Re: Furler motor to gearbox sm2000
With all due respect, Amel didn't "design" the gear train, they only specified it.
Both the Leroy Somer and Bongifoli(?) units are standard production industrial motor gearbox units used in factories for example as conveyor drivers. They are nothing special. And there are plenty of alternatives out there. Cheers Alan Elyse SM437 On my way to New Zealand today to be reunited with my beautiful boat after more than a year !
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Re: Warning about "UFOs"
eric freedman <kimberlite@...>
Can’t Hoit !!
From: main@AmelYachtOwners.groups.io On Behalf Of Danny and Yvonne SIMMS
Sent: Thursday, May 13, 2021 3:31 PM To: main@AmelYachtOwners.groups.io Subject: Re: [AmelYachtOwners] Warning about "UFOs"
Hi Eric, that impact would have sunk a lesser boat. I have no idea if it is sensible but I run my forward looking sonar at sea, not expecting to see a whale ahead but that the sonar may warn a whale of my approach. Foolish? Don' know but I've never hit a whale Danny SM 299 Ocean Pearl
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Re: Warning about "UFOs"
Peter Killen
Hi All,
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Some years ago we were en route from SW Ireland to the Azores. Conditions were not great, with a fairly big sea running and very misty. We were about 600 miles from our destination and didn’t see the container, which had only one corner awash, and covered in seaweed, poking up out of the sea, until we were about 50 metres abeam of it. A nasty surprise! We sailed approximately 80k miles in Pure Magic, and many more miles in other boats, but never had a similar incident before or since. Peter Previous owner of SM Pure Magic 433
On 13 May 2021, at 20:31, Danny and Yvonne SIMMS <simms@...> wrote:
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Re: Warning about "UFOs"
Danny and Yvonne SIMMS
Hi Eric, that impact would have sunk a lesser boat. I have no idea if it is sensible but I run my forward looking sonar at sea, not expecting to see a whale ahead but that the sonar may warn a whale of my approach. Foolish? Don' know but I've never hit a whale Danny SM 299 Ocean Pearl
On 14 May 2021 at 03:54 eric freedman <kimberlite@...> wrote:
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Re: New (and proud) owners of SY-Kolibri - #174
Wonderful. Best, CW Bill Rouse Amel Owners Yacht School +1 832-380-4970 | brouse@... 720 Winnie, Galveston Island, Texas 77550 www.AmelOwnersYachtSchool.com Yacht School Calendar: www.preparetocastoff.blogspot.com/p/calendar.html
On Thu, May 13, 2021, 8:18 AM Roque <ediroque@...> wrote:
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Re: Warning about "UFOs"
eric freedman <kimberlite@...>
While Sailing West of Africa towards the Caribbean we were surfing down the waves in the Trade Winds using our gennaker one day we averaged 10 knots. At first, I did not see it, But I hit a whale in the middle of its body. It stopped us dead and I heard it hit the boat twice. I assume it first hit the bow and then the keel, The stop was so sudden that one crewmember flew from the saloon to the forward berth without injury. I started the engine to warn any other whales. We were checking the bilges but based upon the configuration that would be of little help.
As the whale went by it was much bigger than Kimberlite. I looked it in the eye, and it seemed to give me a dirty look, I also think he flipped me the flipper. The seas were large so I could not dive at that time. 2 days later I dove on the boat and everything was where it was supposed to be and now after 15 years everything is still AOK. Fair Winds Eric Kimberlite Amel Super Maramu #376
From: main@AmelYachtOwners.groups.io On Behalf Of Bill Kinney
Just a word of reassurance. This topic is one that comes up all the time, and is passed around the sailing world and it seems to grow larger and more panicked with each telling. It's is a great boogy-man story because it has the evil, greedy shipping companies as the villains and the poor smallboat sailor as the helpless victim.
