This game-changing hull will not slam | Rafnar 850 RIB test drive review | Motor Boat & Yachting
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- Опубліковано 2 лис 2020
- Is it possible to build a fast boat that never slams? Hugo tests the first British-built Rafnar 850 RIB to find out...
Rafnar 850 specification
LOA: 27ft 11in (8.50m)
Beam: 10ft 0in (3.05m)
Displacement: 3,600kg
Fuel capacity: 300 litres
Water capacity: 40 litres
RCD catergory: B
Price: £353,000 (inc. 440hp Volvo Penta D6 engine)
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Take it to haulover inlet in fla!
I would love to see that!
AGREED
Not a good day to show off the supposed abilities of this new design. Head out when there's a "small craft advisory".
Test drive in a 1 foot chop is no match for Haulover, Hillsborough, Boca, Jupiter, Etc....on a shitty East wind day with tide going out!!!
Lol I was thinking the same thing
Rafnar UK Limited
Hi Guys,
Tom here from Rafnar U.K.
We had a great few hours afloat with Hugo and love this review that he has produced.
Thank you Motor Boat & Yachting.
For the record, we can’t control the weather and it was a pleasant day out just East of the Solent on the uK south coast.
The worst sea was actually during the speed runs and even then it was only just scraping in to a Seastate 3 at best.
For those wanting rough weather, we have a lot of videos you can find on UA-cam if you search either Rafnar U.K. or Rafnar Maritime and as we film more we will publish more.
As for Haulover, we love that kind of stuff and when we can we have already agreed with a few of you that we shall bring a boat over and maybe run some public trials.
But, for the record, it’s not just shiny mega yachts that use our boats, our primary customer base are Coast Guard, SAR and Special Forces teams who have chosen our boats as nothing else in our size and performance class can do the same job at the same speed in the weather that we can operate in.
A couple of key points:
Remember we are not a planning hull, our arc of circle hull is unique and doesn’t handle in the same way.
We don’t scrub masses of speed or efficiency because water works around our hull very differently.
We actually lose between 1% and 2% efficiency. Hugo published the fuel figures we returned during his trial in the magazine article (December 2020 edition).
Lol... I’ve seen the crack at 1.48!
I promise it isn’t! It’s marina scum from a couple of weeks in the water with no antifoul and a not so perfect wash down...
I don’t think the client would have accepted the boat if she was structurally damaged 🤣.
Happy to answer any direct questions about our boats.
Please ask on here or directly on our own UA-cam page.
Thanks for reading
Tom
Rafnar U.K.
Rafnar Maritime Group
Cool. I will check out your channel. How much of the handling and lack of slam comes from the diesel and its forward mounting and forward cg vs the hull design. It is certainly an interesting design. Another question is, why not jet? Thank you and be safe.
We like to keep the boat trimmed as flat as possible and so primary weight distribution is quite important. That said we also have outboard versions of our boats and more models coming.
Being flat helps keep our keel in the water which in turn allows the water flow around the hull to create the low pressure zones (efficiency) whilst gluing the boat down that Hugo eluded to.
LOL regarding Jets.... Ironically the boats filmed in the Motorboat and Yachting feature are the very first of this inboard version on sterndrives. Until now, all have been on jets.
Jets lose about 15% to 20% performance, but gain spectacular levels of maneuverability and handling. In this instance, the client specifically needed sterndrives.
Would the technology scale down to say a 3.5m tender/rib?
I would have loved to see a conventional RIB traveling along with you to see the difference first hand
Exactly my wish.
It’s easier just to say it’s better ;)
This video is a bit old now, but has a lot of shots of the boats running in different conditions. The sequence early on showing the lifeboat running beam on shows the hull doing what it should, but if you fast forward to 4'57 you can see an 850 in the foreground running with a similar planning boat behind.
ua-cam.com/video/kxH0PyZxDYU/v-deo.html
@@aliveoutside248 Yea, I don't buy the hull creating lift. I'd have to see proof. They couldn't have done this on much flatter water. Maybe use a lake nest time. 😁
It seems like a very nice boat, and the hull does make sense, however I do wish that they would have done it on a little rougher day, with a good hard chop to see if you could make it slam. Just running across your own wake isn't really showing me what seems to be the main selling point.
