Aerodynamics

Elkin · Guest

Know why golf balls have those dimples? What they really do? Know why the ball slices or hooks!! Aerodynamically I mean?

RadarMan · Posted: Fri Sep 10, 2004 3:15 pm Post subject:

http://vesuvius.jsc.nasa.gov/er/seh/pg76s95.html

http://www.sciencenetlinks.com/sci_update.cfm?DocID=23

http://wings.avkids.com/Book/Sports/beginner/golf-01.html

Radar

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Elkin · Guest

MAN!!!! You,,, WHERE do you get all this stuff?

Your too cool!!

Anyway. The ball goes that way, this way,,, for the same reasons that VG's (Vortex Generator) effect a wing etc.

I can explain ifyour interisted.

If you think about it, an open face hit causes the ball to go arcing to the right ONLY after first going straight off the face then left into it's arc.

Right then!!

RadarMan · Posted: Sat Sep 11, 2004 1:58 am Post subject:

Golf, I have a natural hook (I overswing), I play Links 2003.

Radar

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Elkin · Guest

Ok smartypants, here's one for you!

The flaps on the big planes are slotted. If they were not, the wing would stall! Why?

I am just having a little fun, if you want to tell me to fugg off, that's ok!

Fire_Emblem_Master · Posted: Sun Oct 03, 2004 2:15 am Post subject:

cause they would catch too much air and slow the plane down waay too much? that and the airflow would be extremely disrupted due to such huge flaps

RadarMan · Posted: Sun Oct 03, 2004 2:19 am Post subject:

Thanks FEM it save me hunting Read

for the answer.

Radar

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Fire_Emblem_Master · Posted: Sun Oct 03, 2004 4:01 am Post subject:

I'm probably wrong though... Confused

Elkinallen · First Officer Joined: Sep 24, 2004 Posts: 446

I wish I could submit a shot.
Anyway, with the flaps and slats/le flaps fully deployed, the wing would stall HARD without the slots. The reason being is; when the air travels allllll the way from the leading edge to the trailing edge, it would slow down and separate from the wings uppersurface and the 'suction' would be lost. SO!!! The slots in the LE flaps/slats and TE flaps have slots. These slots allow the air to ZOOOOooom!! big time through them. This increases the airs velocity. Bernoulli- 'The higher the velocity of a fluid, the lower it's pressure'.

Wow!!! too much, I know. I'll try to post a pic.

Steeev · Trainee Joined: Jul 29, 2004 Posts: 67 Location: London

Are you my old physics teacher???
He was called Allen.
We could get him to explain how a fish could explode in a lift and other great stuff. Failed our A-Levels, though. Confused

Elkinallen · First Officer Joined: Sep 24, 2004 Posts: 446

NO! But I am an advanced flight Instructor. I took extra steps to know about aerodynamics; why golf balls go that way, why slots, vortex generators,,,, work.

Want to see something neet? What do you think would happen if you turned on the kitchen faucet about half way, and the held a spoon by the tip to where it is dangling with the curved part down and towards the running water,, now slowly back the spoon into the water flow. Then increase the water flow!!!!

This is fluid dynamics!!!! Cool Hmm?!

Steeev · Trainee Joined: Jul 29, 2004 Posts: 67 Location: London

That is cool.
Does the opposite of what you think it should - and I'm a qualified chemical engineer! (poorly qualified). Explains in simple terms what keeps these beasts in the air.
See. Fizziks can be fun!

Elkinallen · First Officer Joined: Sep 24, 2004 Posts: 446

You are right. It all seems to do the opposite.

If you hold the ailerons straight!! and you deflect the rudder, will the airplane turn? Do not try to counter the rudder input by moving the ailerons. So, If you hold the control straight, and deflect the rudder, will the aircraft actually turn? Or will it only yaw?

Can an airplane turn with only a rudder? Does an airplane have to have ailerons?

Fire_Emblem_Master · Posted: Tue Oct 12, 2004 2:44 am Post subject:

Yes and no, It can turn, just not much, and it does bank when you apply rudder. It would make a wide turn, and it would slowly hook around because you are changing the direction of the engine thrust when you yaw left and right

Elkinallen · First Officer Joined: Sep 24, 2004 Posts: 446

The engine thrust redirection is very negligible. If you kepp the wings level while deflectin the rudder, the aircraft will not turn. I made a mistake describing it in the last post. You must counter the rudder induced bank with control input to keep the wings level. Turn is a funtion of,,,, well. If you hold the control fast in it's place and deflect the rudder, the wing that shifts forward gains speed and therefore more lift through velocity, thewing lifts, banking the aircraft, redirecting the verticle component of lift to the side. Like redirecting rocket thrust. Secret

this is a BIG secret!!!! Don't tell anyone!!!

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