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Old 18 June 2015, 21:19   #1
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beaching considerations

Hi there,
I'll try to keep this simple and to the point.
I am looking for thoughts about a boat that we are looking at purchasing for a business venture...without getting too much into the details of the day-to-day; we need a medium sized boat to get men and gear onto rocky shores and rocky beaches.
We have always used SIBS in the past due to the rocky shoreline in the Howe Sound, as I have felt they did this best. We currently have a 14ft SIB with a tiller and in the past we had a 16ft SIB with a nice console system(recently stolen). The beaching advantages of these are clear, however, they suffer in the performance category when comparing to a RIB.
We are now looking at upgrading to a 17-18ft sized boat that would need to move more people and faster and further.
So my question(s) revolves around this...Is there any way to make a RIB able to beach on rocks regularly without causing hull damage? Something more than a simple keel protecting strip? Or should I stick with the SIB format? Will this format (just like the set-up we had before) perform better or worse in the larger size with say a 50hp on it? Is there any way to stiffen stringers and/or transom in a larger SIB?
There's a lot there to consider...thanks for taking the time for reading and thanks in advance for any suggestions or thoughts.
cheers,
Simon
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Old 19 June 2015, 00:42   #2
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I have a Buster magnum aluminium with a Honda 130 outboard coming up for sale in the next cuple weeks . This would be ideal for the Job with loads of deck space for transporting crew .
Boat and trailer in V good condition 13000
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Old 19 June 2015, 02:38   #3
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Rigid Rader or dory hull seems perfect for this role.
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Old 19 June 2015, 03:15   #4
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We did see boat here recently which had the hull covered in a giant keel protector. It's a lot of trouble and will still get damaged if it's not treated delicately. You may be as well buying an aluminium hull (also not invincible).

Or have you considered retooled polythene something like a pioneer multi with its fold down front might be ideal. There are more affordable alternatives but none I am aware of with that ramp. If you search youtube for waly boats you will see the sort of abuse they can survive. There are also examples of mac boats being intentionally driven into rocks somewhere. At the end of the day though you will always have a vulnerable prop sticking out the back.
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Old 19 June 2015, 03:22   #5
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At the end of the day though you will always have a vulnerable prop sticking out the back.
Outboard jet will help with that too - still got the leg but it'll let you get closer.

Mount this on a rigid raider (or similar) and you'll get everywhere you want to go.

It's why the marines use them
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Old 19 June 2015, 04:37   #6
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The problem as I see it is that you require a boat with a very shallow draft i.e sib to get close to the shore, but you also need a boat with a med- deep Vee hull to cut through the chop. I think that a single boat cannot do both. The advice on the Ali Hull may be the best solution as it has a Vee hull and can take some abuse.

TSM
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Old 19 June 2015, 04:41   #7
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Beaching

Thanks for your input guys.

A lot of the suggestions here are unavailable to me here in PNW Canada.

I guess my question open to this forum is sort of a philosophical/engineering one that has probably been covered...but in this case it is very mission specific.

I need to move 6 people several times daily 10-25km at good speed to places that have no soft landing...hard rock ledge shelfs.

I am considering a Defender 530 or Achilles SU18 with a full console system and 50hp or on the other hand a very durable RIB like an SRMN500/550 with a 70hp

I know the obvious points about how they would compare as far as performance on the open water...but what I would love is any info about beaching abilities and durability of a RIB...and any other mods that could help this.

At the end of all of these trips there will be no way to get the personnel off the boat without putting the bow on rock shelfs. I have zero experience with aluminum hulled boats so don't know if thats a reasonable solution...my gut tells me with seeing how the sea beats up boats on the shore it would not cut it...but I'm looking for people with experience.

thanks again,
SH
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Old 19 June 2015, 06:08   #8
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Sea legs is the way to go.
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Old 19 June 2015, 06:09   #9
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Originally Posted by otilly View Post
Sea legs is the way to go.

Even then you'd need a gentle shelving beach, not a rocky shelf. The potential for costly damage is even higher.


.....sh1t happens.......
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Old 19 June 2015, 06:29   #10
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Quote:
Originally Posted by otilly View Post
Sea legs is the way to go.
Lot easier (and cheaper!!)...pluss that choice although no doubt right for some is rather "limiting" your type/spec of RIB.... surley better just to get a small Dinghy tender!...or anchor and swim (Dry suit optional)..works for most peolple.
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