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redpoint5 · 09-25-2018, 04:18 AM

I didn't know the math, but considered that too. I figured the circumference grows at 2(pi)r, but the swept area increases at (pi)r^2, so the area increases more rapidly than the blade tip speed increases. But then, lift isn't equal throughout the swept area because the portion of the blade nearest to the rotor moves at a slower speed and produces less lift, while the portion of the blade towards the tip produces more lift.

I wonder if a lighter than air ship (blimp) would be more efficient?

https://en.wikipedia.org/wiki/High-a...atform_station

09-25-2018, 04:18 AM	#12 (permalink)
redpoint5 Human Environmentalist Join Date: Aug 2010 Location: Oregon Posts: 12,456 Acura TSX - '06 Acura TSX 90 day: 24.19 mpg (US) Lafawnda - CBR600 - '01 Honda CBR600 F4i 90 day: 47.32 mpg (US) Big Yeller - Dodge/Cummins - '98 Dodge Ram 2500 base 90 day: 21.82 mpg (US) Mazda CX-5 - '17 Mazda CX-5 Touring 90 day: 26.68 mpg (US) Chevy ZR-2 - '03 Chevrolet S10 ZR2 90 day: 17.14 mpg (US) Model Y - '24 Tesla Y LR AWD Thanks: 4,211 Thanked 4,390 Times in 3,364 Posts	I didn't know the math, but considered that too. I figured the circumference grows at 2(pi)r, but the swept area increases at (pi)r^2, so the area increases more rapidly than the blade tip speed increases. But then, lift isn't equal throughout the swept area because the portion of the blade nearest to the rotor moves at a slower speed and produces less lift, while the portion of the blade towards the tip produces more lift. I wonder if a lighter than air ship (blimp) would be more efficient? https://en.wikipedia.org/wiki/High-a...atform_station __________________ Gas and Electric Vehicle Cost of Ownership Calculator Give me absolute safety, or give me death! Last edited by redpoint5; 09-25-2018 at 11:25 PM..