Getting your SIB planing

simonafloat · 25 April 2016, 18:13

Thought this might make for an interesting thread and it's a question that lots of us need to know when searching for the lightest rig to suit our needs. So what sib have you got, what engine and how many people/ stuff can you get on the plane? Me, bombard aerotec 420, 15hp mariner 2 stroke, 3 adults and a child on the plane without too much fuss. 4 adults managed to bounce it onto the plane with a struggle.

psycho · 25 April 2016, 18:34

I have a Quicksilver 380HD, ali floor, with a Mariner 10hp, it will plane easily with 2 adults and basic gear, but have not had time to experiment with more yet.

Quicksilver mike · 25 April 2016, 20:07

I have a Quicksilver 380 hd with mercury 15hp 2 stroke, it planes with 3 adults well but 4 is a struggle. I am considering a 25hp 2 stroke Yamaha, how do you think that would perform?

thestig1973 · 25 April 2016, 20:20

Quote:

Originally Posted by Quicksilver mike

I have a Quicksilver 380 hd with mercury 15hp 2 stroke, it planes with 3 adults well but 4 is a struggle. I am considering a 25hp 2 stroke Yamaha, how do you think that would perform?

I've got the same outboard as you Mike

previously had a Yamaha 25hp, the yam had lots of low/mid/top end grunt on a sib and was an excellent engine, BUT.... It weighed around 52kg as opposed to 34kg on the Mercury

18kg extra is a huge difference off the water

warder54 · 26 April 2016, 12:18

Honwave 380 air floor, Parsun 9.8 4 stroke.
Easy plane 1 up with gear, a little longer with 2 adults but gets up ok. Would love a 15/20 hp but the Parsun works well for my needs.

lightning · 29 April 2016, 21:03

I have a Zodiac Cadet 285s (2.8m) with a Tohatsu 9.8.
With this engine the Zodiac goes like a rocket, planing pretty much instantly with two of us on board and achieving close to 20mph.

Prior to the Tohatsu l had a Mariner 6hp and the boat would plane two up with a few seconds taken to get going. It would get up to about 14mph.

The Zodiac 285s is a great little boat, it has a solid floor and air keel so planes and handles really well.

thestig1973 · 29 April 2016, 21:18

Sounds fun

If your from marple, stockpot then we should get a little sib outing organised ..... There's not many sibbers around here

jeffstevens763@g · 30 April 2016, 07:21

Quote:

Originally Posted by Quicksilver mike

I have a Quicksilver 380 hd with mercury 15hp 2 stroke, it planes with 3 adults well but 4 is a struggle. I am considering a 25hp 2 stroke Yamaha, how do you think that would perform?

I have a 365 hd Mercury same boat shorter cones with 25 hp Suzuki 4st at around 5200 rpm 20-22 knots flat water.

MatFromPoland · 30 April 2016, 08:52

HONWAVE T38IE2 Air Floor
HONDA BF20

350 kg of people and gears

me+wife+3 kids about 300 kg and 25 l of main tank, 12l of spare tank, some gears like neoprene suits, fins, food for 5 people ...

Speed in plane 10 - 16 knots

Maximus · 30 April 2016, 17:12

Regardless of type and Power you can easily Kill even a Decent SIB's potential performance by Bad Loading and or overloading of gear.....not to mention Passengers.
IMO It always pays to consider the type of jaunt you're on,the expected weather AND type of Crew...the smaller the Boat the more you need to plan.
Especially important if it cuts up rough!
I used to carry a lot less gear in good weather with the Wife and a couple of Kids on Board my Zodiac..
If alone on extended trips you can often afford to take more "Stuff"...

Stigomery · 04 May 2016, 07:30

I've not really had time or people to experiment yet, but max load so far has been 2 adults at roughly 75kg each, 3 kids at roughly 25-30kg each, 10 litres fuel, large picnic, etc. Briefly peaked at 18 knots but we didn't actually cruise at WOT so no idea what actual top speed would have been with that load.

The Honwave T38 + 20HP Honda planed with ease, to be honest I didn't really notice much difference over being out with half that load, so I would expect it to plane with 4-5 adults... But I have not tried so I could be wrong.

nicksharpe · 04 February 2017, 11:02

Just bought my first set up: Excel 365 and a Mercury 20 4 stroke.

