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29-11-2020, 09:18
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#1
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Registered User
Join Date: Dec 2013
Location: Leavenworth, KS
Boat: 2011 Lagoon 450F
Posts: 1,147
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Throttle Fwd But engine in reverse
Can anyone explain how a throttle can be in the forward position, but the boat goes in reverse? Tried to move my boat today and the starboard engine would go in reverse when my throttle is pushed forward..
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29-11-2020, 11:18
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#2
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Registered User
Join Date: Aug 2013
Location: New Orleans, LA
Posts: 414
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Re: Throttle Fwd But engine in reverse
Do you have 2 engines with counter-rotating props? Do you have a prankster nearby who wanted to watch the show? If you switch the 2 props in such a situation, the boat will go forward when the controls are in reverse, and vice versa.
Don't ask me how I know! I was innocent!
But if only one engine is doing this, could someone have actually removed and put the prop on backwards? If this just started happening and all was fine before, I have no suggestions on how this could have occurred.
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29-11-2020, 11:20
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#3
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Registered User
Join Date: Aug 2006
Location: Skagit City, WA
Posts: 25,453
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Re: Throttle Fwd But engine in reverse
Someone put the wrong hand prop on!
Did that on my first build....
OK, I guess it's a new problem for you.... hmmm, feathering props? loaded with barnacles or something?
__________________
"I spent most of my money on Booze, Broads and Boats. The rest I wasted" - Elmore Leonard
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29-11-2020, 11:28
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#4
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Moderator
Join Date: Aug 2009
Location: Solent, England
Boat: Moody 31
Posts: 18,398
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Re: Throttle Fwd But engine in reverse
Quote:
Originally Posted by Bullshooter
But if only one engine is doing this, could someone have actually removed and put the prop on backwards?
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They might have done the job properly and swopped the hydraulic steering lines over at the same time, now that would be really interesting to video Not that I have ever done that you understand
Pete
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29-11-2020, 11:48
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#5
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Registered User
Join Date: Oct 2014
Posts: 7,310
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Re: Throttle Fwd But engine in reverse
That would be called your other forward!
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29-11-2020, 11:55
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#6
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Registered User
Join Date: Jan 2010
Location: On Vessel WINGS, wherever there's an ocean, currently in Mexico
Boat: Serendipity 43
Posts: 5,508
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Re: Throttle Fwd But engine in reverse
Quote:
Originally Posted by scarlet
Can anyone explain how a throttle can be in the forward position, but the boat goes in reverse? Tried to move my boat today and the starboard engine would go in reverse when my throttle is pushed forward..
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If that starboard engine is in reverse regardless of the gear handle position (meaning that no matter which way you move the handle it stays in reverse) then possibly the control cable to the starboard transmission has broken and it is not really changing the gear.
Another possibility (but you would know if this type of work was done) is that the single lever control was removed for servicing and reinstalled with the lever on backwards.
Or maybe a failure in the internal linkage in the saildrive.
__________________
These lines upon my face tell you the story of who I am but these stories don't mean anything
when you've got no one to tell them to Fred Roswold Wings https://wingssail.blogspot.com/
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29-11-2020, 12:10
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#7
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Registered User
Join Date: Jan 2019
Location: Minnesota, USA
Boat: 21' trailer sailor & 8' sailing dinghy
Posts: 1,742
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Re: Throttle Fwd But engine in reverse
Scarlet, does the boat have a throttle and gearshift for each engine?
Was the boat worked on recently where something could have been switched?
__________________
Big dreams, small boats...
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29-11-2020, 12:40
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#8
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Registered User
Join Date: Jan 2015
Location: Alaska
Boat: Boatless
Posts: 928
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Re: Throttle Fwd But engine in reverse
Props on backwards?
__________________
www.sailingohana.com
"Take it all in, it's as big as it seems, count all your blessings, remember your dreams" JB
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29-11-2020, 12:50
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#9
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Registered User
Join Date: Jan 2010
Location: On Vessel WINGS, wherever there's an ocean, currently in Mexico
Boat: Serendipity 43
Posts: 5,508
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Re: Throttle Fwd But engine in reverse
Quote:
Originally Posted by akprb
Props on backwards?
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The prop would lose efficiency but still drive the boat in forward. The only way for the boat to go backwards is if the shaft is turning the other direction.
__________________
These lines upon my face tell you the story of who I am but these stories don't mean anything
when you've got no one to tell them to Fred Roswold Wings https://wingssail.blogspot.com/
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29-11-2020, 13:08
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#10
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Registered User
Join Date: Jan 2015
Location: Alaska
Boat: Boatless
Posts: 928
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Re: Throttle Fwd But engine in reverse
Then wrong hand?
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29-11-2020, 13:25
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#11
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Registered User
Join Date: Oct 2014
Posts: 7,310
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Re: Throttle Fwd But engine in reverse
Quote:
Originally Posted by wingssail
The prop would lose efficiency but still drive the boat in forward. The only way for the boat to go backwards is if the shaft is turning the other direction.
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Quote:
Originally Posted by akprb
Then wrong hand?
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+1 on both.
Reversing the mounting only adversely impacts the efficiency of the foil. It would not change its direction of thrust.
View image below of left and right hand propellers, and how they look if mounted in reverse as to fore and aft direction.
Ether wrong handed prop, or wrong direction of shaft rotation. Wrong direction of shaft rotation would be due to improper linkage or throttle connections.
"Your other forward!"
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29-11-2020, 14:03
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#12
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Marine Service Provider
Join Date: Nov 2008
Location: Port Credit, Ontario or Bahamas
Boat: Benford 38 Fantail Cruiser
Posts: 7,047
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Re: Throttle Fwd But engine in reverse
Quote:
Originally Posted by scarlet
Can anyone explain how a throttle can be in the forward position, but the boat goes in reverse? Tried to move my boat today and the starboard engine would go in reverse when my throttle is pushed forward..
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Do you have an upper and lower helm. if so look at the junction. if the mounting is loose/insecure, all sorts of bad things can happen
__________________
If you're not laughing, you're not doin' it right.
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29-11-2020, 14:21
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#13
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Registered User
Join Date: Dec 2013
Location: Leavenworth, KS
Boat: 2011 Lagoon 450F
Posts: 1,147
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Re: Throttle Fwd But engine in reverse
Quote:
Originally Posted by Cheechako
Someone put the wrong hand prop on!
Did that on my first build....
OK, I guess it's a new problem for you.... hmmm, feathering props? loaded with barnacles or something?
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So.... It's a catamaran and it hasn't been out of the water. I have folding props and barnacles could be a problem.
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29-11-2020, 14:22
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#14
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Registered User
Join Date: Dec 2013
Location: Leavenworth, KS
Boat: 2011 Lagoon 450F
Posts: 1,147
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Re: Throttle Fwd But engine in reverse
Quote:
Originally Posted by Spot
Scarlet, does the boat have a throttle and gearshift for each engine?
Was the boat worked on recently where something could have been switched?
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Yes.... And no.
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30-11-2020, 09:05
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#15
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Registered User
Join Date: Feb 2018
Location: Friday Harbor WA USA
Boat: Sea Sport Voyager 30'
Posts: 107
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Re: Throttle Fwd But engine in reverse
Before we get too far with ideas, let’s get some background.
Has this just suddenly started? When was the last use of the boat? I assume it didn’t happen then? Did you have the engines recently serviced? If so, what work was done, I.e., would the mechanic have worked on the shift assembly, actuator, cables, etc.?
Tell us about the boat’s usage leading up to this. Thanks.
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