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I’m working along on getting my Hydrovane installed and I’m pretty close to
the point of actually mounting it, but I’m having some second thoughts about
the strength of the stern to bare such loads with just the two mounting
points. The area of the mounting brackets is approximately 36 Sq. Inches
each and I canwill make the backing plates out of 1/4″ starboard even
larger than that.Question: Is it also neccessary to reinforce an even larger area of the
stern say by laying up 2 pieces of 1/4″ marine grade plywood with epoxy. I
say 2 pieces instead of one 1/2″ piece becasue there is some curve back
there and I think it would be easier that way.If I did that, I thought about initially laying in some copper mesh first
and then the plywood to add to the ground plane for my SSB Antenna.I’m curious what you all think about the stern as well.
Thanks,
-p—
s/v Deep Playa | Pearson 424 Hull #152 | http://www.DeepPlaya.com | @DeepPlaya
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Thanks Dawn and Patrick! -
Hi Pat,
Starboard is NOT a backing material – it flexes and compresses. Use
aluminum, stainless steel, or 1/2″ plywood with epoxy encapsulation. The
transom is strong enough for what you want to do. Make your backing plates
approximately twice the size of the fittings, and you should be good to go.Bob
On Thu, Jun 9, 2011 at 8:06 PM, Patrick “Peaboy” Walters <
> wrote:I’m working along on getting my Hydrovane installed and I’m pretty close to
the point of actually mounting it, but I’m having some second thoughts
about
the strength of the stern to bare such loads with just the two mounting
points. The area of the mounting brackets is approximately 36 Sq. Inches
each and I canwill make the backing plates out of 1/4″ starboard even
larger than that.Question: Is it also neccessary to reinforce an even larger area of the
stern say by laying up 2 pieces of 1/4″ marine grade plywood with epoxy. I
say 2 pieces instead of one 1/2″ piece becasue there is some curve back
there and I think it would be easier that way.If I did that, I thought about initially laying in some copper mesh first
and then the plywood to add to the ground plane for my SSB Antenna.I’m curious what you all think about the stern as well.
Thanks,
-p—
s/v Deep Playa | Pearson 424 Hull #152 | http://www.DeepPlaya.com | @DeepPlaya
_______________________________________________
maillist mailing listhttps://pearson424.org/mailman/listinfo/maillist_pearson424.org
—
Bob Fine
s/v Pelican
Pearson 424 Hull #8
http://thesailinglife.blogspot.com
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Patrick,
I’m not sure Bob is aware the Hydrovane is an auxilary rudder vane, not a
servo (like a Monitor). Essentially you are handing a rudder off the
transom. I think it would require significant beefing up of the transom for
that load. Then again I’m not an engineer so I don’t know how much beefing
it would require. The only thing I know is the previous owner mounted a
boarding ladder on the transom with plywood backing plates and my 250 Lbs
managed to produce hairline cracks in the transom.Regards,
John Stevenson
http://www.svsarah.comOn Thu, Jun 9, 2011 at 8:18 PM, Robert Fine wrote:
Hi Pat,
Starboard is NOT a backing material – it flexes and compresses. Use
aluminum, stainless steel, or 1/2″ plywood with epoxy encapsulation. The
transom is strong enough for what you want to do. Make your backing plates
approximately twice the size of the fittings, and you should be good to go.Bob
On Thu, Jun 9, 2011 at 8:06 PM, Patrick “Peaboy” Walters <
> wrote:I’m working along on getting my Hydrovane installed and I’m pretty close
to
the point of actually mounting it, but I’m having some second thoughts
about
the strength of the stern to bare such loads with just the two mounting
points. The area of the mounting brackets is approximately 36 Sq. Inches
each and I canwill make the backing plates out of 1/4″ starboard even
larger than that.Question: Is it also neccessary to reinforce an even larger area of the
stern say by laying up 2 pieces of 1/4″ marine grade plywood with epoxy.I
say 2 pieces instead of one 1/2″ piece becasue there is some curve back
there and I think it would be easier that way.If I did that, I thought about initially laying in some copper mesh first
and then the plywood to add to the ground plane for my SSB Antenna.I’m curious what you all think about the stern as well.
Thanks,
-p—
s/v Deep Playa | Pearson 424 Hull #152 | http://www.DeepPlaya.com | @DeepPlaya
_______________________________________________
maillist mailing listhttps://pearson424.org/mailman/listinfo/maillist_pearson424.org
—
Bob Fine
s/v Pelican
Pearson 424 Hull #8
http://thesailinglife.blogspot.com
_______________________________________________
maillist mailing listhttps://pearson424.org/mailman/listinfo/maillist_pearson424.org
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Pat,
I mounted a large external rudder on my transom when I installed the
Auto-Helm windvane. To beef up the transom, I made up large 1/4″
aluminum backing plates (photos attached). I believe you’d damage the
transom if you don’t do something similar. (Note the necessity to bend
the backing plates a little to match the camber of the transom. If you
get them close, they’ll finalize their shape when they’re snugged down
with the thru-bolts.)The installation has proven sound so far over a few thousand miles of
offshore sailing.Tor
Silverheels, P-424 #17
http://www.silverheels.us
Quote:
Original Message
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Pat,
(This time with the photos!)
