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Old 10 March 2013, 14:43   #1
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Took me Sib for a Spin :)

Saturday was my first opportunity to use my newish sib. I took it out once before in September, but i did not have a proper go on it. I have to say I am very, very impressed!

She is a 4m ali deck honwave with a 2006 25hp 2 stroke engine. When they had been bought in september, they had done 30hrs. The set up came with everything as well as a road trailer. All is immaculate condition with a full service history. How much would you have expected to pay for this? (just curious because i think i got an awesome deal). It was a step up from my 2.6 meter sib with a 4hp 4 stroke.

Anyway, I took her out on the gower, Oxwich bay. There as a decent sell and some chop, but nothing that would put me off. The weather as excellent for the time. Mostly sunny and medium winds. I as SUPPOSED to be fishing with my friend with a 3.2 meter airdeck honave with a 5hp honda, but i ended up doing endless circuits of the bay at WOT!

I have a couple of questions though. Firstly, when i do turns at high speed i get a little cavitation (the boat is fine and it does not bother me much as it is only a little bit) I just wanted to know if I could solve it because it would be better without it, or do I just have to put up with it? Also, I found recovering the boat on the slip way a bit of a nightmare. The deck got completely flooded making it difficult to lift onto the trailer. I know SIBs are supposed to be used with skids, but would rollers be OK? My friend has rollers and he assures me it is a lot easier even with a SIB.

But looking back it was a great day out! Caught a few pouting even with a easterly wind! Bring on the summer with my new knee board! Also, just being cheeky here, but how fast would you expect this boat to go? (I know this is the ultimate newb question, but atm i have no way of recording speed.)

Thanks for reading,

Henry
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Old 10 March 2013, 14:53   #2
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Quote:
I have a couple of questions though. Firstly, when i do turns at high speed i get a little cavitation (the boat is fine and it does not bother me much as it is only a little bit) I just wanted to know if I could solve it because it would be better without it, or do I just have to put up with it? Also, I found recovering the boat on the slip way a bit of a nightmare. The deck got completely flooded making it difficult to lift onto the trailer. I know SIBs are supposed to be used with skids, but would rollers be OK? My friend has rollers and he assures me it is a lot easier even with a SIB.
Cavitation could be caused by engine too high or trimmed up too much, basically prop coming out of the water so lower that spinning egg whisk.

y u lifting on to trailer/ submurge the trailer so it floats on or get launchin wheels. wheel barrow sized wheels as they go over pebbles etc.

if its full of water upon recovery. take it for another run with drain plugs out and lose the water first before recovery
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Old 10 March 2013, 14:56   #3
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Cavitation could be caused by engine too high or trimmed up too much, basically prop coming out of the water so lower that spinning egg whisk.

y u lifting on to trailer/ submurge the trailer so it floats on or get launchin wheels. wheel barrow sized wheels as they go over pebbles etc.

if its full of water upon recovery. take it for another run with drain plugs out and lose the water first before recovery
I know about pulling the drain plugs, but the rubber seal fell out of the drain plug, so as soon as you stop water pours in.
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Old 10 March 2013, 14:57   #4
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well get that sorted and thats one problem solved

ref the cavitation, is the high pressure air floor up to its required high pressure?
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Old 10 March 2013, 15:04   #5
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well get that sorted and thats one problem solved

ref the cavitation, is the high pressure air floor up to its required high pressure?
it is an ali floor, with a inflatable tube keel. It says to inflate it to 0.35 BAR, i did with a BRAVO pump, so yes, I know it is the right pressure.

What launching wheels to you recommend. The ones I boat for my last SIB were rubbish and cost me 60 big ones. I would need a good, high, sturdy pair.

CHeers for help
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Old 10 March 2013, 15:05   #6
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Just look on flea bay, i think they are about 180 but work well, made by Trem i think, shaped like a banana as you have a inflatable plning pad so have to clear that unless its a older honwave with a straight down transom. these are the ones with plastic wheelbarrow tyres, ideal for shingle slips and sand
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Old 10 March 2013, 15:36   #7
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Quote:
Originally Posted by henryfreston View Post
... a 2006 25hp 2 stroke engine...but i ended up doing endless circuits of the bay at WOT!...... when i do turns at high speed i get a little cavitation (the boat is fine and it does not bother me much as it is only a little bit) I just wanted to know if I could solve it because it would be better without it, or do I just have to put up with it?

