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Old 29-11-2020, 10:18   #1
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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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Old 29-11-2020, 12:18   #2
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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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Old 29-11-2020, 12:20   #3
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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?
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Old 29-11-2020, 12:28   #4
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Re: Throttle Fwd But engine in reverse

Quote:
Originally Posted by Bullshooter View Post
But if only one engine is doing this, could someone have actually removed and put the prop on backwards?
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

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Old 29-11-2020, 12:48   #5
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Re: Throttle Fwd But engine in reverse

That would be called your other forward!

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Old 29-11-2020, 12:55   #6
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Re: Throttle Fwd But engine in reverse

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Originally Posted by scarlet View Post
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..
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.
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Old 29-11-2020, 13:10   #7
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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?
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Old 29-11-2020, 13:40   #8
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Re: Throttle Fwd But engine in reverse

Props on backwards?
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Old 29-11-2020, 13:50   #9
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Re: Throttle Fwd But engine in reverse

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Originally Posted by akprb View Post
Props on backwards?
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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Old 29-11-2020, 14:08   #10
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Re: Throttle Fwd But engine in reverse

Then wrong hand?
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Old 29-11-2020, 14:25   #11
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Re: Throttle Fwd But engine in reverse

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Originally Posted by wingssail View Post
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.
Quote:
Originally Posted by akprb View Post
Then wrong hand?
+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.

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Old 29-11-2020, 15:03   #12
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Re: Throttle Fwd But engine in reverse

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Originally Posted by scarlet View Post
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..
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
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Old 29-11-2020, 15:21   #13
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Re: Throttle Fwd But engine in reverse

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Originally Posted by Cheechako View Post
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?
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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Old 29-11-2020, 15:22   #14
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Re: Throttle Fwd But engine in reverse

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Originally Posted by Spot View Post
Scarlet, does the boat have a throttle and gearshift for each engine?
Was the boat worked on recently where something could have been switched?
Yes.... And no.
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Old 30-11-2020, 10:05   #15
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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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