Planing with an f-rib

[jeffstevens763@g]

Originally Posted by willk

Big mistake IMO - I'd stick with petrol for the OBMs. It's more expensive but much lighter - almost 30% lighter. You forgot to factor in the sump oil on the 4 stroke too. BTW, It's Poly's evening off and I'm minding the slide rule...

yea fair one willk another litre of oil, all adds up but looks like the two smoke is available but either way hes looking at 50 kg lighter than the current rig which will be more manageable on the beach with two people pulling it.

[duggie12]

Mainbrayce just emailed me

£2k inc vat and delivery for the 9.8 tohatsu

Another £2.5k for the folding rib

So 88kg (honwave) and 44kg (current 4 stroke) v 26kg tohatsu and 48kg folding rib

Much lighter and I would love both set ups but I need to decide if I am prepared to spend 4.5k.

Thanks

[Fenlander]

The guy linked by Chipko and used by Mickhitchuk is £500 cheaper for a new Tohatsu 9.8....

https://www.gumtree.com/p/boats-kaya...ine/1166091054

Plus a new Honwave 3.8 air floor (48kg) for £1000...

http://www.elyboatchandlers.com/honw...ie2-inflatable

Now your package is £2k cheaper. Worth a thought??

[duggie12]

Yes, sorry, that would obviously be a better option

[willk]

Be aware that the Tohatsu 9.8hp is unlikely to plane that SIB with 2 fullsize PAX plus kit.

[Fenlander]

I did wonder if it was marginal but Max had great success with the 9.8 on a 3.4m air floor Zodiac with him plus his lad (perhaps more folks too at times).

[duggie12]

Here was me thinking it would do it fairly easily....

That is based on my 15hp planing my honwave with 4 people - not very scientific I know, but it would be a massive weight reduction with a lighter boat/engine and 2 less people

[jeffstevens763@g]

as willk says a 9.9 probably wont do what you require if you scale down what gurnard is saying with his 2.75 & 6hp rig your going to be somewhere similar with the 9.9 and you have paid 4.5k for the pleasure.
current rig 132kg
desired rig 74kg with 9.9
go Suzuki 15hp 4 stroke @ 44kg 92kg total thats 18kg heaver 9kg each two people pulling up beach and will plane engine cost £2025 new.

cheers
just noticed you have a 44kg outboard just the frib then sorted.

[duggie12]

Yeah that's actually probably the best option in terms of weight saved v money spent

Thanks

[Fenlander]

You do well in my experience to plane the 4m with 4 folks and a 15hp... unless of course two are children. I had the 3.5m version and with two adults, two teens and kit it needed perfect conditions to plane with a 15hp 2-stroke.

Edit: As others have just said above I wondered if just saving the weight on the boat would be enough keeping the existing outboard... what make is it?

[duggie12]

Hi fenlander, it's the Suzuki, just a few years old and quite happy with it.

Thanks

[Fenlander]

Ahh OK same as my 20 then at 44kg. If you were able to keep that would the air floor Honwave do saving £1500 over the Frib or are you set on the grp hull?

[duggie12]

I just wished I liked the honwave air floors as it would make the decision simple

My friend bought one (the 3.8) and I took it out but I really didn't like it at all. Floor wobbled about far too much (and we def had it at the right pressure). The other thing that put me off was the trim things at the back which stops fitting normal fold up dolly wheels. My friend wasn't keen on it either and sold it. So that's why I've been looking into the folding rib.

Thanks

[chipko]

I think the F-Rib will fly with the 9.8 and you'll have no trouble planing two up plus some gear.
My 65kg (ally floor, sausage keel) 3.5 Zodiac Zoom bowls along at 21mph (one up) and 19mph (two up) at WOT. Cruises on plane at 13mph on around half throttle.
If we're not towing I'll often use the 9.8 in preference to the Suzi 20 as its a joy to carry, launch and recover. Boat also feels very nimble and in fact not that much slower.

[Max...]

As I said don't rule out the Mariner/Merc 15 2 Smoke - 36kg and 15 hp and much better build quality/finish than the Twatsoo (had of those and two Merc/Mariner 15) tiller gearshift and the best built in tilt/trim mechanism of any little engine. As Fenlander says I had the 9.8 on a 3.4m Zodiac (flat floor like the Honwave/Frib) and top speed was good but more than 1.5 people and it struggled big time. Mine was not exactly reliable either but I was unlucky maybe...

[jeffstevens763@g]

the frib seems to be the boat you really want the GRP hull will work better and reading gurnards reports it has a lot more going for it than an air floor in terms of adding to make it bespoke.as it stands if you buy the boat only and trial with your existing engine you can evaluate performance with the 15 hp you have and transportation off the beach.your only choice is the engine do you go down to a new 9.9 or secondhand two smoke 9.9 or 15.
if it were me for 18kg i would live with it and save 2k your still saving approx 44kg on the current rig buying the frib.

[Fenlander]

>>>wished I liked the honwave air floors as it would make the decision simple

Ahh fair enough... many are very happy with them but a few don't get on with the air floor.

[jeffstevens763@g]

the bloke who designs the boat for all occasions will make a lot of money.

if you can manage pulling your boat up the beach on its own thats were you will be with the frib & the engine you have now approx

[willk]

FYI - my observations about the 9.8hp were made with the large SIB in mind - not the F-RIB (where it might work). It has quite a small displacement for a (almost) 10hp (being a souped up 6hp rather than a detuned 15hp or 18hp). Apparently this leaves it lacking in the torque department resulting in it struggling to get out of the hole with a big load. A torquey 10hp motor might well manage fine?

[Max...]

But don't all the torquey 10's (true 10 or 9.9, not 9,8) weigh the same as the 15 in the range normally? So you may as well....