Helicopters R Us

What you talkin about.

Now yer just funnin' me

Fookame I wish that I had a better answer than what it is that I'm going to come up with here.

It all boils down to surface area.

Helicopters that have lots of blades will typically have thin blades, often shorter. Other machines will have fewer blades, but they will be fatter, and sometimes longer. Seems kind of simple, but it's not,

The rotation speed also comes into play, obviously the faster a blade spins the more lift it will create, 'till you have to start flying it forward. So say that the tip speed of a blade it 500 mph, and you want to fly 150 mph. This is where you run into problems.
The advancing blade is at a relative airspeed of 650 mph, getting close to the speed of sound, while the retreating blade is at 350 mph and getting close to stalling at the root (where it's going slower)
So slow the rotor system, but that doesn't help with the retreating stall.
So speed it up, that doesn't help with the advancing blade compressibility stall.

Again

I was on a Bell 214 B1 as a cojo, seat meat, low time kind of guy. The thing had two blades that were 33 inches wide and rotated at a stupidly slow rpm. But my god did that thing lift, and went like a bat out of hell too.

PUI aerodynamics.

Never.....

Are you helping???

You young kids missed out on the adventure.

Vardy and I however......



Ahhhhhhhh..... those were the days.

Ya whatever. and look who's in the right seat.

I get it, medical has a bigger budget than PD so they get more blades

Sometimes WeirD is just too wordy.

Early model Bell 47.

This is a Hiller. :uhhuh



G' night kids.

Some stills are posted HERE



official website, more shots / videos HERE

At the top you can see download video........... very cool

Thanks for the links Tree cool pics.

This is a AS355 the twin engine version of the A-Star.
Me drooling all over the console

Thanks.

indeed - me too! that is just awesome! this thread won't quit!!!

Hey...where did you find our old Twinstar???

This is a AS355 the twin engine version of the A-Star.
Me drooling all over the console
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Interesting asside for anyone that left BYOB early Sunday AM. Riding up the valley north out of Petersburg on 220 when we heard this strange noise. It finally passed us overhead - an Alouette flying north, definately a strange thing to see on a Sunday AM in WV.

Any ideas on what it is.

Was it a II,



or a III.



Maybe it was a Lama. :rabia

Tail boom was covered like the III, and it was definately a frenchy, I could see the engine and exhaust from the side as it went by, she was low and hauling ass.