Need for an auxiliary engine on a SIB???

[The Bass Stalker]

This should be a picture of the nearly final bracket. I couldnt really have bought one because I wouldnt have been able to control the projection, height etc so the transom wheel could swing past etc, plus they are really expensive for some reason.

It weighs in at 1.5kg which probably isnt too bad. If it were having an engine on permanently then it might need a bit of ply clad on the corners but I could stand on it and it wouldn't break so sure its fine.

[Locozodiac]

Are you guys experiencing conduction problems, that's sib going to a side as the propulsion is not done at middle transom ? Can you fully throttle without any issues when encountering a hard wind emergency ?

Happy Boating

[kaman]

Originally Posted by The Bass Stalker

This should be a picture of the nearly final bracket. I couldnt really have bought one because I wouldnt have been able to control the projection, height etc so the transom wheel could swing past etc, plus they are really expensive for some reason.

It weighs in at 1.5kg which probably isnt too bad. If it were having an engine on permanently then it might need a bit of ply clad on the corners but I could stand on it and it wouldn't break so sure its fine.

That's a tidy piece of wood work you have there!
Looks good!
Hope it does the trick.
Can't see why it shouldn't.

[kaman]

Originally Posted by Locozodiac

Are you guys experiencing conduction problems, that's sib going to a side as the propulsion is not done at middle transom ? Can you fully throttle without any issues when encountering a hard wind emergency ?

Happy Boating

Errrrmmm?
Can't make out your post?
Dont know if your phone/ tablet has went haywire with the predictive messaging?

Don't imagine the sib will go straight with the engine out on a limb but it doesn't tend to go straight even with the 20 hp slap bang in the centre of the transom unless im giving it some wellie.
I have to constantly work the tiller at trolling speeds to go in a straight line.
I've worked an Alaska 500 with a 15hp Yamaha mounted as an aux on the starboard side.
The 50 hp Evinrude chucked it and the old Yammie got deployed.
The 500 didn't want to go straight eithers but I worked the tiller and got us back to shore nevertheless.
Im hoping mines will be able to do the same should the need ever arise.

[The Bass Stalker]

You are so patient not to get out there and try it. Maybe the water isn't 100 yards away like it is for me. I think it will track fine because you'll only be going about 3knts so the v will help it track. If at planning speeds that would be a different matter. Try the main engine out there for a laugh and post a you tube clip. I predict just as it starts planning you will do a wicked dognut. Cool

[kaman]

Originally Posted by The Bass Stalker

You are so patient not to get out there and try it. Maybe the water isn't 100 yards away like it is for me. I think it will track fine because you'll only be going about 3knts so the v will help it track. If at planning speeds that would be a different matter. Try the main engine out there for a laugh and post a you tube clip. I predict just as it starts planning you will do a wicked dognut. Cool

I'm 20 mile to the sea.
I'm patiently waiting till the end of the month to get away for four nights with the sib and caravan and my old man.
Some fishing and a few beers - bliss!
I think I'd break the transom with 51 kg of Twatsu hanging on it.
With my 18stone the Sib would roll over upside down!
It would make for a hilarious YouTube video going at full tilt tho!
Straight into the boating fail compilation ahahahah!

[Locozodiac]

Kaman,

Check if that wooden mount flexes sideways when giving full power with aux sitting on it.

If central engine dosen't want to go on a straight course, you must play rotating trim tab under anticav plate untill boat goes straight. Probably will need a little help by tighten a bit the steering friction nut as to achieve a more steady steering.

Happy Boating

[kaman]

Originally Posted by Locozodiac

Kaman,

Check if that wooden mount flexes sideways when giving full power with aux sitting on it.

If central engine dosen't want to go on a straight course, you must play rotating trim tab under anticav plate untill boat goes straight. Probably will need a little help by tighten a bit the steering friction nut as to achieve a more steady steering.

Happy Boating

Hi Locozodiac.
I meant that the sib wouldn't go straight at slow speeds due to the tide and chop knocking it off course.
I do a lot of trolling and my tiller arm works like a fiddlers elbow to keep it relatively lol!
My mount is 50 mm 3mm thick box section mounted to 4mm sheet steel.
I have used 4xm12 stainless bolts through the transom to secure.
Large square stainless washers on outside and inside as well.
Sealed it with sikaflex.
The plate that is mounted on the inside of the transom is almost half the size of the transom to help spread the load.
I have mounted the engine and gave it a bit of o lean on to check for play.
Not a bit!
It I'd very robust and I don't envisage any issues with it handling the lightweight aux.
Time will tell when I get it on the sea.
You can see the bolts in the pictures.
Fingers crossed.

