Yep, you just need to find the point where the force of the prop is just less than the strength of the magnet so it wont slip in the housing. I bet the ones made are already pretty close to maxed out though. Maybe not.
The reason that I wanted to have a larger prop was to make a wider flow pattern. Could power be sacrifised for a wider/more diffused flow pattern. I would think that a revised shroud would fix the start up problem of a larger prop. Does anyone have a link to somewhere online where I could get a wider prop then the Dumas 3004?