Whaly/Fun Yak Boat - Exceeding Max Outboard questions

Marcevo190

Hi All,

I'm very new to the world of boating so this may be a novice query.

I'm very close to buying a Whaly435 (preferably R model) or maybe a Fun Yak Sec 15.

Having reviewed the performance of each I note the max outbaord for both is between 30hp-40hp. Using the Whaly435R in tis example - with a max outboard rating of 40hp - what concerns/risks could one see if an outboard rated 50-60hp was mounted? Structurally these boats are supposed to be near indestructible so with a reinforced transom I can't see any real risk there.

Would it simply be a weight of engine issue? Or is it safety due to potenital handling of the boat at speed

Thanks in advance,

Marc

fergal.b

It's all down to safety and in many different ways, if a bigger engine is put on the boat could sit deeper in the water causing a backwash to come into the boat when you slow down, the boat could now be top heavy and roll when turning at speed, the transom might not be able to take it, it could be unstable and I'm sure there are a lot more reasons, also you will void the boats warranty and insurance and any legal responsibility if an accident did happen would be on your head. :eek: Best thing to do if you need more power is to buy a boat that can take it






.

Marcevo190

fergal.b wrote: »

It's all down to safety and in many different ways, if a bigger engine is put on the boat could sit deeper in the water causing a backwash to come into the boat when you slow down, the boat could now be top heavy and roll when turning at speed, the transom might not be able to take it, it could be unstable and I'm sure there are a lot more reasons, also you will void the boats warranty and insurance and any legal responsibility if an accident did happen would be on your head. :eek: Best thing to do if you need more power is to buy a boat that can take it






.

Hey Fergal, thanks for the reply.

Regarding buying a bigger boat - I like the minimal maintenance/less risk that the Whaly offers and at a significantly lower price than a new rib. Granted I could look at the Whaly 500 but they're 7000+ new (no real second hand market) with a 50hp rating - but with costs of outboard, trailer, console etc.. It's just not economic for me.

Regarding a higher hp engine making the boat sit lower, surely this is weight related? As far as I'm aware an older 30hp might actually be heavier than a new 50hp? In addition the indestructible nature of these boats I can't really see any damage to the boat/transom.

Regarding possible rolling/top heaviness outside of just knowing your own limits and assessing weather conditions I think this might be manageable.

My boat won't be insured but I can appreciate the liability aspect. Particularly passenger liability.

Again I'm open to being schooled on all the above!

The current plan/proposal is to pick up the whaly 435r and stick a 50hp outboard on it. These are 40hp rated - I'm know wondering is the power gain worth it?

the beer revolu

It seems like you just want to be told this is OK,rather than actually take advice.

Fergal is probably the most experienced power boater here. I'd listen to what he has to say.

Marcevo190

the beer revolu wrote: »

It seems like you just want to be told this is OK,rather than actually take advice.

Fergal is probably the most experienced power boater here. I'd listen to what he has to say.

Glad to hear Fergal is the man to talk to, I'm relatively new to this forum.

If it's not OK I wouldn't do it but as I said I'm a novice, I've made some assumptions and questioned them - call it a learning process.

fergal.b

Boats in general are dangerous enough and everything we do to them is to insure our safety and the safety of any crew going against that is a big NO NO Will it work, I'm sure it will you could also get away without wearing a life jacket for the whole of your boating life but why take the chance boat companies spend a lot of money working out the safety rating and it's not something you can bend a little. On a whaly 435 the difference in speed between a 40hp and a 50hp will be about 2 MPH is it worth the risk.
As you are new to boating you are doing the right thing asking questions keep them coming, we all love to hear boating stories and never want to be the ones to say I told you so or even worse never get the chance to tell you I would also highly recommend doing a powerboat course https://www.inss.ie/powerboat-courses.479.html you won't regret it.

Best of luck.






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HeidiHeidi

I would also highly recommend doing a powerboat course https://www.inss.ie/powerboat-courses.479.html you won't regret it.

Best of luck.

This, a million times over.

Respect the water, and underestimate it at your peril.

megafan

Marcevo190 wrote: »

Hey Fergal, thanks for the reply.



The current plan/proposal is to pick up the whaly 435r and stick a 50hp outboard on it. These are 40hp rated - I'm know wondering is the power gain worth it?

Also bear in mind weight.... Most outboards now are fourstroke & likley heavier than older twostrokes.... A honda 40hp for instance may be too heavy for your boat!

Ubbquittious

A lot of 40,50,60hp engines weigh the same. There might be a way to block off the last few 100RPM of the engine from being used, just to be on the safe side

Tom44

Ubbquittious wrote: »

A lot of 40,50,60hp engines weigh the same. There might be a way to block off the last few 100RPM of the engine from being used, just to be on the safe side

I have a funyak 390 (3.9m) with a 4stroke Yamaha 25hp. Recommended engine size it 20-30 hp

I would be terrified to up the power as its already like a rocket with 3 on board. The manafactures have done the testing to determine what engine is legally suitable for a reason.
Don't forget they are also an extremely light boat for their size.

As it doesn't like slapping into waves at speed, I recommend you try ones out first.
I am more than happy with my maintenance free boat.

My insurance is €160 for the year, which I wouldn't go out without for common sense reasons.
Boat insurance is your responsibility to others, not yourself.

Click on this.
https://www.google.ie/search?client=tablet-android-om-lge&source=android-home&site=webhp&source=hp&ei=INqOWbPAEYeTgAbHnp7oCg&q=boat+propeller+accident&oq=boat+propeller+ac&gs_l=mobile-gws-hp.1.0.0j0i22i30k1l3.2703.13818.0.14918.19.18.1.11.11.0.828.3533.4j9j1j2j6-1.17.0....0...1.1j4.64.mobile-gws-hp..1.18.2222.3..5j35i39k1j0i131k1.oicJTqSbH_U#imgrc=7wmdbO8kgN8cnM:

Ubbquittious

Tom44 wrote: »

I have a funyak 390 (3.9m) with a 4stroke Yamaha 25hp. Recommended engine size it 20-30 hp

I would be terrified to up the power as its already like a rocket with 3 on board. The manafactures have done the testing to determine what engine is legally suitable for a reason.
Don't forget they are also an extremely light boat for their size.

As it doesn't like slapping into waves at speed, I recommend you try ones out first.
I am more than happy with my maintenance free boat.

My insurance is €160 for the year, which I wouldn't go out without for common sense reasons.
Boat insurance is your responsibility to others, not yourself.

Click on this.
https://www.google.ie/search?client=tablet-android-om-lge&source=android-home&site=webhp&source=hp&ei=INqOWbPAEYeTgAbHnp7oCg&q=boat+propeller+accident&oq=boat+propeller+ac&gs_l=mobile-gws-hp.1.0.0j0i22i30k1l3.2703.13818.0.14918.19.18.1.11.11.0.828.3533.4j9j1j2j6-1.17.0....0...1.1j4.64.mobile-gws-hp..1.18.2222.3..5j35i39k1j0i131k1.oicJTqSbH_U#imgrc=7wmdbO8kgN8cnM:

The Yamaha 25 is a different (and lighter) beast to the 30 and the 40, but in the case where two engines have the same weight, same displacement and everything else but a different power rating is there really any reason to go for the lower rated one?