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Author Topic: 71 22-2 Flatback Re-build Watch and Comment Please  (Read 15189 times)

July 21, 2018, 04:03:47 PM
Reply #75

Marcel4t

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Re: 71 22-2 Flatback Re-build Watch and Comment Please
« Reply #75 on: July 21, 2018, 04:03:47 PM »
Got all the glass cut to size for inner skin!  I have 5 layers, 2 to fill in some of the space of the void that's being closed in, and then 3 with tabs going 12", 8" and 4".  I'm using DirtwheelsFl's method of clamping all the layers on top, flipping them all over the back, then pulling them back into boat one at a time to lay up.  Going to do it first this tomorrow morning, as this afternoon was a "feels like" of 104*. My GF is going to help, mixing epoxy while I am in boat spreading fillets then laying glass. 
Im super excited!!   

1971 222

July 21, 2018, 05:52:26 PM
Reply #76

theFunsmith

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Re: 71 22-2 Flatback Re-build Watch and Comment Please
« Reply #76 on: July 21, 2018, 05:52:26 PM »
I like the method, it makes a ton of sense to me. Stay cool over there.

July 24, 2018, 08:52:53 AM
Reply #77

Marcel4t

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Re: 71 22-2 Flatback Re-build Watch and Comment Please
« Reply #77 on: July 24, 2018, 08:52:53 AM »
Got 5 layers of glass put in!  2 in the void that's being closed in, and 3 on top of that.  Tabbed 12"-8"-4".  I think I may add a couple more layers in the area being closed in, still not even with the rest of the glass.  Onto the Coosa install!
1971 222

July 24, 2018, 05:41:45 PM
Reply #78

RickK

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Re: 71 22-2 Flatback Re-build Watch and Comment Please
« Reply #78 on: July 24, 2018, 05:41:45 PM »
Glad to see you put the pipe in - wish I had thought of it before I did my transom. You'll be happy, especially after you add 3 more layers of glass in front of the core.  Looks good.

Next step is to let cure for a while - I would wait until next weekend to make sure it's cured.  The scruff it with a 60 or 80 grit flap sanding wheel.  Then mix a thick resin mix to use for fillets in the corners and to trowel onto the inside of the transom, then lay in your core and clamp it in.  Have you figured out how you're going to clamp it in?
Rick
1971 "170" with 115 Johnson (It's usable but not 100% finished)

1992 230 Explorer with 250 Yamaha

July 26, 2018, 05:03:49 PM
Reply #79

Marcel4t

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Re: 71 22-2 Flatback Re-build Watch and Comment Please
« Reply #79 on: July 26, 2018, 05:03:49 PM »
Thanks Rick!  Im going to clamp it by using 4 x 4s on both side, clamped together with threaded rods and bolts.  Im going to try and use some of the 73 holes already in transom as I can.  I was not aware epoxy needed that long to cure, good to know.
1971 222

July 26, 2018, 10:45:33 PM
Reply #80

RickK

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Re: 71 22-2 Flatback Re-build Watch and Comment Please
« Reply #80 on: July 26, 2018, 10:45:33 PM »
 You have the slow, medium and fast mix of epoxy and that is dependant on the climate.  Slow in the summer is ok but has a mind of it's own, fast in the summer may catch you by surprise.  Slow in the winter - oh my, it could be a week, while fast may be a day.  You have to experiment and waiting too long for it to totally cure is never an issue. Better safe than sorry.
Now, Poly has a short fuse as per time.....You end up hoping it will not set before you are done laminating!!  Epoxy has much more cure time.
Rick
1971 "170" with 115 Johnson (It's usable but not 100% finished)

1992 230 Explorer with 250 Yamaha

July 26, 2018, 11:42:40 PM
Reply #81

Marcel4t

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Re: 71 22-2 Flatback Re-build Watch and Comment Please
« Reply #81 on: July 26, 2018, 11:42:40 PM »
Yea, I am using medium US Composites epoxy. 
Today's my B-day, and my girlfriend got me this!  It's coming in from Japan though, so the wait will be agonizing...

