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Old Apr 18, 2011, 07:17 PM
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Question
How much AUW with rctimer 2836/11?

How much AUW can i expect from 4 Rctimer 2836/11?

I will build a quad (and maybe hexa) with these motors and wonder how much these motors can lift while still flying comfortable.
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Old Apr 18, 2011, 07:45 PM
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Fast calculation (I don't have much experience but hoping other can add or correct):
Spec says max 206W
Let say we can safely use them at 180 W (-~10%)
4 motors gives a total 720 W
With the right propeller/battery combo I think you should get at least 5g/W (I havn't seen one single chart from efficiency testing on a RC timer motor yet) -> 3600 g lift
And if I have heard right you should aim for a maximum AUW around half of maximum thrust so around 1800g but a little more may not be impossible.
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Old Apr 18, 2011, 10:41 PM
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I have a hexa using a minsoo blue kk board. Ive got those motors you mention and my hexa is on a x468 frame with aluminium U shaped tubing. I also have a home made camera mount arrangement and a small compact camera. A Lumix FH5. I have wrapped all booms in heat shrink to hide the wires and have also added pool noodles on my landing gear till I get better at landing gently everytime. Also have lights on board to. So my Hexa is a bit fatter than it needs to be. My all up weight including a 5000mah battery, camera and camera mount is 2.2kg and I get a safe 10 minutes flying out of the battery. I have got 14.5 minutes before losing power when testing. Im using APC 10 x4.7 props. Hover is at half throttle.

Hope that helps.
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Old Apr 19, 2011, 03:00 AM
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Thank you so very much for your answers. They were really helpful. I think ive got a clue now on how much weight i can put on
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Old Apr 19, 2011, 03:35 AM
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Quote:
Originally Posted by Malx View Post
I havn't seen one single chart from efficiency testing on a RC timer motor yet
Here you go flyboy.

http://aeroquad.com/showthread.php?1...ll=1#post17606
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Old Apr 19, 2011, 06:20 AM
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Quote:
Originally Posted by tori3 View Post
Big thanks! I have been waiting for someone testing that one (and the BC3536). To bad you didn't have the instruments to go above 100W, it's nice to know where the limit are when the efficiency starting to drop significantly.

Could you please pm me the raw data from the test? I would like to use it in my calculations for my coming Y6 to see if I can use 2836 or need to go to 3536.

Edit: The drop in efficiency seems to be quite linear (the other graphs are not). From about 9g/W to just below 7g/W at 100W. That would mean that 5g/W at 180W is not that bad as approximation.
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Last edited by Malx; Apr 19, 2011 at 06:30 AM. Reason: Added some notes about the graphs
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Old Apr 19, 2011, 09:40 AM
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PM dispatched.

Yes, it looks suspiciously linear and 5 g/W (200 W/kg) sounds realistic. Although an appropriately scaled quad (2ish kg, 500 g per motor) will never reach these thrust levels in continuous flight.
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