Exactly the video I was looking for!! Thanks! My wife is always talking to her friends about shaft length. I sent her this video.

Direct and to the point.

Thanks for putting this video up. It was exactly what I needed. I am putting a new/used motor on my boat. Now I have to go get the tape. Thanks again!

Great video! Answers my question without a 20 minute buildup! Lol

If your motor is sitting 1 to 11 inches too low, you should look up manual jack plates. "On the Fly" brand jack plates have a self adjustable circular crank lever for an instant height adjustment up to 11 inches while traveling on the water at top speed. Easy fix for a shaft sitting too low, especially for shallow waters less than 1 foot deep. With the right prop height adjustment, you can increase your travel speed up to 5 mph. The manual self adjustable jack plate is for outboard motors 40hp or less.

Super well explained

i have an inflatable cat and even short shaft was too long. Being an open transom i couldn't raise it any higher, so i moved the floor down an inch approx by using closed cell foam between bottom transom bar and HP air floor instead. Along with an hydrofoil it made a huge difference to slower planing, less banging in chop and tracked/turned just like a car would. Since there was no more prop ventilation i didn't bother cupping prop.

You explain it very well, you'd be amazed at how idiot strikes when you go Marine and for some reason watercraft just brings out the brains in everyone.

Nice simple explanation. Good video!

I thank you so Kindly Sir for giving this information at the right length of shaft should be on a outboard motor & I've just checked the the outboard on our boat it levels up nicely from the outboard plate to the bottom of the Keel I live in New Zealand & the boat I have is a Smuggler 6.20 cabin boat with a F150HP Yamaha outboard Fourstroke Motor I got the boat in 2015 & it only had done 3/4 of an hour on the motor when I got the boat & seeing your video Sir of where the plate should right in line with the keel & it does & so I'm sure that the Yamaha F150HP four stroke outboard motor has been Mounted Correctly & must be a long shaft motor Kind Regards Peter PS I did measure the transom & did it by eye from the plate on the outboard motor & it spot on to the bottom of the keel I Thank You So Kindly For This Information Sir & Keep Up The Good Work Sir

Cool Vid....Simple is smartest. Aint got all day for too much esplan'n of why this and that, when u have a motor to put on and business to attend too. *Jack plates are needed to adjust heights when your motor is too long of shaft which some made adjusting simple.

Straight to the point. I love you.

Thank you it is very clear infos. Now I can properly installatoon

Crystal Clear! Thanks

Su I got a lomng shat johnson motor on an aluminum john boat gtypfr motyor kis it bezst to find a shoryrer shaft or wkiden the transom since the transom is looking like itr needs an upgrade anyway as its an old boat but it doesnt leak and upi copuld possibly ad a mpyor with more horsepower but the hJohnso is a pretty good notor though only a 15 hp and very reliable an d fixable locally as I may add a few things flooring and carpet.

Thank you so much!!

Perfect fit- tape measure is on a 15 degree angle.

love it thank you

Very helpful. Thanks!

Thanks for a very helpful video. And straight to the point. Awesome !!!!!

Hello, are you familiar with the Pelican Bass Raider boats. They are basically a tunnel hull style boat. So my question would be how to measure that style??? Do you try to measure from transom to bottom of pontoon??? Thank you. Great informative video.

Same if you're using a bracket?

Great Learning Video

Great information. Thanks!!!

Thanks Brother,,from Malaysia

Hi. I have a couple of questions if that's ok? My transom is 16 inch. Does this mean I automatically go up to 20 inch and get long shaft or is it too close to 15 that I should have short shaft? What issue does this cause if the shaft is too long?

I appreciate the info on how to tell if you have the proper shaft on the right boat but I wish you would point out some negatives or explain what would happen with the wrong shaft on the wrong boat.

good video - thank you

the transom is the furthest aft most part of the boat in the case of your run about or the rear end of the rigid part of the inflatable. Not just from the top of the motor mount to the skeg or aft end of the keel.

thanks for the tip

Very useful thanks

Thank you.

Good job

dear sir , i have 400hp mercury. 3 engines installation project and how to measure transom board distance.

So a 21" transom requires a long shaft?

Mine is 16 inches... Most of the engines I can afford are 16 inches..... Should this work or do I need a long shaft

FIRST LEVEL BOAT- LEVEL ENGINE- MESU BOTTOM OF BOAT, MESU- CENTER OF PERPELLER SHAFT THIS IS THE ADJUSTMENT TO USE LIKE IF 15" - AND SHAFT IS 10 YOU HAVE A DIST- OF 5" TO ADJUST THE SHAFT SHOULD BE 13" SET-RASE UP TO 12" SHAFT - THAT SHOULD BE REAL CLOSE TO THE HIGH YOU NEED TO RUN.BELIVE ME IT WORKS . THEN IF YOU WANT ADJUST IF IN 1/2"" AT A TIME UP OR DOWN

Finally my wife can stop asking

My wife always said my shaft was long enough but i knew better😂

Hi everyone,, i wanna ask you what is the mean of the Transom TDS

It's not a cavitation plate, but an antiventilation plate.

How about a catamaran-type inflatable, like the Takacat? The bottom of the boat will be above water, so do you just guess the ride heigth and make sure the anti ventilation plate is a little below that? Thanks!

Good info - THX a lot for showing... ;)

That title is mad...

Thank you Sir now I understand ... Sir but when I bought old boat they fix their trasom , but if my motor deep about 3"... is that ok... or do I need to high my trasom more 3"????

But why? What happens when using a longer shaft?