I mounted a large external rudder on my transom when I installed the
Auto-Helm windvane. To beef up the transom, I made up large 1/4″
aluminum backing plates (photos attached). I believe you’d damage the
transom if you don’t do something similar. (Note the necessity to bend
the backing plates a little to match the camber of the transom. If you
get them close, they’ll finalize their shape when they’re snugged down
with the thru-bolts.)The installation has proven sound so far over a few thousand miles of
offshore sailing.Tor
Silverheels, P-424 #17
http://www.silverheels.us
Quote:
Original Message
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that’s about what i was thinking… but where do you store that big press on Silver Heels. 😉
Sent from my iPhone
On Jun 11, 2011, at 4:52, “Silverheels” wrote:
Pat,
(This time with the photos!)
I mounted a large external rudder on my transom when I installed the
Auto-Helm windvane. To beef up the transom, I made up large 1/4″
aluminum backing plates (photos attached). I believe you’d damage the
transom if you don’t do something similar. (Note the necessity to bend
the backing plates a little to match the camber of the transom. If you
get them close, they’ll finalize their shape when they’re snugged down
with the thru-bolts.)The installation has proven sound so far over a few thousand miles of
offshore sailing.Tor
Silverheels, P-424 #17
http://www.silverheels.us
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Thanks Dawn and Patrick! -
It’s an inflatable press. Stores in a shoebox.
Actually, on another occasion (before I discovered that beautiful press
in the boat yard) I bent a large plate of that same 1/4″ aluminum by
laying it on the ground supported by 2×4’s along either edge, and
running over it with my car. Two passes bent the plate just enough to
match for foredeck’s camber perfectly!
Original Message
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I installed a Sail-O-Mat on Easy Reach. After bolting on the single bracket that held the unit on the transon, I noticed considerable oil-canning. I then added to long aluminum battens, 1/8 thick by 1 1/2 inches wide by 3 feet or so long and rebolted the bracket through them. Since I have long since sold her to Alan Tershko, I don’t rember what else I did, but I seem to remember there were other bolts already in the transom that I used to stabilize the lower ends of the battens. Because I used 1/8 stock, bending to the cuirve of the transom was easy. The rig held up from Key West to Belize, Roatan, and back to Key West. I found the wind driven device almost useless in the lakes and, of course, the Erie Canal. The best use was in the trade wind zones south of Isla Mujeres.
Â
Norris Larson— On Sat, 6/11/11, Silverheels wrote:
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Thanks everyone for the suggestions, very helpful!
Here’s what I’m doing….
My external platesbrackets are approximately 9″4″ (they’re not really
rectangular). Which are sitting on starboard pads. The top bracket is on a
1/2″ pad and has very little shapingtaper to match the hullalign the
windvane. The bottom bracket has an 1″ to 1/2″ starboard wedge that is
shaped to properly align the brack and thus the windvane. That took a day to
sand by hand!On the inside, I’m using 13″x8″x1/2″ Marine Grade Plywood that I sanded to
match the interior hull shape. Dawn then sealed them in epoxy. On top of
that will be 316 SS backing plates that are 6″x10″x1/4″ and SS fender
washers & Nylocks.I think it will be pretty beefy, if I notice any issues, I’m going to glass
in a full sheet of 1/2″ marine grade plywood or coosa board.-p
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s/v Deep Playa | Pearson 424 Hull #152 | http://www.DeepPlaya.com | @DeepPlayaOn Mon, Jun 20, 2011 at 12:17 PM, norris larson wrote:
Quote:I installed a Sail-O-Mat on Easy Reach. After bolting on the single bracket
that held the unit on the transon, I noticed considerable oil-canning. I
then added to long aluminum battens, 1/8 thick by 1 1/2 inches wide by 3
feet or so long and rebolted the bracket through them. Since I have long
since sold her to Alan Tershko, I don’t rember what else I did, but I seem
to remember there were other bolts already in the transom that I used to
stabilize the lower ends of the battens. Because I used 1/8 stock, bending
to the cuirve of the transom was easy. The rig held up from Key West to
Belize, Roatan, and back to Key West. I found the wind driven device almost
useless in the lakes and, of course, the Erie Canal. The best use was in the
trade wind zones south of Isla Mujeres.Norris Larson
— On Sat, 6/11/11, Silverheels wrote:
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Thanks Dawn and Patrick!
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