My First StarCraft; 1975 18' SuperSport

[classiccat]

Re: My First StarCraft; 1975 18' SuperSport

Stopped by to see if you had a pic of the twisted sister transom you led onto in astor's thread...

Murphy is certainly making the rounds. :mad-new:

To be honest, I was starting to feel left out :lol:

nothing major...~ 1/4" twist most noticeable on the upper starboard wing. we'll see if a couple hundred pounds of water buckets can flatten it out. If not, my 16' BlueFin needs a transom

 

[Watermann]

Re: My First StarCraft; 1975 18' SuperSport

I think that may be the possible pitfall of pre cutting the transom before lamination rather that doing the big rectangle and cutting out the shape after the lamination. 1/4" isn't a big deal though, it should relax and play nice after being squashed for a while. I bet the SC factory puts them in way worse than that after what I've seen.

 

[classiccat]

Re: My First StarCraft; 1975 18' SuperSport

I think that may be the possible pitfall of pre cutting the transom before lamination rather that doing the big rectangle and cutting out the shape after the lamination. 1/4" isn't a big deal though, it should relax and play nice after being squashed for a while. I bet the SC factory puts them in way worse than that after what I've seen.

Perhaps.

Although doing a lay-up after having 1-too-many wobblies with the neighbors may have left the door wide-open for ol' Murph.

I think the screw-up involved leaving it on the horses after clamping...and going to bed :facepalm:

 

[GA_Boater]

Re: My First StarCraft; 1975 18' SuperSport

I think that may be the possible pitfall of pre cutting the transom before lamination rather that doing the big rectangle and cutting out the shape after the lamination. 1/4" isn't a big deal though, it should relax and play nice after being squashed for a while. I bet the SC factory puts them in way worse than that after what I've seen.

Are you implying that SC had lax standards? Or is the implication that SC had standards? :lol: After seeing the scribe lines on astor's and some of the riveting and a few other things, I think the answers are Yes and No.

1/4" isn't much, Blue. Is it one of the corners or across the wood? Turn it upside down and load the weights up again.

DO NOT blame the wobblie pops! Have you no standards, man? A required and necessary ingredient to successful tinning, don't ya know.

 

[astor]

Re: My First StarCraft; 1975 18' SuperSport

1/4" twist?, do you think that is enough to counteract prop walk? or should you twist another 1/8"?

 

[SigSaurP229]

Re: My First StarCraft; 1975 18' SuperSport

Dagumit you to huh Bluefin, well lets see this weekend Murphy came for You, Dozer, Watermann, and me. I wouldn't sweat a quarter inch to much I know most of the old rotten ones I've pulled out have been WAY more than 1/4" off.

 

[classiccat]

Re: My First StarCraft; 1975 18' SuperSport

Are you implying that SC had lax standards? Or is the implication that SC had standards? :lol: After seeing the scribe lines on astor's and some of the riveting and a few other things, I think the answers are Yes and No.

1/4" isn't much, Blue. Is it one of the corners or across the wood? Turn it upside down and load the weights up again.

DO NOT blame the wobblie pops! Have you no standards, man? A required and necessary ingredient to successful tinning, don't ya know.

My apologies for the finger-pointing :lol: it's a port-to-starboard twist. I did some dry-fits and it makes it extremely tight...and that's w/out the 2 layers of glass cloth.

1/4" twist?, do you think that is enough to counteract prop walk? or should you twist another 1/8"?

:lol: are you saying I could've played it off as intentional?

Late last night I setup a fulcrum to remove the twist (stabilized port-side & bottom starboard edge)...then added 5# weights incrementally from ~ transom center-edge to starboard-edge with a stand positioned 0.25" below the warped starboard edge (I don't want to overshoot).

I took a measurement this morning and she already came-down 1/16"...i'm cautiously optimistic!

Dagumit you to huh Bluefin, well lets see this weekend Murphy came for You, Dozer, Watermann, and me. I wouldn't sweat a quarter inch to much I know most of the old rotten ones I've pulled out have been WAY more than 1/4" off.

You know it Sig..should've had my defenses up after seeing his handy work on the rest of the crew's projects!

 

[classiccat]

Re: My First StarCraft; 1975 18' SuperSport

I came across this post from a gentleman that seems to know his way around epoxy/wood.

After seeing my results and reading this, if I were to do it again:

• trowel epoxy/cabosil from top-to-bottom (instead of port-to-starboard)
• tape-off the faces
• add pins to prevent the piece from sliding...i fought this while clamping.
• lay the pieces on the garage floor (with wax paper at the edges) and use sand as weight...EDIT: did the math on what it would take to "mimic" vacuum bagging (i.e. achieving 15psi). IMO 9tons is a tad too much however I'm just a hobbyist so what do i know? :noidea: :lol:

I'm still very happy with how the transom is coming along...assuming that the twist is a minor setback.

 

[GA_Boater]

Re: My First StarCraft; 1975 18' SuperSport

It wouldn't have twisted with Tite-Bond. eep:


If you got half of the twist out overnight, keep up what you're doing. It's almost gone. As far as being a tight fit, even if it was perfectly flat, added cloth is going to make for a tight fit.

