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Old 26 October 2012, 16:24   #1
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Auxilliary Engine on RIB

What do Forumers think about adding say a 5HP auxilliary outboard to a Zodiac Pro Open 550 with a 115HP .

Also would members normally use the main engine for steering and lock the auxilliary in the centre position.

How easy would it be to fit this type of set up.

Thanks for input
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Old 26 October 2012, 17:01   #2
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Quote:
Originally Posted by nigel52 View Post
What do Forumers think about adding say a 5HP auxilliary outboard to a Zodiac Pro Open 550 with a 115HP .

Also would members normally use the main engine for steering and lock the auxilliary in the centre position.

How easy would it be to fit this type of set up.

Thanks for input
a Reckon it may struggle a bit but a 2 stroke will be better than a four, size and weight wise ( also cost wise ).
b Yes, but there are exceptions, your 115 will drag the 5HP like crazy.....don't really reckon you should use this set-up in an emergency. I have a 4HP wing for my 30HP on my 4m SR.
c Should be easy enough with the wee 5HP, maybe not so with an engine that would be more suitable.

Doesn't really help you much does it?
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Old 27 October 2012, 02:28   #3
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Where abouts do you do your boating...?
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Old 27 October 2012, 08:41   #4
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Originally Posted by mister p View Post
a Reckon it may struggle a bit but a 2 stroke will be better than a four, size and weight wise ( also cost wise ).
b Yes, but there are exceptions, your 115 will drag the 5HP like crazy.....don't really reckon you should use this set-up in an emergency. I have a 4HP wing for my 30HP on my 4m SR.
c Should be easy enough with the wee 5HP, maybe not so with an engine that would be more suitable.

Doesn't really help you much does it?
Sorry Mr P but I did not really understand your various answers.
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Old 27 October 2012, 08:45   #5
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Where abouts do you do your boating...?
Hi Chris, we will be using the RIB for Pleasure trips around the various islands off La Rochelle, West coast France. Also wake boarding and waterskiing. Some of the distances between the islands are about 15-20 miles hence the question about auxilliary/back up if the main engine fails. Sods law says it will when you are out at sea and we do not have a local RNLI or Seastart on easy call.

(BTW I would not call them as I like to be self sufficient but they are a luxury back-up in a real emergency)
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Old 27 October 2012, 10:12   #6
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How about a Tohatsu 2 strokes 9.8 HP, 170 CC aux, best in it's class, light and with punch. Weights 26 Kg as their 6-8 HP younger brothers which are detuned same weight/sizeversions.

Happy Bopating
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Old 27 October 2012, 10:52   #7
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How about a Tohatsu 2 strokes 9.8 HP, 170 CC aux, best in it's class, light and with punch. Weights 26 Kg as their 6-8 HP younger brothers which are detuned same weight/sizeversions.

Happy Bopating
Thanks - as I already have a 5HP Tohatsu I thought I might as well use this.
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Old 27 October 2012, 12:50   #8
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If you're carrying more than 3 people you'll probably find 5hp isn't quite enough.
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Old 27 October 2012, 13:14   #9
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Thanks something to think about
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Old 27 October 2012, 13:57   #10
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As a general rule of thumb, we always used to reckon 1hp for each metre - so 5hp for a 5.5m RIB doesn't sound too silly (after all, an aux is a get you home motor, or use it for trolling etc).

I don't think that you'll get that much steering effect using a fixed aux and the main as a rudder - esp at low speed, where you are directing the thrust when you steer. Probably better to lift the main out of the water, and use the aux for power and steering, if you can.

Is there any way that you can rig it temporarily to see whether it's up to it?

IMHO, obviously...!!
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