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Old 14 April 2018, 12:31   #1
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Another outboard for the v floor Waveline. . . Will it cavitate?

Hade some issues with short shafts cavitating on my high transom v floor Waveline. Just mounted my new Mercury 7.5 I was hoping to use as my back up this season and the cav plate is lining up spot on but I bet it will cavitate like the previous short shafts, the long rear tubes and big planning tabs keep the Waveline stern really high I will give a try though as I like and rebuilt the merc 75 (I think this merc is maybe standard shaft not a short and a few inches longer than what we know as a short nowadays (the merc is a 1973 I believe) I will measure the merc length when I pack it all up later, be great if it doesn't cavitate I will have my backup outboard sorted!

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Old 21 June 2018, 18:48   #2
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Another outboard for the v floor Waveline. . . Will it cavitate?

Well the time has come to decide what to do with this high transom V floor SIB, it doesn't ride well nor right with my trio of thunderbolts: 4.5, 7.5 and 20hp (all standard shaft around 17-18inches, I no longer have the Mercury 25hp long shaft and I'm not sourcing further long shafts for my own use just for this boat) so it's either cut out a good few inches from the middle of the transom or sell the boat, I can't decide. . . (The boat will work with short/standard shafts but not if you want constant speed planning) I like the boat due to the long rear tubes and the huge planning tabs it takes the merc 200 20hp weight (45kg) like it's a two stroke 5hp on their, the boat looks good and has many years left before any reglueing etc. . Is needed, it's a rare boat which I like, the high transom is better for less water over the stern, the huge stern buoyancy means I can stand at the stern with the 45kg outboard and it still doesn't even attempt to want to flip, I like all of the above but none of that's any good if it doesn't keep on the plane in the slightest chop! The negatives for me to be happy to let it go are: Its too small for me to be honest anyway at 2.7m, I really don't like the V floor (not just on this boat but generally I don't like them)
But. . . With the right transom height and the huge buoyancy this may just be a power SIBers dream i.e. It will plane with 3 people with ease in the chop with the merc 20 where as neither the honwave nor sunsport 2.7 V can take the merc 20hp 45kg weight like this SIB can!

So what's the verdict. . . Let's have a poll!


1: Chop the transom, try it out and then if it doesn't give the desired 3 person hyper planning at least it will take a short shaft for the next owner, the only downside with this is that it's no longer original although the chop will be professional.

2: Sell and get a brand new SD290 too use with my trio of mercs.


(if I sell it my replacement will ONLY be a new red excel SD290, so no other boat recommendations please in your poll decision please! And I'm now a merc thunderbolt enthusiast so no other engine suggestions also lol)
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Old 22 June 2018, 04:15   #3
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Have you considered selling 2 or 3 of the engines and getting one 20hp with a longer shaft ?
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Old 22 June 2018, 04:23   #4
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.......although the chop will be professional


Will you have to send it off to get that done, or will you find someone local to do it?
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Old 22 June 2018, 06:08   #5
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Id say cut the transom, 95% of sibs that size will be standard shaft they dont need to be long shaft and for most owners its far easier to fit a short shaft in the average car boot. I've always found long shafts tend to be just too long to fit across a car boot
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Old 22 June 2018, 06:17   #6
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It just seems odd that it would be manufactured with such an obvious defect. Does the boat actually stipulate that it is built for short shaft ?
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Old 22 June 2018, 06:32   #7
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It just seems odd that it would be manufactured with such an obvious defect. Does the boat actually stipulate that it is built for short shaft ?
To me, the SIB in the photo looks like a perfectly normal 10' tender with a bog standard short shaft egg whisk on it.



Lee uses the term "Standard" for both Short and Long shaft so unless he actually measures the bracket to antiventilation plate and the transom height, it will be difficult to call it from photos etc.

IMO he should definitely have a professional cut the transom down a few inches and report back later with a full analysis...
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Old 22 June 2018, 14:45   #8
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No I use the term for stand shaft for the older engines like thunderbolts sea horses etc that are now referred to a short shaft there are around 17/18 inches the later actual short shafts are 15/17 inches long shafts are generally referred to around 22 inch and extra long 23 plus so where does that leave the 17/18? . . . . Standard shafts!
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Old 22 June 2018, 15:58   #9
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No I use the term for stand shaft for the older engines like thunderbolts sea horses etc that are now referred to a short shaft there are around 17/18 inches the later actual short shafts are 15/17 inches long shafts are generally referred to around 22 inch and extra long 23 plus so where does that leave the 17/18? . . . . Standard shafts!
You are deeply confused. I'd suggest you swat up on the subject a bit. All IMHO naturally.

Tell me a thingy - those "long shaft" motors on your thundercat thread... were they REALLY long shaft or had a professional with 25 years experience in small boats simply misidentified short shaft engines? It's a really basic spot and you totally missed it. You've carefully avoided admitting it since, but IMO it's the mark of man if he can admit his mistakes - God knows I make plenty myself.
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Old 22 June 2018, 17:11   #10
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No that wasn't any of my thunderbolts that was a Mercury long 25hp but as were no talking about another subject that was in another thread then yes the thundercats don't have the cav plate in line the transom bottom do they
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