Originally Posted by martin33100
what is the smallest reserve outboard (ie HP) that will get a 5m-5.5m rib out of trouble?
I suppose it rather depends on how much trouble you are in.
However I must admit I have bee thinking about auxiliaries especially after a number of very interesting recent threads, “2 engines or 1”, and Alystar’s “The day the engine stopped” for example.
• I would be very interested to know
• What hp people have?
• What prop size and pitch?
• How they are set up?
• Who test theirs out and in what conditions?
• and how they got on?
I have a Yam 2stroke 6hp which just squeezes onto the transom without interfering with the main Opti.
A few weeks back I tested it in fairly sheltered waters about ½ ml offshore with about a 10kn breeze and a slight chop of less than a 0.5m. I strapped the aux into ahead and in general I was able to steer using the main engine leg surprisingly well. The best I was able to get out of her was 5kn which didn’t seem that bad however even in the slight chop the pitching was enough to cause the prop to get close enough to the surface to start aireating. This would cause her to drop of to say about 3.5kn before picking up again.
The next day we came across the same bay and round a headland we found ourselves pushing a 20kn breeze and a very short chop of about 1m. I didn’t try the aux as we had been out snorkelling for a couple of hours and we all wanted to get beck ashore. However I am pretty sure we would have made dismal if any progress and how we would have been able to steer I am not sure. I think the bow would have been knocked off and with little headway steering with the Opti’s leg would have been ineffectual.
I admit that I really must make the time to test this out in more demanding conditions and should have done so when I was out a few weeks back.
We currently cruise where the Pyrenees reach the Med the weather can be lovely but often very very localised. Finding a 20kn + breeze when you come round a headland is quite normal and from time to time I’ve been out and run into a fair bit more. Out of season I can have the whole place to myself seeing at best a distant trawler all day. So if I get things wrong and there is no easterly in the wind it is next stop Algeria or Libya but if I am lucky perhaps the Balearics.
I suspect my 6hp Yam the way it is set up is not up to the job but what do I do? Anything any bigger will take up too much room on the transom and interfere with the Opti. My understanding of the Yam 6 is that it is essentially the same as the 8 but just down tuned. So by going up I probably won’t gain much if anything and anyway you can’t get these 2 strokes new anymore. The 4 stroke yam is too wide to fit.
I think getting the prop lower would help and I could do this by cutting out the transom but I must admit I don’t fancy that as it may weaken the transom in general. I could be just inviting a whole load of problems. Also lowering the aux may put it in danger of swamping
An outboard bracket might be the way to go so I could get the aux lower in the water but I doubt if I could get an of the shelf one that would do the job.
I was also thinking about a different prop but am not sure which to go for.
Then of course I could go for replacing the opti with twins but I am not in the mood for that as I might just as well start from scratch with a new boat. To be honest I would feel more comfortable with twins but on a 6m? I would be better of going for a 7m + but that isn’t going to happen right now.
So what do others do or am I just asking too much from what is just a small auxiliary?
Your ideas please.