Ultrafly Fourm - Page 24 - RC Groups
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Feb 24, 2005, 02:37 AM
Registered User
Beardking's Avatar
Well, I jumped on the bandwagon even before knowing that there was one. I basically made an impulse buy this past weekend and got the Extra. This will be my first venture into electric planes, so I'm looking for some fun. I've only flown glow so far.

The only thing I can complain about so far is that I can't seem to get the tailwheel to mount very well. I followed the directions as best as possible, but for some reason I can't get the part that you glue on to the fuse to stick like it should. Hopefully I'll get that figured out before this weekend so I can maiden it. (oh, and I found out why you shouldn't put the decals on at 2 in the morning. I think I'll be the only extra around with the stripes on the bottom of the wing. )
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Feb 24, 2005, 03:32 AM
RC Player
We recommand you to change the gear ratio to 2.38 to 1(M) if using a 7x5E prop. The current in our measure is a lot more than 12amp if using 1.93 to 1 settup (L) with 3S Lipo. I would worry this set up could burn out the motor easily.


Feb 24, 2005, 04:17 AM
Keep building, buying,fly
Bigplumbs's Avatar

I have actually measured the current on a meter and it was 12 amps on the 7 x 5e prop. and 9 amps on the 6 x 5.5e. I ran it static on the 7 x 5e for minute or so WOT and the motor only got warm. Putting this together with the fact that I thought it flew slow on the6 x 5.5 is there any way I could have got the wrong gear box in the kit. How do I know which gearbox I got.

What amps would you expect with the 7 x 5e as my meter could be out a little but I wouldn't think too much



BTW I have ordered the brushless F16 from my LHS in the UK they tell me it is on the sea at the moment CML Distribution in England any idea when they were shipped as a matter of interest
Feb 24, 2005, 10:25 AM
RC Player
Hi bigplumbs,

The current you have got is the 12V NiMh result. I you are using NiMh then this is fine! If using 3S lipo we got 14-15amp on the 7x5e prop. Another possible reason is your Lipo is not discharging that much current due to some reason. As long as the current draw is lower than 12amp, I believe it is safe to go for it.
How to determin the gearbox?
You should be able to read the number and symbol on the plastic gear.
L: 1.93
M: 2.38
N: 3.0
P: 3.9

The F-16 should be arriving to UK this week. It may take another few day to clear the custom. Call the CML to see if they got it!

Feb 24, 2005, 11:34 AM
Keep building, buying,fly
Bigplumbs's Avatar
Thanks Charlie I have an L so I have the correct gearbox. I will give it a go with the 7 x 5 as I feel I want that little more power but not too much as I have several Brushless planes and like the slower closer in feel of the Hawk. I am please to see the F16's should be in the UK next week as I cant wait I have ordered the brushless version. I also think that it might be a good idea to consided outrunners in you models to get rid of the gearbox. Mind you I have to say that you make and design excellent planes far better than G*S................ Your pieces line up nice.

Last edited by Bigplumbs; Mar 01, 2005 at 06:34 PM.
Feb 28, 2005, 07:37 PM
slippy slimey
booger's Avatar

ultrafly outrunners

charlie would you please explain the capabilities of these new motors and which of you models you would recommend them on
Ultrafly Model B/06/10 Brushless Motorr
Ultrafly Model B/06/12 Brushless Motor
Ultrafly Model B/06/15 Brushless Motor
Ultrafly Model D/13/32 Outrunner Brushless Motor
Ultrafly Model D/13/32 Outrunner Brushless Motor w/Gear
also explain the difference in the last two
thanks Robert
Last edited by booger; Feb 28, 2005 at 07:42 PM.
Feb 28, 2005, 07:53 PM
Hooper, full throttle!
Tommy D's Avatar
The search engine is your friend.

Much has already been posted on the brushless motors in the powerplant forums.

Have a look!

Feb 28, 2005, 08:07 PM
Insert Witty Comment
Suntzu's Avatar
I searched and couldnt find anything on them. I note that these new motors are the same price as the older ultrafly motors. I thought they were a new "value" range???
Feb 28, 2005, 08:38 PM
slippy slimey
booger's Avatar
i searched too and couldn't find any posts on the new outrunners or the 32kv with gear
Feb 28, 2005, 08:43 PM
RC Player

The lightest motor that can turn an 11 inch propeller

The lightest motor that can turn an 11 inch propeller

Allow me to copy the sentence in our manual/catalog.

Ultrafly’s B/06/xx series brushless sensorless motors are designed for 3D models and Park Flyers. The precision CNC tooling with hi-quality material allows this motor to operate at higher RPM without vibrations. A unique patented design forces the magnet to hold its position when your propeller suddenly stops in high RPM. Quality, efficiency and light weight are the goal we are shooting for! Compared to all of our competitors in the 3D market, the “B” series motor has better torque than any other 3D motor with only 42g (1.47oz) in weight. Among all motors capable of turning an 11 inch propeller, this is the lightest one in the market so far. With higher torque, we deliver better (3-10%) efficiency when you put in the same power at large propeller application. It also means better acceleration while the airplane transforms from hovering to aggressive maneuvers.

