Hmmm what distance to mount arneson drive plates from trailing edge of sponson...

There was a question asked by me in my thread about the build over in Rum Runner forum about where exactly the arneson drive plates should be mounted on the backboard of the sponson's.
How far above the trailing edge of the last step should it be?

I reasoned that it should be 2mm above so as not to disrupt the water as it leaves the trailing edge. But I have been told by others that it should be flush with the bottom of the sponson based on Achim's setup which did a stunning unofficial 184Kmh but I feel that a lot of that had to do with the power plants and not the tuning. The real test would be to have two identical setups in terms of Motors, ESC's, Props and batteries.

Meantime Hanspeter has gotton back to me recommending a distance of 1mm between the bottom of the sponson and the botton of the drive mounting plate and this is what I will do.

Pictures to follow.