Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

Formula to calculate speed??

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Old 06-13-2003, 06:41 PM
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patriot21
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Default Formula to calculate speed??

is there such a formula that calculates the mph by timing the plane's feet per second
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Old 06-13-2003, 07:32 PM
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ChuckAuger
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Default Formula to calculate speed??

FPS/ 1.46666= MPH

For a great utility that converts basically anything to anything, go here: http://www.5bears.com/filedown.htm and scroll to the bottom of the page and download the Convert utility. It's just as neat as can be!
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Old 06-13-2003, 10:11 PM
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Cyclic Hardover
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Default Formula to calculate speed??

Here is what I use. You can change some of the numbers around to fit

Lets say I fly a 700ft runway in 5 seconds. it goes like this.

700ft div by 5 sec = 140ft per.sec. 140 x 60=8400. 8400 x 60=50400. Take the 50400 div by 5280 = 95.45 mph. its a very simple thing that works fine

700 div 5 = 140 x 60 x 60 div 5280 = 95mph
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Old 06-14-2003, 01:00 AM
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ChuckAuger
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Default Formula to calculate speed??

Originally posted by Cyclic Hardover
Here is what I use. You can change some of the numbers around to fit

Lets say I fly a 700ft runway in 5 seconds. it goes like this.

700ft div by 5 sec = 140ft per.sec. 140 x 60=8400. 8400 x 60=50400. Take the 50400 div by 5280 = 95.45 mph. its a very simple thing that works fine

700 div 5 = 140 x 60 x 60 div 5280 = 95mph
Yeah, that's pretty simple...

Or you could just take the 140 FPS and divide by 1.4666 and get 95.45MPH. Of course you miss out on several steps,

140/1.4666= 95.45
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Old 06-14-2003, 01:25 AM
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Default Formula to calculate speed??

Thanks Chuck Auger!

Very Cool... A lot more uses than simply Aero Modeling.

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Old 06-15-2003, 01:57 AM
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Cyclic Hardover
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Default Formula to calculate speed??

Boy can we help or what!
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