Boats Brackets Engine Height EQUAL PORPOISING!

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[Fireship]

The through hull fittings installed to break the vacuum in the trim tab pockets was a slick idea. I love this channel because it’s chock full of slick tips like that!

[DJSbm-]

Never had this problem. Always knew that the engine needed to be set just right. Always had someone like you to make sure that it was done right. Great information always a pleasure to see what you are doing. 👍😎🌴 Stay safe out there.

[joemcky]

I really enjoy your clear matter of fact style. Ive watched you and been subscribed for many month's. I live on Casco Bay in South Portland Maine. My 1998 Honda bf90 threw a connecting rod through the crankcase cover last November. But it never died as I watched its oil pump out it still idled me a mile or more to the ramp...I had no choice.
My wife and I traveled to Marathon last month and stayed at the Jolly Roger RV park. I was so surprised to see your channel say that week I was so close to your Marina. On the way to Coco plum Beach I stopped in to say hi and see what you might have to replace my beloved Honda but you were closed 2 times I came by.
Anyway I like your shows! Very clear! Thanks very much.

[cleatusbarncoat]

In my experience, a hard overhead roof or soft Bimini top can also contribute to the porpoising, especially if cruising into the wind and waves. One of the many reasons that I love boating, the frequent adjusting to the conditions. Thanks for another great tutorial.

[johngjacobi]

Wow...never knew that about the tab pockets....you are a master of your craft sir

[techrfun]

Don't know how I missed this episode. Great information. My Simmons Sea Skiff has a hook on purpose. Originally I had a 70HP Tohatsu that had issues. I didn't trust a 2stroke. I repowered her with a Suzuki 60. I learned about weight distribution and she don't Porpoise no more. Alleluia. Great info, thanks

[markkaren]

Thanks guys for your content, Yes I've experienced porpoising effect, my father years ago built a bondwood boat, cabin cruiser 20foot and he decided to increase the cabin size by lengthening the aft (of the cabin not the hull) one foot. This stuffed up the balance of the boat, hence fuel and water tanks forward extra anchor chain and a refit to the cabin layout. It was a nightmare and lesson learned.

[jmfut]

Great information. One of the best channels on YouTube. Always learning something new on a Tuesday!

[shingnosis]

The porpoising typically happens inside of a speed range and under certain load conditions. For instance we have a pretty fast twin engine boat with a bracket which tops out well over 70mph, but under light load conditions it nearly always porpoises between 45-50mph. This is the speed range in which it begins to lift the hull out of the water and outside of that speed range it runs perfect, but inside that speed range it's unstable. Adding a few passengers to the front of the boat moves the speed range up by maybe 5mph etc. What we have is an old school "straight hull" and it's fun because you can vary the angle of attack a lot with the trim, it runs great you just have to know how to drive it. I guess the modern solution to all this is to add steps and then boat will have the same angle of attack almost not matter what you do with the trim, and no porpoising. But honestly I like my old school hull, it's fun to play with the trim and it's as fast as anything once you trim her up and open her up. But basically if have porpoising problems start with moving the weight around, you're either going to want to make the nose heavier or lighter and then play with the trim. Offshore the easy solution is typically to add more weight in the front.. but it's going to run wet. Probably.

[RedVMember]

Thank you, your videos are always so helpful and informative.

[randylewis]

This was the most excellent simi technical explanation of hydro physics real life functions I have ever heard concerning this modification. I have been considering a repower on my 77 SeaRay 24ft sedanbridge.

[ronwallace]

MATHS are hard. That is why I prefer hillbilly also probably explains why my last two boats are at the bottom of the lake! Thanks for posting!!!!

[jonnyglez]

Súper helpful this video I learn something new today, those hole in the back are made it to release air and let the boat get on plain faster, interesting 🤨 thanks for the video 👍

[russwilkerson]

I remember the good ole days. I didn’t have to worry about brackets, trim tab pockets, four stroke motors, they didn’t exist. Trim / tilt was advanced !

[OfficerDave]

A lot of good info in the episode. My old boat used to porpoise awful if you had any weight in back of the boat and tried to trim. But my new boat is pretty good.

[pieterhoekstra]

Thank you for sharing this knowledge guide. As you correctly pointed out, the height of the cavitation plate is more crucial than many boat owners are aware of, however it would be of value to your viewers to give a specific measurement as there is a rule of thumb that can differ when say comparing a deep V to a cat. It is also of interest that a slight bit of toe in specifically on cats can make a huge difference to the steering and performance of the boat. You can make this a whole separate discussion point with a panel of experts.

[ermannodibenedetto]

I would really like to work with u.... and never end learning...

[SaltyBoysFishing]

You guys are so awesome and an inspiration to our channel! Your videos have kept my boat running!

[dsafradin]

Thank you! You've just saved me thousands of dollars on my planing issues with my 27 Whaler, by adding the vent in the trim tab pockets!

[cmacedo]

thanks, great video, keep posting more about height of motor on transom