Stringer repair

bjf66

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managed to lay up two more layers on inner transom, starting to take shape
#2 layer 17oz biaxle
#3 layer 600 CSM (2oz)

Tomorrow job:
#4 layer 25 oz biaxle to come tomorrow (first time I have used 25 oz so interested to see how easy it is to lay up)
 

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bjf66

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that should give us close to 5mm thickness of inner transom, and going for similar thickness on outside of transom
 

bjf66

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layer #3 600 CSM
 

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Baylinerchuck

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Looking good. That is s lot of fiberglass. 25oz roving is really thick. Youll have to update on how much more difficult it was to work with than 17 oz.
 

bjf66

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Installed #4 layer using the 937grm (25oz) biaxial fabric tonight
I covered approx. 1200x1000mm with approx. 1.4kg (2.8 US lbs) of VE
Tonight in melb temperature 20-23 C so a little cooler than last night, so had plenty of time to work with the 25oz fabric, used roller and 2" brush to dab VE on transom, and roller to take out air bubbles
actually 25oz cloth layered up fairly easy not much different than 17oz just took a little more resin to wet out

Therefore 4 layers now on inner transom
1 layer 600CSM
1 layer of 17oz biaxial
1 layer 600CSM
1 layer of 25oz biaxial
This was laminated to the original transom skin which would of been 2mm thick, so I didn't think there was a need to tab and reinforce the floor and inner transom, unless someone thinks it would be better to add a layer of 2oz CSM/17oz biaxial to reinforce

Now finished the inside of transom, there is a few dips to fill with PB
The transom when finished will be close to 70mm (2.8" )thick
Have used approx 30kg VE so far

maybe able to get a few layers on outer transom this week, which would be good
Then not sure whether to repair stringers first, or cut out hole in transom and mount the surface drive

a couple of photos of fitting the 25oz biaxial fabric and the completed layered fabric on inner transom
 

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bjf66

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I forgot to add that all along with the transom rebuild I have been mixing catalyst @ 1.5% level which has given reasonable working time, although the other night the temps were up near 27C and it was starting to kick reasonable quickly, had the good wife holding fabric in position while I applied the VE resin
 

bjf66

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Outside of transom moving ahead
Managed to get 2 more layers on outside:
Layer #3: 600 CSM (2oz)
Layer #4" 617grm (17oz) biaxial:
so far 38 oz on outside

2 more layers to go on
#5: 600 grm (2oz) CSM
#6: 937 grm (25oz) biaxial

That will be 65oz on outside skin and 46oz on inside, encapsulating:
Lower section transom: where surface drive will be: 600grm CSM /18mm marine ply/600 CSM*2 + glue/ 18mm MP/ 600 CSM*2 + glue / 18mm MP/600 CSM
Upper section transom: 600grm CSM/18mm marine ply/600 CSM*2 + glue/ 12mm MP/ 600 CSM*2 + glue / 12mm MP/600 CSM
Joints stepped so they over lap each other
The transom will be close to 75mm (2.95")thick when finished

If the arse falls off the boat due to lack of strength, I'll turn it into submarine
 

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bjf66

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will be having a few beers tonight to celebrate the final laying up transom, apart from a little filling and sanding

46oz on front of transom (4 layers)
65oz on rear of transom (6 layers)
 

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bjf66

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New LH stringer laminated, length 730mm long
18mm MP/2oz CSM*2/12mm MP/2oz CSM*2/18mm MP, total 56mm thick
glued in and filleted at back
Need to add sandwiched 200mm overlap each side

Had to cut a little more out of the RH stringer as found a little more rot, so new stringer will be 1150mm long
 

bjf66

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forgot to add photos
 

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bjf66

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well back into the fixing one of the stringers
- cut stringer down
- ground fibreglass off the original stringer approx, 250mm long each side of stringer
- fillet around stringer
- wetted laminated stringer (55mm thick) with VE
- layed 2* 600grm (2oz) CSM 400mm x 250mm to build the older stringer up
- layed 1*layer 617 biaxle fabric over the joint 400mm x 250mm H
- layed 1*layer 600grm CSM over new/old stringer for the biscuit joint
- cut 2* 400mm x 200mm 3/8" Marine Ply, laminated 1* 600grm CSM onto the inner side of biscuit
- mixed up PB and glued the 2*3/8" MP as biscuit joint

was going off reasonable quickly

Tomorrow's job:
- fillet around the joint, and smooth up
- 1* layer of 600 grm CSM
- 1* layer of 617 Biaxle fabric
- 1* layer 600 grm CSM
- 1* layer of 937 grm Biaxle fabric
That will be close to 48 oz on stringer and then see how it looks
 

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bjf66

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sorry used 1/2" marine ply and not 3/8" for biscuit joint, on bases that I had it lying around
tidied up yesterday glued joint, layed 600 grm 1*600 grm (2oz) CSM, and 1* layer of 17oz of bi axial fabric
 

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bjf66

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laid up another 2 layers on to new stringer, carried the cloth up under floor on to inside of the outer stringers
1* 600grm CSM (2oz)
1* 937grm biaxle (25oz)
so have 48oz on the new stringer, it looks strong
ran the fabric of all 5 layers back to the new transom and tabbed in
one stringer completed, good to get that out of the way
on with #2 stringer
 

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bjf66

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HYDRAULIC STEERING OPTIONS
Started to think about steering for the Arneson drive today
measure the sealed stainless hydraulic cylinder which has a bore of 46mm ID x 200mm stroke, and a pin diameter of 19mm
phoned around to talk to some of the hydraulic experts,
Had a look at the eaton char lynn website and figured I need to be around 3.5 turns of the wheel lock to lock, which need a helm pump of 75cm3 (4.5ci), which matches with char lynn # 211-1007-002, now to find one under $500

not sure whether this is correct, however it seems good starting point
need to also order steering column approx. 3" height

Not sure what others run with hydraulic steering helms, I checked with brother in-law who runs 27' proline and he was 1.75 lock to lock
My brother runs 25' similar to proline and he runs 3.5 turns lock to lock. Both these boats are set up with 250hp yamaha's

comments please?
 

bjf66

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Getting on with the 2nd stringer
- have glued into boat
- fillet the joint
- started to sandwich the new/old stringer joint
- Hopefully be in position in weekend to start laying up the cloth to tie new stringer into boat
 

bjf66

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started laying up 2nd stringers today
- 1* 600grm CSM (2oz) full 1200mm long on stringer
- 1* 612grm (17oz) biaxial fabric

was going to lay up the other 2 layers but wife decided I needed to prune trees
oh well always tomorrow
 

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Baylinerchuck

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You know it's really hard sometimes to get a feel for the size and scope of a rebuild by simply looking at pictures. There is really no way to scale the repair area. That is, unless you leave a cordless drill and hand tools laying about...... I have to say, compared to what I'm dealing with, that stringer is quite large. Nice work on the layup. Looks great.
 
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