Joined: 04 Nov 2008 Posts: 4718 Location: Santo Estêvão, East Algarve, Portugal. Now 82, but still feels 22.
Posted: Sun Jan 09, 2011 8:39 pm Post subject:
A typical 450-sized electric helicopter may weigh 800 grams (0.8Kg) and have a rotor diameter of 70cm (0.7m), giving a disk loading of:
0.8/(pi*(0.7/2)^2) = 2.1Kg per square meter
But my math sucks and I have no idea what that means..
OK Crash, a quick crash course
This is taking the weight of the heli (0.8Kg) and the swept area of the rotor (pi*(0.7/2)^2) in sqM. The weight is divided by the area to produce the weight per sqM on the rotor.
Without knowing what the max lift ratio is of the rotor this does not help very much in considering payload, but I do know from experiment, that on my 450 anything over 110g (4ozs) seriously effects handling, especially in ground effect when landing. My little co-axial has (for its size) a much better and safer lifting capacity.
Joined: 17 Jan 2008 Posts: 1380 Location: Redding, Northern Calif.
Posted: Tue Jan 11, 2011 1:14 pm Post subject:
You tried Tom, but sorry to say it's just not working. I think I am to old to learn this stuff. You know what's funny though is I use numbers all the time at work, by measuring and squaring things. I can tell you the center of almost any measurement off the top of my head, but the rest of my math sucks..
chopper, your idea is more the way my thinking is..
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