Size of outboard hp size for 21 ft carribean

[catfish55]

I have anolder and heavier than the late model Caribbean’s of today, it’s like a reefrunner its 21 ft. in length, and has a rare outboard well , not a pod
With adisplacement boat they do a calculation using information like length weightetc. and can tell you the engine size and prop size you need
Why can’tthis be done with a planning hull?
I’ve had areef runner with a 100 hp. Volvo inboard/outboard before and that JUST and Imean JUST did the job!
I’m talkingabout a new outboard, seems sales people will tell you anything to sell theirproduct, but seems to me to be a guess?
Please anyinfo on similar models, size and weigh too may help
Thanks pat

[ozynorts]

Any more info on the age of the hull? Do you have a model name?

[peterbo3]

There are way too many variables to give you a definite answer.::)::) Boat weight loaded, deadrise angle, centre of gravity, what max HP a boat builder/surveyor will certify for an outboard on a I/O transom & what mods need to be done, extra fuel capacity, what you can afford, etc.
Similar HP outboards will come in at different weights & that is another factor.
The simple answer is to get the MAX HP that is legally certified because you never know when you will need it.;);)
I would think around 200 to 250 HP depending on use. If you are crossing bars or fishing wide then go the max.;D;D

[gruntahunta]

Hi Cat Fish.....I am assuming it doesn't have a Max HP plate any where....I agree with Pete, go the Max.....my latest boat is the only one out of about 8 boats that has had the Max allowed, and is by far the best boat regarding ease of getting out of water etc etc...

Take a look at the plate on the newer 22 footers and use that as your starting point.

[Chimo]

Hi Pat

If your talking older heavier v hull frp boats then the old Vagabond is a reasonable comparison to yours.

The Vag is rated to 230HP ie two 115HPs and fully fueled it tops out at around 42 43KN with a fair bit of punch thru the rev range. With yours IMHO around 225 HP in a single would give good results and good economy too.

Cheers
Chimo

[catfish55]

There are way too many variables to give you a definite answer.::)::) Boat weight loaded, deadrise angle, centre of gravity, what max HP a boat builder/surveyor will certify for an outboard on a I/O transom & what mods need to be done, extra fuel capacity, what you can afford, etc.
Similar HP outboards will come in at different weights & that is another factor.
The simple answer is to get the MAX HP that is legally certified because you never know when you will need it.;);)
I would think around 200 to 250 HP depending on use. If you are crossing bars or fishing wide then go the max.;D;D

Thanks peterbo,the best I can compare is a reef runner , Caribbean and the only info I can getis max hp of 200 hp , now most thesewere inboard/outboard, very few with an out board well. I should put it overthe scales without a motor on her

Apparently had a 200 opti on before
I was looking at a 175 opti or a 200 new late Yamaha weighs only 227 kilo's
Trouble is the massive difference in price ones 18k, the other is 24K that’s a lot of good electronics I can put on

[catfish55]

like I say, oznort late 70's 80's

[catfish55]

mercury 175 ????? 18k
yamaha 200 4cylinder weighs only 227 kilos, 24k! 7 grand difference , pays for all my electronics . understand my dilemma
still don't want it underpowered either ????

[FisHard]

Depending on how you use and ultimately load the boat, you could possibly get away with a 150 if propped right. But if you load her up, it's going to struggle, do a 200-225 would be sweet if you can stretch the budget that far.

[ozscott]

My mate has a nicely done up 70's/early 80's Reef Runner. He had the 3.8V6 inboard initially and then upgraded to a new 5.8 Magnum MPI Chevy Mercruiser fuel injected...off the line it is not that much different but top end is now about 70kph or a little more versus 50kph before. It also holds the plane better with weight - more torque. My 115 Yammy V4 2 stroke on my Vagabond (single motor) still flogs his boat off the line and for the first 100m or so and then he slowly winds me in and shoots past - my top end is 62kph and his is about 10kph faster. His is a heavier boat with a destroyer style hull shape.

I would have thought a 250 would be the go - anything smaller might feel a bit underwhelming.

Cheers

[Chimo]

Lead foot Oz!

[PROS]

Hi Pat,

Sounds like I got a similar boat as well.
Love to see the pics of your Caribbean.

The hull will most likely be rated to 200hp.

To give you an idea;
Mine has 130hp later model 2st Yamaha.
Does about 1.2km/l with 3pob and full gear with 80lt live bait tank full all the time.
Top speed is 70km/h, cruises 35-40km/h

130hp is gutsy enough on 2st, love to have more obviously.
When I was looking in to purchasing, I have seen the same year hulls with very old 200hp 2st.

Max

[ozscott]

What model Caribbean is she Max?

Cheers

[Horse]

A mate had a 175hp on an older refurbished Reefrunner and it performed well

[ozscott]

Yeh I suppose it's the old case of out boards having more go per hp than inboards.

Cheers

Sent from my GT-I9300T using Tapatalk

[PROS]

What model Caribbean is she Max?

Cheers
Not sure really, 80s model that had a recent transom and floor replaced.
Bottom is freshly painted, waiting for me to paint the top, project for April.

i think boat was located in Cairns before, possibly diving op

[The Woo]

If it's an old original Reef Runner from the 70's/80's, she's a heavy boat, with a fairly steep deadrise - therefore she wants horsepower.
Remembering back then a boat that measure 21ft was called a 21 footer, these days they call many of these same boats 20% larger (so they can charge more for them!)
Anyway, I digress....... I'd choose an absolute minimum of 200hp in a modern 4 stroke outboard. The Reef Runners typically came with 305cid Mercruisers in their day, offering 205hp-225hp but lots of torque due to larger capacity of 5 litres.
IF it has a hp capacity plate on it, go for the maximum. If its pre-plate, put a 250hp on it.

[catfish55]

thanks guys

[catfish55]

A mate had a 175hp on an older refurbished Reefrunner and it performed well

encouraging horse , wont ask why they call you horse! have you been on It , does he still have it , would luv to cha with him?

[catfish55]

max thanks for the picks , I have to go to photo school first before I can post some , will do but
mate more like a reef runner with a aluminium hard top, very interesting to know your handles a135 but !
thanks or the input!!!

[PROS]

thanks guys
any pics of the boat?

[catfish55]

If it's an old original Reef Runner from the 70's/80's, she's a heavy boat, with a fairly steep deadrise - therefore she wants horsepower.
Remembering back then a boat that measure 21ft was called a 21 footer, these days they call many of these same boats 20% larger (so they can charge more for them!)
Anyway, I digress....... I'd choose an absolute minimum of 200hp in a modern 4 stroke outboard. The Reef Runners typically came with 305cid Mercruisers in their day, offering 205hp-225hp but lots of torque due to larger capacity of 5 litres.
IF it has a hp capacity plate on it, go for the maximum. If its pre-plate, put a 250hp on it.

say woo mmm no plate mate so how do you go putting x hp on the back .
insurance company these days look for any reason not to pay

[catfish55]

any pics of the boat?
its away getting windows fitted been awhile hope t have it back tis year hehehe when I do, I'll take some picks and post them