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

### Fps To Mph

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.  it would realy help me out.THANKS!!!!!!

-BryanBecker

sabenapilot
Posts: 2445
Joined: Sat Feb 26, 2000 6:18 pm

### RE: Fps To Mph

Hey, have you ever been to school or what?

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: 2445
Joined: Sat Feb 26, 2000 6:18 pm

### RE: Fps To Mph

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: 6570
Joined: Tue Mar 21, 2000 6:25 am

### RE: Fps To Mph

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.

Best regards, Preben Norholm
Always keep your number of landings equal to your number of take-offs

prebennorholm
Posts: 6570
Joined: Tue Mar 21, 2000 6:25 am

### RE: Fps To Mph

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

Preben,

FYI a statute mile is 5280 ft.

Greg
Chief A.net college football stadium self-pic guru

prebennorholm
Posts: 6570
Joined: Tue Mar 21, 2000 6:25 am

### RE: Fps To Mph

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

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

-BryanBecker

JG
Posts: 165
Joined: Tue Jun 07, 2005 1:53 am

### RE: Sabenapilot

Yes they do Bryan

Jetpilot500
Posts: 78
Joined: Wed Nov 29, 2000 1:54 am

### RE: Sabenapilot

Its called basic algebra.

flight152
Posts: 3259
Joined: Fri Nov 24, 2000 8:04 am

### RE: Fps To Mph

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

flight152
Posts: 3259
Joined: Fri Nov 24, 2000 8:04 am

### RE: Fps To Mph

Did you drop out of school?

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

### RE: Fps To Mph

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!!!!!!!

-Bryanbecker

Guest

### RE: Fps To Mph

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

Guest

### RE: Fps To Mph

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?   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

I think his problem is US public school!
Iain

Guest

### RE: Max Power

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

Guest

Amen to that.

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