Engine Fans

cessna2351 · September 3rd, 2004, 01:50

How come in most Boeing jets (others?) there are those little white spirals in the center of each fan. Are they just there because they look real cool when you look at them spinning or do they serve another purpose?

Mike McM

RiddlePilot · September 3rd, 2004, 02:01

My guess is that it's to quickly tell whether or not the blades are spinning.

flyhigh · September 3rd, 2004, 17:07

[ QUOTE ]
My guess is that it's to quickly tell whether or not the blades are spinning.

[/ QUOTE ] That's what I would also guess

JAM · September 5th, 2004, 11:08

[ QUOTE ]
My guess is that it's to quickly tell whether or not the blades are spinning.

[/ QUOTE ]

Actually, they are there to calibrate how fast the fan is spinning. A trained mechanic can see the rpms by counting the number of revolutions of the "spinner" in a minute at idle and check that against factory limitations.

[img]/ubbthreads/images/graemlins/spin2.gif[/img] [img]/ubbthreads/images/graemlins/spin2.gif[/img] [img]/ubbthreads/images/graemlins/spin2.gif[/img]

jtrain609 · September 5th, 2004, 12:23

I always thought it was designed to freak out birds so that they wouldn't go near the engines.

TrinidadGT20 · September 7th, 2004, 05:24

I agree with John. I've read a few times that the spinners are to scare away birds.

sorrygottarunway · September 7th, 2004, 11:18

or scare away "look ma" passengers

September 3rd, 2004, 01:50	#1
cessna2351 Senior Member Join Date: Jan 2004 Location: Daytona Beach/Cleveland, OH Posts: 637	Engine Fans How come in most Boeing jets (others?) there are those little white spirals in the center of each fan. Are they just there because they look real cool when you look at them spinning or do they serve another purpose? Mike McM

September 3rd, 2004, 02:01	#2
RiddlePilot Senior Member Join Date: Apr 2003 Location: Prescott, AZ Posts: 928	Re: Engine Fans My guess is that it's to quickly tell whether or not the blades are spinning.

September 3rd, 2004, 17:07	#3
flyhigh Senior Member Join Date: May 2004 Location: Boston Posts: 615	Re: Engine Fans [ QUOTE ] My guess is that it's to quickly tell whether or not the blades are spinning. [/ QUOTE ] That's what I would also guess

September 5th, 2004, 11:08	#4
JAM Junior Member Join Date: Oct 2002 Location: Florida Posts: 246	Re: Engine Fans [ QUOTE ] My guess is that it's to quickly tell whether or not the blades are spinning. [/ QUOTE ] Actually, they are there to calibrate how fast the fan is spinning. A trained mechanic can see the rpms by counting the number of revolutions of the "spinner" in a minute at idle and check that against factory limitations. [img]/ubbthreads/images/graemlins/spin2.gif[/img] [img]/ubbthreads/images/graemlins/spin2.gif[/img] [img]/ubbthreads/images/graemlins/spin2.gif[/img]

September 5th, 2004, 12:23	#5
jtrain609 Old Skool Join Date: Feb 2002 Location: Park City, UT Posts: 12,289	Re: Engine Fans I always thought it was designed to freak out birds so that they wouldn't go near the engines.

September 7th, 2004, 05:24	#6
TrinidadGT20 Old Skool Join Date: Feb 2001 Location: Red Sox Nation Posts: 1,506	Re: Engine Fans I agree with John. I've read a few times that the spinners are to scare away birds.

September 7th, 2004, 11:18	#7
sorrygottarunway Senior Member Join Date: Oct 2003 Location: DXR, Connecticut Posts: 1,169	Re: Engine Fans or scare away "look ma" passengers

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