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how to convert fps into mph

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Unread postAuthor: boilingleadbath » Sat May 12, 2007 12:42 pm

Freefall has been working at a job with intelligent adults too long, and has forgotten that the target market for this how-to article <i>actually exists</i>.

The fact that they may use this how-to reveals that they are too poorly educated, or have little enough practice thinking, that they did not realize that you could figure out the conversion factor through that dimensional analysis.

For these people, it is handy (although possibly detrimental to their education) to have a nice, handy, conversion factor they can multiply their fps by.
*********

Personaly, I figure it out through one of 3 ways:
1) Using a conversion factor of 1.5 fps/mph
It's off by a few percent, but it's a really nice number to work with mentaly.
2) Using a conversion factor of 1.47 fps/mph
I didn't intentionaly memorize it, but it saves me a few keystrokes when I'm using a calculator.
3) Using the 5280/(60*60) bit
Most accurate, when you have a calculator.
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Unread postAuthor: smiley face » Thu May 17, 2007 7:58 am

well i suppose ing every body is smart enouph to get a chronograph and get the fps off that and some chronographs will even tell the mph peaple who make cannons should be smart enouph
to see how fast they go so you know where to shoot and not to and it dosent take much to learn there are just alot o peaple that are stupid
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Unread postAuthor: joannaardway » Thu May 17, 2007 8:20 am

Grow up people - there is no need to argue. MPH isn't a commonly used spudding unit, so I don't see why we really have to be petty over conversion factor.

We don't work in terms of hours or miles - no spud will stay aloft for more than about 0.01 hours, and ranges don't extend to whole miles.

Can anyone note a time they absolutely had to use MPH as a spudding unit?
Ok, it might be neat to compare spud velocity to a car's speed (or something similar), but it's not truly necessary.

Sticking in fps and m/s is far more convient.

So what would be far more useful is explaining that there are 3.28 fps to 1 m/s, or .3048 m/s to 1 fps, because those consitute regularly used units.
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Novacastrian: How about use whatever the heck you can get your hands on?
frankrede: Well then I guess it won't matter when you decide to drink bleach because your out of kool-aid.
...I'm sorry, but that made my year.
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Unread postAuthor: smiley face » Thu May 17, 2007 9:00 am

one key factor in going from feet per second to mph is you need to know the feet per second of the cannon first most peaple here dont even know the cannons fps thats why when they say oh this type of valve is faster how do they know have they actualy tested it or do they just think becuse they spent more money on the valve and it lookes cool it shoots farther and lets more air threw it mph ist needed your right its just a cool factor of conversion you can say oh wow it shoots faster than a car

just somthing to think about
most cannons will shoot faster than hand guns if constructed right a nine millemeter only shoots at 6oo feat per second i have bb guns at 1000 fps and a paint ball gun at 300 feet per second goes 200 miles an hour rouphly
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Unread postAuthor: tomthebomb137 » Thu Jun 14, 2007 10:39 pm

I remember in Teched we would always use this single number
if you were goin from fps to mph you would multiply fps by .6818 and get a close aproximation of the mph. to go from mph, you would divide instead
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