|Nov 23, 2013, 04:41 AM|
Close to laminating the hull shell.
right now Iīm mainly concerned about the biggest diameter of the hull, as it seems to extend the 1 meter the fibreglass (or carbonfibre) is wide.
Maybe Iīll have to reduce the freeboard again to the height it originally had.
Iīm planning to laminate that hull seemless...
This will reduce the necessary sanding after the laminate has hardened a lot.
Iīve allready bought the e-motors, props and so on.
The funny thing is - I now have these 2 Graupner Speed 700 BB, which are actually big motors, but compared to this hull they just look like tiny saildrives now...
Radius ( itīs the same throughout the whole hull) cut and sanded.
Last thing to do before laminating will be to cut the stern to the right angle and
make a small radius (about 0.5-1.0cm) for the bowsection and also at the stern.
And itīs clear now - Iīll have to reduce the freeboard 1" to 22.5cm again instead of 25 cm I wanted in between.
|Nov 26, 2013, 04:15 AM|
as this is a 2 meter hull at 1/16 it represents a junk of 32 m hull length.
Length/width ratio 1/4.
It will be a Hongkong style junk, not really Zheng He style.
(I digged a bit into the topic of Zheng Heīs huge treasure ships,
which are said to have up to 9 masts, but somehow the single informations
donīt really fit together/make sense to me...)
There will be three Masts/sails.
|Nov 27, 2013, 05:51 AM|
While the big plug is waiting anxiously...
...I continued with the underwater part of my medium sized junk plug.
Bow extended like I did with the big plug and
bow sanding completed.
You may have noticed several gaps and holes in these foam plugs.
The good thing is - that doesnīt matter at all!
You just need to make sure nothing stands out of the foam surface.
This will be one off builds and the fibreglass (carbonfibre) simply will be wrapped around outside of the plugs. This way the cloth just gets pulled down and straightens out itself therefore.
Safes a lot of sanding time after curing.
|Nov 28, 2013, 05:44 PM|
Joined Oct 2006
fee fye foam fun...lets face it disabled.......you're just a foam freak .....if i had the dough....i'd be making all my favorite hull shapes out of foam....forget about finishing the ships....actually i'll be insulating the basement walls of the little home we purchased in burns lake bc. with 2" styrofoam...sooooooo....i'm almost tempted if there's any leftover.
|Nov 29, 2013, 03:46 AM|
Good to see you havenīt abandoned this forum.
Foam freak - yes, at least some sort of...
You know, Iīm actually a one eyed bastard.
Means, I canīt really SEE three dimensions.
I know theyīre there - but I canīt see them.
So I got to FEEL them.
And foam is the best way for me to achive that,
before I can build the actual hull shell.
Have fun with your basement.
|Dec 02, 2013, 06:18 AM|
Making my carbon junk hull a reality!
Saturday morning was a good day for me to laminate the big plug, I thought.
But I hadnīt done any laminating for more than a year, my physical condition isnīt the best, so I was a bit concerned if Iīm really able to get it done.
What the heck...
So I checked what carbonfibre I had standing around unused on their rolls for more than a year, started cutting and prepared the epoxy resin.
Mixed 1.4 kg epoxy very thoroughly, rolled it onto the whole foam plug and started with one layer of peelply 1.05 gr/m2 twill.
Yes, peelply as the first layer, as I donīt want to spend my time sanding the hull inside as well. Then rolled the remaining resin onto it.
Then one layer of 163 gr/m2 carbon twill. The epoxy gets sucked through the carbon from below easily. Of course I wear rubbergloves for that job.
Stretched the carbon out nicely over the whole plug.
Time for a cigarette break...
Then I mixed another 1.4 kg of epoxy resin and rolled it all over the hull surface again. Next was one layer of 144 gr/m2 of carbon, but thatīs different a type of +45 degrees/-45 degrees biaxial cloth. This gives good diagonal hull stability.
Was a bit trickier to wrap it around the shell nicely and I was a bit concerned in between about the open curing time of the resin (40.min) but in the end it worked out fine.
