Re: Sharki shaft alternator
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Interesting thread !
I have been using the shaft alternator lots over the last 8 months.
My Hurth gearbox manual seems to suggest that it should be left to idle (regardless of the Amel propshaft alternator) but I assume this is very gearbox specific. So I run my gearbox in neutral even without the alternator ‘on’
Does anyone known if idle in reverse or idle with the gearbox lever fwd makes a difference? Or is idle just idle - if you don’t have a MaxProp that is?
When coming out of idle I try and slow the boat down 1st to reduce gearbox forces as it moves into gear.
All the best
On 10 Mar 2019, at 21:39, amel46met <onboardaphrodite@...
Thanks for the information
Will give it a try with this good Caribbean wind
Maramu # 125
On Mar 10, 2019, at 8:36 PM, Warren Traill <trailz@...
Interesting information Olivier. I have another question. My propeller is fixed. And I have no shaft a;ternator.
When I am sailing the shaft continues to rotate.
Is it good practise to engage reverse to stop the shaft rotating if I wish. Or is there some potential for damage?
the prop shaft alternator can work with a MAXPROP. It is a bit tricky, but you should try this:
-while sailing (above 4 knots), start the engine and engage reverse idling
-while your engine is reversing, turn ON the key switch of your alternator
-then set the engine to neutral and stop it
Your MAXPROP should keep the reverse position unless:
a) your batteries are charged enough and the alternator will not oppose much power to the prop, therefore the prop will spin faster and will finally open and the shaft will
b) your boat speed is high (while surfing) and the prop will spin faster and will open
Does anyone in the group use a Max Prop with the shaft alternator I have read that it does work any tricks?
Thanks Ian. I am struggling to get to grips with the electrical system. The engine/starboard alternator is charging but not sure about the domestic/port alternator
and I dont really understand the data my shiney new clamp meter is giving me. I need to read a book I think.
Sent from my Samsung device
-------- Original message --------
From: Ian <parkianj@...>
Date: 08/03/2019 11:52 (GMT+00:00)
Subject: Re: [AmelYachtOwners] Sharki shaft alternator
On my Santorin you have to put the key in and switch on (next to your ameter). The green light comes on. It sends a current to the alternator to excite it and start it charging. You should turn off when finished using it and put your gear lever in reverse to
stop the alternator charging before switching on the engine.
I believe the diodes in each of the engine and alternator should prevent any ‘issues’, but that is the prescribed Amel method.
My knowledge of electrics is limited - someone with a better understanding may chip in here.
The Santorin prop shaft pulley is quite a bit bigger too, so will turn the alternator faster. There is a significant drop in prop shaft speed as soon as you turn the alternator on.
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