As I said, it does look like a nice boat, with a good design though !
Love to see this boat take on Haulover Inlet in Florida
.
its not tested until its tested at Haulover inlet.
Haulover Inlet at Max!!
Greymouth bar crossing video...... that is all.
This guy boat videos
1:48, For a boat that does not slam, those are some impressive cracks.
I think that is tide dirt dried
@@gaycha6589 maybe you're right, I'm watching on a phone, but the rest of the hull looks spotless.
Lol
I would imagine it's safer to maneuver too, as it mitigates the unpredictability of air travel that most RHIBs endure, and thus water impacts, giving the driver/captain greater and more consistent control. It's quite brilliant. Simple and phenomenally effective. Awesome! ☝️😎👌
That's what I was thinking... look on UA-cam and you will see all sorts of boats capsizing simply because they hit a wave wrong and got air at the wrong time. A boat like this probably doesn't have that problem.
Brilliant,I was fascinated all the way through that episode,thanks.👍
Incredible design! That guy is a genius. Thanks for the education. So much goes into it. Had no idea. Now I do!
My 11ft rib for instance
So lovely to talk Boat in the middle of winter! Great Video
I know you mentioned it, that boat will use more fuel than normal at higher speeds. There are other hulls that will do the same in light chop like this. As with other comments, put it in rough seas against a conventional RIB. I'm not saying this is bad or good....would like to see a proper test.
Fascinating boat - seems very stable indeed. I too was wondering how it would handle a rough crossing of a river bar. Seems likely to lift and punch it's way through at the same time.
Looks ready for use by the Life Boat Association and also for military use. Good review and video.
the Icelandic Coast Guard has been testing it for a while, and ICE-SAR has a few of the bigger 1100s with a closed cab already
@@BergdisNorth Thanks for the follow through.
Rafnar have quite a good promotional channel here on UA-cam. I think the Greek navy or coast guard use them.
Max, this is an old video shot in Iceland, but you can see both Coast Guard and SAR Lifeboats running in slight to moderate conditions. It's worth the 9 minutes of your life.
ua-cam.com/video/kxH0PyZxDYU/v-deo.html
Wow I'm glad you guys had an expert explaining the hull design. Also, goodbye to any kind of fuel economy
I would love to see this hull combined with a SeaAir hydrofoil system. The combination seems like it would be a match made in heaven. Foils would get the most out of that huge engine with regards to speed and fuel efficiency while maintaining the practicality and gentle ride of the RIB hull.
Try testing in rougher seas. There are a lot of hull designs that would have performed in the same manner
Yup, nothing is for free, it's just edging closer to a displacement hull and it's fugly and probably slow.
13 foot boston whaler
Jimbo Dooley agreed., it looks too commercial for individual use. Well built, I could see commercial, government and tour use. More utilitarian than anything.
An old video now, but whilst you can't see truly rough weather you do see the hull working well.
ua-cam.com/video/kxH0PyZxDYU/v-deo.html
The claim that 50m euros was invested in this should suggest someone is getting ripped off ., Is there a large government buyer of these boats that warrants spending a fortune for no good reason?
Reminds me of the hull form of a Northumberland cable deep at the bow and flattening at the stern. These are good sea boats too.
My very first boat from the early 70s had this type of hull, bow went about 6-8in lower almost forming a keel to amidships?(about halfway), then basically flat bottom with round chines to the transom. Old 40hp outboard 17ft, went faster than In Law 16ft Grew with 50hp. Turned like it was on rails and with no slide. You could watch the water slope to gunwhale which was about 4in under the lake level turning hard at full throttle. Unfortunately I cant remember how it rode I do remember having it out in 3fters and not being worried
Great design. Well done.
Awesome Hugo. Robust, commercial grade rib. Cool.
