Outboard Brand

[fisheye]

You are absolutely right sirena the reasons are that you can  haul a dinghy to the sea from any slipway even if the sea is rough to the point that other fiber speedboats can't be  hauled. The second is that they are very safe in rough weather and still can go very fast and I am saying this because I had some personal experience with dinghies in rough sea.

[sirena]

i said so cos i used to hunt long time ago , i know what it fels like at nw force 7 in ghajn tuffieha . nowadays its different nore regulations etc erc,thats why i changed my hobby completely, and by the way,now  i do have my own family so.....

[fisheye]

yeah same story here although I used to be more on the north to south area and some times in the channel for some good time but as soon as new rules started to pop up I quit.

[fabrizioviper]

king i would not buy any boat if used for hunting , why ? cause they will have used frequently and roughly. surely they would have taken the crap out of it.

[King]

grazzi fabrizio u kulhadd, sewwa qed tejdu, issa naraw niltaqawx ma wiehed iehor

(Translation)

Thanks Fabrizio and everyone, you're all right what you're saying. Let's see if we'll encounter with another one

fishfinder

[salmon]

Hi everyone,

I have a 15ft Kaptan open (WITH GABUS) with single 50hp Yamaha 4-stroke (110Kgs) and now I bought an aux 15hpYamaha 4 stroke (52kg), In the meantime I am not happy with the main motor speed (with the Aux install) so I am thinking of changing my main motor and go for a 100hp Yamaha 4 stroke. My boat one day was with twin 2 x 50hp 4-stroke (2x 110Kg =220Kgs) but I bought it with one. Just to let you know the extra stuff are two to three people, Battery, 2 Fuel Tanks 96L + 25L and other fishing stuff.

@ FishFinder could you please tell me what is your average speed and the top speed in Knots with your 115Hp and do you have an aux installed?

Can any one help me to choose my new engine?

Thanks a lot for your help.....

[busumark]

it depends how far you go out fishing. if you go out more than 10 miles i would buy another 50 hp if no i would buy a 100 hp with the 15 hp aux.  regarding weight there won't be much difference between them

[shanook]

As busu said i rather have 2x 50 hp each than a 100hp. Its true more expenses but the safety factor is there is u intend to go  FAR FAR AWAY

[skip]

If you want to save weight on the transom which a lot of people certainly do, I would have a good look at the new Evinrude ETECs, especially the 130hp model which just came out, or even the 115hp. Darius from RLR can guide you accordingly. Similar engines would be a Mercury Optimax.

If you're going down the 4 stroke route, the current market leaders are Suzuki and Yamaha/Selva

Do your research, compare weight of engines, local prices and local dealer support before deciding. I would also speak with the boat builder Kaptan to see if any of their 15 footers have engines  you would be considering and to cross reference how they perform.

it depends how far you go out fishing. if you go out more than 10 miles i would buy another 50 hp if no i would buy a 100 hp with the 15 hp aux.  regarding weight there won't be much difference between them

On the other hand I would NOT go for twin outboards unless the boat is capable of running at a reasonable cruise speed with similar consumption on ONE engine. Otherwise all you have is a large expensive auxillary engine where you can acheieve the same by using one larger primary outboard and your current 15hp aux which will give you a similar speed to 1 working 50hp. The weight of 2x50hp will most likely be more than 1 single plus Aux especially if you are looking at 4 strokes.

People keep making the mistake that twin engines are the answer to all your problems!! They most certainly are not unless you go out of your way to have a truly redundant set up - Separate battery, separate fuel tank, filter and fuel lines for total redundancy. You have to look at the reasons why an engine might stop (which tend to run with fuel issues first, then electrical) and finally mechanical faults. As those on the forum will know I am a firm believer that if the boat cannot perform on one engine to get you home, twins are a waste of time and money

[redhead]

Amen Skip. I am getting a new e-tech on my boat to replace 2 inboard diesels.

[busumark]

skip is right in saying that you have to have 2 fuel tanks and two batteries for a twin engine but even with a big motor and aux you still need two batteries. even if i have one motor i would still do two batteries. the difference in weight of the motors between the two setups will be about 10-15 kg more with the twin motors. so the weight is not a big issue.

with a 15 hp aux  you will do maybe 5-6 kts in calm sea but in a choppy sea and headwind it will go down to maybe 4 kts and you will not have good control of the boat. it is good for going out 10 miles but not if going further out.

with a 50 hp you wont do much more than 6-7 kts because the boat is not on plane but if you are in a choppy sea and going headwind you will still do 6 kts and have more control of the boat and this is good when you are a bit far away from land.

The best thing is to have 2 motors and you can plane the boat with only one but it will be a bit expensive.

[skip]

Busu you raise some very valid points about the increase in current/wind in terms of power to keep up the speed, but at what fuel burn?

More control with twin engines is only achieved with counter rotating engines and these don't tend to be available in 50hp. I would disagree that a 15hp would only push a 15 foot boat at 6 knots. My 9.8hp 4 stroke pushes an 18 foot boat with 100L fuel, 40L water and I'm not small! at 6.5 knots at 3/4 after I changed to the correct prop so a 15hp with the right prop should give you the max hull speed before planing with no issues whatsoever even when the wind picks up a bit.

[bigboy]

I am not a fan of twin engines!!!

if dealing with outbords i would go for a big motor which can get the boat on the plane with not much power and with little consumption and then having an aux which can push the boat say 6-7kts.

As for inboards id say one good engine as a main and an aux outbord at the back

[Jonathan]

Seeing that Skip referred to hull speed, we have to keep in mind that this is a very valid point and the smaller the boat the less the hull speed. There is a specific formula for calculating hull speed which is: Hull Speed = 1.34 * (LWL)^1/2, where LWL is the length of the waterline in feet.

This means that for a waterline of 15 feet (which is usually the case for boats of a length overall of around 16/17feet), this means that hull speed would be around 5.19knots. It's generally easy to push a boat up to her hull speed but over this you need much more horespower as the boat will start digging into the water and creating a lot of wake, before going on the plane.

If you would like to check your boat's hull speed, you can check out the following page:
http://www.sailingusa.info/cal__hull_speed.htm

[malvizzu]

@redhead - my friend you won't be disappointed at all. If the ETEC you'll be buying is as fuel efficient as my 50HP ETec you'll be more than satisfied in the end. I found out this summer that my 50HP ETec on a Fastfisher 14 Open is by far more economical than my 9.9HP Mariner 2-stroke on my previous 13ft frejgatina. Initially I was sceptical about it but I found out how economical these ETecs are. Another great added bonus is that in Darius of RLR you will find an excellent gentleman with fantastic aftersales.