

Thank you!

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This is the problem with this field, there are a LOT of people giving out bad advice.  You have to learn to sort the wheat from the chaff.

What I've learned in the past 3 years is this:  If somebody gives you an answer that is really simple, and easy to understand, and makes sense, then it's probably wrong.

If somebody gives you an answer that is difficult to understand, has references to a white paper or textbook, and requires you to break out a calculator, then they probably know what they're talking about.   

Or to put it another way, answers that are black and white are usually wrong.  (ie: "Best efficiency is at 2:1 thrust/weight ratio").   If the answer is "It depends", then that answer is usually right.  Very little in this field is simple, and the answer is usually nuanced.

Sorry, I had to :)

No offense Kate :)))


And my questions are probably poorly formulated :)

Rob, I think I'm learning that more and more haha. I've been finding a lot of different explanations to the same question, so there's a lot of gray area like you say. I trust your experience though!

Haha this made me laugh. Thanks, Mathieu!


Generally speaking hexes will be less efficient than quads.  This is because quads can fit larger size propellers for any given frame size, and that is where you get efficiency (propeller area per mass).

Just draw some stick figure machines.  Draw a quad with 10" props almost touching.  Connect the motors with sticks.  The total length of those sticks will roughly represent your frame weight.

Now draw a hex with 10" props almost touching.  Connect the motors with sticks.  The total stick length is relative to what the frame weight will be.

Now for both cases, divide your disk area, but your stick length.  You'll see that the quad is higher.

I noticed this too.

In my defence, I only got involved because Bradley was posting here! :)

And... your avatar is freakin me out man!




you can calculate, pretty acurately by using,





Hi all,


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