ParkZone UltraMicro T-28 Brushless Conversion - RC Groups
View Poll Results: Which motor?
2 Gram 2 20.00%
3.1 gram 6 60.00%
lower kv but more expensive 3.1 gram 2 20.00%
Voters: 10. You may not vote on this poll

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This thread is privately moderated by AddictedToRC, who may elect to delete unwanted replies.
Jan 19, 2011, 09:01 PM
Airplane Dope
AddictedToRC's Avatar
Build Log

ParkZone UltraMicro T-28 Brushless Conversion


I'm going to convert my PZ UM T-28 to Brushless. I'm going to get the motor and ESC from HobbyKing. There are 3 motors that I'm considering: A cheap Hextronic 2gram motor; a kinda expensive 3 gram motor; and another even more expensive lower Kv 3 gram Motor(Both 3 grams are AP03's.). Maybe even the AP05? Any comments welcome.
EDIT: I don't have much money to use on it, so I kinda want to keep it cheap. What do I need: More torque or more speed? (lower or higher KV)
Last edited by AddictedToRC; Feb 07, 2011 at 10:04 AM.
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Jan 30, 2011, 11:03 PM
Foam Av8r
RogueTitan's Avatar
Lower KV = more torque but slower top end speed higher KV = less torque but faster top end speeds.
another really good source for cheap motors is WWW.RCTIMER.COM
Jan 31, 2011, 09:42 AM
Airplane Dope
AddictedToRC's Avatar
Quote:
Originally Posted by RogueTitan
Lower KV = more torque but slower top end speed higher KV = less torque but faster top end speeds.
another really good source for cheap motors is WWW.RCTIMER.COM
Thanks! So which one should I get?
Feb 06, 2011, 07:36 PM
RCG -Minus Member
microflitedude's Avatar
The 2 gram motor looks a bit small. I would go with the "AP05" or "AP03", along with the turnigy 3 gram BL ESC.

Most people use those for Ultra-Micro conversions, and have great results.
Feb 06, 2011, 10:47 PM
Airplane Dope
AddictedToRC's Avatar
Quote:
Originally Posted by microflitedude
The 2 gram motor looks a bit small. I would go with the "AP05" or "AP03", along with the turnigy 3 gram BL ESC.

Most people use those for Ultra-Micro conversions, and have great results.
Yeah, the AP03 is 3.1 grams, and that's what I'm thinking of. Should I get lower or higher KV?
May 31, 2011, 03:49 AM
Registered User
Optic-Flare's Avatar

T-28 Brushless upgrade


I upgraded my T-28 for $38.37 and am very happy with it. The video has all the parts and pictures, & I just used the stock propeller.
Parkzone Ultra Micro T 28 brushless RC Plane conversion for $38.37 (3 min 4 sec)
May 31, 2011, 08:47 AM
Airplane Dope
AddictedToRC's Avatar
Quote:
Originally Posted by Optic-Flare
I upgraded my T-28 for $38.37 and am very happy with it. The video has all the parts and pictures, & I just used the stock propeller. http://www.youtube.com/watch?v=3ZvzvhjbTBY
Sweet! Right now I have a UM Scratchbuild because my Trojan quit working, so I used the guts. But my RX board isn't working, and a friend gave me some electronics so I bought an RX and battery and I am starting a Build Log here: https://www.rcgroups.com/forums/show....php?t=1448176
Apr 10, 2013, 09:38 PM
Registered User

brushless conversion um t28


Quote:
Originally Posted by AddictedToRC
I'm going to convert my PZ UM T-28 to Brushless. I'm going to get the motor and ESC from HobbyKing. There are 3 motors that I'm considering: A cheap Hextronic 2gram motor; a kinda expensive 3 gram motor; and another even more expensive lower Kv 3 gram Motor(Both 3 grams are AP03's.). Maybe even the AP05? Any comments welcome.
EDIT: I don't have much money to use on it, so I kinda want to keep it cheap. What do I need: More torque or more speed? (lower or higher KV)

I done the brushless conversion for um t-28. Every thing i used came form horizonhobby for around $65. Alot faster an still just as stable.

Part #s
BL 180 brushless outrunner 2500kv
EFLUM180BL2

Spinner
EFLU4851

Prop Adapter
EFLU4067

Eflight 5amp pro brushless ESC
EFLA1005

Motor mount/firewall came from umx beast3D that was crashed. Every thing turned out nice an cog was great. The motor mounted were stock motor was, I had to remove the front landing gear an mount for esc. Im still useing the ar6400 that came in my um t28 so i still have rudder an elavtor controls. I'll post pics shortley.
May 31, 2013, 05:32 AM
Registered User
total nube here,can you give me more details on the t28 brushless conversion.
Jul 26, 2015, 03:09 PM
Registered User
Im getting into the conversion for my t28 um it seems the motor is stopping after 10seconds of flight and I lack a lot of power.
First off, what decides if we do 1s or 2s conversion? I guess advantages of2 s is more power? Disadvantage is I guess you need to buy 2 s batteries ??

I would be using my stock Trojan um and getting only a motor and an esc. I wanna keep it cheap so I was goin to get it all from aliexpress in china :
6 dollars for SKYI 6A 2S LiPo Battery Brushless Motor Electronic Speed Controller ESC With 5V/0.8A Linear Mode BEC for RC Fixed Wing Airplane

And 10 bucks for RC Hobby Motor 1811-2000 18-11 2000kv Micro Brushless Outrunner (10g)
Spec.
Model: 1811-2000
Kv: 2000rpm/v
Weight: 10g (With wires and mount)
Suggested Prop: 7x5
Suggested Power: 7.4v
No Load Current: .4a
Thrust: 130g / 5000rpm
7.4v no-load speed: 15000rpm
Peak Eff Current: 5.5A
Shaft: 2mm
Diameter: 18mm
Length: 30mm (including mount & shaft)

Does that seem like the plane will perform? Is the esc And Motor ok'? What batteries should I be getting?
Thanks guys!

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