 

[classiccat]

Re: My First StarCraft; 1975 18' SuperSport

It wouldn't have twisted with Tite-Bond. eep:

ooohh man, kick me while I'm down! :lol:

 

[jvanhees]

Re: My First StarCraft; 1975 18' SuperSport

It wouldn't have twisted with Tite-Bond. eep:

LOL! Looking good Blue. That was a serious clamp/weight job. Hope she straightens out for ya.

 

[GA_Boater]

Re: My First StarCraft; 1975 18' SuperSport

ooohh man, kick me while I'm down! :lol:

:tsk: :nono: LOL

Hey, Blue - I don't know if north-south or east-west troweling would really make any difference, but plenty of dry wall screws do. The equivalent of pinning.

 

[ezmobee]

Re: My First StarCraft; 1975 18' SuperSport

A tiny twist? You do know that there are bolts holding that thing in right? Non-issue.

 

[classiccat]

Re: My First StarCraft; 1975 18' SuperSport

LOL! Looking good Blue. That was a serious clamp/weight job. Hope she straightens out for ya.

Twist is gone...she's flatter than Kate Moss's derriere.

:nono: LOL

Hey, Blue - I don't know if north-south or east-west troweling would really make any difference, but plenty of dry wall screws do. The equivalent of pinning.

100% human error...I'll fall on my own sword :lol:

A tiny twist? You do know that there are bolts holding that thing in right? Non-issue.

It can be an issue if the transom skin isn't against the transom PLY particularly at the skin corners; they'll pull/distort/dimple the transom skin if the PLY doesn't conform to the compression from the bolts....especially the lower-2 bolts.

...however the good news is that the twist is gone; the only warp remaining is in the transom skin itself; it has about a 3/16" deflection which kind of bums me out.

Here's why:
I thought I was prepared to handle a thicker transom PLY...in excess of 1 5/8"...

...by moving the vertical risers forward (8 measly rivets that I can do solo)

& I designed the knee-brace to provide a little wiggle-room for glassing (1 9/16")

It turns-out i was measuring against the skin distortion <= that's why 3/16" is a kick in the nards.

...The transom wood is already snug against the brace angle making glassing out of the question unless I routed-out a recess => sounds like a bad idea :nono:

I'm not a fan of putting epoxy on PLY w/out glass...so she's getting the spar-treatment once I put in the epoxy plugs...and I breathe a sigh of relief

 

[SigSaurP229]

Re: My First StarCraft; 1975 18' SuperSport

Blue again great thorough work are you sure that you arent an engineer. Both of mine had deflection in the transom skin. I wouldnt sweat it to much you know it is a 30+ year old boat right i mean im 30 and im already starting to get some ddeflection.

 

[classiccat]

Re: My First StarCraft; 1975 18' SuperSport

Blue again great thorough work are you sure that you arent an engineer. Both of mine had deflection in the transom skin. I wouldnt sweat it to much you know it is a 30+ year old boat right i mean im 30 and im already starting to get some ddeflection.

Thanks Sig!

Not sweating it at all...just a little irritated that it polluted my calculations/measurements.

(I am an engineer)

 

[Watermann]

Re: My First StarCraft; 1975 18' SuperSport

Nothing can stand up against the might of the STARMADA! Twist schmist... meh :heh:

 

[jvanhees]

Re: My First StarCraft; 1975 18' SuperSport

Twist is gone...she's flatter than Kate Moss's derriere.

Blue again great thorough work are you sure that you arent an engineer. Both of mine had deflection in the transom skin. I wouldnt sweat it to much you know it is a 30+ year old boat right i mean im 30 and im already starting to get some ddeflection.

:laugh::laugh::laugh::laugh:

 

[barato2]

Re: My First StarCraft; 1975 18' SuperSport

DO NOT blame the wobblie pops! Have you no standards, man? A required and necessary ingredient to successful tinning, don't ya know.

yeah, it's called pump priming. surely you didn't think they used virgin aluminum to build these crocks?

on the Tite-Bond issue, i think you brung that one on yerself, what wit yer glue snobbery and all.....


seriously, nice work, as always. you're one of the folks on here i look to learn "how to do it". not to mention that i see you as the keeper of the Bridge of Doom in the Monty Python holy grail movie....the tin recyclers meet your questions about whether that crock really could be fixed rather than melted down, can't answer them, and are flung into the abyss!

 

[classiccat]

Re: My First StarCraft; 1975 18' SuperSport

DO NOT blame the wobblie pops! Have you no standards, man? A required and necessary ingredient to successful tinning, don't ya know.

yeah, it's called pump priming. surely you didn't think they used virgin aluminum to build these crocks?

on the Tite-Bond issue, i think you brung that one on yerself, what wit yer glue snobbery and all.....


seriously, nice work, as always. you're one of the folks on here i look to learn "how to do it". not to mention that i see you as the keeper of the Bridge of Doom in the Monty Python holy grail movie....the tin recyclers meet your questions about whether that crock really could be fixed rather than melted down, can't answer them, and are flung into the abyss!

Thank you kind Sir! What... is your favourite colour?

I probably get more enjoyment out of the process than I do the finished product...which hopefully can give the mob some insight into my "snobbery"! :tea: