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Old Feb 24, 2012, 05:47 AM
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Another confused noob needs help please.

Have spent days reading on here about setups and such but still have questions. Can some explain the 450, 550 and so on dimensions to me. Wanting to build my own frame to better understand the stability aspect. Is there such a thing as too large. Also need help with motor selection. Brushless motor stats are one thing that have always remained greek to me. To me there is no need spending top dollar for just starting out but also dont want to scrape the bottom of the barrel either and end up with a piece of trash that will be frustrating to fly. Looking at it from the if you fail to plan you plan to fail aspect. Here is what i have in mind and have purchased so far.

30 inch width for stability Is this overkill?

For controll board I have purchased this one from hobby king.http://www.hobbyking.com/hobbyking/s...dProduct=21977

Esc's http://www.ebay.com/itm/270918061984...84.m1439.l2649

Power distribution board http://www.ebay.com/itm/130623898719...84.m1439.l2649 I purchased 5 of these so if anyone would like one pre wired for quad, hex or octo let me know.

The battery I have in mind is this one. http://www.hobbyking.com/hobbyking/s...arehouse_.html

What am I missing, forgetting, too blind to see?
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Old Feb 24, 2012, 06:15 AM
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450 usually means a 450mm width from motor shaft to motor shaft for a quadcopter.

I assume your building a quad? 30 inch (76cm) is very big for a quad. A 60cm quad would be considered big.
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Old Feb 24, 2012, 06:23 AM
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Yep quad.
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Old Feb 24, 2012, 07:02 AM
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45cm quad is a good starting size. Do some research on those ESCs as not all of them work well for multi rotor. Best to copy a proven setup.
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Old Feb 24, 2012, 07:17 AM
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if youre looking to get parts from ebay I would suggest finding a combo deal on ESC and outrunner
I wound up saving about 10 dollars getting a combo while still getting the outrunners and better ESCs

I am looking at getting the Aeolian 12KV outrunners with Skywing 30A ESCs for my quad
http://cgi.ebay.com/ws/eBayISAPI.dll...m=320842237920

anyone ever used either of these?
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Old Feb 24, 2012, 07:36 AM
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30A escs for a quad - 30A x 12V x 4 motors = 1440 watts for something that would weigh 1-1.5 kg!!! Are you trying to set some speed records or something?
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Old Feb 24, 2012, 07:42 AM
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no, its just what came in the combo
the motors say they can peak at 25A so 30A ESCs would give me wiggle room if I ever do decide to start getting acrobatic with it

this way I can also make it a bit heavier when building the frame

the cheapest ESC and outrunner combo deal on the bay comes in at 16$ and has 30A ESCs and 1000KV motors

what would you suggest?
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Old Feb 24, 2012, 08:04 AM
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Originally Posted by yashmack View Post
no, its just what came in the combo
the motors say they can peak at 25A so 30A ESCs would give me wiggle room if I ever do decide to start getting acrobatic with it
You should first decide if you want an aerobatic quad or a docile trainer. The 30" size may be fine for a trainer, but if aerobatics are your goal then you should consider a much smaller frame.

You shouldn't look at motor peak to determine your ESC size, look at what that particular motor pulls on the prop you plan on using. Quads use low pitch props, typically 8x4.7 or 10x4.7. If a motor is rated for 30a on a 12x8 prop you're never going to come close to that running typical quad props. Keep your ESCs down to the size you need, oversized ESCs = more weight which negatively impacts the flight envelope. Also I'm no expert on different ESC brands when it comes to quads, but from what I've read it sounds like some ESCs work with FC's just fine while others don't. I'd suggest making sure that whatever ESCs you select have been proven to work with the FC you're planning on using.

EDIT to add- I just checked your link and wow, those are some heavy ESCs!! 28 grams each! I wouldn't use those.
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Old Feb 24, 2012, 09:39 AM
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What I find unacceptable concerning this ESC is this: "Auto Low battery Slow down at 3.0V/cell Lipo, cut-off at 2.9V/cell Lipo"
Not good.
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Old Feb 24, 2012, 09:48 AM
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Do I need to start another thread to find the answers to my questions? Sigh
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Old Feb 24, 2012, 10:06 AM
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I do have to say you have chosen one heck of a battery
That should provide plenty of power and flight time
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Old Feb 24, 2012, 10:53 AM
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I do have to say you have chosen one heck of a battery
That should provide plenty of power and flight time
yet i would of gone with TWO of these instead?

http://www.hobbyking.com/hobbyking/s...idproduct=8851

then some clever clogs would say "but look at the amp draw of those motors and esc's" and i would say yep use this motor

http://www.hobbyking.com/hobbyking/s...idproduct=6246

and this esc if you really think you need 30a esc's

http://www.hobbyking.com/hobbyking/s...dproduct=15205

but i would max out at a 20a esc like this one myself

http://www.hobbyking.com/hobbyking/s...dproduct=13430
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Old Feb 24, 2012, 10:54 AM
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Do I need to start another thread to find the answers to my questions? Sigh
nope they were just answered
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Old Feb 24, 2012, 10:59 AM
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Originally Posted by Anarchy1 View Post
Have spent days reading on here about setups and such but still have questions. Can some explain the 450, 550 and so on dimensions to me. Wanting to build my own frame to better understand the stability aspect. Is there such a thing as too large. Also need help with motor selection. Brushless motor stats are one thing that have always remained greek to me. To me there is no need spending top dollar for just starting out but also dont want to scrape the bottom of the barrel either and end up with a piece of trash that will be frustrating to fly. Looking at it from the if you fail to plan you plan to fail aspect. Here is what i have in mind and have purchased so far.

30 inch width for stability Is this overkill?

For controll board I have purchased this one from hobby king.http://www.hobbyking.com/hobbyking/s...dProduct=21977

Esc's http://www.ebay.com/itm/270918061984...84.m1439.l2649

Power distribution board http://www.ebay.com/itm/130623898719...84.m1439.l2649 I purchased 5 of these so if anyone would like one pre wired for quad, hex or octo let me know.

The battery I have in mind is this one. http://www.hobbyking.com/hobbyking/s...arehouse_.html

What am I missing, forgetting, too blind to see?
The 450, 550 dimensions are millimeters. This is the distance from motor shaft to motor shaft measured diagonally across the quad. The stability aspect, I don't know (I am a noob also). I am flying a 500 at about 1kg and really like it (but I have nothing to compare it to, this is my 1st and only quad). The motors and ESCs, I would make sure they can handle 3S and 4S batteries. My ESCs won't handle 4S, so I can't upgrade the power later on. The control board you picked to me is a good inexpensive noobie board. I have the v2 (now v2.1) version of this board and really like it (again I have nothing to compare it to). It flys good right out of the box, even before you "dial it in" (adjust the gyro pots). The battery you picked seems very heavy. I am flying with a 2200mah 40C, and it weighs less then half of yours. Wish I could help more, but I am still learning.
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Old Feb 24, 2012, 11:03 AM
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Why that choice of battery out of curiosity. Batteries have yet to be purchased so the choice is open.

The esc's are a done deal, paid for and on the way. No backing out on them now.

And last but not least what size props for those particular motors?
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