Hello,

I am looking for a brushless that will fit a 400 size gearbox and I have found the Ultrafly D/13/32 at an attractive price, especially compared to an inrunner that fits 400 size gearbox. Anyone have any comments on the Ultrafly? I have never heard of them but their motors look real nice.

Thanks, Jimmy

I have only ever tested one Ultrafly motor [B/06/10], and that a year ago, so please do not take this as a definitive statement on the quality and performance of all Ultrafly motors. With that particular motor, and that one only, I found some of their claims of being the "lightest motor capable of turning an 11" prop" and with "better efficiency" than their competitors to be ill-founded [and, boy, did that motor get hot on 3s and/or at any more than 100w].

Here are the test stand numbers, and my comparison with "similar motors". Output in terms of g/W is taken [not strictly correctly] to be a measure of "Efficiency".

This is not to say that newer and very different motors, such as the D/13/32 (is that it? - not D/13/22) you mention, might not be the world's best and most efficient. You'll have to try one and let us all know how good it is!

Cheers, Phil

Phil,

Yes it's D/13/32 not D/13/22 Thanks much for your info. I should have been a little clearer about how I plan to use this motor, this my change the equation, maybe not.

I will install the motor in a 2.3:1 gearbox, and it will swing a 9X5 prop. Does this help with a motor that may run hot?

Also, the only reason I am going with a brushless motor is because I want to use Lipos, I understand there are some complexities with running a brushed motor with Lipos, I have read the forum posts about this subject and I came away feeling just as confused as I was prior to reading them. The pros and Cons of Lipos and brushed motors seems to be 50/50 so I decided to go straight to brushless.

I guess I am getting off the subject of my post but at the same time one thing leads to another

Thanks, Jimmy

Sensible move - aside from other advantages, such as holding voltage under load better, Lipos are so much lighter.

I realized you were going to use a gearbox - this may enable you to swing a larger prop on lower amp draw than you could manage with an outrunner. With that 2.3:1 ratio though, at 3200Kv you are going to be drawing serious amps with a 9x5, aren't you?

Probably no use trying this as a comparable example - apples versus oranges perhaps, but a Walkera 3200Kv I tested drew 19.6A with an 8x6 and that was at 3:1. (sometimes it is obvious one needs to be leery of Motocalc - my real world measurement was fully 60% higher than their estimate of only 12.4A).

Putting 2.3:1 and a 9x5 for the Walkera leads Motocalc to suggest 21.6A - but if that estimate is way low as was the 8x6 - you might need to prepare for 1.6 x 21.6 = 34A - whoa!

Edit - looks as if I'm way out - the Aussie Modelflight site suggests that at 3:1 with a 9x6 your D/13/32 is not going to exceed 120W (say, 12A). Maybe 2.33:1 and a 9x5 will come in under the rated 160W max.

Cheers, Phil

Originally Posted by Jimmy James

Hello,

I am looking for a brushless that will fit a 400 size gearbox and I have found the Ultrafly D/13/32 at an attractive price, especially compared to an inrunner that fits 400 size gearbox. Anyone have any comments on the Ultrafly? I have never heard of them but their motors look real nice.

Thanks, Jimmy

I have two of the E motors (injection molded plastic) and they were a good deal for $25. They are about 140W motors on 3S with typical (mid 70) efficiency. Graphs of the them are here:

http://www.peakeff.com/SearchForMoto...y%25&model=%25

i have the b/6/10 in my ultrafly furious 3d plane swinging a 10x4.7sf and i think its a great little motor, not sure if its worth the $99 AUD price tag thogh, i got mine in a combo deal. i dont find it gets hot at all, althought it gets a LOT of airflow seing as it is mounted to the front of the firewall with no cowl or any obstuctructions, i easily get 15 minute flights from 1050mah 3s packs doing sport flying and around 8-10 minutes of hard core full throtle aerobatics.

I have a uf b/6/10 and the d-3200,fine motorsOn a 4/1 gb and a apc 9/6 prop the d-32 pulls 10 amps and goes like stink in a 23 oz pattern plane I designed.The spec sheet is dead on.

Bad thing about the Ultrafly motors is there are no replacement shafts, I'm looking for a X mount for my B 06/15 anyone have one?