RoboBellman
1 µW
- Joined
- Nov 13, 2014
- Messages
- 3
Hello all,
I'm a PhD student at the University of Florida with a unique project for which I need your expertise.
I have taken a TerraTrike Rover and have split the bottom bracket assembly to make it a split-crank trike. There are now two cranksets, each independently driving the rear wheel through a customized version of this hub from Staton-Inc with a standard 16T freewheel on the right-hand side (RHS) and one of these left-hand threaded 16T freewheels on the left-hand side (LHS). In addition, each of the two driving cranksets up front have an SRM PowerMeter embedded in them, so I can measure torque applied to the each chainring by its respective crank arm.
Here's a picture and a video of the different ways you can pedal this beast.
http://i.imgur.com/iOwSBl7.jpg
http://youtu.be/3hk_Vkcji1Q
What I'm trying to do now is to motorize both sides of the trike. That is, there's a drive chain on both sides, and I want two electric motors with at least 250 W output each that can assist pedaling for both sides (the idea being that one motor could drive the trike around at a reasonable speed on flat ground). Because of the complexity of the bottom bracket, I don't think I can use a bottom-bracket-mounted kit (I've used a GNG mid-drive kit on another, non-split-crank trike). Because of the complexity of the rear hub and the dual drive feature, I know I can't use a hub motor. That leaves me, I believe, with a mid-drive setup, where there is a motor attached to either side of the frame with its output on the drive chain, between the front crankset and the rear hub*. I think the best place to implement this is behind the seat, which looks like this: http://imgur.com/lvjOLFZ
So, my question to you experts is: How would you motorize this monstrosity, given the constraints I've mentioned? My thought right now is to buy two of these side-mounted kits from GNGelectric and modify as necessary.
What are your thoughts? Suggestions? Comments?
Thanks for your time and any assistance you can provide.
Matt
*EDIT: "flywheel" to "hub"
I'm a PhD student at the University of Florida with a unique project for which I need your expertise.
I have taken a TerraTrike Rover and have split the bottom bracket assembly to make it a split-crank trike. There are now two cranksets, each independently driving the rear wheel through a customized version of this hub from Staton-Inc with a standard 16T freewheel on the right-hand side (RHS) and one of these left-hand threaded 16T freewheels on the left-hand side (LHS). In addition, each of the two driving cranksets up front have an SRM PowerMeter embedded in them, so I can measure torque applied to the each chainring by its respective crank arm.
Here's a picture and a video of the different ways you can pedal this beast.
http://i.imgur.com/iOwSBl7.jpg
http://youtu.be/3hk_Vkcji1Q
What I'm trying to do now is to motorize both sides of the trike. That is, there's a drive chain on both sides, and I want two electric motors with at least 250 W output each that can assist pedaling for both sides (the idea being that one motor could drive the trike around at a reasonable speed on flat ground). Because of the complexity of the bottom bracket, I don't think I can use a bottom-bracket-mounted kit (I've used a GNG mid-drive kit on another, non-split-crank trike). Because of the complexity of the rear hub and the dual drive feature, I know I can't use a hub motor. That leaves me, I believe, with a mid-drive setup, where there is a motor attached to either side of the frame with its output on the drive chain, between the front crankset and the rear hub*. I think the best place to implement this is behind the seat, which looks like this: http://imgur.com/lvjOLFZ
So, my question to you experts is: How would you motorize this monstrosity, given the constraints I've mentioned? My thought right now is to buy two of these side-mounted kits from GNGelectric and modify as necessary.
What are your thoughts? Suggestions? Comments?
Thanks for your time and any assistance you can provide.
Matt
*EDIT: "flywheel" to "hub"