WORK RESUMES ON BUILD No. 3....
Our impending move to Spain is held-up whilst awaiting for a Deputyship application which will allow my wife's sister to sign-off the house on her behalf. Wife Jen's dementia means she can't do it and the legal folks say there's a risk of too much self interest if I do it on my own. Never saw that coming - but either way, it's added several unexpected weeks to our Spanish relocation plans. All of which means I decided to un-crate Build No. 3 and resume work.
Most of the pics here show how I tackled installation of the 3 x drive chains. Right side pedal chain is fitted with an eBay sourced sprung tensioner. Probably not really necessary, given I'll only ever be using the pedals when applying the coaster brake. Looks cool though.
Left side drive chain is presently fits perfectly so I'll not yet fit a tensioner till the chain stretches a little after putting some miles on this ride.
The primary chain proved a little troublesome. Only one UK supplier could sell me the correct chain which matched the output sprocket on my Gnome Rhone motor. The same supplier couldn't sell me a matching off the shelf sprocket for the jackshaft which fit the chain. However, they did sell me a 1/2" pitch x 3/8" wide sprocket and recommended I machined this down to 3/16" width. I now have the sprocket - but my lathe and tools are packed-up ready for the move, so machining it down to correct width will have to wait till after we're in Spain. For the time being, the pic shows the primary chain wrapped round a jackshaft sprocket with slightly incorrect teeth. You get the idea though. I'll decide later if I can get away with fitting a half link (supplied) to the primary chain or whether a tensioner will be necessary.
Amazingly, all 3 x chains fit perfectly, without any clearance issues at all .... almost like I designed it that way. Ha!!!
Also found time to rig-up a means of securing the front of the rear rack to the bike's frame. I used a pair of chromed Munsen rings - same as the ones I used to suspend the gas tank - threaded onto a pair of turned steel extensions. Worked out nicely. Pic shows these fittings mounted snug under the seat.