Shaft diameter: 3.17mm, 1/8inch
Shaft Length: 11.5mm
Motor Diameter: 32.5mm
Motor Length: 41mm
Motor Weigh: 42g, 1.47oz
Distance of mounting holes: 16mm & 19mm
Mounting screw: M3x3mm
Maximum Input Power: 180watt
Maximum RPM: 16,000
Maximum Operating Temperature: 100゚C
Magnet: Neodymium (150゚C temperature tolerance)

B/06/10 12amp max kv=1000
- 3D -----450 g,16oz (9 - 11 inch prop)
- Sports--700g, 25oz (8 - 10 inch prop)
- Hi-Wing-1kg, 35oz (8 - 10 inch prop)
B/06/12 14A max KV=1200
- 3D -----400g, 14oz (8 - 9 inch)
- Sports--700g 25oz (7 - 9 inch)
- Hi-Wing -900g,32oz (7 - 9 inch)
B/06/15 16A max KV=1450
- Sports---700g, 24.5oz (7 inch)
- Hi-Wing --900g, 32oz (7 - 8 inch)
- Speedy--600g, 21oz (5 - 7 inch)

Remember this is only a 42g motor that can deliver a torque as big as a 80g plus motor!!
Feb 28, 2005, 09:00 PM
Renewed interest
ozace's Avatar
looks exciting charlie
Feb 28, 2005, 09:12 PM
RC Player

[B]A Bargain for Quality and Performance. [/B]

A Bargain for Quality and Performance.

Designed for gear drive applications, Ultrafly’s D/13/32 brushless, sensorless “outrunner” motor is a unique and affordable option for park flyer models weighing below 1kg (2.2lb). Its high-quality construction and precise CNC tooling enable this motor to operate at higher RPM without serious vibration. The D/13/32 fits in many 300/400 size gearboxes, and features a shaft diameter and screw holes comparable to a 400 motor.

Used with the appropriate gear ratio, the D/13/32 can turn propellers ranging from 6 inch to 11 inch diameter. You can power it with NiCd or NiMH batteries having 7-10 cells, or with a 2-3 cell Li-Po battery. See the motor application reference table below for more details.


Shaft Diameter: 2.3mm
Shaft Length: 12mm
Motor Diameter: 23.5mm
Motor Length: 43mm
Motor Weigh: 42g (1.42oz)
Distance of Mounting Holes: 16mm & 17mm
Mounting Screw: M3x3mm
Maximum Input Power: 160watt
Maximum RPM: 40,000
Maximum Operating Temperature: 100°C

D/13/32 Brushless Motor Application Reference Table

Airplane Type Battery Gear Ratio Propeller
250-340g 3D models 3S Lipo 3 to 1 APC 10x4.7SF
250-340g 3D models 3S Lipo 2.33 to 1 APC 8x3.8SF
340g-500g 3D models 3S Lipo 3.9 to 1 APC 11x4.7SF
340g-500g 3D models 12V NiMH 3.9 to 1 APC 11x4.7SF
350-450g Sports Models 9.6V NiMH 3 to 1 APC 9x6SF or 8x8E
450-600g Sports Models 12V NiMH 3 to 1 APC 9x6SF or 8x8E
450-600g Sports Models 3S Lipo 3 to 1 APC 9x6SF or 8x8E
400-500g Speedy models 9.6V NiMH 2.33 to 1 APC 7x5E
500-600g Speedy models 12V NiMH 2.33 to 1 APC 7x5E
500-600g Speedy models 3S Lipo 1.93 to 1 APC 6x5.5E
600-750g Hi-Wing Trainers 9.6V NiMH 3 to 1 APC 9x6SF or 10x4.7SF
750-1000g Hi-Wing Trainers 12V NiMH 3 to 1 APC 9x6SF or 10x4.7SF
750-1000g Hi-Wing Trainers 3S Lipo 3 to 1 APC 9x6SF or 10x4.7SF
650-800g Gliders 9.6 NiMH 3 to 1 9x5 or 9x6 folding prop
750-1000g Gliders 12V NiMH 4 to 1 10x6 folding prop
750-1000g Gliders 3S Lipo 4 to 1 10x6 folding prop

Application on Actual Model
GWS Warbirds 400-500g 9.6-12VNiMh 3 to 1 APC 9x6SF or 8x8E
GWS Estarter, Beaver, Big stick 8.4-9.6V NiMh or 2S Lipo 3 to 1 GWS 9x6, 10x4.7 or APC 9x6SF, 10x4.7SF
Ultrafly PC-9, Cessna 182 9.6V-12VNiMh 3 to 1 APC 9x6SF or 8x8E
Ultrafly Extra 300S 12VNimh or 3S Lipo 3 to 1 APC 9x6SF
Feb 28, 2005, 09:45 PM
RC Player

D/13/32 motor picture

Hi Guys ,

Here is a picture of the D/13/32 motor for your reference
Feb 28, 2005, 10:28 PM
slippy slimey
booger's Avatar
oh doesn't that look nice and expensive, and what ultrafly models are they recommended for? I got em sorry about asking question twice
Last edited by booger; Feb 28, 2005 at 10:46 PM.
Feb 28, 2005, 11:19 PM
Registered User
LTChip's Avatar
These motors may have me going back to a gear box.

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