Re: Main Furler - Sail stuck / jammed
With a winch handle locked into the manual furling socket and a line around it to the base of the mast to prevent it from turning.
Alan Elyse SM437
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Re: Main Furler - Sail stuck / jammed
Santorin LO
As suspected and expected - did Bills's step by step, literally in 5 mins crisis is over!
Thanks you all. Now another thing, the gear seem to be weak / maybe finished (from before the episode), and looks like will have to do at least one leg without. Now when easily furling/unfurling manually, was thinking - how to 'lock' furled in sail without fitting the gear back to its place???
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Re: A question about coppercoat
Paul Dowd and Sharon Brown
Many thanks to all for the feedback on this. I can now happily leave the scraping until we get back to Grenada.
Cheers, Paul S/Y Ya Fohi - Amel 54 #98 - Grenada
From: main@AmelYachtOwners.groups.io <main@AmelYachtOwners.groups.io> On Behalf Of Ian Park
Sent: 30 October 2020 09:33 To: main@AmelYachtOwners.groups.io Subject: [AmelYachtOwners] A question about coppercoat
-- Cheers Paul Ya Fohi - Amel 54 #98
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A question about coppercoat
Ian Park
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Re: Bow Thruster Amps rating.
jlm@jlmertz.fr
SM 316 with 8 100Ah battery ... JLM Le 30/10/2020 à 06:42, eric freedman a
écrit :
Hi Jean Luc,
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Re: Bow Thruster Amps rating.
eric freedman
Hi Jean Luc,
toggle quoted messageShow quoted text
What model Amel do you have? Fair Winds, Eric Sm 376 Kimberite
On October 30, 2020 at 1:21 AM "jlm@..." <jlm@...> wrote:
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Re: Bow Thruster Amps rating.
jlm@jlmertz.fr
On CottonBay I messured in the past the bow thruster curent : https://amelyachtowners.groups.io/g/main/photo/84720/1?p=Created,,,20,2,0,0 Jean Luc CottonBay
Le 29/10/2020 à 21:46, Karen Smith via
groups.io a écrit :
Our SM#160 bow thruster draws about 485 Amps when it is running. The exact power calculation is complicated because the voltage is not steady at 24 volts, but drops quickly, and significantly, under this load. The reason the wire looks undersized by standard calculations is that it operates on a very short duty cycle, so heating of the wire is minimal. If you were to try to push 500 Amps through that wire for an hour, you'd have a real problem.
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Re: Bow Thruster Amps rating.
Karen Smith
Our SM#160 bow thruster draws about 485 Amps when it is running. The exact power calculation is complicated because the voltage is not steady at 24 volts, but drops quickly, and significantly, under this load. The reason the wire looks undersized by standard calculations is that it operates on a very short duty cycle, so heating of the wire is minimal. If you were to try to push 500 Amps through that wire for an hour, you'd have a real problem.
At least on our boat, the "bow thruster" cable carries all the 24V power to everything forward of the forward saloon bulkhead. Mast and genoa furlers, cabin lights, nav lights, windlass... We have fused our battery bank in two different ways, and both worked well. Keep in mind we have a bank of 4 pairs of batteries, smaller than yours which I believe is 6 pairs. Our batteries were first fused with four 125 Amp rated battery terminal fuses, one on each 24V positive, for a total of 500 Amps. With 6 pairs of batteries you'd end up in the about same place with 80 or 90 Amp rated fuses. When we changed battery brands, the terminal fuse holders no longer fit under the battery box lid, so we switched to a singe 500 AMP ANL-style fuse. Never have any of these tripped. We have also reworked the whole 24 volt distribution system so EACH of the wires leaving the battery box has a fuse appropriate to its ampacity, and the switches now interrupt current to everything except the bilge pump circuit. To me this is a really basic safety issue. If there was ever to be an electrical fire on the boat, or a piece of runaway equipment, I need to know I can shut off the power to everything without delay. On the boats I have seen, Amel was very inconsistent about what wires they connected to which side of the main switches. On our boat, only the battery charger, bilge pump, and "always on 12V converter" were connected to the unswitched side. I think on later boats they just ran out of space on the stud on the switched side, so were forced to move wires to the unswitched post. Bill Kinney SM#160, Harmonie Annapolis, MD
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Re: Main Furler - Sail stuck / jammed
Santorin LO
Agree - but this mainly apply to no normal furl / unfurl under normal circumstances. this must be the reason that in 10 years never had this issue before...
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Re: Main Furler - Sail stuck / jammed
Santorin LO
Thanks again Bill (and Matt) - your way seem to be the one as well as your observation re the problem description, the one thing I am very confident about, is that if your way doesn't work and you wouldn't be able to suggest another way - no one will...
