Boarding the 26M using the motor

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SKIPPER2C
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Sailboat: MacGregor 26M
Location: South Africa

Re: Boarding the 26M using the motor

Post by SKIPPER2C »

No. I do bring the rudders up in shalom water , as the manual intend. Rudders works fine just needs managing.
When i started the mod, i had to make a decision.
1) to change the rudder to sum-thing like the HAKE yachts have.
2) or change the steering system to a power steering. 1pump and 2 outlets with valves so the motor and rudders who'd work on its own. ( still have to do it)
Seems doable. In the meantime i enjoy my :macm: tremendously and the dive platform makes so a big improvement that i will do whatever it takes to get the rudders to work 110%.
Would need all the advice i could get. PLEASE :( ????
Maybe extend the hull with fiberglass ,with the dive platform as support and move the rubbers to the end.
Sorry Ixneigh :x for hijacking your post. Will start a new post.
Renier
From the best waters to scuba dive in the world. Reefs untouched and still wild . Somalian Pirates :evil: scare luters . MOZAMBIQUE
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Ixneigh
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Sailboat: MacGregor 26M
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Re: Boarding the 26M using the motor

Post by Ixneigh »

Help my Post has been hijacked by pirates!! :D :wink:

Both models of power sailor need refinement for getting on and off especially with something bulky like a dive tank. I would not even attempt reboarding my boat in gear like that. I would like a compromise between a very extensive mod such as this, and nothing. I think for me that will mean a custom made stern ladder that hangs or extends all the way to the water and is made to fit on the back corner of the boat. I do not have the stern rail seats for this reason. Eventually I will make or have one fabricated out of (wait for it) foam core 8)

Ixneigh
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Tomfoolery
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Re: Boarding the 26M using the motor

Post by Tomfoolery »

FWIW, I did a napkin calc on the force it takes to push a boat (any boat) 15 mph with 40 hp converted to thrust, which works out to around 1000 lb of prop thrust. I assumed 10 hp (of a 50 hp OB) is lost in friction. Could be more, could be less, depending on how much power is actually delivered as thrust, and that also depends on how big the OB is in the first place, but it's interesting at least that the prop thrust is in that neighborhood.

Hydraulic trim, of course, has to support that force (greatly multiplied at the cylinder rod, and depending on geometry) when trimming the OB off the tilt stops. Prop force is acting on an approximately 20 in. lever arm, so sitting on the cover with a much smaller lever arm to the transom or hinge pin (like 12-15 in.) won't put anywhere near the forces on the transom or tilt mechanism or the surrounding structure as operating at power will, at least for a 50 hp or larger engine.

None of that takes into account dynamic effects, like pounding over the waves, of course. That only makes peak loading higher than steady-state.

Just thought it was interesting. :D
vizwhiz
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Re: Boarding the 26M using the motor

Post by vizwhiz »

Ixneigh wrote:Both models of power sailor need refinement for getting on and off especially with something bulky like a dive tank.
SKIPPER2C wrote:Maybe extend the hull with fiberglass ,with the dive platform as support and move the rudders to the end.
Has anyone called Armstrong to see if they have a solution for the X/M? I posted their website a few posts back. I have an S boat, so a little different for me, but I might call them just because I'm so curious now...
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SKIPPER2C
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Sailboat: MacGregor 26M
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Re: Boarding the 26M using the motor

Post by SKIPPER2C »

SKIPPER2C wrote:Maybe extend the hull with fiberglass ,with the dive platform as support and move the rudders to the end.
Watt if. Use the space under the dive platform for the fuel tanks when extending the hull with fiberglass and maybe support it underneath with a stainless plate to strengthen it and protect it.
Think of all the space with the fuel tanks out and the covers off. :?: :P :P :!: :!:

Ixneigh will foam core be strong. :?:

Renier
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Ixneigh
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Re: Boarding the 26M using the motor

Post by Ixneigh »

tkanzler wrote:FWIW, I did a napkin calc on the force it takes to push a boat (any boat) 15 mph with 40 hp converted to thrust, which works out to around 1000 lb of prop thrust. I assumed 10 hp (of a 50 hp OB) is lost in friction. Could be more, could be less, depending on how much power is actually delivered as thrust, and that also depends on how big the OB is in the first place, but it's interesting at least that the prop thrust is in that neighborhood.

Hydraulic trim, of course, has to support that force (greatly multiplied at the cylinder rod, and depending on geometry) when trimming the OB off the tilt stops. Prop force is acting on an approximately 20 in. lever arm, so sitting on the cover with a much smaller lever arm to the transom or hinge pin (like 12-15 in.) won't put anywhere near the forces on the transom or tilt mechanism or the surrounding structure as operating at power will, at least for a 50 hp or larger engine.

None of that takes into account dynamic effects, like pounding over the waves, of course. That only makes peak loading higher than steady-state.

Just thought it was interesting. :D
Thanks! There's the info I was looking for. Actual mathological proof 8)
vizwhiz
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Re: Boarding the 26M using the motor

Post by vizwhiz »

Would anyone be willing to grab a couple of dimensions for me from the transom of their M? I need four dimensions, please...
(1) the dimension across the top of the transom (width at rubrail)
(2) the dimension across the bottom of the transom (width at chine/corner)
(3) the dimension (height) from rubrail down to point of vee-bottom (vertical centerline)
(4) the dimension (height) 15" to one side of that vertical centerline

Thanks! Will tell you why later...
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