20-05-2010, 09:33 PM
Recently I have had to replace the motor in my T28 due to the original unit developing cracks in the plastic part of the bell, which in turn allowed the shaft of the motor rotate independently of the bell.
As there are a number of these planes in our club I thought it would be useful to others if I documented the exercise, so here is what I have done.
I have chosen to replace the original motor with a Turnigy 35-36C 1100kV as it is a good quality motor for its price.
Unfortunately the Turnigy does not screw straight onto the original motor mount, so I have constructed a new mount from some 25mm stand offs and 3mm aluminium plate which picks up the original mounting holes on the firewall. See the attached drawing for the details of these parts.
As it turns out anyway the plastic mount was cracked and from what I have read from other threads it is recoomended that using a more powerful motor requires a stiffer and stronger mount.
The images below show the mounted up motor.
Using 25mm stand offs require the cowling to be modified as shown below.
Once this is done the cowling can be refitted.
The original prop does not fit the Turnigy motor so a replacement is required and this is where I'm at now.
I know some of our members have already replaced the motor in their T28, so could I please get some feedback on the prop size and if you have used the original ESC what timing setting did you use. I powered mine up with the original prop, which I modified to fit the shaft, only to find the motor missing at full revs - it was drawing 28amps. The E-Flite manual for the ESC indicates that for a 14 pole motor either standard or high advance timing can be used. Any thoughts or experience?
As there are a number of these planes in our club I thought it would be useful to others if I documented the exercise, so here is what I have done.
I have chosen to replace the original motor with a Turnigy 35-36C 1100kV as it is a good quality motor for its price.
Unfortunately the Turnigy does not screw straight onto the original motor mount, so I have constructed a new mount from some 25mm stand offs and 3mm aluminium plate which picks up the original mounting holes on the firewall. See the attached drawing for the details of these parts.
As it turns out anyway the plastic mount was cracked and from what I have read from other threads it is recoomended that using a more powerful motor requires a stiffer and stronger mount.
The images below show the mounted up motor.
Using 25mm stand offs require the cowling to be modified as shown below.
Once this is done the cowling can be refitted.
The original prop does not fit the Turnigy motor so a replacement is required and this is where I'm at now.
I know some of our members have already replaced the motor in their T28, so could I please get some feedback on the prop size and if you have used the original ESC what timing setting did you use. I powered mine up with the original prop, which I modified to fit the shaft, only to find the motor missing at full revs - it was drawing 28amps. The E-Flite manual for the ESC indicates that for a 14 pole motor either standard or high advance timing can be used. Any thoughts or experience?