Replies to This Discussion

Permalink Reply by Greg Fletcher on March 28, 2011 at 8:27pm

What is possible now.

Big copter

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Permalink Reply by Coby on March 29, 2011 at 12:42pm

Bill,

I am on a Mac so I use Drive Calculator to give me some rough numbers.  I believe most on the PC side use MotoCalc.  http://www.motocalc.com/motodown.htm  But that probably won't help you much for your design.

 

I would be curious to hear what payload requirements you have that are driving that weight.  Most of those doing "Heavy Lift" multi's are carrying full sized dSLR's etc.  So it's not out of the question to carry around 10lbs with the current commodity stuff.  And it will scale further but I don't think most people have the need.

 

http://quadrocopter.3dcartstores.com/AD-4-Heavy-Lift-V2_p_121.html

 

I would suggest running some numbers through MotoCalc with the motors they list as options.  Play with numbers of lipo cells and prop size to get a feel for what's possible.  As other posters have alluded to, this is all pretty new to all of us (relative to R/C in general) so there is a bunch of trial/error going on.

 

You just touched on the need to rewrite code yourself.  You are also introducing more variables by using an air breathing engine, which will be subject to performance issues at different density altitudes.  In an all electric set-ups I am subject to density altitude impacts on the rotor system but not the motor.

 

So, there are many reasons why those working on multi-copters have gone with direct drive electrics.

 

 

 

 

 

 

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Permalink Reply by Russell B. Sutton on April 13, 2011 at 1:37am

I have been designing a QaudCopter that will be large enough for an adult to ride. Electric brushless motors are the way to go due to their preformace. The only problem I'm having is that battery technology is not up to par yet. My design does use batteries for emergency landings. My design uses a APU (Auxiliary Power Unit ) form a small private jet to Supply power to run the electric motors. Hope this helps

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