Thank you sir... I had the inflat boat with long shaft... it's look exactly in the video you show. Cuz my first time I didn't know much about long and short shaft... my question is, is that gonna work..??? Is that gonna run ok on water...???? I haven't take out water yet... thank you Sir.. please give me the advise ...

What if the measurment is 18 inches? Its a canoe.

I’m looking at getting an outboard for my 13 foot sportspal canoe. It has an 18 inch transom. So I’m in between. Which should I get

I have a 4inch narrow keel that extends to the bottom of my boat which makes it from 20ins to 24ins.which shaft length do you think I would need?

How to fit two outboard motors on hull. Do use the same technique?

Can someone tell me about the stainless steel schaf on 8the front of the motor 9.9 CT where it hooks up in the engine I can't tell

❤

yas.good

we have a 20 foot Carolina skiff and the previous owner put a 90 horse mercury optimax on it with no jackplate . Whenever we try to run it wide open it throws water up over the transom . Would a jackplate solve this problem ? The transom is 20 inches and so is the shaft .

Probably a silly question - I bought a extra long shaft 4 stroke 90hp outboard thinking it was Long shaft, is it possible to use a extra long shaft on a boat which has a long shaft? Just seems a shame and alot of money wasted if I can't. Any help/advice is appreciated. Nice vid btw 👌

Thank you for that explanation, but one question if I may. Let's imagine you have a boat that by design (flat hull) does NOT displace much water, in that case, does this general rule still hold true...OR, could it be that with almost no displacement of water, you might get cavitation in normal running?

Beside the length. I heard that some Engines (100hp+) as Singleengines should slightly be mountes to the right to minimize the Propellermovment. Is that right?

What happen if we use 20inch long shaft obm with 15inch boat ?

OK, so I just bought this Mercury 5 HP four stroke short shaft and I have a 15 in transom. The anti cavitation plate sits 2 inches below the bottom of my boat. Making it a 17 inch shaft. Is that possible?

I have a 2.30m inflatable I found a very nice 9.9 hp 2 stroke engine but its long shaft I want to have it but will it be a big mistake or will be fine ?

Hello Pete, where can i get Hidea 6Hp 4stroke manual owners in spanish please; cheers Guille

My transom to bottom of boat is 16-1/2 " can i use a short shaft 15" ?

Hey dude, is there anyway you would put a kicker motor on your boat on the cutout transom or would you mount it to the back using a bracket? I have a similar design and I'd rather be mounted to the real transom at the cutout than Mount with bracket on the right or left. It's just a what if motor. So it can be stationary. I can steer with the big motor. Do you think it would be too close??? As long as it doesn't hit right?

What does it matter if you have a boat that means a long shaft but you have a short shaft motor how does it affect it

What if your in between measurements....16" or 17"

My transon is 16 inches .. any suggestions

What if your transom is 17”

Over three minutes about shaft length, no discussion about girth. It's all a package for her outboard riding pleasure.

i have a 17.5 inches , thinking of the e propultion , they have a extra short shaft 20.7 and there short shaft is 24.6 what would you recommend ?

My Orkney long liner 16 ft is 19 inch from transom to bottom of boat BUT has a 10 inch deep keel total of 29 inch so, so where should i measure to ? bottom of boat or bottom of Keel ?

Now run a 15" shaft on a 20" transom on the lake and record the results!

Great video but what shaft size or length do you get if you’re at 16” wanna run the shortest option but stay efficient. Thank you

I've been researching into constructing boats and discovered a great resource at Denelle Boat Builder (google it if you're interested)

What happens if the prop is too deep in the water?

I went and measured and re-measured....and I get 17 inches from transom to keal.... what now???

For thundercat racing boat are use short shaft engine bro?

I'm in the process of changing my motor on my pontoon boat. Obviously there is no keel, so do I take the measurement from the top of the transom to the bottom of the pontoons?

Can i increase my inflatable boat’s transom to match my long shaft OB ?

Is it the same for pontoons or do you measure to the bottom of toons

shame you do not know enough about boats to know the cav plate should never be level with the keel. it should be atleast 1 inch higher at minimum.. its very poor advice to tell people the cav plate should be level, this is very old school thinking that was incredibly wrong... when moving along at anything over about 4 mph you can look over the back and see water is creeping up the front of the outboard motor and is causing terrible drag. now if the anti - cavitation plate was higher it would act as a barrier ( exactly what it is designed to do.) and stop the upward surge of water and direct it more towards the propeller. just 2 inches up will lessen the amount of drag the gearcase gives by a huge amount. raise that motor 2 inches to get better performance , better handling and far superior economy.. .

its the motion of the ocean not the size of the shaft :(

And then go and buy a decent motor :-)

That Info is WRONG ! Your Keel should be at the hight of the upper Waterintake! This is a common Problem that the Cavitationplate rides to deep and this gets you a bad Gasmilage! The first Boat need the Plate to go a little bit up so the Plate rides free OVER the Waterline not under the Waterline. Try it and you will see the Difference!

why repeat things three or more times? we're not stupid mate.

I bet that guy has a nice long shaft...😉

Freeze at 1:35. Now draw a straight line from the cavitation plate....that is about 4 inches lower than the keel. If you are going to do a how to video, at least do it properly.

Looks way off to me bud.

bro.....you didnt even say why it matters.......wtf

pescado atún pescado los va tongo

I know a good shaft length 😉😉😉

Should I trust someone who DOES NOT know how to measure properly… with a “basically” “perfect fit”, where I can see the GAP???!!! And you did not bother to say: It needs to go a bit higher yadda yadda… then I might trust your video.