Almost an evolution towards a long keel rib. I've sailed a Folkboat derivative and experienced such liquid smoothness doing 4knts in a dirty sea it was like drifting off to sleep in a bubble bath.
This was a fascinating video. Thanks.
Nothing new here. We built RIB's just like this, didn't have the deep hull, back in the mid 80's for the Royal Australian Navy. They were 7.33m long with a mid mount Volvo, TAMD60 (from memory), duo prop stern drives. They did 40 Knots and I still remember the look on the Admirals face when we rolled one over in Sydney Harbour with a crane to show him how well it would self right and then drove it away. And you should have seen the guys we had to train in Botany Bay, they could not believe that a diesel could get up and go like it did, and it was so stable, I still have the video of my Mates skiing behind it up the Georges River. Great Times, Thanks for the memories.
A very minor observation, the sound you recorded of your voice, at speed, was spectacularly clear and clean. I was surprised and pleased. Good show, what!?
I love the the design the single lift point the engine in the center shock seats but I would love to see this thing performing the ruff seas
Marvelous!
NOW THAT IS SPECIAL.
Everyone going on about Haulover inlet, has yet to see video of places like the bar at Greymouth on the west coast of New Zealand, or any other far wilder and far woolier patch of water than that relatively mild patch of wetness.
Hi, if we ever get the chance then I would love to run a Rafnar our of Greymouth and we'd be pleased to invite you along.
@@TomBettleHSBO .....Yes please. I won't be back in little ole NZ till November next year as I'm trapped in one of the high deserts of the USA , making salty drinks for myself so I don't forget the taste of the sea but, if you guys need sentient, self loading, self adjusting ballast, I'm the semi amphibious biped you're looking for.
A good test for me out of Miami FL at Haulover Inlet to see how it really runs through various wave and current conditions
Haulover Inlet is a test of the heart, skill and nerves.
@@fredeb67 if you happen to fall overboard the water is warm. Try doing that at cape disappointment and there are some real consequences if you have issues.
@@turbolq4 I know there are areas that are worse but this place can bite you if you get over confident in your skills or boat.
It would be interesting to see how it handles Haulover inlet in Florida.
I consider that the ultimate test
Why do they always test these so called “super boats “ in calm water? My inner tube would ride that good!
You can pick the day of the shoot but you can't pick the weather
@John Patriot eagle freedom boner john all I’m saying is, impress you followers testing the boat in rough water! I’m sure you can find some. We winter in the Florida’s keys wind is always blowing there. Outside the reef you can always find 3-5 footers
I was thinking along the same lines. Although in fairness You dont know what the sea state will be 6 or 8 weeks from now. If their luck is like mine it would be dead calm and glassy smooth for 500 miles in every direction. Then the day after the review crew left it would be 30 kt gusting 50 and 6 to 8 foot seas building. This is an interesting concept. I have to wonder how much is hull and how much is diesel engine mounted way forward from other rib designs. With that much weight that far forward it has to have a large affect on the ride and handling. I would like to see the same hull with a 300 outboard on the back and the Volvo removed. Curiosity you might say. Either way the result is apparently a smooth riding, good handling boat.
@@bigdog107no2 with the greatest respect... that is a seastate 3, that's not rough. Turn that into a confused 3 to 5 metres and then you have a proper sea. Which our professional users have to operate in.
@@Big.Ron1 our 11m runs on outboards...
this is akin to when fighters first achieved mach! the fuselage had to be scalloped to allow for the air compression induced by the wings
Looks very well put together and a very interesting hull design. The hull reminds me a little of an Xtrim Rib. Shame that due to the weather I cannot see the "non slamming" behaviour.
Thanks for your comment Stefanos. Take a look at some of our videos on UA-cam. Some made with phones and in the first person, some are semi professional. On their you will find the boats running in various conditions and even if you struggle to find truly horrendous weather, you will see a number of videos showing the hull behaving as it should... gently and smoothly.
Take it for a test drive at Haulover inlet in Miami. Once I see how it handles those waves I’ll consider buying one.
I was thinking the same thing, or possibly in the Solent in UK waters.
