Kendall

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bobeast

OR....don't try to turn at 30 MPH in 6 foot waves, and then blame the boat.

1breakinit

i have a tunnel hull that has a similar characteristic, very fast in a strait line , can turn very well at speed on predictable water , 'BUT" add a freak wave or a unpredicted boat wake and it will try too and will abruptly spin., when it does it stays flat which is a bonus.
. ..
the characteristic is easily controlled by powering up and letting the tunnels create lift in the center of the hull where the tunnel's are, at first it will scare the shit out of you and you tend to naturally back off the power ,"wrong" this will allow the air pocket created by the wave or wake to close .
it needs a slight step off the throttle and then planted to full using the HP of the motor to lift the hull too keep that pocket of air under the hull , once there is a vacuum ,like is posted above with the step hull, the hull sucks down and grabs the chine and will naturally spin the boat to whatever side is deeper in the water..
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I'm guessing that this same procedure could be transferred to the "step" type hull and would avoid that nasty spin out,.
probably not as simple since most of the CC s with these "step hulls" have have auto pilot or are controlled with lever or other means that would make it hard to plant the throttles in a situation .

30Concept

Step hulls in the 70's and 80's? I know the idea was used a long time ago, but what production builders were making them in the 70's and 80's?

The cliff notes version of all this is don't adjust your trim or tab settings in a turn with a step hulled boat.

nevets

Actually the Invincible hulls were designed by Mike Peter's to protect against this with the vertical sides on the "tunnel".

slickster

Nothing is anybody's fault anymore....

Riptide

PSA #173, Thank You for that. Kinda sorta similar to the dreaded, “snap roll”......

lurker25

Video of dreaded 180° or it never happened.

Cobia 217

Calling Morgan & Morgan.

Kendall

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Tritanic

Hustler in the mid 1980s. Think Fountain came out with steps soon after.

Hustler Powerboats- History

Boat Hound

Step hull certainly have their place, but I am good. Not for the 180 thing, more that around here you being able to plane at lower speeds is more desirable than top speed / fuel savings.

Reel Fas

I asked the question whether a center console could hook a year or two ago. I guess this answers that question.

walknazty

Never noticed this before. Look at the throttles after the lady slams into. Mangled.

lurker25

Haha I was being sarcastic but I forgot about this video.

alloyboy

But if it is, it is usually someone else's fault.

Daven917

This explains the “u-turn” at high speed in the other thread. As a former speedboat owner, this loss of traction from venting was pretty well known with boats regularly hitting 80+mph. See offshoreonly.Com for more. Anyway, with often lower speeds of fishing oriented boats this is a bit lesser known. Really sad. RIP.

Wickedfisha

While anything is possible with a step Iv never experienced anything like this in running a 36YF since 2014. Don’t be an idiot on the water and you won’t/shouldn’t flip a boat over. Your freeman is stepped so will it do a 180 on each sponson? Then break in half? Probably not but cats have broken apart before and they still make amazing boats as you’ve been able to see for yourself. Iv driven that YF from 75 miles deep with the throttles to the dash the entire way home and motors trimmed up to a reasonable level. Boat never did anything remotely sketchy and nobody got ejected.

Kendall

Josh, trimming the motors up is the correct position to prevent spin out in a stepped hull. The more motors trimmed up the less likely for air to get blocked allowing for hooking and spin out.

30Concept

Perhaps, but a 40' Hustler is hardly a production boat. A friend of mine had a 1992 32 and it didn't have steps. Here's a 1993 Fountain, no step(s). https://www.boattrader.com/boat/1993...riple-6886914/ Most manufacturers didn't have them until the mid-late 90's. Then, all the sudden everybody had them.