First quad build ... have I specced it right?

[Rob Tomlinson]

Hi all,

New to the forum and quads ... any RC device actually.

I am thinking of building the below spec quad, have i over / under specced anything or would you recommend swapping any of the components out for anything different.

all advice is welcome!

Frame - Tarot 250
Motors - RCX 2205 2350KV
ESC's - DYS SN 30a BL HELI OPTO
Flight control board - CC3D Open Pilot 32 Bit
Battery - 1800 mah 4 cell
Props - 6030 diatones

I was trying to build something that will be fast enough for me not to have to upgrade any time soon but easy enough to control while learning.

I don't know enough about the FPV gear yet to make any decisions about those so any recomends would be great!

 

[ringolong]

10-20A escs for these motors. This will be a fast quad!

This isn't your first quad is it?

 

[HDtallrider]

I agree with ringalong. You're building a very fast quad designed for experienced pilots. Have you considered an inexpensive RTF quad to learn on? You WILL crash in the beginning. A lot! Crashing a $50 to$60 easy and cheap to repair quad is one thing. Crashing the quad you spent hundreds of dollars on and numerous hours building is quite another. Can you give us an idea of budget? When you feel you really are ready to build, there are a couple of "transformable" quads that would be easy to fly and then easy to convert to speedy little dudes. Oh, and welcome to the forum Rob!

 

[Rob Tomlinson]

Thanks for the info folks

Roger that on the esc amps

So what's the theory behind the esc ampage? I had it that the higher the amps the more power they can feed the motors to help it out of a potential high load stall?

I don't want to have to build up a training wheel quad just to learn on ... I have been playing with a little micro quad in the house and reckon I should manage fine with the real thing ... I know it will take some learning but I have always prefered the in at the deep end approach

 

[Dudeskin]

Could always get a few 3s batteries first then get 4s after your getting into it a lot.
My only thing about getting the best straight off is that your gonna miss out a bit on the feeling of upgrading parts and feeling the differences.
But that being said, temptation is a powerful thing. Haha.

 

[ringolong]

The motors you have listed will never draw more than 20 amps on a 4s so it is a waste of weight to use 30 amp. Less weight is the key to keep these nimble and in the air longer.

You will also need smaller props if you are going with a 4s setup. max is 5040 for 4s, see the chart below. And buy a A LOT! lol

 

[HDtallrider]

Here is a possibility for you. You didn't state a budget but this is not in the break the bank territory;

http://www.rctigermotor.com/html/2014/Combo_pack_0904/242.html
You can find them on line for less. Get the 2300kv. Start with larger props and work your way down to smaller high pitch props when you think you can handle the speed. Get good props and a balance them.
For your frame this is a very versatile option. You can buy it in G10 or CF and there are optional arms to handle different size props. You can change the motor angle. Even the configuration. Very cool!

http://www.aimdroix.com/store/index.php?route=product/product&product_id=59

More wisdom(Haha!); Don't bottom feed when you buy your components. You'll just be frustrated and it will cost you in the long run. Avoid buying direct from China if at all possible. They are in absolute chaos right now.
This looks to be a fun project!
Welcome to the disease, I mean hobby!!!

 

[Rob Tomlinson]

Thanks for all the info folks

the table confuses me alot ... can you help me out there? what am i looking at lol

also ... i thought larger props gave more thrust ?

seems i have alot more reading to do!

 

[HDtallrider]

Thanks for all the info folks

the table confuses me alot ... can you help me out there? what am i looking at lol

also ... i thought larger props gave more thrust ?

seems i have alot more reading to do!

At first glance it does seem confusing. When people talk about larger props producing more thrust more efficiently they are usually comparing lower KV motors to higher KV motors using the same size battery. KV= rpm@1 volt. In the chart above you see a little bit of that but with the same KV motor. I you look at the GF5040 prop @11.1v @ 100% it generates 484g thrust while drawing 11.13 amps. Go down to the GF6045 prop @ 11.1v @ 75% it generates 500g thrust while drawing 10.83 amps. So slightly better efficiency at the same KV. Using 14.8v the 5040 prop kills and the 6045 prop begins to cause overheating.
Here is a chart that shows same size motors with different KV. Look at the differences in efficiency for the same voltages.

http://www.rctigermotor.com/html/2013/Navigator_0910/34.html

Hope this helps. I picked this motor because it is close to what you will be using.

 

[Rob Tomlinson]

looks like i still have a lot of reading to do!

Thanks for all the advice, i will get some pictures of the build up when i get going with it ... don't laugh at my soldering!