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I've calculated the 'recommended' relation between KV and prop diam here: http://bit.ly/1gmDQ3E

In addition you have a 550mm diameter frame and its a hexacopter right? so whats left: - motors (KV) - props (diam and pitch) - AUW. (your second link is partially broken, I can get it to work but not by clicking on it.)

other reasons might be either too large props or too high pitch or both. The higher these numbers are the less stable the flight becomes. btw. noob here as well: what are 'gains' ? I know they're amplifiers but the only 'amplifiers' I know to be on a rig are the ESC's. So what are the 'gains'?

ok I've added an extra note explaining that the wheelbase - prop.diam. relation that this tool calculates is NOT the recommended size but the "mathematically possible" size.

Hi, I see what you mean and I have to agree. Funny thing is though, in the 'new posts' your post was very close to this one: http://www.multirotorforums.com/showthread.php?17865-Bad-FC&p=154152#post154152 which obviously made me wonder whether that post triggered your post? (the drop that made...

Your OP is a bit misleading. Most readers thus read it the wrong way. Let me give another way of saying what you say (and pls correct me if I'm wrong, cause maybe *I'm* the one gotting it wrong :D). "When you connect an esc/motor to channel 3 of your FC the motor runs. When you connect that...

Funny I'm looking for exactly the same thing for exactly the same reason. I'm not finished yet, but here's what I got so far: http://www.multirotorforums.com/showthread.php?17711-New-build-F550-including-explanations I would let the notion of flying it near kids go though as by now I realise...

That explains a lot. Thanks.

I had hoped to keep my questions limited to one thread and occasionaly ask one there, but unfortunately that does work as people will go back to the OP. So new thread for new question. I was reading this: http://www.jethobby.com.sg/cgi-bin/e...=show&pid=3371 and came accross this: Supported...

here's a calculator I created specifically for that issue: http://bit.ly/1gmDQ3E

Ah ok theres the misconception. I don't recommend a prop diam based on wheelbase. I tell you where the physical limits lie, that's not a recommendation. I do give the recommendation between motor KV and diam but not between wb and diam. I'll try to update the tool to clarify.

thank you. I don't however know what your getting at as i don't give any relation between wheelbase and motor KV. I could add that if you can provide me with sensible data, e.g. a table with a couple of wheelbasis and their suggested motorsizes. The only thing im currently doing is suggesting...

ok done! I've added two more calculators so you can calculate each variable depending on another.

Yeah that's also possible. That's simply reversing the formula. Basically you could start with any of the three: motors,props or frame and derive the max. For the other two from that yes. I'll have a look.

that makes more sense. that would allow for 19" props (though probly cutting it too close). note I wrote this to calculate it automatically: http://bit.ly/1gmDQ3E

Q4. Next question: I was reading this: http://www.jethobby.com.sg/cgi-bin/ezsite/prod/manager.cgi?action=show&pid=3371 and came accross this: Supported Multi-rotor: Quad-rotor I4, X4; Hex-rotor I6, X6, IY6, Y6; Octo-rotor I8，V8，X8 I'm gathering different configurations, but what do they mean?

new here as well, so i started to accumulate my learnings here; my first attempt at gathering parts and getting a grasp: http://www.multirotorforums.com/showthread.php?17711-New-build-F550-including-explanations my first tool to calculate the relation between frame, prop size and KV...

how on earth do you get 13" props on a 450 base quad? basic math: sin(45) = Rprop / Rbase --> 0.71 = Rprop / (450/2) --> Rprop = 0.71 * 225 = 159,1 mm = 6,26" --> Diam. Prop = 2*Rprop = 12.5" so 12.5" props would just touch eachother on your frame...13 inch would cut eachother up. Are these...

thanks for the kind replies linearity for larger wheelbasis: yes they do, but it was not really intended as such. Its basically twofold. 1. first determine the max size prop that the *frame* allows, always good to know when props start eating eachother. Obviously you could use different...

Disclaimer: beware I'm a beginner myself and created this out of necessity but I CAN have it wrong so recheck before you commit yourself to these numbers!!! Yes there is ecalc, but getting started if really hard if you have absolutely no inclination of where to start. This calculator works when...