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HelicopterOff Topics › How fast are your blade tips
10-18-2004 08:43 PM  13 years agoPost 1
craneyum

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warwickshire uk

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Rotor diameter
times
3.142 =blade circumference
times
headspeed = blade travel in mm per minute
devided by
1000 =meters per minute
times
60 = meters per hour
devided by
1000 = kph
devided by 1.6093 = mph

Is this equasion correct
Nigel

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10-18-2004 08:49 PM  13 years agoPost 2
cwhover

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El Paso, TX

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Yep, looks right to me, except the first part is circumference, not area, which is the correct value.

Carl
VISA field rep

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10-18-2004 08:52 PM  13 years agoPost 3
craneyum

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warwickshire uk

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Thats what it says doesn't it lol

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10-18-2004 08:53 PM  13 years agoPost 4
Davo

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London, UK

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Rotor diameter times 3.142 =blade area
Think you mean circumference. I think the rest is correct, but there is an easier equation.

v=r(omega) where v is the linear velocity and r is the radius.

omega is in radians per second, and you can get from rpm to rad/sec by multiplying by 2(pi)/60.

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10-18-2004 08:54 PM  13 years agoPost 5
Davo

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London, UK

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Oops, too slow.

You have to be quick off the mark round here!!!

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10-18-2004 09:24 PM  13 years agoPost 6
garth2

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nuneaton​warwickshire england

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so my evo 50 blade tips are going at about 290 mph "OUCH that would hurt"

Shut it Davo you smart arse

Lee

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10-18-2004 09:40 PM  13 years agoPost 7
Adam Crane

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Warwickshire uk

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My blades go at 292mph wow thats fast.

Sponsored By ~ Mikado ~Revolution Models~NHP Blades~Team Flight Power /Flight Tech

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10-18-2004 10:00 PM  13 years agoPost 8
gamedemon3000

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Goose Bay,​Newfoundland &​Labrador, Canada

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287mph

Derek O'B

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10-18-2004 10:28 PM  13 years agoPost 9
jerrythercpilot

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--South Florida --

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Hey haven't you ever heard of "Factor-Label" Method. That is if you put the units in the equation the numerators must cancel the denominators until you end up with what you want (Km per Hr or Miles per Hour).
for example:

RPM*(Pi(3.14159)* Diameter(meters)* (1km/1000meters)*(60min/hr)=

Meters cancel meters, mins cancel minutes, and you left with KM/hr

(1800*3.14159* 1.3M/1000)*60=441 KM/Hr or approc 275 mph so your equation is correct.

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10-19-2004 12:23 AM  13 years agoPost 10
craneyum

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warwickshire uk

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Yamaguchi's blades must run at an amaizing 388 mph
Nigel

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