On the other hand, I know personally of two boats that sunk after hitting whales, and two others that were disabled after whale strikes. I have been on a boat that hit a whale, thankfully without consequences. By my reckoning, whales are at least 50 times more dangerous to small boats than shipping containers, and the risk of boats hitting reefs are at least 50 times higher again.
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Re: Furler motor to gearbox sm2000
Matt & Michelle
When I pulled the outhaul motor and gearbox off of Talia back in Feb (before I pitched myself from the mizzen mast), the shaft was sheared before the first shaft step behind the keyway. You can see the stress rings on the shear plane of the shaft. They start at a single point. I could not tell if it was corrosion, or an inclusion without polishing. However, an inclusion on the surface of the shaft would be very odd. I still have the motor and shaft, and will pass along a few pictures when I can get back to the boat in June. I will see if I can polish the shear surface as well for fun.
Not sure I buy the wear on the gear teeth and side loading with a bonze tooth gearbox. I fully expected to see wear on the teeth, following BWs book. There was little to no wear presence and the tooth convolutes were clean and mirror like when washed down. I also can't reason AMEL designing a drivetrain where the gearbox is the failure mechanism . No self respecting Mech Eng would do that. Your coupling/keyway should fail first, followed by your easily changed electric motor. I think AMEL has done a fine job designing this geartrain, and Gary did a great maintaining the boat prior to my owning it. But, on this specific boat the motor shaft red herring failed.
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Re: Super Maramu length of the Long Pole
Bill Kinney
I suspect (but can not prove!) the reason of the change (we have the long poles) was simply to allow the securing the forward end of the pole to the pin on the stanchion without reworking the whole lifeline system. With the long poles the forward end of the pole is captured in the liferail and while it can not escape, it certainly CAN bounce up and down. We had some fiberglass crazing from this. We added pads of Treadmaster to cushion the rail where the pole rests.
What I found interesting, is after shortening the poles by a half meter, there was no change in the size of the genoa or balloner. Having sailed with both, I can't say I notice a difference. Bill Kinney SM160, Harmonie Hollywood FL
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Re: New (and proud) owners of SY-Kolibri - #174
Hella and Herman Welcome and enjoy Kolibri! Roque Attika A54 117 Paraty- Brazil Em qui., 13 de mai. de 2021 às 11:48, Courtney Gorman via groups.io <Itsfun1=aol.com@groups.io> escreveu:
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Re: New (and proud) owners of SY-Kolibri - #174
Congratulations enjoy the adventure 👍🏻😁
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On May 13, 2021, at 10:26 AM, Mark Garver via groups.io <mgarver@...> wrote:
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Re: Furler motor to gearbox sm2000
Bill Kinney
I think "stress corrosion cracking" is a red herring here. While carbon steel certainly can corrode rapidly in salt water, the chemistry just is not the same as with stainless alloys that stress crack in the presence of chloride. If there was enough salt water bouncing around in the motor housing to seriously corrode the shaft, I would expect LOTS of other issues to go south first! This would be easy to confirm with a look at a sheared-off shaft. (Anybody have a photo?)
In normal operation the motor simply can not develop enough torque to shear off the shaft. I have certainly stalled the outhaul motor many times while flattening the sail without a mechanical failure. While it might be possible that there was an epidemic of bad steel bar stock for motor shafts, this seems very unlikely. I have never done a post-mortem on one of these that has failed, so all this is a guess... There are two possibilities I see, both related to wear in the gear box. A worn or broken bearing could allow enough runout of the worm screw that it imparts a significant side loading on the motor shaft. This could result in a failure of the kind seen. I think this is the most likely cause. Another possibility is either by wear of the gear teeth, or a bearing failure, the worm suddenly jams in the gear while running at speed. I can imagine this kind of shock loading causing a shear failure. I don't see this happening by an external load, the 60:1 gear ratio would just not transmit enough of a shock load back to the motor--but you never know... Again, all just SWAG (Scientific Wild Ass Guessing) without having a failed unit in hand. It also appears incorrect to say that older boats had Bonfiglioli and new ones had Leroy-Somers drive trains (or vice versa). Amel seems to have switched back and forth during the production run. Our boat (#160) has Leroy-Somers, and I have seen higher hull numbers with either supplier. Bill Kinney SM160, Harmonie Hollywood, FL
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Re: New (and proud) owners of SY-Kolibri - #174
Welcome to a wonderful group of Amel owners and congratulations!
