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Fps To Mph  
User currently offlineBryan Becker From United States of America, joined Mar 2001, 333 posts, RR: 0
Posted (13 years 8 months 1 day 13 hours ago) and read 1872 times:

Is there a way to take fps that a plane or object is going and find out what the speed is of the plane or object. Smile it would realy help me out.THANKS!!!!!!


-BryanBecker Big thumbs up

17 replies: All unread, jump to last
 
User currently offlineSabenapilot From Belgium, joined Feb 2000, 2728 posts, RR: 46
Reply 1, posted (13 years 8 months 1 day 13 hours ago) and read 1806 times:

Hey, have you ever been to school or what?  Big grin

Anyway, the conversion factor is around 2!!!

for instance: wind is reported to be 10 meters per second (done so in Eastern Europe). How much is that in knots? Answer: 20 kts!

You want the prove of this?
10 MPS
= 36000 MPH (since there are 3600 seconds in 1 hour)
= 36KMPH (since there are 1000 meters in 1KM)
= 20 KTS (since 1KT = 1NMH and 1NM = +/- 1.8KM)

I hope you see how easy this is.



User currently offlineSabenapilot From Belgium, joined Feb 2000, 2728 posts, RR: 46
Reply 2, posted (13 years 8 months 1 day 13 hours ago) and read 1793 times:

I've only now noticed you asked for the conversion factor of FPS ,ot MPS, to KTS.
However, the system remains the same.

Since: 3.3 FT = 1M
you'd have to devide the above conversion factor by 3,3 to find the new value.

So 0,6 would be a fine value.

That's really all there is to say about it.


User currently offlinePrebennorholm From Denmark, joined Mar 2000, 6540 posts, RR: 54
Reply 3, posted (13 years 8 months 1 day 12 hours ago) and read 1795 times:

Bryan, one statute mile is 5300 feet (roughly, the exact number you will have to ask an American about, I never use feet and I never use miles).

An hour is 3600 seconds - exactly - that counts in metric countries too!

So take your fps, divide by 3600, multiply by 5300, and the result is mph - roughly. Or multiply by 1.47 (5300 / 3600) - roughly, even more so.

If on the other hand you want to convert knots (nautical miles per hours), then one Nm = roughly 6080 feet, so the factor becomes roughly 1.69 instead.

You might also go metric and measure speeds in m/s or km/h. Then the factor is 3.6 - not roughly, but exactly! And all your troubles would be gone.  Big thumbs up

Best regards, Preben Norholm



Always keep your number of landings equal to your number of take-offs, Preben Norholm
User currently offlinePrebennorholm From Denmark, joined Mar 2000, 6540 posts, RR: 54
Reply 4, posted (13 years 8 months 1 day 12 hours ago) and read 1780 times:

Oh no, I divided where I should have multiplied and visa versa.

Somehow Sabenapilot got it almost right (even if it is beyond me how he managed that).

So the factors are:
fps -> mph: 0.68 (3600 / 5300)
fps -> knots: 0.59 (3600 / 6080)

The factors in my former post are valid for converting mph to fps or knots to fps.

You should go metric. At least you could start doing it inch by inch.

Cheers, Preben Norholm



Always keep your number of landings equal to your number of take-offs, Preben Norholm
User currently offlineUSAFHummer From United States of America, joined May 2000, 10685 posts, RR: 52
Reply 5, posted (13 years 8 months 1 day 12 hours ago) and read 1773 times:

Preben,

FYI a statute mile is 5280 ft.

Greg



Chief A.net college football stadium self-pic guru
User currently offlinePrebennorholm From Denmark, joined Mar 2000, 6540 posts, RR: 54
Reply 6, posted (13 years 8 months 1 day 11 hours ago) and read 1771 times:

Tnx a lot Greg. As a metric guy I had to walk around a few metric conversions, and my rough figure came out at 5292.7631 feet. I will try to remember 5280, at least until tomorrow.

I counted one foot as 0.304 m, but 0.3047 m is a better value. Must be since I know that a yard (3 feet) is pretty close to 0.914 m. It would have landed me on 5280.6038 feet.

Happy landing, Preben Norholm



Always keep your number of landings equal to your number of take-offs, Preben Norholm
User currently offlineBryan Becker From United States of America, joined Mar 2001, 333 posts, RR: 0
Reply 7, posted (13 years 8 months 1 day 9 hours ago) and read 1766 times:

They don't teach that stuff in high school math!!!!!!!!!

Thanks for your post anyway Smile



-BryanBecker Big thumbs up


User currently offlineJG From United States of America, joined Jun 2005, 0 posts, RR: 1
Reply 8, posted (13 years 8 months 23 hours ago) and read 1754 times:

Yes they do Bryan

User currently offlineJetpilot500 From United States of America, joined Nov 2000, 78 posts, RR: 0
Reply 9, posted (13 years 8 months 21 hours ago) and read 1752 times:

Its called basic algebra.


User currently offlineFlight152 From United States of America, joined Nov 2000, 3413 posts, RR: 6
Reply 10, posted (13 years 8 months 15 hours ago) and read 1736 times:

Yes they do, I'm in 10th grade and I've done that like a year ago.

User currently offlineFlight152 From United States of America, joined Nov 2000, 3413 posts, RR: 6
Reply 11, posted (13 years 8 months 13 hours ago) and read 1729 times:

Did you drop out of school?

User currently offlineBryan Becker From United States of America, joined Mar 2001, 333 posts, RR: 0
Reply 12, posted (13 years 8 months 12 hours ago) and read 1726 times:

Well out in Mesa they don't,I know people that are out of school and did not know how to do it,and yes I am in school!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Thanks experts!!!!!!! Smile



-Bryanbecker Big thumbs up


User currently offlineAmbasaid From , joined Dec 1969, posts, RR:
Reply 13, posted (13 years 7 months 4 weeks 1 day 16 hours ago) and read 1715 times:

Can I ask why you want to convert vertical velocity expressed in FPM in to Speed?

User currently offlineMax Power From , joined Dec 1969, posts, RR:
Reply 14, posted (13 years 7 months 4 weeks 1 day 14 hours ago) and read 1712 times:

Ahhh, give Bryan a break. Just a little one? We were all absent from one time to another in school, maybe he was absent the day they talked about that?  Smile You know, if you take the speed of a .45Cal. bullet in FPS which is close to 700FPS and figure it into MPH you should come close to the speed of a fast jetliner with a fair tail wind? Max.

User currently offlineIainhol From , joined Dec 1969, posts, RR:
Reply 15, posted (13 years 7 months 4 weeks 1 day 13 hours ago) and read 1707 times:

I think his problem is US public school!
Iain


User currently offlineStallspeed From , joined Dec 1969, posts, RR:
Reply 16, posted (13 years 7 months 4 weeks 1 day 12 hours ago) and read 1705 times:

It's the new math Max. It doesn't matter what the answer is as long as you feel good about it.  Nuts

User currently offlineMax Power From , joined Dec 1969, posts, RR:
Reply 17, posted (13 years 7 months 4 weeks 1 day 11 hours ago) and read 1700 times:

Amen to that.

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