Hey, around 1952, there were still companies extolling the virtues of spark ignition over glow...compaines that had excess stock of spark engines to sell. But...if you went down to the field, NOBODY was FLYING anything but glow!
I don't know what the delay was with SWB's Mamba, but, like most others, I feel like they ought to just hide it until they get electric start on it, as nobody is going to be interested. But...to try to tell us that air start is superior, to make up for the shortcomings of their product, is kind of insulting!