Had some luck with this bet: it's a 4-5 numbers bet. As we all know numbers hit in clusters on the wheel very frequently. This bet takes advantage of this phenomenon.
trigger: wait for 3 numbers to hit within a sector of 5.(on the wheel, during the last 10 spins) Bet that 5 number sector for 7 spins or until a new trigger appear, (if a new trigger appear that one is bet and +1u bet).
if 3 numbers hit next to eachother, those two are bet and 1 neighbour; (4 numbers bet for 9 spins or until a new trigger appear).
each trigger is bet again after a hit, until a new trigger appear or the trigger is lost. (bets may be adjusted after a hit)
progression +1/-1. +1u bet after one trigger is lost, +1u bet when a new trigger is bet (while betting a trigger) -1u when win, reset to 1u bet when reach a new high.
I don't know about the progression, it tends to get out of hand very easy..... if someone has better ideas about progression, that's welcome