SV Dragonfly USA

SV Dragonfly USA Total refit of a 1971 Pearson 36

Interior salon nearly finished, super happy with the white ash Formica and PlasDECK Synthetic Teak Decking.   Cushion fo...
10/11/2024

Interior salon nearly finished, super happy with the white ash Formica and PlasDECK Synthetic Teak Decking. Cushion foam and fabric sourced from Sailrite. Stitching by Captain heavy stitch, Art is the best! Sole painted with multiple passes of Pettit EZ Poxy Spray after some fairing and sanding of chipped gelcoat and their EZ Primer Spray.

Those with a keen eye will catch that I have not bullnosed the cabinets and counters yet, that’s a winter router project, I’m not looking to crack anyone’s skull.

Those who know the Pearson 36 will note that I refitted all the cabinets in the salon. Across from the head there were a pair of lockers, left was a hanging locker, right was kind of muddle of drawers and a strange cubby space. I decided to gut that setup and instead I tabbed in a new half bulkhead aligned with the shoulder for the forward chainplates which beefed that shoulder up nicely. This would have made for a much narrower hanging locker but we never used
It anyways so I decided to lose the tall hanging locker, this allowed for a full length countertop with cabinets above and below. Now that corrodor to the forward cabin doesn’t seem as cramped and the upper/lower cabinets are more accessible storage space.

In the main salon I trimmed back the top of the cabinets (which were designed to double up as additional berths, but I’ve no interest in sleeping 7 people on this boat) to add a 70 degree angle for much more comfortable sitting position when it’s pouring outside. I then built in an additional 6” layer of storage above those cabinets so that there are now three storage cubby’s behind the cushions on each side and the cushions are 6” taller.

I’m likely going to add open shelves half way up above those cabinets.

All cabinets are insulated with 1/2”
closed cell foam, above the waterline for heat/cold, below for condensation.

If you read this far you’re likely a DIY’er yourself and I hope this post is helpful!

Pearson Yachts Pearson Sailboat Family

PlasDECK.  Very happy with it.  Great company to deal with too. PlasDECK Synthetic Teak Decking. Pearson Yachts Pearson ...
10/09/2023

PlasDECK. Very happy with it. Great company to deal with too. PlasDECK Synthetic Teak Decking. Pearson Yachts Pearson Sailboat Family

Was more than a little anxious with the final step - water purity testing - but delighted that all the work to rejuvenat...
10/15/2022

Was more than a little anxious with the final step - water purity testing - but delighted that all the work to rejuvenate Dragonfly’s musty/moldy water tanks and hoses was worth it in the end. Project started with pulling all hoses and pumps. Then the Rotozip made short work of cutting dual 8” access holes in each tank which allowed for some serious scrub/wash/rinse/repeat cycles. Filled tanks to make sure no leaks, happy that there were none but I had “floaties”. Multiple tank cleans later and I realized the “floaties” were coming from the hose at the dock. Started researching water filters. Installed access plates to make the tanks watertight and sailed for most of July with a bleach/water shock mixture sloshing about in the tanks then had them pumped out and dried. Filled with freshwater and installed PEX lines from Home Depot, Lowes, and/or Ace Hardware (the American 1/2” tubing, not the almost 1/2” European tubing) and plastic push to connect fittings from Watts. Dragonfly is electric propulsion so no heat exchanger so installed a 120v Bosch water heater. This gets the water up to temperature in a few minutes and holds it there for quite a while. I installed the Bosch using flexible braided hoses for the cold inlet and hot outlet so that the heater can be quickly removed for winter. Research led me to a Clearsource water filtration system that’s popular on RV’s so I added one as a safeguard for dodgy water coming in from a dock fill or the tanks being compromised somehow. For winter I just turn off the water pump. let the pressure off by opening a faucet, screw off the filter housings and let the filters dry out. Hope some of this is useful information for anyone considering similar project. — with SV Dragonfly USA in New Castle, New Hampshire.

Update on the Electric Yacht QT10 Sport in '71 Pearson 36 with 14" 3-Blade Classic Max-Prop set to 11" pitch.Here are th...
10/15/2022

Update on the Electric Yacht QT10 Sport in '71 Pearson 36 with 14" 3-Blade Classic Max-Prop set to 11" pitch.

Here are the numbers -

16a 52.8v (845w) 2.9kts
41a 52.4v (1148w) 3.8kts
64a 52v (3328w) 4.5kts
80a 51.8v (4144w) 5kts
96a 51.5v (4944w) 5.5kts
100a 51.4v (5140w) 5.6kts
120a 51.1v (6132w) 5.7kts
139a 50.8v (6604w) 6kts
161a 50.4 (8114.4w) 6.1kts

Hull was cleaned, testing was with a cross-wind.

Performance up to 140amp are all ahead of the original predictions from Electric Yacht, with 140amps/6Knots being where it matches up to predictions. Pushing current beyond 160amps has no measurable affect on speed and I could not achieve the predicted 6.5kts.

Feedback from Scott (owner) at Electric Yacht is to switch pitch to 10" next time the boat is out of the water, this will likely have negligible impact on speed (0.1 - 0.2 knots) but the motor should run more efficiently. I like efficiency, so I'll do this early next season and report results.

Moving out of paint shop.  Next up is bottom paint (black) and installation of restored and replacement deck hardware.
03/09/2022

Moving out of paint shop. Next up is bottom paint (black) and installation of restored and replacement deck hardware.

