Tuesday, February 7, 2017

Valkyr’s Hard Dodger

Scott aboard s/v Valkyr needed more solar power to run his A/C (he is in Florida).  And shade is also a very nice thing...  So he took on the project of making a hard dodger to support all those new solar panels.  This is not strictly a small boat project, but shows some excellent construction techniques.  Enjoy!
So I thought I had posted pictures of Valkyr’s hard dodger long ago but it seems that I didn’t. These are not the best formatted pictures but should help to give an idea of what I did.

aft starboard view boat and dodger
Starboard view of whole dodger frame

dodger aft view handrail and boom protector mounts
We had 1/4 inch aluminum plates welded into frame to bolt the top rails onto. In finished dodger this is what actually holds it to dodger. There are 6 of them.

dodger aft view 1
Aft partial view of dodger frame

Drilling coring filling mount holes 7
We drilled the holes to mount frame to boat and then filled with epoxy and drilled again to make sure we would never have an issue with water penetration into the core.

deck mount and backing plates for under the deck
This is picture of the above deck mount and two of the backing plates for under the deck. As you can see the deck mount has a pivoting base. The reason we went with this is that once mounted we could unbolt the entire dodger with four bolts, and have no risk of water ingress while it is off the boat. also 4 bolts vs 16 bolts is a lot quicker and easier.

portside aft handrail and boom protector mounting plate underside
Underside of one of backing plates for top rails.

aft port side view of whole dodger
aft portside view of entire dodger frame

aft starboard view down dodger
starboard view down top of frame. You can see the next attachment point at the center of the handrail and then forward attachment point. Dodger has 3 rails, hand rails on either side that are full length of dodger and attached with 12 1/4 inch stainless bolts. I’m almost 200 lbs and can yank on a rail as hard as I can and it barely shivers the dodger. More rocks the boat the the dodger. The third rail is what you can see in the left foreground of the picture and is simply to keep the boom from hitting the dodger if it falls and for tieing it down if you need to.

visibility sitting at helm looking under dodger
We spent a lot of time making drawings and sitting on the boat taking measurements to get the height of the dodger correct. This is the view sitting at the helm. You have clear unobstructed view under and if you stand up you can see over it. We also did a lot of different version of the side supports to finally end up with the graceful design we got. The curves added strength and elegance yet still left us with a lot of unobstructed view forward under the dodger. The top of the dodger has the same camber as the deck under it.

dodger pad mounting 7
dodger bolted down with sealant.

dodger pad mounting 1
sealant to keep water from running down the bolt.

dodger pad mounting 6
again sealant to keep water from running down bolt. All epoxy filled holes through deck were counter sunk to allow the built up sealant around bolt here to fill and compress in the holes.

dodger pad mounting 8
It took several go around over a few days to fully tighten down. The sealant we used was pretty thick and it would gradually ooze out as it sat after being tightened. After a couple go arounds it was all good and hasn’t leaked in the 4 years since it was installed.

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Temp attachment of forward port side handrail on dodger.

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temp attachment on starboard

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port side view of dodger frame

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Middle starboard side attachment for handrail.

Waterproof junction box
This is a bit out of order but has to do with dodger. This is the central junction for all the solar panels on the dodger near the starboard aft leg of the dodger that the main wires from it run below to the charge controller. We used a water proof document case that we modified into a junction box. notice all wires into have a drip loop. All exposed wire and buss bars are coated in di-electric grease. 4 years later it still looks like new. No corrosion.

Wires from solar panels penetrating dodger top
You can see the deck penetrations where the wires from the solar panels penetrate the dodger. It was a lot of work drilling and then filling all the holes with epoxy and then drilling again. We actually glued the wires to the underside of the dodger in neat runs to lead to the junction box. It has also worked well.

solar panels1
Solar panels on dodger roof. We used a adhesive sealant to attach them to roof. It has held really good. Forget what it is called, something kevlar 400? from PPG.

solar panels2
another view of solar panels. Each one of the panels is 25 watts. They are a thin flexible panel that it is safe to walk on. There are

junction box closed
junction box closed

wire runs to junction box
roof penetration for solar panel wiring and runs glued to roof as they go to junction box. I used quick set gel super glue to do the gluing. Run a line of glue and press wire into it for a few inches and hold for 15 or 20 seconds and then repeat. It took a while to do it all but in the end it was very neat and held good. when I painted it is hardly noticeable under there. Sadly I should have sanded before glueing the wiring in. Not that it was an issue with the wiring but some of the paint flaked off on the under side.

underneath of dodger
another view under dodger. If you notice the chips in the white paint on the aft upper edge of the dodger, That edge takes a beating sometimes an has to be touched up on a regular ( annual basis )

butyl mastic used to seal under the hand rail pads.
Hand rails being attached to the top of dodger once roof is installed.

Hand rails installed
Picture with 12 panels attached. For some reason I think I added a 12th panel behind the aft most two panels for a total of 275 watts on the dodger. There is another 190 watts in one big panel on the dingy davits also for a total of 465 watts on the boat. We had power hooked up at the dock when we lived on the boat to run the AC. Since then though the boat has been powered by the installed solar. We turned off the dock power to save money and never noticed the difference.

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Kaylin helping paint!!

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Zsanic in the galley and kaylin hanging out under dodger.

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forgot to mention. If you look in the lower left corner of the dodger you will notice a drain. We custom made drains in all 4 corners of the dodger with 1/2 inch hose leading down on deck from it. No matter what angle of heel rain will drain off and if we wanted we could lead it to the tanks.

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Good view of the aft rail that protects solar panels and dodger top from boom if it falls.

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