ex Finish navy SR6 build - Page 2

Gynner · 30 October 2016, 04:39

Given that this is a PVC it will disintegrate over time b/c of UV.
Actual rubber paint may be better, but has a hard time to stick.
How about just regular sandmix / anti skip into the paint?

Gynner · 30 October 2016, 04:52

After looking at the images again I realize that you bought an SR6 that was already converted, the gas tank already placed in the position of the ballast tank. How many liters/gallons capacity?

And what year is your rib?

As for an outboard - I had a 200 2-stroke Yamaha on it and the beast would fly - even with 10+ people on board. I repowered this year with a heavier 4-stroke - a 130 Honda, and I have to say I am sold on the 4 strokes. They are very heavy though and this requires to put some ballast in the front. 550 lbs - or 250 kg is a chunk more than the 400 lbs Yamaha. Pushes the scuppers slightly under the waterline.

Stresspill · 30 October 2016, 10:36

This is 1991 SR6. The fuel tank has been put in at the factory and I think it's about 200 litres / 53 gallons. I didn't quite get what you meant by PVC? the anti-slip paint would be polyurethane based. Same as the deck surface now.

Factory specs with two 90hp 2-strokes would weight about 118kg each dry. And it would be almost exactly the same as one 225hp optimax. So I should be okay weight wise. Power is a bit over the top. But the second hand marked here in Finland is really limited on bigger engines. There's plenty of 20-50hp engines available. And that 225 opti that I'm looking at could be a bargain from the auction. We will see.

Gynner · 30 October 2016, 13:39

Interesting. Mine is a 1991 as well. And definitely only has a ballast tank. So my guess is that yours has been converted a while ago. Which makes more sense than the ballast tank. Maybe it was a special edition? Your console still has the cutout in the front for the fuel tanks to slide in

As for the pvc - that is what the spec sheet of the rubber mat link says. It does not suggest outdoor use but perhaps has some UV protection in the bonding agent.
There is a product called Turf Coat which is actual rubber paint which is made for outdoors such as playgrounds. Can find a link if needed.

The 225 would be sweet. Especially with a full tank and people and equipment. My 130 pushes the boat at 30 mph (45 km/h) with a 16 pitch prop. Yet have to attach a tach to find out rpms and likely change prop to a 19. The 2.6 L V6 200 Yamaha that I had on her a while ago were consuming about 10 to 12 US gallons / 37 to 44 liters per hour at 3000 rpms and a 25 mph speed. With 2 person load. Plus the oil.
The 4 cycle is a lot more quiet and burns about ½. But I still somehow miss the raw screaming power of the 200.

If you put a 225 on it you may want to have a steel transom brace. That too was original equipment. Connects the transom with the deck. Is about 40 cm long on the diagonal side. Can send a pic.

Stresspill · 30 October 2016, 14:24

Quote:

Originally Posted by Gynner

If you put a 225 on it you may want to have a steel transom brace. That too was original equipment. Connects the transom with the deck. Is about 40 cm long on the diagonal side. Can send a pic.

There was 3 braces on the transom on mine but I ditched the two that had been made by the Finnish coast guard or the naval forces. I think that the massive alu plate and just one brace is enough. The two additional braces were probably installed when the deck started flexing from the soaked plywood. The two batteries were installed inside the lower compartment on the console. Those look like original installations also, with orange powder coated holders for the batteries. So I think that this was some special order for the coast guard.

Gynner · 30 October 2016, 15:05

Yes, I'd keep the center one. that is steel and original.

Will your rib live on a mooring or dock or be trailered?

Stresspill · 30 October 2016, 15:50

Mostly on a dock but she's got a trailer too.

Stresspill · 12 November 2016, 18:12

Found this picture from the earlier days of my baby

Gynner · 13 November 2016, 05:08

Yupp.
Boat is also mentioned in Sebastian Junger's book "The Perfect Storm" as the rescue boat that gets launched from the US Coast Guard Cutter Tamaroa to help people on that sailboat.

Stresspill · 13 November 2016, 09:32

Luckily I have proof. That is a Finnish Coast Guard vessel "Kiisla I" Build at 1956. It served at the Gulf of Botnia before it was sold to a private owner somewhere around 2001. Unfortunately it sunk soon after that.

tcruud · 15 November 2016, 18:19

Very good work and a good read. Excelent documentation.
Looking forward to see the final result.

Stresspill · 15 November 2016, 19:03

Quote:

Originally Posted by tcruud

Very good work and a good read. Excelent documentation.
Looking forward to see the final result.

Thanks, me too! This project is now hibernating for the winter.

m3mm0s rib · 18 November 2016, 06:43

my friend very good job, but personal opinion on vessels prohibited the wood despite only at transom

Stresspill · 18 November 2016, 10:40

Quote:

Originally Posted by m3mm0s rib

my friend very good job, but personal opinion on vessels prohibited the wood despite only at transom

Hi Memmos!
In my books wood is totally fine and surpasses most materials if weight is not considered. And in this case I wanted to get this boat fixed and did not want to spend a fortune on more exotic core materials. I think that if the boat had already lasted 25 years with poor decisions on fixings etc. It would last another 25 years with the same construction choices on materials. And this time all the inserts are bedded in epoxy. If I would make a totally new boat I would opt for something else than wood.

Nice build on your youtube link!

m3mm0s rib · 18 November 2016, 16:53

davkt · 05 December 2016, 20:55

Fantastic work on restoring this.

Stresspill · 06 May 2017, 22:37

It seems that dropbox sharing has changed and all the linked images are now missing. But here is a link to a dropbox folder that has the images.

https://www.dropbox.com/sh/3ku6hhbky...eWcFXsiva?dl=0

Is there no edit function so one could fix earlier posts at all?

Stresspill · 25 June 2017, 18:25

Just by luck stumbled upon these Buster LE extra rear seats / storage boxes. Exact fit to SR6. Planning to build a small platform to lift them up a bit and maxing them removable if needed. Maybe the rigging hoses will then have room to travel under them. Or I just guide them along the side of the boat. Dunno yet. Backrest will be attached to the A-frame. Also might push the boxes a bit backwards and cut holes to sides to give access to valves.

As you see this SR6 is still a project going on (slowly). Haven't been able to find a motor yet. Used but modern engines are a rarity in Finland it seems.

Still to come
Anchor box / seat to bow. I will probably make it from GRP.

Stresspill · 28 June 2017, 09:21

Update on the engine. It seems that this will be powered by a Yamaha F150! Was not cheap, but it's a 2011 engine with just over 500 hours on the meter.

Stresspill · 28 June 2017, 10:09

As the engine choice went to this premium route. I'm also thinking that the floor should be up to par. So I'm leaning towards the Treadmaster deck. Difficult to decide between black and grey and should I glue it with sikaflex or opt for the Treadmaster PSA - Pressure sensitive adhesive.