Bryan Becker
Topic Author
Posts: 327
Joined: Fri Mar 02, 2001 12:38 pm

Fps To Mph

Fri Apr 27, 2001 6:54 am

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
 
sabenapilot
Posts: 2442
Joined: Sat Feb 26, 2000 6:18 pm

RE: Fps To Mph

Fri Apr 27, 2001 7:03 am

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.

 
sabenapilot
Posts: 2442
Joined: Sat Feb 26, 2000 6:18 pm

RE: Fps To Mph

Fri Apr 27, 2001 7:16 am

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.
 
prebennorholm
Posts: 6447
Joined: Tue Mar 21, 2000 6:25 am

RE: Fps To Mph

Fri Apr 27, 2001 7:30 am

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
 
prebennorholm
Posts: 6447
Joined: Tue Mar 21, 2000 6:25 am

RE: Fps To Mph

Fri Apr 27, 2001 8:02 am

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
 
USAFHummer
Posts: 10261
Joined: Thu May 18, 2000 12:22 pm

RE: Fps To Mph

Fri Apr 27, 2001 8:25 am

Preben,

FYI a statute mile is 5280 ft.

Greg
Chief A.net college football stadium self-pic guru
 
prebennorholm
Posts: 6447
Joined: Tue Mar 21, 2000 6:25 am

RE: Fps To Mph

Fri Apr 27, 2001 8:47 am

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
 
Bryan Becker
Topic Author
Posts: 327
Joined: Fri Mar 02, 2001 12:38 pm

RE: Sabenapilot

Fri Apr 27, 2001 10:36 am

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

Thanks for your post anyway Smile



-BryanBecker Big thumbs up
 
JG
Posts: 165
Joined: Tue Jun 07, 2005 1:53 am

RE: Sabenapilot

Fri Apr 27, 2001 8:58 pm

Yes they do Bryan
 
Jetpilot500
Posts: 78
Joined: Wed Nov 29, 2000 1:54 am

RE: Sabenapilot

Fri Apr 27, 2001 10:39 pm

Its called basic algebra.
 
flight152
Posts: 3221
Joined: Fri Nov 24, 2000 8:04 am

RE: Fps To Mph

Sat Apr 28, 2001 5:06 am

Yes they do, I'm in 10th grade and I've done that like a year ago.
 
flight152
Posts: 3221
Joined: Fri Nov 24, 2000 8:04 am

RE: Fps To Mph

Sat Apr 28, 2001 6:28 am

Did you drop out of school?
 
Bryan Becker
Topic Author
Posts: 327
Joined: Fri Mar 02, 2001 12:38 pm

RE: Fps To Mph

Sat Apr 28, 2001 7:58 am

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
 
Guest

RE: Fps To Mph

Sun Apr 29, 2001 3:41 am

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

RE: Fps To Mph

Sun Apr 29, 2001 5:58 am

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.
 
Guest

RE: Fps To Mph

Sun Apr 29, 2001 6:46 am

I think his problem is US public school!
Iain
 
Guest

RE: Max Power

Sun Apr 29, 2001 7:45 am

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

Stallspeed

Sun Apr 29, 2001 9:16 am

Amen to that.

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