THUMPER Trampa Electric Mountainboard LEV by Laurentius Judhianto
Hi Builders. It’s been a while since I did my first build with Project LACR http://www.electric-skateboard.builders/t/project-lacr-globe-the-maiden-deck-enertion-single-drive-propulsion-turnigy-sk3-6364-190-kv-vesc-4-10-turnigy-sentilon-100a-24v-10ah-zippy-flightmax-lipo-packs/1115
And from there I have made few more prototypes / builds which are more or less the same, however I would like to introduce my recently finished build, Project Thumper (named after Thumper the character of Bambi)
As usual with all other eMTB builds, the base carbon fibre deck is made by Trampa. While they do now offer motor and motor mount, I gave them a shot. It’s all arrived in a very well packaged box and pre-assembled so it was too easy for me to put it all together.
There aren’t much special things I truly added within this build besides less obtrusive deck drilling and well protected electronics from water entering these enclosures. So I made all of the holes as small as possible. Soon I will put some more sealant to just secure everything.
- Dual Motor eMTB Holy Pro 15 ply 14 tooth set (inc motor mount) from Trampaboards
- Dual VESC 4.10 from Ollinboard
- Dual Enclosure from Underwater Kinetics
- Brooks Bicycle Light
- Bluetooth module from Metr.at
- 2.4 Ghz remote from Aliexpress
- Custom Battery Pack 42V 10Ah Li ion LG Battery (10S5P) with 30A BMS + charger
- Industrial Grade Capacitor from Conrad
- 80A Fuse from Conrad
- Loopkey using XT90 Anti Spark from HobbyKing
Dual 4.10HW VESC is configured with 2.8FW FOC Hybrid (sensored FOC mode) Very smooth, very silent and very powerfull startup torque. Maximum speed somewhere above 40km/h to 50km/h as “too scary too ride” for me.
10S5P Battery configuration by connecting 5 groups of 2S5P in series. In my opinion this is not the best setup but its a decent - cheap BMS setup.
Bluetooth connection with iPhone to look up for speed, battery and distance Live just add new dimension in eBoarding.
I love it being weather proof, I love the big 5 inch wheels running over everything. Simplest charging of all with BMS, a voltage meter to add would be nice to have. All connections are secured with cable ties, shrink wrap and wire mesh.
Personally I got to say that the motors are very well build, also provide ridiculous torque. Comparing 190KV SK3 torque to this 118KV torque would be unfair. However overall I found that 118kv is too slow if you only do 6S configuration. The torque is insane for normal street. But personally I like low KV alot as I can ride longer while keeping the motor current draw low (running cooler). On top of that with the motor spinning faster, makes it slightly more efficient in the long run.
Here are the photos
Few eMTB disadvantages:
- Hard to make sharp turns
- Loosened truck / dampa makes it hard to control at speed over 25kmh
- Big and heavy for daily urban commuters
- For @trampa, please reduce the amount of bolts and nuts. Took sometime to assemble - disassemble completely.
- Lights are not so bright, but I like it
I’ve also designed my own Trampa Mount Cover you can find in Thingiverse that helps keeping branches get stuck between the belt tooth. It’s modular designed, so you can easily swap broken piece with new one.
Lots of ride, Lots of of fun. From The Netherlands with love. Looking forward for the next!