123Cat

At 21 ozs of thrust with an 8 by 4 prop and real good price

Thats the only thing Im worried about,,,,,, does it really matter if you have a prop that small on a 3D model

For the sake of blowing over control suface , I wouldnt have thought it would matter all that much as long as you have the thrust and I guess you can go to a 9 by 4 as long as you restrict your full throttle use

Have a great flying Christmas all

Im going to

cje0114

My Feedback: (27)

Be aware that the BP21 pulls 13 amps with the 8 x 4 prop. you will need a battery that can handle that kind of current.

Balsa products also has new versions of the BP motors that swing larger props now. they are the Y series motors. They are gret motors if your on a budget. I have a few myself.


http://www.balsapr.com/catalog/motors/BPBrushless.asp

Chris

bdavison

My Feedback: (1)

I use these exclusively on the planes I manufacture. I recommend running them with a 9x4 APC slowflyer prop and at least a 1250mah lipo. This is on a 14oz plane, and the vertical is UNREAL. It will rocket straight up out of sight. You will need a high discharge rate, as this motor will pull some amps at full throttle....like about 18 amps. It will heat up a normal lipo at full throttle, but Ive not had any problems even running on something as simple as a E-tec 3cell lipo.

On the 1250mah 3cell I get close to 15-20 min of flight time depending on how much I use the throttle. They are no-frills powerhouse brushless motors. I highly recommend them.

They arent pretty looking like a Rimfire or Axi, but if you dont mind sacrificing asthetics for power...these things kick butt.

123Cat

Thanks bdavison and Chris, for the site

They look just the ticket , Im sold

Happy days are here agin

Ive got a mean weapon plane for them too on my bench

GWR

My Feedback: (31)

They're also cheaper at www.xushobby.com [sm=spinnyeyes.gif]

123Cat

Balsa Products dont ship outside the US

So where else could I locate this BP9Y Brushless that I want

Thanks

The XUS people dont have that motor either

GWR

My Feedback: (31)

They're also called TowerPro motors. Try doing a search using that name.

GWR

My Feedback: (31)

[&o]

123Cat

Thanks GWR

Am searching

123Cat

HiModel , China have the Towerpro motor for $13.75

I think thats US dollars

And it looks like a secure credit card site I think

I havnt tried to register with them yet

They have a motor that can pull a 10 by 4 prop

wolw

You can get them from England, it't called "Bell" over there (here).

http://robotbirds.com/catalog/produc...roducts_id=417

Cheers

Peter

EDIT: I think i was a little bit quick there, thought it was the BP21 you vere after here's the right one:http://robotbirds.com/catalog/produc...roducts_id=714

//Peter

777

My Feedback: (1)

Why do they pull so many amps?

Brad

bdavison

My Feedback: (1)

You have to understand that these motors are about the size of a Axi 2204/54, but have the power of a Axi 2208.
People mistakenly think that size is a factor in amp pull. Its not necessarily. Its the winds in the motor and how the magnets are arranged, etc that determine amp pull.

critterhunter

BDavison, when you say the 9x4 APC works well on a 14 ounce plane are you refering to the normal BP21 or some newer form of it? I've got a 15oz Challenger that I'm in the process of strapping a BP21 on with a 2000ma 3 cell lipo and need to figure out what size prop to use on it. I know the 7x6 APC works best on the Stryker with the BP21 and 3 cell lipo but that plane weighs 21 ounces or so.