“New” Electric Helm.  Post 1 of 2.  Started with 1971 Edson Pedestal.  Followed Edson’s super helpful YouTube videos on ...
08/22/2021

“New” Electric Helm. Post 1 of 2. Started with 1971 Edson Pedestal. Followed Edson’s super helpful YouTube videos on how to dis-assemble / re-assemble. Removed collar with engine control levers (don’t have internal combustion engine anymore) which lowered compass nicely making room for the chartplotter above. Replaced pedestal top plate with Edson’s wider one to accommodate a wider pedestal guard, which in turn will accommodate a Scanstrut Chartplotter Pod (next post). Cleaned needle bearings with acetone, greased with Superlube. Thanks to Ken @ Edson Marine for the replacement sticker and nylon bushing for the wheel brake (original was brittle and fell apart when being removed). Amazed that 50 years later I could find replacement brake bushing and a wider top plate. Edson is amazing. Big shout out to Matt @ Powder Coating Alternatives in Greenland, NH. She looks like new.

Happy 50th Birthday Dragonfly!
08/18/2021

Happy 50th Birthday Dragonfly!

Hooked up the solar bits in my garage today.Panasonic HIT 330W PanelVictron 48|100-20 MMPT ControllerVictron Venus GX Sy...
05/28/2020

Hooked up the solar bits in my garage today.

Panasonic HIT 330W Panel
Victron 48|100-20 MMPT Controller
Victron Venus GX System Monitor

Somewhat cloudy here so hovering around 310w. Occasionally gets to 335w which is nice to see.

Should yield about 1.2kW/day during summer.
Excited to get this stuff aboard.

Meanwhile out in the meat locker, the 3GM30F makes room for the EY10S.  Big thanks to the IBH (Independent Boat Haulers)...
01/29/2020

Meanwhile out in the meat locker, the 3GM30F makes room for the EY10S. Big thanks to the IBH (Independent Boat Haulers) guys and their crane.

Electric Motor Project - The Victron Quattro 48/5000/70 Invertor/Charger.Why/How did I pick this monster? * While on sho...
01/28/2020

Electric Motor Project - The Victron Quattro 48/5000/70 Invertor/Charger.

Why/How did I pick this monster?

* While on shore power it can charge a 48v battery with up to 4kW of power. The next model up is 8kW but most common shore power receptacles are 50amp and 30amp, I'm not sure where I'd source 70amp to be honest. Anyways, if on a 50amp circuit this model would push up to 4kW into the battery (120v @ 33amp) and on a 30amp circuit it would push 3.6kW (120v @ 30amp). It can be configured with a smartphone to back off a bit if it's tripping the shore circuit. Assuming my 14.4kW bank is fully discharged (I'd rather avoid this, but with LifePO4 I can use 100% of the capacity without damaging the cells) it could theoretically be charged in 4 Hours on a 30amp circuit. Ideally of course it wouldn't be fully discharged (solar, wind, and portable generator while offshore). Which brings me to....

* While OFF shore it can still charge a 48v battery with up to 4kW of power and there are a number of portable generators that provide close to 4kW "running", there are a number of portable generators that can provide close to 2kW "running", and some of those can be hooked together to provide 4kW running. I concluded that 4kW was the high-water mark for portable generators and that's why this particular Victron stood out as being the best fit for Dragonfly. Ideally, of course, while off-shore the batteries will be getting charged by solar panels during the day at a rate that keeps up with the draw from occasional use of the motor. But the world has a irritating habit of being less than ideal. Worst case - no sun AND no wind - I could motor at 3.2Knots (900W) for 16 hours on a 14.4kW LifePO4 battery, or for about 50 nautical miles. That's a lot of motoring for a sailboat. Maybe I'm on tight schedule and it's day after day of fog/cloud. That's when I would like to be able to kick in a 2Kw or 4kW portable generator. The Quattro would happily push that power into the battery while the motor is running. Assuming no help from the wind whatsoever that 4kW would push Dragonfly about 5Knts and the 2kW would push about 3.2Knts until I ran out of fuel. Essentially a hybrid setup. As an aside the ElectricYacht motor at full "throttle" would push Dragonfly to 7Knts, but it would be drawing 9.6kW from the battery so it would be only recommended for brief periods.

* It's an inverter. 14kW is a LOT of power to be sitting on most of the time (decent sailing weather, decent sunshine) and the Quattro can turn it into 110V AC for modern conveniences like, um, an electric tea kettle. Yes, I'm Irish, and a good cup of tea is a great way to start the day. Seriously, boiling water is the biggest use of my alcohol stove. As I get a handle on what sort of renewable power I'm generating versus using most of the time I'll start to ponder what (if any) other conveniences start to make sense. Halogen cooktop? Microwave? Who knows, it's all in the future, I'll try to keep you posted.

* It's completely manageable/viewable from a smartphone.

The engine data (essentially battery data - voltage, amps, watts, remaining time) displayed on the ElectricYacht display...
01/24/2020

The engine data (essentially battery data - voltage, amps, watts, remaining time) displayed on the ElectricYacht display isn't readily accessible on a chart plotter or cellphone, so I'm planning to use a Victon BMV to accomplish this goal. Here I install and test a BMV-700 series battery monitor to see is this is feasible...

Hooked up the Victron BMV-702 to see if it can replace the ElectricYacht display at the helm, ideally by routing battery information to my chartplotter and/o...

Quick video overview of Dragonfly's ElectricYacht 10 Sport hooked up to a 300ah 48v bank of Battleborn LifePO4 batteries...
01/15/2020

Quick video overview of Dragonfly's ElectricYacht 10 Sport hooked up to a 300ah 48v bank of Battleborn LifePO4 batteries in my basement.

Hooked up the motor to a 300ah 48v bank of Battleborn LifePO4 batteries. Built staging bulkhead for the battery disconnect, throttle, and controller/display....

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