Jerry knows rudders. Read this - http://www.sagemarine.com/SCA_articles/SCA_pdf/smalltalk_55.pdf (The above opens a PDF document) :: Dave Scobie :: M17 #375 SWEET PEA - m17-375.com On Tue, Jun 12, 2018, 12:45 PM John Schinnerer <john@eco-living.net> wrote:
Yeah, I am wanting to put the counterbalanced one back on sometime this season and compare performance. I only used it the first fall I had the boat (it was the only one I had at first). I couldn't even put it on at the ramp dock because the lake was down and not deep enough at end of dock.
But it was quite responsive. Then it was next season and I started using the slide-up, so never have done a direct comparison. The slide up is certainly OK also...I'm just curious if I can feel a difference.
The slide up is actually swept back a bit below water line. It could be vertical. There could even be some counterbalance below the slide-up depth. Rudder design...a whole 'nother can 'o worms...
cheers, John S.
On 06/12/2018 11:59 AM, Dave Scobie wrote:
The partially balanced rudder that John describes are great for helping boat performance ... but not good if you need to raise the rudder.
:: Dave Scobie :: M17 #375 SWEET PEA - m17-375.com
On Tue, Jun 12, 2018, 11:02 AM John Schinnerer <john@eco-living.net> wrote:
The solid slide-up rudders, slid up, are actually still a bit deeper than the M17 keel with board up. Mine is at least.
I have two rudders at this point - a presumably original, two-pintle, counterbalanced one-piece that does not slide up (#38 1974 M17, must have been before the slide-up was standard).
And, a later model slide-up that I bought used from Rick (Davies) here on the list. I don't know if it was from Jerry era, from JO Woodworks, or from Bob era, never thought to ask. I am just completing a refinishing of that one. I thought about taking a few inches off the bottom, but didn't want to risk losing effectiveness, especially when it's slid up.
My original fixed and the slide-up are the same depth when the slider is down.
All I know about the Rudder Craft ones is that the M17 in the first R2AK had one, and it broke. Twice, I think. Their "bluewater" (heavy duty) version might have been a response to that?
cheers, John S.
On 06/12/2018 07:19 AM, Dave Scobie wrote:
The solid mahogany one piece rudders that Jerry made are very good and not at all prone to failure. In the 'up' position they are higher than the keel (centerboard up).
If you believe the rudder shape isn't right look online for a NACA12 foil and make a template to confirm the shape of your boat's. Very easy to refine the shape on a nice piece of wood.
:: Dave Scobie :: M17 #375 SWEET PEA - m17-375.com
On Tue, Jun 12, 2018, 7:14 AM Kevin Sandwick <ksandwick@hotmail.com> wrote:
Just curious, Is anybody using the Rudder Craft High Performance Kick Up Rudder on an M-17 ?
Not an inexpensive modification. Any thoughts?
Thanks
Kevin
-- John Schinnerer - M.A., Whole Systems Design -------------------------------------------- - Eco-Living - Whole Systems Design Services People - Place - Learning - Integration john@eco-living.net - 510.982.1334 http://eco-living.net http://sociocracyconsulting.com
-- John Schinnerer - M.A., Whole Systems Design -------------------------------------------- - Eco-Living - Whole Systems Design Services People - Place - Learning - Integration john@eco-living.net - 510.982.1334 http://eco-living.net http://sociocracyconsulting.com