[Alberg30] backing plate

Tue Mar 25 10:50:10 PST 2003

Thank you for the excellent detailed description of the system you are
constructing. I have one question - how far does the oak platform
project beyond the stemhead fitting? 

>>> jay at saildriver.com 03/24/03 05:33PM >>>

Dave,

I like to anchor out, and I normally do it a lot. Although Revolution
has been out of the water for the last 2 years, she should be afloat
this Spring.

One of the things that I discovered about anchoring, was the
disadvantage of not having a bow-mounted anchor roller. I looked at
other designs, and talked to a lot of people, but couldn't find a plan
that I liked. The front of a late model A30 is a bit "busy". Finally, I
came up with the one I am currently building.

It has been time-consuming and expensive, but I am hoping it will work
well. I will give you a general description, and you can let me know if
you want further detail.

The goal was to have a bow platform carrying an anchor roller. The
roller should handle several anchor types, including Fortress, Delta,
and Spade, and hold them securely. It must be usable without interfering
with my roller furling drum. It must be strong enough to hold the forces
generated in a 60 knot blow. It must not detract from the looks of the
A30.

I determined that I wanted to use a Windline URM-1 as the anchor
roller, both for it's strength and for it's versatility in handling
different anchors.

The platform to hold the anchor roller is made of white oak which is
finished with multiple coats of Sikkens Cetol. The dimensions are: 11"
wide by 24" long by 1½" thick. There is a slot in the middle of the
platform to hold Revolution's stem fitting.

The stainless anchor roller is bolted to the right of the slot, and to
the far right side of the oak platform. The furling drum overhangs half
the roller's width. This means that maneuvering the anchor shaft in
and out of the roller shouldn't be difficult. Also, much of the
strength of the steel roller is imparted to the wooden platform it is
bolted to. 

Oak shims were cut (the shape is strange) to enable the platform to sit
fair on the lip of the cast stem fitting. When cutting these shims, as
well as the original wooden platform, I first used rigid pink insulating
foam board, (which is 1 1/2" thick., and is easy to work with), to make
dummies. 

>From the back end of the anchor roller to the back end of the wooden
platform, I have covered the top of the platform with 1/8" stainless
plate, which then continues aft and rolls over the back edge of the
anchor platform & goes down to the deck. This will protect the wood from
the effects of the anchor rode dragging on top of it.

To let me pull the anchor up from any place on the foredeck (and avoid
interference between the rode and the furling drum), I have put an
inverted roller with a removable shaft on the steel plate behind the
anchor roller. This keeps the rode horizontal while it is passing under
the furling drum.

Under the back end of the wooden platform is a white oak block which is
5" wide, 2.5" fore & aft, and 4" high. The affair is secured to the boat
by ½" by 7" stainless bolts which go through the 1/8" stainless plate,
the 1.5" platform, the 4" block, and the ½" deck. There is a 1/8"
stainless backing plate (6.5" x 8") epoxied under the deck. 

An additional stainless securing strap holds the front of the platform
down. It is 1" by 1/8" by 14", and runs from one of the front horizontal
stem screws under the front of the platform, and up to the platform.

If you have any further questions about this installation, let me know.
Keep in mind that the installation is not yet complete, so I can't
evaluate it's performance or it's success in meeting my goals yet.

Jay Davenport

 Dave Terrell <DTERRELL at message.nmc.edu> wrote:Could you give some
descriptoin of your new bow platform and tell
something about how you made it. I will be dong the same thing soon
and
would appreciate some input. Thanks. Sorry I can not help on your
specific question except to say that it sounds like a good question.

>>> jay at saildriver.com 03/19/03 08:02PM >>>

I will be installing a 6" by 8" stainless backing plate under the
front
deck to anchor the new bow platform bolted through it. Because the
under
side of the deck is not smooth or perfectly flat, I want to mix up an
epoxy paste to go between the plate and the underside of the deck. Can
anyone suggest the best brand and type of paste for this kind of
compressive situation?

Jay Davenport

Revolution, A30 #526

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