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HelicopterMain Discussion › Why Do Blades Frdt??????????Brapppt
08-01-2013 03:50 PM  4 years agoPost 1
icanfly

rrElite Veteran

ontario

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HUh?

Solve the riddle, win a prize.

Yea, like maybe it's IP worth ripping off, sure, always happens, the little guy looses. Detect something here? Maybe the puzzle has been solved. But you first sir, please and thank you.

Really.
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(fyi, my lineage is tied to central Europe, not Canda. If I told you how rotten my neighbors are, well, that's another novel. It's one thing to be a millionaire in cash, it's another to be one with a mother load of talent worth a few dimes. Viva Liberty)

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08-01-2013 05:58 PM  4 years agoPost 2
RCHSF

rrKey Veteran

NC

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Why Do Blades Fart??????????Brapppt
Something to do with heavy thumb on gass pedal, and I think gravity and weight have something to do with it.

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08-01-2013 06:51 PM  4 years agoPost 3
stubbs

rrApprentice

Tuscon, AZ

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Simple. They "fart" because the advancing blade tip smacks through the turbulent air created by the blade tip in front of it.

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08-01-2013 08:32 PM  4 years agoPost 4
smj

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cambridgeshire uk

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"All people have the right to stupidity but some abuse the privilege."

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08-01-2013 08:44 PM  4 years agoPost 5
teamdavey2001

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Sunnyvale, California, USA

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Because they injest too much fibre

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08-01-2013 09:13 PM  4 years agoPost 6
icanfly

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ontario

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Ask a silly q. I've actually heard my blades bark. Quite incredible how heli blades oscillate and smack the air, and at sub sonic levels, absolutely amazing.

My blades are humming now due to a mod, and there was a time I got a deliberate hum from a coax. Hummed all the time after a simple mod, once again.

I'm messing with bizness on these things, fun fun fun, WOW. In so doing there are new things to be learned. I've conceptualized a gear noise canceling device soon to be experimented with, hobby remember.

Here's an experiment, take your hands and clap them very slowly, faster, then faster until they begin to make the familiar clap pop. What that is is air pushing out between your hands at near sonic speeds, then at the speed of sound colliding and leaving a shock wave into the surrounding air around your hands. Do it just fast enough to induce a hum, clue.

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08-01-2013 10:46 PM  4 years agoPost 7
FlyAway02

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Jasper, Indiana USA

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What would happen if you put 4mm blades on a 700 size heli????

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08-02-2013 12:46 AM  4 years agoPost 8
dkshema

rrMaster

Cedar Rapids, IA

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What would happen if you put 4mm blades on a 700 size heli????
People would laugh at you.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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08-02-2013 12:52 AM  4 years agoPost 9
D.Magee

rrKey Veteran

kansas city mo.

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They fart because they haft to.

Teameagles@HaveFun

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08-02-2013 01:26 AM  4 years agoPost 10
RCHSF

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NC

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FlyAway02

What would happen if you put 4mm blades on a 700 size heli????
In short order you be doing a pretty wicked piro for a min, till the engine blows. If E then you be about in same boat.

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08-02-2013 03:01 AM  4 years agoPost 11
cudaboy_71

rrElite Veteran

sacramento, ca, u.s.

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What would happen if you put 4mm blades on a 700 size heli????
knowing me, i'd spend 20 minutes trying to figure out how to get my bladeholder on.

if it ain't broke, break it.

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08-02-2013 03:11 AM  4 years agoPost 12
icanfly

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ontario

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put 4mm blades on a 700
it would shyt its electronics out.

why 4mm? What does it do to make a sound? Hardly anything there to make much of. You actually don't know what it is you've said, but it is relevant.

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08-02-2013 03:16 AM  4 years agoPost 13
RCHSF

rrKey Veteran

NC

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A good Carrot Chopper.

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08-02-2013 04:14 AM  4 years agoPost 14
FlyAway02

rrApprentice

Jasper, Indiana USA

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a good carrot chopper
You, good sir. Just made my day!

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08-02-2013 04:14 AM  4 years agoPost 15
RappyTappy

rrProfessor

North Denver, Colorado

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I believe the fart sound is because they are exceeding the angle of attack for the airfoil in a agressive manuever and stalling out. The turbulence of the air and the blades literally thumping the air creates the sound. A awesome sound I may add, lol

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08-02-2013 11:39 AM  4 years agoPost 16
icanfly

rrElite Veteran

ontario

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this things cool aye,

http://gizmodo.com/5804090/this-may...he-osama-attack
G.I. Joe & Cobra were way ahead of their time.
re Cobra Mamba, hehe

Turbines make em, Blade wake interaction.

Quite the phenomena, can destroy turbine fins, compressor impellers, hmm, stability problems, bad vibes.

Good times.

what you hear can best be described as a low pressure bubble created at a preceding blade tip being popped by the following blade pass through it, and/or, the updraft of the preceding blade colliding with the following blade as it pushes down to create lift, smack.

doesn't happen in hover, only echos when approaching.

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