Comments on: Hummel - helicopter - http://idealist.blinkr.net/hummel/ dreamed objects Sun, 20 Jul 2008 07:13:24 +0000 http://wordpress.org/?v=2.0.6 by: glamjets http://idealist.blinkr.net/hummel/#comment-15967 Tue, 08 Jan 2008 14:23:07 +0000 http://idealist.blinkr.net/hummel/#comment-15967 There's designing...and then there's engineering. Learn the difference. Choose one. There’s designing…and then there’s engineering.

Learn the difference. Choose one.

]]> by: Kirs http://idealist.blinkr.net/hummel/#comment-15810 Sat, 05 Jan 2008 21:28:46 +0000 http://idealist.blinkr.net/hummel/#comment-15810 It IS very similar to the V-22 Osprey....which was a big bag of fail...cool idea...it's just a lot of pressure where the center pivot stems out It IS very similar to the V-22 Osprey….which was a big bag of fail…cool idea…it’s just a lot of pressure where the center pivot stems out

]]> by: Dominic http://idealist.blinkr.net/hummel/#comment-15660 Fri, 04 Jan 2008 03:27:08 +0000 http://idealist.blinkr.net/hummel/#comment-15660 I'm afraid it will not work 'without wasting fuel' . The efficiency of a rotorcraft depends critically on its 'disc loading' that is the amount of weight carried per unit area swept by the rotors. For a given weight lifted, making the rotors half the diameter means forcing the air downward at four times the speed, which in turn means using sixteen times as much power. That's why helicopters have huge rotors, instead of small counter-rotating fans: they're inefficient enough as it is, without geometrically increasing the fuel used per tonne-km transported. Sorry: won't work, at all, and for fundamental reasons, not incidental ones. I’m afraid it will not work ‘without wasting fuel’ .

The efficiency of a rotorcraft depends critically on its ‘disc loading’ that is the amount of weight carried per unit area swept by the rotors. For a given weight lifted, making the rotors half the diameter means forcing the air downward at four times the speed, which in turn means using sixteen times as much power. That’s why helicopters have huge rotors, instead of small counter-rotating fans: they’re inefficient enough as it is, without geometrically increasing the fuel used per tonne-km transported. Sorry: won’t work, at all, and for fundamental reasons, not incidental ones.

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