jeffie8696

Pardon my newbieness regarding brushless motors.
I have a nice ball bearing gear drive for a speed 400 that Idont want to go to waste. I would love to find a nice inrunner brushless that will bolt up to it , can you give me a recommendation? I would love to get it cheap from Hobbyking if possible. I am on a serious budget

soarhead-RCU

Most 400 size motors are 20mm in diameter so that is the physical size that fits in most 400 gear boxes. 400 inrunners can come in 2 different can lengths, the longer length is ussually capable of handeling more watts. For instance the Himax 2015 size is about a 100-120 watt motor and the 2025 is 170-180 watt motor.
Then you need to know the gear ratio of the box to decide how high a KV motor you want and what size prop you wish to swing for your application. Most shafts on this size motor are the same size so getting a pinion gear is not a problem......

Good Luck
Bob

jeffie8696

Good news. thanks a million.
My gearbox comes with 3 different gears so you can tailor your application. It is a very nice unit that is why Idont want to see it languish.
How about this gem? http://www.hobbyking.com/hobbyking/s...idproduct=2106

Dr Kiwi

I think Bob is incorrect on the size which might fit that box... Speed 400s are ~27.6mm diameter so a 28mm inrunner is probably your best bet. I'm not saying a 20mm inrunner won't fit but I'd check the mount hole spacing. You might fit an outrunner with 16mm hole spacing.

Do you have the ACC347: http://www.maxxprod.com/pdf/acc347instructionsheet.pdf

jeffie8696

Thats the one. Thanks . a 16mm spacing should help in the choices.
Now to juust decipher the power ratings.

Dr Kiwi

I have a couple of those ACC347s and just about any size motor (inrunner or outrunner) with 16mm spacing will fit on 'em... the only fly in the ointment is the fact that the original set-screwed pinions are for 2.3mm shaft. I don't know what pitch they are (they seem fairly coarse) but you need to make sure you can get the correct pitch pinions or bore out those you have to suit a brushless motor shaft (which will be 3mm, 3.2mm, 4mm... but NOT 2.3mm).

jeffie8696

opening up the hole shouldnt be a problem.

Dr Kiwi

At least they are long pinions so they'll fit securely in a lathe chuck.. they MUST be drilled out accurately and a lathe is the only way I know to do it properly.

soarhead-RCU

Woops!!!!My bad!!!!

Guess I had a "Senior Moment" or one to many swiggs of Mountain Dew. I had "300" size motors on the brain. As ussual The Dr is correct.......

Good Luck
Bob