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Old Dec 26, 2011, 07:05 PM
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Joined Nov 2007
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Help!
really need your help

hey guys
I seriously need your help
I'm at critical stage in my quad build.
i need to know what motor and ESC and prop to get.
this is what i'v got so far

frame=400 Grams (square aluminum 25 inches motor to motor)
camera=225 Grams
battery=170 Grams 2200 / 3s / 12c (they're pretty old so i could buy some new ones)
receiver=12 Grams (AR6200) with DX6i
total 800 Grams + or - a few Grams without motors
Any input will be appreciated

Henri
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Old Dec 26, 2011, 07:22 PM
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Hawaii
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Quote:
Originally Posted by keya View Post
hey guys
I seriously need your help
I'm at critical stage in my quad build.
i need to know what motor and ESC and prop to get.
this is what i'v got so far

frame=400 Grams (square aluminum 25 inches motor to motor)
camera=225 Grams
battery=170 Grams 2200 / 3s / 12c (they're pretty old so i could buy some new ones)
receiver=12 Grams (AR6200) with DX6i
total 800 Grams + or - a few Grams without motors
Any input will be appreciated

Henri
You can probably use some 180 watts motor with 900 kV and 10" X 4.7" propellers. I will definitely get some new batteries because your frame is really heavy. If you can lighten the frame then you are much better off. Typically for that payload you want your frame to be around 200 grams.

You next best bet is to use more powerful 200 watts motors with 800 kV and 11" X 4.7" props. That is really a waste to haul up just a 225 grams camera. Unfortunately again your frame is taking up a lot of your payload weight.
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Old Dec 26, 2011, 07:33 PM
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These topics might help you: showthread.php?t=1388583 - showthread.php?t=1557506
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Old Dec 26, 2011, 08:41 PM
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what do you think about these motors http://www.hobbyking.com/hobbyking/s...dProduct=14397

do you think it would have enough power to lift my quad?
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Old Dec 26, 2011, 08:52 PM
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Those motors are a tinny bit on the big side, but you are lifting a LOT of extra weight. What camera are you lifting? 225g is heavier than a gopro.

Your flight times are not going to be exceptionally long.

Old 12C battery's are NOT going to cut it, order some better battery's in the 20-30c range min.
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Old Dec 26, 2011, 08:54 PM
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I use this motor, it's quite good, cheap and strong (4mm shaft).
WOT it lifts around 950g with a 10x4.7 APC and it uses 2A at 200g.
Largely enough for your project.
Look here: http://www.rcgroups.com/forums/showt...1388583&page=4
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Old Dec 26, 2011, 08:58 PM
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lets say i get this motor and some new battery and 10x4.7
what kind of flight time could i expect?

BTW thanks for your help....its greatly appreciated

Henri
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Old Dec 26, 2011, 09:10 PM
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Flight time depends of your piloting.
I think around 10' for AP hover at 800g with a 2200mAh battery and much less for acro.
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Old Dec 26, 2011, 09:23 PM
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is there any other way of increasing my flight time
using my current frame. for ex. bigger battery?
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Old Dec 26, 2011, 09:27 PM
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He is at 800g without motors 280g, ESC's 60g, props/wire/connectors 40g

Im guessing 1200 flying.
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Old Dec 26, 2011, 09:29 PM
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Quote:
Originally Posted by keya View Post
is there any other way of increasing my flight time
using my current frame. for ex. bigger battery?
Bigger battery is more weight to lift. If you double the battery size, you might get 60-70% more flight time. But it will fly "heavy".
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Old Dec 26, 2011, 09:33 PM
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what would you do in my position
i really like my frame so in your honest opinion
what would do?


thanks
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Old Dec 26, 2011, 09:40 PM
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You could save 130g by using a gopro and shorten the arms a little. Thats about it. Or build a new frame, with thinner wall arms.
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Old Dec 26, 2011, 09:42 PM
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what about ESC
would you go with plush 20A or 30A
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Old Dec 26, 2011, 10:06 PM
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Me? Well, the real weight saving come when you get down below 18a esc's, like 12a or 10a. If I had to chose between 20 or 30, I would take the 30's ONLY because they are only 2g heavier and a $1.50 more.
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