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28th October 2019, 02:24 PM #1Senior Member
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Aquarama Model Build - Rudder query
I have a post thread going over at the General Woodworking forum I hope that is correct as it started life as a woodwork project.
It is a scratch built model of a early Riva Aquarama wooden speedboat about 1960 I think. I am using a set of A0 plans that are ok but limited and without any instructions.
Aquarama
I have a query that some boat builder designers maybe can help me with.
The plans have good diagrams of the positions and sizes of most of the skeleton and the general layout but there is not a lot showing of the rudders.
I have purchased a set of 45mm rudders and posts from a RC shop.
The boat has a V at the transom not deep but far from flat. The rudder posts have come through the floor so they are 90deg to the hull at that point but they are not vertical ie plumb. They lean out at about 5deg or so.
I see varying info on the net about twin rudders but nothing definitive.
Here is a pic from the net of what they look like now.
Rudder angle.jpg
My question is should they be 90deg to the floor at that point and not plumb or should they be plumb?
I would have to fill they holes and re-drill them to get them vertical but I would like to have a reason why?
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11th January 2020, 03:04 PM #2Senior Member
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I put them in at Vertical to the center of the boat.
The through holes were square through the logs but as the logs were following the bottom V shape that made the rudder post at an angle to the vertical. So I eased the holes out to get the posts to be straight up and down. I then set them permanently in epoxy resin.
Don't know what I was getting excited about they just look right now!
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11th January 2020, 10:32 PM #3GOLD MEMBER
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they should be plumb, parallel to the keelson line. the only type of boat that they would be angled generally is on a big yacht with twin rudders, as the rudder doing the work on each tack would be then vertical as the boat would be heeled to leeward of the wind. My big powerboat they are mounted plumb, and about the distance of one revolution of the prop behind the back of the prop. I think the main reason on a powerboat would that they would track properly and also if they were angled they would be very hard to get prfectly right to eliminate any yaw from uneven trim.
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