TX18 Centre stringer fit and modification
Re: TX18 Centre stringer fit and modification
Thanks Dougster, at least 2 of us agree . I think at this stage it's a case of waiting for JM to get back and see what he thinks. May need to open a new thread as the guys have advised, but would prefer to see if JM see's this first.
-
- * Bateau Builder - Expert *
- Posts: 10199
- Joined: Tue Jan 12, 2010 12:25 am
Re: TX18 Centre stringer fit and modification
So, to simplify things, you are finding a detail in the plans it appears.
The way to correct this would be relatively simple. But this is all conjecture from me and a way for dialogue, not more.
You are 5mm big at one BH and 12mm big at MW, so you have a 7mm rise in the run from BH to MW. That rise extends to the transom and so what you could do as an option would be to calculate the error in the transom which will be on the order of say 15mm. Then you might be able to cut that 15mm vee into the transom and lower the stringer, retain the inverted shape, etc.
Just offered as an idea. The designer really is the one to decide. But you could calculate the amount needed to keep the stringer flat.
If the waterlines are marked on the parts, that would help as well to make sure the sole is a consistent amount above the waterline at all transverse members.
The way to correct this would be relatively simple. But this is all conjecture from me and a way for dialogue, not more.
You are 5mm big at one BH and 12mm big at MW, so you have a 7mm rise in the run from BH to MW. That rise extends to the transom and so what you could do as an option would be to calculate the error in the transom which will be on the order of say 15mm. Then you might be able to cut that 15mm vee into the transom and lower the stringer, retain the inverted shape, etc.
Just offered as an idea. The designer really is the one to decide. But you could calculate the amount needed to keep the stringer flat.
If the waterlines are marked on the parts, that would help as well to make sure the sole is a consistent amount above the waterline at all transverse members.
Re: TX18 Centre stringer fit and modification
Hi Fallguy, Thanks for the input. I'll have another look monday. The transom fit is perfect though.
Been looking at your build, Fantastic! The build quality is excellent. I am going to be on a steep learning curve here.
Been looking at your build, Fantastic! The build quality is excellent. I am going to be on a steep learning curve here.
-
- * Bateau Builder - Expert *
- Posts: 10199
- Joined: Tue Jan 12, 2010 12:25 am
Re: TX18 Centre stringer fit and modification
Respectfully, just because the transom and stringer touch each other doesn't mean they are correct (at this point).
Ultimately, it sounds like some minor adjustment in the plans is needed. Don't build a vee!!!!
Re: TX18 Centre stringer fit and modification
For some reasoon this post did not post. All dimensions must be increased by 10% 10% to maintain the strength of the boat. Since the stringers and frames are widened out there height must be increased to support more weight, just like in a hpuse the beams must increase height the longer they span.
Vandu did you read the Instructions on Scaling I posted, it should have answered all your questions as it was written by Jacques.
Also post a question to Question to Jacques in the section above this Questions Before **** with a title like Scaling the TX18 he watches that section closer than any other.
Tom
Vandu did you read the Instructions on Scaling I posted, it should have answered all your questions as it was written by Jacques.
Also post a question to Question to Jacques in the section above this Questions Before **** with a title like Scaling the TX18 he watches that section closer than any other.
Tom
Restored Mirror Dinghy, Bought OD18 built by CL, Westlawn School of Yacht Design courses. LT US Navy 1970-1978
Re: TX18 Centre stringer fit and modification
fallguy quit talking about the waterline, please. He needs to use the baseline. Waterline varies by weight, baseline is a constant. That is why Jacques uses it to take all measurements from.fallguy1000 wrote: ↑Sat Oct 30, 2021 12:22 pm So, to simplify things, you are finding a detail in the plans it appears.
The way to correct this would be relatively simple. But this is all conjecture from me and a way for dialogue, not more.
You are 5mm big at one BH and 12mm big at MW, so you have a 7mm rise in the run from BH to MW. That rise extends to the transom and so what you could do as an option would be to calculate the error in the transom which will be on the order of say 15mm. Then you might be able to cut that 15mm vee into the transom and lower the stringer, retain the inverted shape, etc.
Just offered as an idea. The designer really is the one to decide. But you could calculate the amount needed to keep the stringer flat.
If the waterlines are marked on the parts, that would help as well to make sure the sole is a consistent amount above the waterline at all transverse members.
Tom
Last edited by TomW1 on Sat Oct 30, 2021 2:12 pm, edited 1 time in total.
Restored Mirror Dinghy, Bought OD18 built by CL, Westlawn School of Yacht Design courses. LT US Navy 1970-1978
Re: TX18 Centre stringer fit and modification
Hi Tom,TomW1 wrote: ↑Sat Oct 30, 2021 1:54 pm For some reasoon this post did not post. All dimensions must be increased by 10% 10% to maintain the strength of the boat. Since the stringers and frames are widened out there height must be increased to support more weight, just like in a hpuse the beams must increase height the longer they span.
Vandu did you read the Instructions on Scaling I posted, it should have answered all your questions as it was written by Jacques.
Also post a question to Question to Jacques in the section above this Questions Before **** with a title like Scaling the TX18 he watches that section closer than any other.
Tom
Thanks for all the help. I did read the scaling tutorial thanks. Also, in the write up on the TX18 it says we can lift the sole. I understand JM is away on holiday for a few days yet. I'll repost as advised Monday/Tuesday.
Re: TX18 Centre stringer fit and modification
(boat in its natural orientation) looking at the underhull form on the study plans, the center line of the bottom looks to be above the transom and as it goes aft it meets the transom. I would take a look back at the plans again and think about what straight means. It means several points are in the same line. it doesn’t mean parallel to another line, perpendicular to transom.
Also, the best way to get someone’s attention on the forum is to quote their user name like this. and ask you question. that way they get a notification. Otherwise you are relying on Jacques to just read through the forum.
Also, the best way to get someone’s attention on the forum is to quote their user name like this. and ask you question. that way they get a notification. Otherwise you are relying on Jacques to just read through the forum.
Re: TX18 Centre stringer fit and modification
Hi Jacques, I've done some more work on my TX20 centre stringer glitch. I would be very grateful if I could have your thoughts on the curve line superimposed in the photos and the way I have scaled the 10%.
Thanks.
Re: TX18 Centre stringer fit and modification
HI Jaques, Please could you take a quick look at this thread and confirm if I am scaling right and maybe shed some more light on the centre stringer glitch I have. Thanks.
Who is online
Users browsing this forum: Google Feedfetcher and 13 guests