Hadn't seen the videos, so thanks for that they are great. Loved the 'hey dad you are too far away' and ' I'm running out of battery'.

The only spray I could see was fairly well aft and under the wing, you won't know for sure till you fly in a bit of rougher water, but it looks pretty good to me. If you do have to go with spray rails keep them as far aft as you can get away with, if they extend too far forward they may reduce directional stability in the water.

I think from memory that you kept the incidence angles and balance as per the original? In that case the small amount of down elevator that I saw as you taxied in on the first video would be due to the original pylon mounted engine design. The high thrust line coupled with the low drag line would have required a small amount of up trim to trim out. Lowering the thrust line as you have means the required elevator trim is now further down.

I have just realised that my comments about trimming the up and down thrust won't apply to your model very well. They are more applicable to a conventional model with the engine well in front of the wing. With your engines only just in front of the balance point you would need large amounts of thrust angle change to see any result. I don't think you need it any way.

Also be aware that if you move the balance point around you will affect the relationship between the hull step and the balance point, you will potentially affect the water handling.

You might want to do the first series of tests to see where you think the balance is out of interest, but if you have kept the original incidence and balance you will be very close. The model certainly looks like it flies nicely and you seem fairly happy with it. Looks like a very successful experiment to me, but then again I'm a sucker for twins and water planes.

Well done

Dave H