The bike is coming together well with the majority of the rolling frame assembled. As it sits at the moment, it has just hit 7.5kg. Still need to add bottom bracket, crank and chain so it looks like around 8kg before I start adding electrics.
I have configured the bike for a comfortable upright riding position and gone with 700C x 35 road tires for some added cushioning and good puncture resistance (in comparison to a normal road bike anyway)
Few minor problems I have run into.
I needed to go down to 180mm rear disc to clear the chain stay. Originally had a 203mm selected for the back.
I wanted to fit a road bike chain ring with 50 plus tooth count for a comfortable high speed cadence. Again issues with chain stay clearances. Being a mountainbike frame, it is designed for up to a 46tooth chainring and also the the large chainring is naturally spaced out by the 2 other chain rings normally on the crank set. To get around this this I will fit a Schlumpf bottom bracket with a 42 tooth chain ring. This fits nicely on the bike.
So now to the power plant.
Well Full-throttle was right about the friction drive.
For the bike to be a true weight weeny, friction drive really was my only choice. However, I want this to be a cut above any fiction drive attempted so far.
This drive will not be about high power but more about seamless integration. Power wise, it will come close to fitting into the Aust Legal limit under most riding situations. However it will be capable of pumping out 1000W when it needs too and of course it wont be speed limited.
My aim is to use to the new CA3 with PAS to control the ESC. I think this may be a first for an RC style drive system to be used in conjunction with a PAS so it will be interesting to see how it goes.
On a previous build, I experimented with the friction drive mounted under the bottom bracket. Made for a super stealthy install and worked quite well.
This build will follow a similar theme however mounting of the drive is much more of challenge due to the carbon construction of the frame. Obviously there is no drilling of mounting hole in this sort of frame. I also need to be mindful of using clamp mounts as carbon frames done like crush loads on them. Anyway I think I have it worked out so more to follow on this part of the build.
Motor wise, I will start off with some cheap standard Hobby King motors on 6S to get everything tested and running correctly but the plan is to go with a high end Scorpion RC motor and HV ESC.
Also looking to run 10S of various ah capacities. I really want to limit battery weight to around 1.5kg so as to keep the total bike weight to around the 10kg mark ready to ride. Great thing about this sort of bike is that running out of battery is a non event with the bike riding similar to a road bike for getting you home.