1971 222

July 27, 2018, 06:34:14 AM
Reply #82

mshugg

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Re: 71 22-2 Flatback Re-build Watch and Comment Please
« Reply #82 on: July 27, 2018, 06:34:14 AM »
You have the slow, medium and fast mix of epoxy and that is dependant on the climate.  Slow in the summer is ok but has a mind of it's own, fast in the summer may catch you by surprise.  Slow in the winter - oh my, it could be a week, while fast may be a day.  You have to experiment and waiting too long for it to totally cure is never an issue. Better safe than sorry.
Now, Poly has a short fuse as per time.....You end up hoping it will not set before you are done laminating!!  Epoxy has much more cure time.

I used Raka with slow hardner for almost everything.  There were some winter days I used some fast for bonding. This was for Florida.   You can also adjust the cure time by controlling the temperature.  For example keep the epoxy in the AC before use, or even refrigerate the hardner overnight before use.

One thing that I would add to what Rick said.  If you can dent the surface with a thumbnail(generally <24hrs), you can recoat without sanding.  This can save you a lot of work, plus you get a chemical bond between layers.  Less work+ stronger bond= good thing.

July 27, 2018, 02:55:05 PM
Reply #83

RickK

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Re: 71 22-2 Flatback Re-build Watch and Comment Please
« Reply #83 on: July 27, 2018, 02:55:05 PM »
 :b-day3:
Rick
1971 "170" with 115 Johnson (It's usable but not 100% finished)

1992 230 Explorer with 250 Yamaha

July 28, 2018, 04:55:41 PM
Reply #84

Marcel4t

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Re: 71 22-2 Flatback Re-build Watch and Comment Please
« Reply #84 on: July 28, 2018, 04:55:41 PM »
:b-day3:
Thanks Rick!  It was a good B-day! 
Got this done today, ready to be clamped in. I forgot where I read it, but someone suggested setting the sides of the transom 1/2" below the hull side, so it could be capped off.  Thank you for that suggestion.  I beveled the top also so a cap could lay flat on top. 

1971 222

July 28, 2018, 06:07:42 PM
Reply #85

FL.flatback

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Re: 71 22-2 Flatback Re-build Watch and Comment Please
« Reply #85 on: July 28, 2018, 06:07:42 PM »
Man you're really moving along. Don't look like the rain here has slowed you down. :thumright:

July 28, 2018, 06:25:55 PM
Reply #86

Marcel4t

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Re: 71 22-2 Flatback Re-build Watch and Comment Please
« Reply #86 on: July 28, 2018, 06:25:55 PM »
Man you're really moving along. Don't look like the rain here has slowed you down. :thumright:
Seems like the rain has been hovering over your house out in the Everglades much more.   I actually like it when it rains, suns gone so it's cooler and Im under canopy.  i have been getting excited, so been putting more energy into it lately.
Let me know when you can swing on by. 
1971 222

July 28, 2018, 10:39:47 PM
Reply #87

Marcel4t

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Re: 71 22-2 Flatback Re-build Watch and Comment Please
« Reply #87 on: July 28, 2018, 10:39:47 PM »
Newest video of the transom rebuild. 
Hope you guys like these.  I was looking and looking for good outboard rebuild vids and couldnt find many.  Hopefully these help people down the road.

https://youtu.be/rtbqUFsE4XY

1971 222

July 29, 2018, 02:50:02 AM
Reply #88

theFunsmith

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Re: 71 22-2 Flatback Re-build Watch and Comment Please
« Reply #88 on: July 29, 2018, 02:50:02 AM »
That was a good watch, I loved the time-lapse of the layup.

July 29, 2018, 07:51:58 AM
Reply #89

RickK

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Re: 71 22-2 Flatback Re-build Watch and Comment Please
« Reply #89 on: July 29, 2018, 07:51:58 AM »
Yup, good video and I agree that the time lapse was fun to watch.  If it only took that little time to do this stuff...
Rick
1971 "170" with 115 Johnson (It's usable but not 100% finished)

1992 230 Explorer with 250 Yamaha

 


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