@john doe, any UA-cam channels showing the wave action there?
@@MrRawnerves Take a look for "Haulover Boats". They have a TON of videos.
that would be some test! I'd pay to see it!
We would be delighted to bring a boat over at some point Richard.
Honestly, the boats are every bit as we describe and discuss. We work daily in far worse conditions than Haulover with our professional teams out in 5m and 6m high storm seas and still operating at tactical speeds regularly.
Tom
Rafnar UK Limited
Less of a rib more of a boat with a rubber ring, few boats doing this. Uk Border Force boats are similar in that they are a boats with a rubber rings. The hull forward keel reminds me of a fast fish, (Marlin) proven in nature. We have had bulbous bows on displacement boats (X boats) all I haven't seen is a semi displacement boat in this design. However, in nature you have fish like the Mahi-mahi (bulbous)and the Mackrell (arrow).
3:07 that flat spot is there because this boat was designed partly with the Icelandic Coast guard in mind, as a customer (Rafnar, the boat manufacturer, is also an Icelandic company).
The ICG required jet propulsion on their vessels since it's what they already use on their other boats and have been happy with it.
Rafnar had to have the ability to install water jets if they wanted to sell to the ICG and for having them help test them out.
At 1.48, it looks like there's a crack in the hull!
Waterline grime.
Sure, try it at Hullover Pass in Miami or up in Seattle Washington where the United States Coast Guard does their training. If it can smoothly run through those places I’ll be impressed.
We were first designed for use in the Arctic North Atlantic around Iceland by their Coast Guard and Search and Rescue teams who operate in any weather and conditions.
Here in the UK we run our demo boats out of Poole where our own Royal National Lifeboat Institute train. We have been out alongside them on many occasions and even out in storms that would too bad to send their trainees.
Storm Callum in late 2018 was the worst conditions that I have personally helmed our boats in. On that day we had a hard ebbing spring tide against full storm conditions which was pushing up storm waves in the 4m to 6m (12 to 20 feet) bracket. We were still operating at over 30 knots. It was horrible, but we were safe.
@@TomBettleHSBO Wow, that sounded intense. One hell of an experience.
@@jroar123 We shall try and get more of you from your side of the pond aboard Rafnar craft as soon as we can. Until we can get lots of you aboard, it just sounds like sales patter, but we are, as you may guess, truly passionate about our boats and every single one of us are involved as we sincerely believe in what they are capable of.
as a sailor, I thought this might interesting, but it looks like the same V-hull, look at some of the new sailing boats, things like reverse bows, totally flat bottom hulls for faster planning, twin hull, less drag, and sailboats doing 6o knots on foils in little wind.
Very interesting
It would be interesting to see Vripak data on this hull.
8:32 those Ullman seats look designed to deliver a nice kick to the nuts!
🤣🤣🤣
This is an extreme version of the “hook”on 1970s American jet boats. Some boats had a hook built in the keel intentionally to hold them down and ward off spin outs. Different goal( old jets ride like shit) but the principle of creating low pressure areas are the same.
dead calm seas...
... This boat handles great!
Its actually developed and designed in Iceland, hence the Icelandic name RAFNAR
As a brand we are extremely proud of our Icelandic heritage. Stormy arctic weather is in the design ethos of every boat built.
As the brand has grown and develops we now have shipyards in both Greece and with us in the UK.
He does mention that, doesn't he?
Yap, yap, yap. Let’s see it at Haulover! ;)
Very wet running boat, lots of extra fuel burned. You could achieve basically the same effect by just making the boat heavier and with a narrow V. You can also simulate this effect with a jetdrive if you put the bucket 10% in reverse, it will push the bow down but then you will also have the option not to do it on flat weather days.
I did like how smoothly it crossed that wake
Mate you’re doing rule No.1 with any load suspended off the ground.
Do not stand under any suspended load.
Pretty sure that rig is designed so you can work safely under the Hull of a boat.
I would love to see this boat at Haulover Inlet to see how it compares to all those other boats
Am I seeing stress cracks at the angled change to the horizontal surface?, there looks to be a single line running along the gel coat.
