I would use the 1521 1Y (1577kv), mine does great on 1515 2.5D (1650kv)
I agree.
ratio 4.09
1521 1900kv
12/46
proline badland
16018 7s
16018 is a lot of capacity.
I think that it is 1,521 1Y (1577kv) best fitting.
The mechanical brakes are usable when I use the big pinion in 1521 1Y (1577kv).