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Old Feb 18, 2015, 07:42 PM
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Arkansas
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What is your AUW for your 680?
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Old Feb 18, 2015, 07:46 PM
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United States, FL, Melbourne
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Around 2500 grams minus the Lipos , with the gimbal, Gopro hero4 , FPV equipment, canopy, stock landing gear
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Old Feb 18, 2015, 07:47 PM
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add around 1000G for the Lipo depending on which ones I run
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Old Feb 18, 2015, 07:54 PM
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Arkansas
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So your 6 motors will have to lift 583g per motor. And the T-motor only have a lift of 645g per motor at 50%. So I would be looking at a system that could life at least 1000g plus per motor at 50% throttle. But that's up to you and I would check other folks on this forum and see what they are running.
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Old Feb 18, 2015, 08:00 PM
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Canada, QC, Blainville
Joined Aug 2009
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you dont need double thust at 50%, you need to hover at 50% throttle.
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Old Feb 18, 2015, 10:30 PM
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Yes but you also need the thrust to lift that weight at 50% also. If you had a hexa where each motors had to lift 500g and the motors would only lift 500g your time in the air would really be short that is if you could even get into the air
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Old Feb 18, 2015, 10:37 PM
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Right now I'm getting close to 15 min on 2x4S 5200mahM
Multistar lipos
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Old Feb 18, 2015, 10:49 PM
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United States, WI, Hayward
Joined Jan 2012
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It think you are a little confused. If you did not have about 583g for 50% thrust it would not be hovering. The motors have 1200g of thrust at max so they are doing exactly what you want. You don't want a craft the hovers at 20% thrust. You want it to hover at 50%, which means this would be hovering at something less than 50% already. If the craft had 1100g of thrust at 50% it would be launched into outer space at 50% throttle. 50% thrust at hover means it just overcomes the weight of the machine. So at 3000g AUW it takes 500g to cause it to float or hover.

The last thing you want is to be way over-powered and have excess weight in big motors that you never use. Right? Maybe for a 250 class rocketship but not for an AP rig.

At 3000g this needs 500g of thrust per motor to hover and it has more than that at 50% throttle. 50% throttle, not flat out. Flat out it has 1200g per motor right? So it has more than 50% in reserve.
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Last edited by mike_kelly; Feb 18, 2015 at 10:59 PM.
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