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Re: Main Furler - Sail stuck / jammed
The trick I have found is to make sure there is plenty of outhaul tension. It needs to be tightly rolled in and out, always keeping the outhaul as tight as possible. Keeping a really good eye on it even when it is calm. I have also found that there needs to be loads of downward tension on the leech. On my 54 I use kicker tension in addition to sheet and track to keep that leech tension tight. If for a moment I do not pay close attention then a jam ensues. Ironically the stronger the wind the less likely a jam. Maybe it is the concentration of the mind rather than anything else. Nick Amelia Amel54 -019 Leros Gr
On 29 Oct 2020, at 20:13, Matt Salatino via groups.io <helmsmatt@...> wrote:
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Re: Main Furler - Sail stuck / jammed
We furled too loosely and jammed once. We got ours loose the same way. Back and forth, tighten the furler, tighten the outhaul, loosen a bit, then repeat... a lot.
toggle quoted messageShow quoted text
~~~⛵️~~~Matt
On Oct 29, 2020, at 2:04 PM, Courtney Gorman via groups.io <Itsfun1@...> wrote:
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Re: Bow Thruster Amps rating.
eric freedman
The bow thruster is If I recall correctly is 10 HP. 10 hp x 746 watts is 7460 watts without any loss .I would add at east 10% for that, 8200 watts/24=342 amps.
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That would be dismissing and loss in the feed to the motor. If you look at the motor you will see multiple heavy gauge wires going to the motor. Fair Winds Eric
On October 29, 2020 at 2:38 PM Philippe Belloir <pbelloir@...> wrote:
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Re: Bow Thruster Amps rating.
Chris, We shouldn't get into a discussion of what is right or wrong, but rather work to help you. Maybe the math is French math or Texan math, but it will draw as much as around 500 amps. Additionally, the bow thruster wire from the battery switch to the bow thruster is connected to the battery side of the switch. You might consider a batter terminal fuse for each battery. That would be my suggestion. In addition, you might also consider a 500 amp time-delay fuse located near the bus bar located near the bow thruster at the termination of the wire from the battery switch.
On Thu, Oct 29, 2020 at 1:23 PM Chris Doucette <amaroksailing@...> wrote:
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Re: Bow Thruster Amps rating.
It s forbidden to violat W=VxA, :-) so you have to make a deal with 7000 and/or 510. I guess 24 is right. Possible you can see W on the motor ? Philippe Belloir +33 781 709 791
-------- Message d'origine -------- De : Chris Doucette <amaroksailing@...> Date : 29/10/2020 19:23 (GMT+01:00) À : "main@AmelYachtOwners.groups.io Group Moderators" <main@amelyachtowners.groups.io> Objet : [AmelYachtOwners] Bow Thruster Amps rating. Hi- maybe someone can help me understand... The Super Maramu 2k Manual shows that the bow thruster draws 7000W and 510A at 24V. Is this correct? If so, how does the math work out? W=VxA is violated AND no reasonable wire size is rated for that 24v DC..\ I am trying to properly fuse my battery bank and this beast is the crux. Chris SV Amarok 285
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Bow Thruster Amps rating.
Chris Doucette
Hi- maybe someone can help me understand... The Super Maramu 2k Manual shows that the bow thruster draws 7000W and 510A at 24V. Is this correct? If so, how does the math work out? W=VxA is violated AND no reasonable wire size is rated for that 24v DC..\ I am trying to properly fuse my battery bank and this beast is the crux. Chris SV Amarok 285
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Re: Main Furler - Sail stuck / jammed
Santorin LO
Thank You Bill, Ian and Courtney,
Tried all already, except of releasing the gear and try manually - will give it a go tomorrow morning and will update.
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Re: Main Furler - Sail stuck / jammed
You have a problem that probably includes the sail twisted backwards on the foil. The guy might be a good electrician, but keep him off the boat. Drop the motor and gearbox about 30mm by loosening the 4 bolts Untie the mainsail from the outhaul. While pulling on the clew of the mainsail, use a winch handle in the manual furler turning a little clockwise and anticlockwise until you have all of the sail unfurled. You may have to go up the mast to pull the sail out. 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
Hi Bill,
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Re: Main Furler - Sail stuck / jammed
Start by furling as tightly as possible then streach the out haul loosen and repeat
toggle quoted messageShow quoted text
On Oct 29, 2020, at 2:00 PM, Ian Park <parkianj@...> wrote:
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Re: Main Furler - Sail stuck / jammed
Ian Park
Do as Bill says and use the winch handle, but on my previous boat (not AMEL) the furling main jammed a few times - usually when rolled too loosely. I found it helped to pull downwards hard on the leach of the sail. You may need to release or slacken the short rope on the clew first. It may help too if someone can reach up and push the sail/foil inwards (away from the mast slot). Good luck.
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