Unfortunately It was impossible for me to arrange a direct shipping of a Luna Cargo frame directly from Lunacycles to my shop here in Italy, for a customer who's obsessioned by that frame, so, the customer has ordered it himself for shipping in the US and forwarded it to Italy from his own US address.
So there's actually a Luna Cargo fat frame here in Italy....
Having white paper from the customer, I decided to try the hard but not impossible fit of a TDCM igh motor from Grin Tech.
Since the Luna cargo fat has an uncommon 135mm rear dropout (uncommon for fats obviously) the TDCM fits well, not the best chainline with a 100mm BB shell, but with some effort it is acceptable. Sadly the luna frame has an exaggerated chaistay length and the plan to re-project the rear rh dropout to allow a belt installation couldn't be achieved. At least until Gates will offer a properly sized belt....
Here some first impression and lacing details:
As per Justin's advice in the existing TDCM thread: https://endless-sphere.com/forums/viewt ... 4#p1196093 , The motor has an anti-rotation torque plate that is independent from the axle and features a long slot that fit better on sliders than on standard dropouts.
Here is where the spinningmagnet consideration would apply:
Yes, if you plan a nice and clean old style cruiser conversion, with curved tubing and slide dropouts, with a single speed chain or belt setup over an IGH, the non standard curved downtube of many cruisers and vintage style frames as well as their non standard stays/tubes insertions in the Bottom Bracket node, often makes a crankdrive installation from very hard to impossible, there, the TDCM is the only option.I think this is a great option for vintage bicycles, because mid-drives are very problematic to fit a curved downtube...
Anyway the more i think (and look) at the antirotation plate the more I'm persuaded it should do its job even better than standard slotted washers and nuts that direct hubmotors have on the axle: the contact surface with the dropout is wider and is also acting over a much bigger leverage radius. The material appears to be stronger than usual slotted stuff....the splined/pinned coupling interface is strong and well engineered.....we will see the real world responses soon, and I'm mostly concerned about the regen ability.
SPOKES AND DIMENSIONS
the Flange pattern diameter allows a safe 1cross lacing with near 80° of nipples angle on 26" rims, however the outer edges of the spoke's holes are very sharp. This is not ideal for standard lacing with the risk of damaging the spoke's J-bends and head joints. So after some mulling, I decided, since it's not certainly a trail bike, to lace it (on a 80mm rim) with sapim strong butted spokes, the heads all inside, using standard over cross touch between the couples. (sorry I have not the proper technical lexicon about wheel builds but hope to be understandable), other possible options with this kind of spokes would be to interlace from left rim holes to right hub holes and vice-versa, or modify the outer hole's edges and bend a lot the "inner head" spokes, lacing standard.
Another approach (that will be plan "B" if this lacing job will show signs of failure) is to use 2.5mm quality straight moped spokes lacing without over-cross, so without touch at the intersections.
CABLE EXIT and SLOT ORIENTATION
the phases, thermal sensor and Hall wires come out from a LH side hole that's forced to be in front of the axle when installed in horizontal dropouts....this may be good or not depending from the dropout design. Also, the torque plate SLOT is forced to be in front of the axle in the dropout, not allowing a full deep slide of the axle into the slides, but in fact that sounds reasonable because the forces are concentrated in the slot interface instead of the axle so It should be the deeper part of the assembly into the horizontal dropouts. exactly as is seems projected for.....
LEFT SIDE SPACING
With this motor, due to the mentioned torque plate, it is impossible to use spacers for any purpose in the left end of the axle. could be possible on the RH side but that's not usually wanted.....the wheel results perfectly centered as a front wheel and in fact the only way to dish it is to bend the lower stays obtaining a more asymmetric frame.
the motor plays in another class in terms of quality compared to standard hubmotors, it comes statorade ready, and now has the new better quality exit cables, and the thermistor yet installed. To work with chainlines there is the option to use a slightly dished cog that allows a 2-3 mm right offset.
The brake rptpr pattern is a 4 bolt rohloff standard, but the customer would like to try a front brake only setup (XTR) if the rear regen brake will be noticeable and reliable.
I've not powered it up (just a rapid bench test to check its functionality before to lace it up), SO mines are mostly first impressions and lacing procedures reports, actually, but in the next days I will test it extensively and will share my thoughts and will report log files of these tests from the Unofficial Sigmacom Cycle Analyst android App.
It will be powered by 20Ah 14s samsung cells....
here some first pics....