When I was in that business we fabricated plates to spread the load over
the entire quadrant as opposed to one attachment point.
Joe
Coquina
On 3/4/2019 8:19 AM, Robert Boyer via CnC-List wrote:
I’ve had my autopilot for probably 20+ years with the Type 1 linear
actuator directly attached to the quadrant with no issues. The
quadrant attachment is reinforced with aluminum plates. We live
aboard and cruise up and down the ICW and to/from the Bahamas. I
think your worries are unfounded.
Bob
Bob Boyer
s/v Rainy Days
C&C Landfall 38 (Hull # 230)
(Presently in Charleston SC for the winter)
blog: dainyrays.blogspot.com <http://dainyrays.blogspot.com>
email: [email protected] <mailto:[email protected]>
On Mar 3, 2019, at 10:40 PM, Patrick Davin via CnC-List
<[email protected] <mailto:[email protected]>> wrote:
I know there was a thread about below-decks autopilots on the
Landfall 38 where discussion ended up on "bolt it to the radial
drive, reinforcing the attachment point." (
http://cnc-list.com/pipermail/cnc-list_cnc-list.com/2018-May/200838.html
)
I'm researching this now, with interest in installing a Raymarine
EV-200 with type 1 mechanical linear drive, and I think it *might* be
possible to do without bolting to the radial drive. Does anyone know
if any LF38 has successfully done this?
I've already read dreuge's post -
http://svjohannarose.blogspot.com/2016/12/below-deck-autopilot.html -
which is excellent. But he went a different route than I want to go,
so it would be helpful to see other photos and installation ideas.
The reason I want to avoid bolting to the radial drive is that Edson
has repeatedly advised against it, calling it a "likely catastrophic
failure" and saying the cast aluminum fixture is not designed for
those kind of torsional forces, it's designed for pulling forces (via
the cables). A Type 1 ram has 650 lbs peak thrust and a type 2 has
1050 lbs. Additionally I have found one account of someone who had
their Edson radial explode (with autopilot mounted to it) - it took
15 years before this happened, but still not a risk that's worth it
in my mind.
The ideas I'm considering for doing this without mounting to the
radial are:
A) custom tiller arm, with a 90 degree bend to clear the radial drive
rim. It would clamp to the rudder shaft in the 1.9" of available
space (1.5" of that is within the bottom concave part of the radial
drive). Note I have no diesel tank under the steering, which makes
this easier. I don't have a design for this idea though.
B) Jefa 270 degree quadrant with integrated tiller arm.
https://www.jefa.com/steering/products/cable/quadrants/quadrants.htm
I'm talking to Jefa (part of PYI now) this week. The quadrant with
welded on tiller arm has less overall height than an Edson radial
drive, so it would fit. But I'm not sure about positioning of the
linear drive unit - it's 27.5" long and the LF38 stern is quite narrow.
Sorry for the long post. The motivation for a below-decks autopilot
is that the wheel pilot is not strong enough for significant wave
state (it's only rated for 16.5k lbs displacement, and the LF38 is
more like 19-20k when loaded for cruising).
-Patrick
1984 C&C LF38
_______________________________________________
Thanks everyone for supporting this list with your contributions.
Each and every one is greatly appreciated. If you want to support
the list - use PayPal to send contribution --
https://www.paypal.me/stumurray
_______________________________________________
Thanks everyone for supporting this list with your contributions. Each and
every one is greatly appreciated. If you want to support the list - use PayPal
to send contribution -- https://www.paypal.me/stumurray
_______________________________________________
Thanks everyone for supporting this list with your contributions. Each and
every one is greatly appreciated. If you want to support the list - use PayPal
to send contribution -- https://www.paypal.me/stumurray