Seems like the same principle as an airplane wing, it creates laminar flow around the bottom of the hull and makes it stick tot he water.
I like the cracked hull at the stern, right underneath the chine.
Any chance of seeing it in rough seas. At least 20-30kts of wind over a long fetch would be nice. My little 14' Maritime Skiff would be perfectly safe in near calm conditions shown.
And here I thought it might be a great platform as a fishing boat.
Looks like cracked gelcoat on those edge chines (green boat on the crane in the beginning)?
Nice one. Any military applications yet? Skippers' launch, sea rescue/recovery.
Hello, just seen your question. The hull is being used globally by Coast Guard, SAR, & Special Forces operators.
Would be interested to hear if there is a need to trim the outdrive at all as it doesn’t really plane
Yes it will trim to an extent, but you can end up losing the benefits and turning it into a standard planing hull. Definitely not what we want.
@@TomBettleHSBO Excellent to know - I am exceptionally impressed with the performance I have seen. Thank you for the response and sharing the experience.
The guy who designed this revolutionary hull is an inspiration. A TRUE hero.
Yeah looks good and hope it’s a success, but would like to see how it handles real waves.
Great to hear an sensibly objective reply. Thank you. The boats were originally designed for use in the Arctic North Atlantic around Iceland with the first customers being their Coast Guard and Search and Rescue services. They operate in any weather and in any sea conditions.
Predictably, we had a nice day for our review with Hugo. If you search UA-cam under Rafnar you will see some interesting videos in mixed conditions. Some are very basic and some are semi professionally produced, but hopefully you will find some things you like.
@@TomBettleHSBO thanks will check it out, safe travels.
I will say that every boat will slam. I like the haul idea and it looks like it works well but I wish that you tested it on a rough day, or compared it to a regular cc or rib.
My Trojan 9 Meter International had the Delta Conic hull and it did not slam as well it had the flat gull wings that allowed for a shallow draft. With half tunnels for the props it would run in not hit bottom in 18 inches of water. There were Larson boats with that sort of hull as well. Nothing new under the sun.
Didn't see any trim tabs either. It would be interesting to see the fuel consumption compared to a planing hull or a semi planing hull.
Hi Jarkko, to date we have not had a need for tabs. The boats tend to be very well balanced naturally to run flatter than a typical planning hull.
We recorded 48 litres per hour at 31 knots which equates to 1.56 litres per nautical mile. This is roughly the same as a conventional 8m planing RIB fitted with a less powerful 300hp petrol outboard. I suspect that a planing hull fitted with exactly the same Volvo D6 440hp engine would be a bit quicker and more efficient but not by much.
Arc of circle. Interesting.
Looks like a more relaxed Shannon Silver Hull Design.
Basically a hull thats purpose is to do the opposite of what almost every other builder has tried to do in Airing thier hulls out for speed and efficiency.
take it to Haulover inlet Miami! we'll see if she slams or stuffs?
See how it does at Columbia River N.W organ/Washington State. Or new Zealand kaui channel during winter when rolling 50ft. White cap
First time I hear about a Volvo V6 diesel, I only know Volvo straight/inline 6 marine diesel engines. Please let me know what model the engine is.
Shall i call it a power tug? Coz a tugboats hull Seems like that. The belly has that huge engine with its hull buried down deep the water. But it would be satisfying if its tested in the inlets.
Don’t mind the massive crack in the hull at the 1:48 mark
I was just about to comment the same...
What I didn't see was much of a wake coming off the sides as you would with any other boat. I'd like to see a demo in the ocean without breakwalls cutting the ocean swell.
That is a pretty unusual hull configuration.
The hull is designed to suck down into the water but magically it doesn’t have drag... I’m not a marine engineer but I am a professional mariner. I’ve worked on boats for almost 40 years. I started as a deckhand and worked up to Captain. If the hull is being sucked into the water that is drag. This boat will burn through fuel
With normal hull design you are absolutely right.