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Mark and Jennifer Garver S/V It’s Good SM #105
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New (and proud) owners of SY-Kolibri - #174
Herman Goverse
Hello all,
Guess we will find some help and advise on this forum in our journey in sailing and maintaining Kolibri.
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Re: Furler motor to gearbox sm2000
Matt & Michelle
Most electric motors use mild steel shafts (I doubt the electric motors on the AMEL have nickel or nickel-vanadium shafts due to cost). The shafts are designed for an infinite life in a controlled environment, given the design torque of the motor/stator. We have all seen how mild steel can corrode in sodium rich environment. The pitting that can occur from the sodium ingression can limit the design life at the design torque due to stress corrosion cracking.
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Re: Furler motor to gearbox sm2000
Hi Mike, mine sheared when I was unfurling the sail. Still confused about how this was possible. I replaced the gearbox and motor with the Bongifoly. See if it works for as long.
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Amel used these on the earlier versions of the SM
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Re: maramu and santorin owners - what size dinghy do you have an where do you store
Good morning,
We have a 9 foot Caribe dinghy with fiberglass single bottom. Stored on top of the aft cabin while underway and towed in calm waters. While at the marina it sits also on top of the aft cabin, but some other Maramu owners I´ve seen use a spinnaker halyard to raise the dinghy from the bow and keep it forward of the main mast (semi hanging), resting on its stern. We have a 15 hp Yamaha 2 stroke engine with this dinghy, place on the rail while sailing. I once used a 12 foot dinghy one time, and that went on the deck forward of the main mast. It is an awkward location not very good for visibility. No davits on our boat. -- Alex Paquin S/V " SIMPATICO" Amel Maramu Hull #94, 1981
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Re: maramu and santorin owners - what size dinghy do you have an where do you store
Herbert Lackner
Hi Eric,
we use a 3D Tender 270 Hypalon Ultra Light (39kg). It fits perfect on the aft cabin top fully inflated, and we are very happy with the decision. During passages the dinghi on the aft cabine makes the cockpit even more "cosy" and gives extra protection. We use a light 9,8 Tohatsu 2-stroke engine (25kg), very fast and also good with some waves. https://www.nootica.de/schlauchboot-3d-tender-ultra-light-rib-hypalon-270.html herbert SN120
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Re: maramu and santorin owners - what size dinghy do you have an where do you store
Eric Meury
Ian do you have the 15 or 17 inch tubes and do you mean the 290...i think they only made a 260 and a 290?
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Re: Warning about "UFOs"
Hi Bill, thank you for your words. I fully agree. During my time as chairman of the German Trans-Ocean e.V. from February 2012 to November 2019 I´ve got no report of a collision with a container by one of our sailing members. (Trans-Ocean e.V. is an association of blue water sailors with some 4.500 members.) The only reports in this period had been:
During the circumnavigation we did between 2004 and 2009 we had several close encounters but no collision to
Once we hit something while running the engine. But I could´nt see nothing. But for sure it was not a container. It is as you say. There are much more other risks which are more dangerous than containers but we are used to deal with. And most of the risks you will find close to shore. Fair winds Martin
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Re: maramu and santorin owners - what size dinghy do you have an where do you store
Andy Croney
Hi Eric, we have a Ribeye TS280 RIB , we have Davits so for short trips we lift it - for longer passages it sits on the aft cabin top .
All the best without decisions. Andy Maramu’s 8#75 SV Paladin
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