Quote:
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Cavitation could be caused by engine too high or trimmed up too much, basically prop coming out of the water so lower that spinning egg whisk.
I am guessing that this engine has no power trim? In which case the trim angle is a compromise for best overall behaviour. You can lower the trim, but it may be slower, wetter, less comfortable the rest of the time as a result. If you had a bigger boat/engine with power trim you would trim down for tight turns. You may adjust the trim for each trip to suit the conditions / load etc - but probaby you'll find one setting which suits 80% of occasions, [Technically this will be ventilation rather than cavitation].




Quote:
Also, just being cheeky here, but how fast would you expect this boat to go? (I know this is the ultimate newb question, but atm i have no way of recording speed.)
20 knots-ish. Might get 24 lightly loaded on a flat calm day.

Quote:
y u lifting on to trailer/ submurge the trailer so it floats on or get launchin wheels. wheel barrow sized wheels as they go over pebbles etc.
Matt is right - the technique is slightly different for a bunked trailer from rollers - generally that means putting the trailer in deeper rather than driving it on. your friend is probably right that life is a little easier with rollers - BUT I wouldn't keep a sib on a typical small roller coaster long term as the load is not as evenly distributed.
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Old 10 March 2013, 15:42   #8
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Quote:
Originally Posted by henryfreston View Post
Saturday was my first opportunity to use my newish sib. I took it out once before in September, but i did not have a proper go on it. I have to say I am very, very impressed!

She is a 4m ali deck honwave with a 2006 25hp 2 stroke engine. When they had been bought in september, they had done 30hrs. The set up came with everything as well as a road trailer. All is immaculate condition with a full service history. How much would you have expected to pay for this? (just curious because i think i got an awesome deal). It was a step up from my 2.6 meter sib with a 4hp 4 stroke.

Anyway, I took her out on the gower, Oxwich bay. There as a decent sell and some chop, but nothing that would put me off. The weather as excellent for the time. Mostly sunny and medium winds. I as SUPPOSED to be fishing with my friend with a 3.2 meter airdeck honave with a 5hp honda, but i ended up doing endless circuits of the bay at WOT!

I have a couple of questions though. Firstly, when i do turns at high speed i get a little cavitation (the boat is fine and it does not bother me much as it is only a little bit) I just wanted to know if I could solve it because it would be better without it, or do I just have to put up with it? Also, I found recovering the boat on the slip way a bit of a nightmare. The deck got completely flooded making it difficult to lift onto the trailer. I know SIBs are supposed to be used with skids, but would rollers be OK? My friend has rollers and he assures me it is a lot easier even with a SIB.

But looking back it was a great day out! Caught a few pouting even with a easterly wind! Bring on the summer with my new knee board! Also, just being cheeky here, but how fast would you expect this boat to go? (I know this is the ultimate newb question, but atm i have no way of recording speed.)

Thanks for reading,

Henry
Top speed?
25hp 2 stroke yamaha on my futura recorded 31mph on GPS last Monday, although it was an I phone app I used to measure speed so possibly not 100% accurate

Similar size sib/horsepower so I suspect similar top end
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Old 10 March 2013, 17:08   #9
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new sib

Used to have a t 40 , with ali floor, mine used to behave same as yours on tight turns a lot depended on sea conditions and load but never realy cured the prop slip, re recovering with a bunked trailer,used to put trailer right in and float boat over bunks, easy, to help i fitted a winch on trailer , connected to tow bar and unhooked trailer and used to launch/recover trailer back to car further up slip, got it off to a fine art.
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Old 10 March 2013, 17:10   #10
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Used to have a t 40 , with ali floor, mine used to behave same as yours on tight turns a lot depended on sea conditions and load but never realy cured the prop slip, re recovering with a bunked trailer,used to put trailer right in and float boat over bunks, easy, to help i fitted a winch on trailer , connected to tow bar and unhooked trailer and used to launch/recover trailer back to car further up slip, got it off to a fine art.
Good idea with unhitching the trailer. One day i may leave the sib and go for a 3.5m rib instead, what are your thoughts?
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