What are the purpose of these and could they be utilized on tunnels?

Jeffmaturo · Apr 3, 2018

What exactly are these cut outs called? Steps?

What is their purpose and could they be used on a tunnel?

Steven Bryant · Apr 3, 2018

I’ve got a tunnel with steps on it, not sure of the make but think it might be H&M

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Wally Marsh · Apr 3, 2018

I believe the 7.5-11 class HTB tunnels use a single step(s). Most catamarans also use them - as your pic shows. They are used to break the water tension on the bottom riding surfaces so the boat can run more freely, faster and better handling if set up right. They are not allowed on monos in sanctioned racing.

MarkScott · Apr 3, 2018

HTB-290 has them, believe the Bandit boat I had them also.

Jeffmaturo · Apr 3, 2018

MarkScott said:
HTB-290 has them, believe the Bandit boat I had them also.

How do the tunnels run with them?

Stephen Ecuyer · Apr 3, 2018

they are air slots, lets air get between water and bottom of boat to help free up the hull

Stephen Ecuyer · Apr 3, 2018

My HTB290 runs great with them

Kris Flynn · Apr 4, 2018

Lets ask the proper question, has anyone done proper testing to see if they are of benefit or not?

The lynx has a 'step' in the non-trip which is using a similar principal IMO, that boat works well.

Grimracer · Apr 4, 2018

Steps or vents.. not the same thing..

Grim

LohringMiller · Apr 4, 2018

There's an article on this and other types of planing surfaces in the NAMBA Propwash.

Lohring Miller

Mark Poole ModVP · Apr 8, 2018

I believe NAMBA has a rule that limits how deep they can be.

What are the purpose of these and could they be utilized on tunnels?

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