Somehow I twisted my hull

[CJensen]

I've really been enjoying my vanguard model's Sherbourne build..   It has been a great Christmas present.  I followed the instructions on first planking, ( I added 2 planks on a side and attached with the brass nails before switching to the other side and adding 2 more).   When I started the 2nd planking with the pear wood, I did just one side entirely and got about a third done with the other side when I noticed that the hull was twisted.

 

I am puzzled on how I did this.  All of the laser cut MDF parts fit together well and with all the parts and layers, it felt very ridged.  I do not believe that the way I did the second planking could have done this since the first layer was solid and dry.

 

SO did I screw up the first layer of planking?  I feel like I did 2 planks on side A, then 2 on side B.  Then back to A and then B.  Did I somehow twist it by always adding the new layers on side A first?

 

Any thoughts would be helpful.

 

In the picture I attached, looks like the keel is perpendicular to the hull, but the keel in the  bow it not on the same centerline with the stern.

[vossiewulf]

Are you sure it wasn't there before the first planking? The process you followed shouldn't have made it twisted but I would have kept up the two strakes on one side followed by two strakes on the other side in the second planking to be ultra sure.

 

[Dziadeczek]

I always glue ONE plank interchangeably on each side of a hull at a time and proceed the same for the remainder of planks. I prebend the wet planks off the model so that they almost fit the shape of the hull, nothing forceful!

I only place ONE layer of planks, no second coats necessary.

[wefalck]

"I only place ONE layer of planks, no second coats necessary." ... In POB kit-construction that depends on the spacing of the bulkheads that was chosen by the manufacturer. In many cases the spacing is too wide, resulting in 'kinks' in the first planking that needs to be evened out.

 

A safer construction with less chances of distortion during planking would be to fill the spaces between the bulkheads with pieces of wood, which also makes fairing the hull easier ...

[CPDDET]

I'm wondering if forced edge bending was used. And if so, how often. Would this be enough to distort the hull?

[gieb8688]

The follow up question is, "What can be done to resolve the issue?"

[Gregory]

29 minutes ago, gieb8688 said:

The follow up question is, "What can be done to resolve the issue?"

If the hull really is twisted, (bent, warped ) by a noticeable amount, the only resolution would be to do it over.

 

The problem is not really that apparent to me from the image above.

On what plane is the hull " twisted" ?

The stem is not square to the work table, or perpendicular to the line of sight.

A  straight on view where the deck is visible might be provide more information.

 

What do you see if you sight along the keel itself?   Do you have an image like that above, but with the hull inverted?

 

[wefalck]

The stempost leans to port compared to the transom.

 

The only solution seems to be to rip off the planking and hope that the ‘backbone’ straightens itself again.

Edited Friday at 02:55 PM by wefalck

[Gregory]

20 minutes ago, wefalck said:

The stempost leans to port compared to the transom.

 

The stem is not square to the table or the camera.  The perspective is skewed.  I don't see any reference on the transom to show me where the problem lies

[TBlack]

44 minutes ago, Gregory said:

If the hull really is twisted, (bent, warped ) by a noticeable amount, the only resolution would be to do it over.

 

The problem is not really that apparent to me from the image above.

 

If you sight along the top of the stempost against the transom (top is barely visible in the photo), you can see the twist. The stempost should bisect the transom.

[Gregory]

"Twist" Or skew?  I'm not saying there is no warping, but the perspective distorts the actual amount.

 

It may be so subtle as to not be something to worry about with regard to the final presentation of the model.

[CJensen]

14 hours ago, gieb8688 said:

The follow up question is, "What can be done to resolve the issue?"

When I noticed the problem, the second layer on one side was CA glued on and I am not sure how to remove that.   I guess I could try to remove everything down to the bulkheads with aggressive sanding, but I am moving forward.   The hull was painted white today and I am waiting til morning to do some touch ups before I remove the painters tape so I can take one of those pictures that will show things better.

 

I have been very impressed with the quality of this model and I am sure there is more that I can learn.  This is my fourth model after having built a couple of midwest boats and the longboat from model shipways.  I have had problems learning experiences with each of them,   just steps on getting better.

 

Thanks for all the replies and DMs 

[CJensen]

12 hours ago, Gregory said:

"Twist" Or skew?  I'm not saying there is no warping, but the perspective distorts the actual amount.

 

It may be so subtle as to not be something to worry about with regard to the final presentation of the model.

I am  a carpenter by trade, so I am thinking about a board that is not flat.

 

If you grabbed the ends of a baguette in each hand and turned one hand clockwise and the other counter clockwise, that is the kind of twist I am referring to.

[vossiewulf]

12 minutes ago, CJensen said:

If you grabbed the ends of a baguette in each hand and turned one hand clockwise and the other counter clockwise, that is the kind of twist I am referring to.

When I worked in a customer furniture shop many eons ago in college, we called that a "wind" pronounced like winding a clock.

 

If you used CA, god himself is not getting that hull back apart, you can either stop or keep going but there's no fixing it. At a minimum it's an object lesson to watch closely for that next time.

 

[Johnny Mike]

I had the same thing happen years ago building the US Dallas.  I am sure it was because I planned one side more than the other before I noticed it.

I did a lot of trying to straighten it without much luck. I eventually decided to soak a towel in water and wrap the whole hull and firmly clamp the bow and stern in c-clamps and gently over torqued the hull slightly. I did not have all the planking on so I could twist the hull slightly. I kept the towel damp for a week. It worked and I still have the ship today. If you look very close you can see a very slight twist but now much.

[Isaiah]

I’m am also building the Sherbourne.

 

I found when I added the false deck piece I didn’t make the fit loose enough. As a result it twisted the frames. I’m not sure if that’s what caused your twist but I thought I’d share.

 

This was the only way I could think of to fix the twist. While glue around all the frames was drying, I held the ship in the vice. I clamped one end and added tension to the rope. Rough, I know, but it worked.

 

I don’t think you’ll be able to use the same method as I did as you already have planks on, unless you take all the planks off which may not be an option.

 

 

Edited 2 hours ago by Isaiah