Boat Building Forum

Find advice on all aspects of building your own kayak, canoe or any lightweight boats

Re: Strip: Rudder mechanism and blade
By:JohnAbercrombie
Date: 11/25/2014, 8:28 pm
In Response To: Re: Strip: Rudder mechanism and blade (Palle Dam)

When I have determined the optimal rudder area I will have figure out what the aspect ratio should be. I have read that high aspect rudders (long and narrow) have a low drag but are more prone to stall. The opposite is the case for low aspect rudders (Short and wide): Higher drag, but also higher stall angles. What will the best compromise be for a kayak?

Palle:
Perhaps I'm not very creative, but when I was thinking about building a DIY rudder, I just copied ideas from commercial models. An image search on kayak rudders should give you some pictures which can be (roughly) scaled.

It depends on the hull shape, but I think that keeping enough rudder in the water when the boat pitches is important. A kayak rudder won't create much drag, no matter what the aspect ratio, IMO.

You are hanging the rudder off the stern of your boat (not under the hull like a surfski) ?

Messages In This Thread

Strip: Rudder mechanism and blade
Palle Dam -- 11/21/2014, 1:50 pm
Re: Strip: Rudder mechanism and blade
Nick Schade - Guillemot Kayaks -- 11/21/2014, 3:35 pm
Re: Strip: Rudder mechanism and blade
Palle Dam -- 11/22/2014, 8:23 am
Re: Strip: Rudder mechanism and blade
John Kroeze -- 11/21/2014, 3:43 pm
Re: Strip: Rudder mechanism and blade
Craig -- 11/22/2014, 1:18 am
Re: Strip: Rudder mechanism and blade
Allan -- 11/22/2014, 1:33 am
Re: Strip: Rudder mechanism and blade
Palle Dam -- 11/22/2014, 9:14 am
Re: Strip: Rudder mechanism and blade
JohnAbercrombie -- 11/22/2014, 1:40 pm
Re: Strip: Rudder mechanism and blade
Bill Hamm -- 11/23/2014, 1:44 am
Re: Strip: Rudder mechanism and blade
Palle Dam -- 11/25/2014, 7:55 pm
Re: Strip: Rudder mechanism and blade
JohnAbercrombie -- 11/25/2014, 8:22 pm
Re: Strip: Rudder mechanism and blade
Palle Dam -- 11/27/2014, 6:56 pm
Re: Strip: Rudder mechanism and blade *PIC*
JohnAbercrombie -- 11/27/2014, 7:56 pm
Re: Strip: Rudder mechanism and blade
Bill Hamm -- 11/30/2014, 12:56 am
Re: Strip: Rudder mechanism and blade
Palle Dam -- 11/30/2014, 9:11 pm
Re: Strip: Rudder mechanism and blade
JohnAbercrombie -- 11/30/2014, 11:36 pm
Re: Strip: Rudder mechanism and blade
Palle Dam -- 12/1/2014, 1:17 pm
Re: Strip: Rudder mechanism and blade
JohnAbercrombie -- 12/1/2014, 2:18 pm
Re: Strip: Rudder mechanism and blade
Bill Hamm -- 12/1/2014, 1:13 am
Re: Strip: Rudder mechanism and blade
Palle Dam -- 12/1/2014, 1:50 pm
Re: Strip: Rudder mechanism and blade *PIC*
JohnAbercrombie -- 12/1/2014, 2:27 pm
Re: Strip: Rudder mechanism and blade
Bill Hamm -- 12/2/2014, 12:41 am
Re: Strip: Rudder mechanism and blade
JohnAbercrombie -- 11/25/2014, 8:28 pm
Re: Strip: Rudder mechanism and blade
Bill Hamm -- 11/26/2014, 5:29 am
Re: Strip: Rudder mechanism and blade
scottbaxter -- 11/21/2014, 4:40 pm
Re: Strip: Rudder mechanism and blade *PIC*
Reg Lake -- 11/24/2014, 12:57 am