A Photo & Discussion Forum for Wharram Design Enthusiasts
Seems very high from the water to me: you may have to build strong brackets to have them right, then they will be low and get exposed to the seas, unless you have a lifting bracket (what a pain...). You will also lose the fact that when mounted forward, the propellers do not cavitate when hobie-horsing: they are close to the center of gravity. Maneuverability is also better when center mounted.
You will have to reach the rear beam to lift/lower/manipulate the engines which can be difficult and dangerous. A 9 hp Yamaha is 100 lbs...
With the boxes mount, engines are hidden and when boxes and engines are up, lids are closed, you forget about them and not worry about the drag, they have completely disappeared. All operations on them are done safely at deck level and between the hulls.
In other words: I like very much the engine boxes mount on my Tiki38.