Few questions:
I'm wondering if the engine is too big (50kg). Very heavy to lift on and off and I get the feeling from posts on here that a 10 would do the job.
I'm trailing the whole thing but a bit worried the weight of the engine bobbing about in the back might damage the transom.

Just wondering what you guys thought?

Nick

nicksharpe · 04 February 2017, 11:05

Just bought my first set up: Excel 365 and a Mercury 20 4 stroke.

Few questions:
I'm wondering if the engine is too big (50kg). Very heavy to lift on and off and I get the feeling from posts on here that a 10 would do the job.
I'm trailing the whole thing but a bit worried the weight of the engine bobbing about in the back might damage the transom.

Just wondering what you guys thought?

Nick

Fenlander · 04 February 2017, 16:08

A 20hp on a 365 or thereabouts of most makes is a suitable combination (I'm assuming your 365 is rated to a 20?) and on the water the engine will be supported on the transom fine. Different folks have different ideas about trailing SIBs with 50kg engines though. I'm not keen unless the transom and outboard skeg are both well supported.

A 10hp doing the job? What use I wonder? With a 10 it may be just acceptable with 1/2 folks but 15min or 20 is far far better to give you leeway for greater loads and difficult sea conditions. There is nothing worse than a SIB that will not... or only just... plane.

nicksharpe · 04 February 2017, 16:22

Thanks Fenlander.

The boat's rated to 20 so that's all fine.

As to support... Transom savers seem to be all the rage in the USA but non existent over here (which given our roads compared to theirs is a bit crazy!).

Worth shelling out the thick end of £100 on one?

N

Fenlander · 04 February 2017, 16:40

Have a look on search for threads like this...

http://www.rib.net/forum/f50/trailer...ine-74485.html

I have only trailed grp smallcraft with 20hp+ and always made sure the trailer would allow the outboard to be down in the running position as far as possible with a strap to prevent bouncing.

chipko · 04 February 2017, 18:03

Good advice from Fenlander as always.
Difficult question to answer as all depends what you want from your sib. In terms of boat size your 20hp Merc. is perfect, as max hp and within transom weight for boat. Will plane easily 3 up and pull teenager on toys/kneeboard 1 or 2 up. If none of that interests you then a 10hp with 1 or 2 up will also be fine and get you on the plane. Me, I would always put the max. hp the boat is rated for, as long as I could manhandle the motor on/off the transom.
As for trailering that's a different story. All depends on distance. Need to ensure transom is well supported on trailer and motor wedged/supported/strapped to trailer if travelling any distance.
Aside from trailering issues, and your ok with manhandling a 50kg outboard, I would say you have the perfect motor for your 3.65m sib. Enjoy.

PS Please don't take this the wrong way but, if you are trailering, why have a sib?

jeffstevens763@g · 04 February 2017, 18:09

Ive just trail my sib with wide bunks and a keel bunk or pad I set my engine at shallow draft with a block of HDPE plastic between the leg and bracket to take the load instead of the mechanism I would have it fully lowered down if there were enough clearance I've towed like this for years and for miles never had any problem but the engine always has a ratchet strap around it to prevent any movement.

69cmw · 04 February 2017, 18:31

Quote:

Originally Posted by jeffstevens763@g

Ive just trail my sib with wide bunks and a keel bunk or pad I set my engine at shallow draft with a block of HDPE plastic between the leg and bracket to take the load instead of the mechanism I would have it fully lowered down if there were enough clearance I've towed like this for years and for miles never had any problem but the engine always has a ratchet strap around it to prevent any movement.

This is how I towed a Bombard Aerotec and a Zodiac Classic, both with 25HP Yam 2 strokes on and never had any issues at all.

tamsbairn · 05 February 2017, 01:20

Hi
I have a DSB Zephyr 4mtr with a yamaha 40hp twin two stroke, it goes out with two my partner Dawn my self and anyone else that fancys (up to two ) a spot of fish or just for the jolly planning and speed is there but just potting along and having a nice day is good