Third layer was 163 gr./m2 carbon linnen, which I expected to make more problems to follow the hull lines nicely - but it worked out easier than I expected.
Rolled the remaining resin onto the carbon, making sure there are no airbubbles left underneath of the laminate.
Took me about 5 hours to do all that.
Actual laminating time from 11 a.m. to 4 p.m.
I was satisfied, but also quite exhausted at that point.
Time for a shower...sweating, smelling...
The laminate is not complete yet, as I want to add another layer of 163gr/m2 carbon linnen plus two layers of 80gr. glass on top for a finer surface.
I have to sand the carbon shell in between, as the resin of course has cured in between - and it didnīt turn out as smooth as I wanted it to be.
But it is allready really hard. I used the - more expensive - R&G epoxy resin this time, as the cheaper stuff didnīt get as hard last time as desired.
Sometimes it turns out to be more expensive to use cheap stuff, īcause the frustration of a bad result can pull you down quite a bit.
In my case for more than a year...
But anyway - this is an actual 2 meter carbon/epoxy hull shell from now on - not only a huge foam plug to imagine the final shape of my personal junk.
After a nice saturday evening with my girlfriend and a good night sleep I walked back on sunday morning to my tiny appartment (shipmodelworkshop with a bed in it ) and started to stroke my new pitchblack hull shell...then I decided to put on my working clothes and my rubbergloves and started sanding...
not done yet, but today the new week has just begun.
|Dec 02, 2013, 09:29 AM|
Got some sanding done...
... but I have to confess that I wasnīt really in the mood for that tough kind of work today ...
|Dec 03, 2013, 02:46 AM|
... or a coffin. Man, that is one big displacement hull! I trust you'll have more than a few kilo of lead in the bilge and a large balanced rudder to steer her. She's looking good!
BTW, I should have recommended before you read Hummel Hummel, written by E. Allen Petersen which chronicles the voyage of a small 2-masted junk from Japanese-occupied Shanghai to Los Angeles. The junk was built in 1936 for a German businessman living in Shanghai who sold the junk to Petersen, an American, & his Japanese-American wife, Tani, the so they could escape China in April 1938. Two additional passengers, both White Russians, sailed with them to America. Am sure you'll enjoy the read to see how four novice laowai sailed a junk across the Pacific.
You can download the ebook for free or get a real book from Amazon:
Petersen's NYT obit: http://www.nytimes.com/1987/06/14/ob...oat-in-38.html
|Dec 03, 2013, 08:22 AM|
I still have this huge/heavy bulbkeel unfinished...
Which I originally started to build for my pirate galeon:
Two halves of about 7 kg lead for each.
Actually I designed this big junk hull to fit for this keel.
Will go about 32 cm below the hull.
Overall displacement about 30-32 kg.
So there will be some more internal ballast too.
Should be enough stability...
But this 2 meter junk hull is neither big enough as a bathtube nor for a coffin.
And with 32 dm3 it also doesnīt have enough displacement for a rowboat.
It is just a bit bigger shipmodel - nothing more.
As you can see in the other pics, 2 meters are just a nice size for rc-modelboats for me - but I used to design, calculate and also build bigger boats back then.
The 33ft. pacific proa I built together with the owner in 1994-1995 and the 20ft. proa where the last bigger projects I made myself, except the extension of a 105ft. riverbarge into a floating restaurant with 120 seats...
There was this old river barge with a steel hull and in spring 1997 we - the owner, two to three labourers and myself as the shipwright - built a wooden construction on top of the hull, also extending itīs width from 17ft. to 20ft. Actually we built a complete additional floor onto that hull.
Some years after that it became the "Vienna City Beach Club" and it was completely restorated in 2012 and the ship is called the "White Pearl" now.
So itīs still there. check out http://vcbc.at/
One reason why I write and show you this:
My 2 meter junk model at a 1/16 scale model represents a 32 meters long ship.
And the "White Pearl" is also 32 meters long.
So I know how a ship of that size feels...
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