Sponson angle

[Gary]

I have a question on sponson angles on a Hydro Boat .....not the angle front to rear but the sideways angle thats touching the water. My boat shows a slight angle up to the outside when it sits flat on a table. My old Hydro Larsony hull had two diferent angles.......... .one flat and one on a angle. For SAW runs would you want it flat to the water or a slight angle. I would think the angle is for turning better. Hopefully i am explaining this correctly.

[Ub Hauled]

AKA Dihedral angle
that's what the higher outside of the sponsons is called...
yes, it helps to turn but it also diminishes the contact on the water (when it touches).
I am not sure if flat or angled would work better for SAWs I have been using stepped flat for SAW and slightly angled for oval.

[crabstick]

Hi Gary, that is referred to as Dihedral.

For SAW my thoughts are you want them flat. For oval racing the inside one can be flat and the outside a little dihedral... Thats how the whiplash comes.

[RandyatBBY]

For Oval racing I like about 1.5 degrees of Dihedral on both sides. Some boats you can have less on the outside if the anti trip is good. For SAW I like it Flat. But I ran 70MPH with the Zephyer on 7.4v and it has 1.5 degrees of Dihedral on both sides.

[Gary]

Thanks guys. Im only asking because since my SAW Hydro took a terrible tumble at 97mph im swapping everything over to my backup hull and while setting it up next to the other boat i saw this. I think since the new hull has one flat and the other slightly angled the the sponsons them self are off compared to the original hull......there both at a slight angle and the new one is not, one flat the other angled.