LF Thoughts on Propeller design

[zenrat]

Do wind turbines count as propellers?

[Dizzyfugu]

Yes. IMHO, they just work "the other way around".

[Pellson]

Do wind turbines count as propellers?

They do, and as tip speed is ultra important to efficiency, you will notice that the larger the rotor/propeller, the slower the rpm.

[PR19_Kit]

They're a very funny shape too, lots of section and pitch angle changes along their length. But then they're operating at relatively slow airspeeds compared to aircraft props.

I installed a test rig for wind turbine blades up at Blyth in the NE, and those things are GINORMOUS! The test sample was so big you could walk much of way down it INSIDE the blade! It was mounted horizontally BTW.

They'd installed lights hanging from the 'roof', the blade's leading edge, and maybe half way down it they'd got a kitchen table and a couple of chairs with a coffee machine and a kettle! 

You would NOT have wanted to be in there while our test rig was doing its thing though, that could get very scary! 

[Rick Lowe]

*To throw a moggie in amongst the feathered rats, what size were the Soviet props on their hovercraft? 

Knowing the way they think, I expect they would be 19 ft 1" dia. but they missed out on that bit, they were actually smaller. The hovercraft themselves were just INCHES longer than an SRN4 Mk III though.

'Ner, ner, ner, our are bigger than yours'....

Just kids really.

Which is why when the Soviet's standard tank gun was a 100mm, NATO went with a 105... or so the story goes.   
Then the Soviets upgunned to 115...

[Wardukw]

*To throw a moggie in amongst the feathered rats, what size were the Soviet props on their hovercraft? 

Knowing the way they think, I expect they would be 19 ft 1" dia. but they missed out on that bit, they were actually smaller. The hovercraft themselves were just INCHES longer than an SRN4 Mk III though.

'Ner, ner, ner, our are bigger than yours'....

Just kids really.

Which is why when the Soviet's standard tank gun was a 100mm, NATO went with a 105... or so the story goes.   
Then the Soviets upgunned to 115...

Hahaha 😆...yup 😀