Newbie questions.

[Steve-S63]

Howdy,
I have 2 GBx kits in my untrained hands and a modified Air Force Glider to power with them. As the glider is now it's at around 16oz, IIRC, with 2 J250's and my TP 1900 2S1P (11.4A) or LF 1800 2S1P (18A). I can't afford any 3S batteries at this time so 2S will have to do. I'm looking to get around a 1:1 thrust to weight ratio, or better, with smallish props, 4x2.5 is what I have on the J250's. The only brushless ESC I have came with one of the cheapo outrunners. I'm pretty sure it's the BP21 (21 amps max or 21 winds on the motor?). The database looks like a 15T would do but the motor calc suggests the amperage would be excessive and the thrust less than the database is showing. Would a 15T work or would the amps be too much? I'm reasonably certain that I should use a Delta wind but is that correct (it's DD of course). I have the tutorials but haven't read through them yet. Do they discuss the 2 different winding methods or should I familiarize myself with the Delta winds before going through them? Is there a special or better way to wind the two motors to use them off of one ESC?

Thanks in advance.
Steve-S

[ecologito]

I looked at the GB data base and I am guessing you have a 22 mm stators, this were my findings...

Wiring Data: 1 strand(s), 12Turns of 24AWG Wye
Magnet Data: (12) 5 x 5 x 1mm N45 magnets arranged as 12 poles
Prop Gunther 4.9 x 4.3
7.97 volts - 8amps - 12720 RPM - 9.27 oz. of thrust

Will that work?

[Steve-S63]

The thrust looks great. The kits come with 26AWG and N50 magnets IIRC. Would those make that much difference? I think the N50 are stronger are they not? I tried looking through the database and everytime I tried to sort the results by a column header the results would again be truncated to a max of 10. That made it kinda hard to see what was there. Thanks for looking for me. I appreciate that.

Steve-S

[ecologito]

you are right Steve, N50 magnets are stronger so that will lower the amps a bit and give you a little more thrust. About gauge wire, it will make a difference, I've heard Radioshack carries wire if you don't wanna order it.

Remember, if you are building a plane with two motors they must be exactly the same ( size, winds, wire and magnets).

Good luck and let us know how the building goes.

[Steve-S63]

I remember seeing a thread about someone who was selling, or developing, pairs of outrunners that are specially wired to be run from a single ESC. Should I simply wire these in parallel? Series? Is there some fancy wiz bang wiring scheme that would be more friendly to the single ESC arrangement?

Thanks for the help.
Steve-S

[Steve-S63]

I remember seeing a thread about someone who was selling, or developing, pairs of outrunners that are specially wired to be run from a single ESC. Should I simply wire these in parallel? Series? Is there some fancy wiz bang wiring scheme that would be more friendly to the single ESC arrangement?

Thanks for the help.
Steve-S


I understand that both motors need to have the same magnets, wire, winds but what, if anything, do I need to do to make these both work well on a single ESC? Is there a special way of connecting them together? I also saw another post on wire size that said to use the largest diameter that will fit for that number of winds but I've been advised to use 24AWG instead of 26. What are the benefits of a smaller diameter wire other than being able to fit more winds? Would that reduce resistance and thereby increase amps?

Thanks in advance for any help with this.
Steve-S

[DuBonnet]

After reading your post makes me think you have the guages reversed. The 24 is the thicker wire.

[Steve-S63]

Doh :eek: You are correct sir. I keep forgetting that wire guage is like shotgun guage, smaller number is larger diameter. Thank you for the correction. I have some 24AWG now but it's not newbie wire, all one color, so I guess I'll just have to pay attention to what I'm doing when I wind it.

Thanks for all the help. :)

Steve-S