icon · 02-04-2009, 04:57 PM

I know it's kinda ridiculous, but if u really want to know, u could rent a radar gun.

RoughedgesMR · 02-04-2009, 05:04 PM

Quote:

Originally Posted by Technine Icon

I know it's kinda ridiculous, but if u really want to know, u could rent a radar gun.

i have used my boat gps from top end runs in my car to , quads, dirtbikes, streetbikes, shifter karts, pocket bikes, boats, shit i even strapped it to my rc cars. I dont understand what that guy is talking about with velocity.

Dawg Catcher · 02-04-2009, 05:10 PM

In physics, velocity is defined as the rate of change of position. It is a vector physical quantity; both speed and direction are required to define it. In the SI (metric) system, it is measured in meters per second: (m/s) or ms-1. The scalar absolute value (magnitude) of velocity is speed. For example, "5 meters per second" is a scalar and not a vector, whereas "5 meters per second east" is a vector. The average velocity v of an object moving through a displacement (Δx) during a time interval (Δt) is described by the formula:

what he is trying to say is because your gps wont chart your vector/slope angle you wont chart velocity which is not what you wanted to do in the first place. pay no mind to douche bag 2 his posts or almost as meaningless as mine.

jeri534 · 02-04-2009, 05:10 PM

You wont get an accurate reading with a GPS because you are not traveling on a flat ground

sgauto08 · 02-04-2009, 05:28 PM

dude just mak it into a physics problem it's easy figure out the distance that your going, time yourself and with just those two things you could figure out your average velocity. But if you wanted to find out your final velocity take your distance multiply it by 2 and divide that by your time and that should give you your final velocity which is what your looking for. And after that if you wanted you could find your acceleration for that distance. That should work. its actually easy or at least it is for me.

02-04-2009, 04:30 PM	#1 (permalink)
RoughedgesMR Member Join Date: Dec 2008 Posts: 70	who can estimate their mph.... Me and my friends were talking. We have no clue or couldnt even estimate the mph we get to. i plan on taking my boat gps next time i go. Problary this weekend. It has a top speed hold so when i get to the bottom i can check the top speed went. So has anyone ever done this out of pure curiosity?

02-04-2009, 04:33 PM	#3 (permalink)
legallyillegal -LIFETIME MEMBER- Join Date: Oct 2008 Location: fuck Snowboarding Posts: 4,446	gps won't tell you velocity __________________ THERE ARE SPECIFIC REASONS AS TO WHY I AM MORE LOCAL THAN YOU GOD IS DONUT

02-04-2009, 05:10 PM	#8 (permalink)
Dawg Catcher Senior Member Join Date: Jan 2009 Location: Back to Arizona Posts: 915	In physics, velocity is defined as the rate of change of position. It is a vector physical quantity; both speed and direction are required to define it. In the SI (metric) system, it is measured in meters per second: (m/s) or ms-1. The scalar absolute value (magnitude) of velocity is speed. For example, "5 meters per second" is a scalar and not a vector, whereas "5 meters per second east" is a vector. The average velocity v of an object moving through a displacement (Δx) during a time interval (Δt) is described by the formula: what he is trying to say is because your gps wont chart your vector/slope angle you wont chart velocity which is not what you wanted to do in the first place. pay no mind to douche bag 2 his posts or almost as meaningless as mine. __________________

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02-04-2009, 04:33 PM	#2 (permalink)
shredder07 Senior Member Join Date: Oct 2008 Posts: 179	i have but for some reason it wouldn't clock my speed. i tried with a tom-tom gps. i kept it in my pocket though so that might have been the problem

02-04-2009, 04:55 PM	#4 (permalink)
Gimpystyle Guest Posts: n/a	You could just find a run of predetermined length and time yourself going down. Your GPS will most likely have trouble because it won't be accounting for the slope.

02-04-2009, 04:57 PM	#6 (permalink)
Technine Icon Senior Member Join Date: Jan 2009 Location: CT Posts: 1,252	I know it's kinda ridiculous, but if u really want to know, u could rent a radar gun.

02-04-2009, 05:10 PM	#9 (permalink)
jeri534 Senior Member Join Date: Feb 2008 Posts: 393	You wont get an accurate reading with a GPS because you are not traveling on a flat ground

02-04-2009, 05:28 PM	#10 (permalink)
sgauto08 Senior Member Join Date: Jan 2009 Location: ...at my house... duh Posts: 121	dude just mak it into a physics problem it's easy figure out the distance that your going, time yourself and with just those two things you could figure out your average velocity. But if you wanted to find out your final velocity take your distance multiply it by 2 and divide that by your time and that should give you your final velocity which is what your looking for. And after that if you wanted you could find your acceleration for that distance. That should work. its actually easy or at least it is for me.