But, take another look at the hull shape. The scalloped areas, keel and circular chines are not accidental. They don’t provide lift like those on a planing hull, but instead provide a way for the water to flow around the hull most efficiently and ultimately to create low pressure zones which allow it to stay pinned whilst being fast and efficient.
At cruising speeds we lose less than 2% efficiency over a planing hull, but with up to 95% less vertical accelerations.
Come and try her for yourself. We love to show experienced pros the difference. You can feel it when at the helm.
Obviously it's a bigger boat that the one we used to waterski behind in the 60's and 70's, a "dinky" 16' Cobia hull with a 100 HP Evinrude that *GASP!* achieved 40 kts sipping, oh, I dunno, perhaps 12 l per hour? 15?
Like to see that going downwind at pace in a proper chop.
Search our videos online. I'm sure something in there will interest you.
First thing I noticed was the hull crack. @1:45
I'll believe it when the pilot boats or the RNLI start using it.
nobody should have that much money. beautiful design.
Here in Florida we call that a “hook” in the hull. It happens in old Jon boats after years of going over logs. Causes the boat to eventually bury the nose the faster you go. Does help with the chop, but kills speed.
Haulover inlet footage?
How does that effect fuel efficiency? Seems like it would cause a great deal of drag.
A good coat of wax-on-wax-off will take care of drag
Just spotted your question. Due to the hull shape the water actually flows around the hull with more efficiency than a planing hull. It's this effect that causes a low pressure area that in turn allows for us to reach high speeds in a relative displacement mode. In fact, at up to about 27 knots we are somewhat more efficient than most planing hulls as we are not using Hp and burning fuel simply to haul ourselves onto the plane. As you move through 30 knots we do start to transition to more of a planing style and at that point fuel consumption does begin to climb but, it stay within relatively sensible boundaries.
Looks like all they did is add a hook to the hull which is something that is typically considered bad and is very easy to add to your boat if the stringers are done wrong
Looks like the Shannon Silver Hull design.
I would like to see it hitting waves side-by-side with a "normal" hulled version to compare the bouncing or slamming.
Les, university of Iceland tested side by side with a typical deep vee and the results showed up to 20x less vertical accelerations.
@@TomBettleHSBO do you have video?
@@lesmorrisett7639 I have the full independent report written by them. They weren't carrying out the review for marketing reasons, but for study.
However, if you hunt youtube you will find a lot of videos, some semi pro, some DIY of the boats being used in mixed and poor conditions.
I would like to see it at haul over
Forgot to mention the damage to the pocket book.
Nice ! but the sea was not choppy at all... i would have prefered trials on rough sea...
yeah sorry mate i dont feel it i mean the old fjords also didnt slam
i dont really see it as a game changing hull no matter how much money he threw at it
it seems to ride weird and this is in good weather i have no confidence it is any good in the rough
I wonder how that hull is going to handle beaching ops. Lol
We have videos on our various channels of beaching.
Are these Ragnar's tenders?
I'd like to see how she behaves in the rough stuff. Looks like it's pushing a lot of water and wasting energy but if it's better for disabled people then it can only be a good thing.
This hull principle was already invented by Shannon boat more the 10 years ago.Rafnar have just modified it
Interesting design, nice to see somebody moving forward with RIB design. We had an ex us Military Zodiac Hurricane 733 with inboard diesel, very rarely slammed in the 10 years we ran it. This included needles tidal race in 40 knots of wind etc. Great boat and looked allot better than this behemoth.
That isn’t a surfboat for sure. Very nice that it doesn’t slam like other vessels...
What is the deal with the crack in the hill near the bow?
Hi Joe, it's not a crack... we'd never have got the boat accepted by the yacht on handover if it was.
It's marina scum that was not so brilliantly washed off by the lift out crew. It does look very much like a crack though I grant you that.
Ok thanks for clarifying. It looks like you have a very interesting hull design. Good luck.
is it cracked on top edge?
I wonder how many K.G's can be loaded onto it in South America before it slams
Take it to haulover inlet in Florida and see if it don't slam there LOL
Show it going out Haulover Inlet when the tide's running... that will be a Real test.