|Quest, Quattro & Wobbly Bob|
|Lee Wakefield's High Speed Crash|
|Ian Perry Flashing His Knees|
I was talking to Jim at work the other evening about the efficiency of the drive chain in Quattro and it occurred to me that what I had assumed about the Sprags being locked is not actually the case. Because of the slight speed variation in my UJs, unless they are lined up, the drive shaft will drive one wheel and then the other, depending on the relative position of the UJs. I think the speed variation is only about 1.2% but it could create quite a bit of drag as each Sprag locks and unlocks under torsional and side loads. A cure would be to have the aligned UJs fixed to the drive shaft and the Sprags on the outside. Having said all that, on a velodrome, I am probably driving the inside wheel for 80% of the lap.
|Steve in his Beano|
|Howard Yeomans in his Great White|
|UJ Outer & Bearings|