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Size of auxiliary Printed From: The Fishing Website Category: General Forums Forum Name: The Boat Shed Forum Description: Discuss all things boating. URL: https://www.fishing.net.nz/forum/forum_posts.asp?TID=138549 Printed Date: 05 Jun 2026 at 11:21am Topic: Size of auxiliary Posted By: Daniel1520 Subject: Size of auxiliary Date Posted: 25 Apr 2024 at 8:18am Greeting from South Africa! Need some advice. Just bought a 4.5m RIB with a 40hp on it. Is a 15hp auxiliary enough to get me home from 15NM out if the main engine fails? Won't be going out if wind is over 15NM Replies: Posted By: e.m.p! Date Posted: 25 Apr 2024 at 10:48am 15 is plenty, (if not maybe even a tad overweight?) I used a 15hp on a 3.6m plastic pontoon as its main motor. I wanted to test its limits with two people on board at went out rock hopping in 22knt wind. Overall weight was probably in the 350-400kg range with all the water and two soaked spearo's on board. Got what I was asking for and puttered home burning 1l per km. Got home nonetheless, but upgraded since to 30hp. So yes - you will get a RiB home with 15hp and then some. Question is if you want to carry it with you in the first place… 35kg extra is quite a number

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