[kaman]

Moment of truth draws near.
I am away Tuesday till Friday to my caravan with the trusty Sib.
I have done a lot of upgrades over the winter.
The main one is the aux mount.
I will finally get to sea trial it.
Fingers crossed!
I will update the thread upon my return.
Happy boating!

[bartiny]

Looks a nice job Good luck with the testing

[kaman]

Finally tried out the aux outrigger today. Had the engine mounted on the inside of the tube for the duration. Transferred it to the outside of the tube when I was returning to port.
I kept the external mounting plate bolted in place throughout to get a feel for how it interacted with the waves and chop.
It was exceptionally choppy at one point.
When setting off at speed before the Sib got planeing the bow rose causing a few splashes to wet the bottom of the outrigger plate.
Nothing to be concerned about tho as I don't intend having the plate mounted until it is needed.
I'm going to trim 50 mm off the bottom of the aux mount and weld another bit of 50 mm box section on top to raise the engine up a little bit and give more water clearance.
Might raise it a bit more than 50 mm as the propeller and cavitation plate were sufficiently deep enough in the drink to worry about it aeration.
My old man and I sat in the centre of the Sib to stop it leaning to one side. The Sib steered well with the aux and we trolled our lures slowly for around a mile back to port.
All in all very pleased with the creation which will give me a bit more peace of mind when going to sea.
Happy Sibbing

[kaman]

Been out 3 times fishing in the last week and have taken the aux with me each time.
Used it twice now on the outrigger really pleased with its performance. I think it will be s permanent fixture on the Sib. Here's a few pics.

[kaman]

Took a video of the aux powering the Sib yesterday.
Goes well.
Tiller turned around 30 degrees to the right to account for the engine being mounted to the right.
Don't know if this will work??

https://www.youtube.com/watch?v=pXpH...e_gdata_player

[kaman]

Didn't work.
Try this instead.

[The Bass Stalker]

Can't get link to work. Says private link? Would be interested to see. If it doesn't work brilliantly, then I'm sure you could sqeeze a bracket in where I have mine. Doing the same as before, storing in current position and then onto bracket

[The Bass Stalker]

Still not worky. Also making the bracket out of metal will be so much easier to make strong rather than wood. Should get to try mine tmrw.

[kaman]

Originally Posted by The Bass Stalker

Still not worky. Also making the bracket out of metal will be so much easier to make strong rather than wood. Should get to try mine tmrw.

Hi Bassstalker, this set up working fine.
No room to accomodate aux on transom within the tubes im afraid.
Hopefully I don't need to depend on the aux too often to get me ashore.
I gives a bit of peace of mind having one though!

https://www.youtube.com/watch?v=pXpH...e_gdata_player

Changed youtube settings this should work now....... I hope.

[The Bass Stalker]

Looks great. Bit weird having at an angle but at least the tiller is inboard, lol. Seems to work great. Last test is in the rough sea to see if it stays submerged and to see if it holds its line when the boat goes up and down so the forces of the 30 deg power may change boat direction radically as it goes over a wave. But its only a recue device so should always get you away from the rocks.

Can't wait to try mine.

[kaman]

Originally Posted by The Bass Stalker

Looks great. Bit weird having at an angle but at least the tiller is inboard, lol. Seems to work great. Last test is in the rough sea to see if it stays submerged and to see if it holds its line when the boat goes up and down so the forces of the 30 deg power may change boat direction radically as it goes over a wave. But its only a recue device so should always get you away from the rocks.

Can't wait to try mine.

Hope your sea trialling goes well.
I have trialled it in the rough rolling chop a few days ago.
Didn't feel confident having one hand on a camera phone to film it though.
Nowhere near being swamped with water.
The engine is mounted higher than top of the tube so if engine gets dipped the tube will need to be submerged - so a wet engine will be the least of my worries.
It did require a bit more work with the tiller and throttle to get to where I wanted to get to.
It ain't pretty but it's better than a set of oars lol!

[The Bass Stalker]

For sure better than oars, and it looks like it will work which is great.

I actually meant the opposite. I wondered if the air intake would stay submerged so that it constantly pumped water to keep cool. Its already higher than the transom by quite a bit as far as I can tell? I know the engine case will never get near the water, just spray which is fine.