Rudders up when motoring

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beechkingd
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Rudders up when motoring

Post by beechkingd » Sun Aug 11, 2019 8:26 pm

The owners manual says that you should have the rudders up if going over 5 MPH. I've tried and have a hard time maintaining a heading, it maybe because I have a 30 hp engine but I'm not sure.

DaveC426913
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Re: Rudders up when motoring

Post by DaveC426913 » Sun Aug 11, 2019 10:46 pm

Yes. Macs are like that. It's not you.

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Signaleer
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Re: Rudders up when motoring

Post by Signaleer » Mon Aug 12, 2019 12:41 am

You'll snap your rudders, or risk it, and/or cause a dangerous situation to your crew if you keep the rudders down over those speeds.

30 hp is nothing.

Driving takes time and experience - turn it much much much less than you think you need to. Wait. Adjust more if needed.

kurz
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Re: Rudders up when motoring

Post by kurz » Mon Aug 12, 2019 3:00 am

I'm shure you can use your rudders down at speed up the mac will go to planning. And this is till 6kn. You also sail at these speeds.

Above that that mac goes towards planning. And then the rudders must go up. But with 30HP this will not happen I guess.

What is your speed you want to motor?

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Tomfoolery
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Re: Rudders up when motoring

Post by Tomfoolery » Mon Aug 12, 2019 3:55 pm

I keep only one of them down when motoring without the mast, but that's with ballast in and not over about 6 kts. But my :macx: doesn't seem to wander around at higher speeds, at least with the ballast vent and valve open while I'm draining ballast. At low speeds with no rudder(s), it's all over the place. :P

beechkingd
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Re: Rudders up when motoring

Post by beechkingd » Mon Aug 12, 2019 7:54 pm

With the 30hp it will do 9.5 mph with the ballast in and about 13-14 with it empty, never planes though. It just will not hold a heading at all without at least one rudder down. My thought was maybe the lower unit is smaller on the 30hp than the intended 50-60hp that is intended to be there and doesn't act as a rudder enough. I have a hard time keeping it within 10 degrees of where I'm trying to keep it pointed. It's almost like my trying to drive through a chine walk on the Hydrostream I used to have, just a lot slower. :D

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Jimmyt
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Re: Rudders up when motoring

Post by Jimmyt » Tue Aug 13, 2019 6:59 am

There is a "sweet?" Spot I've noticed where the M is like Mr Toad's wild ride. Slower and it's ok. Running on a plane is ok. It's definitely not just your boat. I've got a 60, so I either ease along or plane. You can definitely use the rudders at normal sailing speed, but not above. Some owners have bonded skegs to the hull to try and cure the problem. You might try to check w/RIS or Ixneigh.

See http://www.macgregorsailors.com/forum/v ... 72ce20b259

DaveC426913
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Re: Rudders up when motoring

Post by DaveC426913 » Tue Aug 13, 2019 10:03 am

kurz wrote:
Mon Aug 12, 2019 3:00 am
And this is till 6kn. You also sail at these speeds.
I don't have the skilz to know for sure, but I suspect there is a fundamental difference between sailing at 6 knots and motoring at 6 knots when it comes to forces involved.

i.e. just because it's OK to sail at 6 knots with the blades down doesn't mean it's OK to motor at 6 knots with the blades down.

But I have no evidence to back that intuition up.

(That being said, I still do use the blades when motoring at 6 knots - I'm just mindful that it might be risky on the hardware.)

kurz
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Re: Rudders up when motoring

Post by kurz » Wed Aug 14, 2019 6:39 am

I don't see the differens in motoring in 6kn and sailing in 6kn. I don't think motoring is heavier for the rudders.

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John Christian
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Re: Rudders up when motoring

Post by John Christian » Thu Aug 15, 2019 11:01 am

I typicaly pull the rudders as soon as I clear the no wake zone leaving the marina. Ive forgotten a few times and the boat will remind you fast.
Cant explain the physics, but under power reacts different than under sail. Have sailed comfortably at 8mph but powering at that speed she gets very squirrely.

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