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lesson on twin stepp take off

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Old 03-29-2009, 06:53 PM
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Originally Posted by US1 Fountain View Post
A friend had a 34' PQ that also has the 2 large steps. His drives had spacers on it when he bought it. Possibly for this very reason?
like on reply#32 the bravo drives come with a spacer,the only difference is the location of the spaces,front or behind the ram bolt, on bravo 1 the spacer is located in front and on bravo 3 the spacer is behind,mine where reversed,wont know if thats my problem until I go out again.

can you think of a reason why your friends were reversed?
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Old 03-29-2009, 06:55 PM
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[QUOTE=omerta one;2831857]
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Originally Posted by 4mulafastech View Post
The reason is if the drives are tucked 'too' far at speed in a hard turn, it is more likely to spin-out/roll a twin stepped hull due to the added stern lift. I never have my drives tucked all the way in when turning (rule #1 of driving a stepped hull). QUOTE]

The drives should not be trimmed below level when turning at speed...period.
great info thanks!

how do you find the neutral position on the outdrives on a boat?
do you start by leveling the boat trailer and then level the outdrive cavitation plate??
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Old 03-29-2009, 07:22 PM
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Level the drive with the bottom of the boat and mark your trim indicator with a piece of colored tape.
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Old 03-29-2009, 07:40 PM
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Originally Posted by omerta one View Post
Level the drive with the bottom of the boat and mark your trim indicator with a piece of colored tape.
Just so I do this right,
the boat has a pad,do I take a long 2x4 or level and have 3 to 4 feet against the pad and level that to the cavitation plate on the outdrives?

and on turns never trim lower then that neutral position??
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Old 03-29-2009, 09:36 PM
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Quote:
Originally Posted by boatnt View Post
like on reply#32 the bravo drives come with a spacer,the only difference is the location of the spaces,front or behind the ram bolt, on bravo 1 the spacer is located in front and on bravo 3 the spacer is behind,mine where reversed,wont know if thats my problem until I go out again.

can you think of a reason why your friends were reversed?


No, I wasn't clear. The spacers were between the upper and lower housings, to put the prop in deeper. I think they were only 1" spacers. He never had any blowing out like you are experincing, so I'd have to assume the 1" spacers did the trick.
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Old 03-29-2009, 10:21 PM
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Quote:
Originally Posted by boatnt View Post
Just so I do this right,
the boat has a pad,do I take a long 2x4 or level and have 3 to 4 feet against the pad and level that to the cavitation plate on the outdrives?

and on turns never trim lower then that neutral position??
Long 2x4, forget the pad, just level with the longest portion of the hull before the pad.

Do not trim below that when turning at speed.
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Old 03-30-2009, 09:02 AM
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Originally Posted by omerta one View Post
The drives should not be trimmed below level when turning at speed...period.
Yes, agreed. Thanks for clarifying.
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Old 03-30-2009, 09:14 AM
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Originally Posted by RollWithIt View Post
The sales guy said they were to venitlate the props.

But he made it sound like they provided air to the props so that the motors could get them rev'd up.
That's what he meant by "ventilate". Race boats have been using them for years.
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Old 04-04-2009, 07:58 PM
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update
Ok I switched the trim limit blocks to the front of the trim cylinder bolt as it should be on a Bravo 1 and took the boat out for a ride,much better,
all I have to do is accelarate to 3200 rpm and planes out pretty good,

Thanks for all the help!
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Old 04-04-2009, 11:31 PM
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Boatnt,
Probably won't tell ya anything you don't know but....

Last year I bought a '02 340 PQ with 496HO's and 28 B-1's twin step. I was having quite a learning curve coming from a single 330 Bravo with a 23P.

Two things that helped me:
Drives down deep and full tabs. As she starts to nose back down and come on plane, I trim the drives and lift the tabs.Feels like something kicking it in the azz.
Secondly, I just raise the rpm's to about 1200-1500 for 10-20 seconds to get the speed up a bit while the hull is still in the water, Before I really try to get it on plane. But Yeah, If trying to get it on plane over 3500 RPM she'll blow out.

Just by getting the hull speed up a bit before take off makes the tabs full down less required

BTW Beautiful boat and congratulations!! If ya make it to Northern Lake Mich give us Charlevoix / Boyne guys a buzz.
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