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Author Topic: How to do this... ( reshape the bow section )  (Read 1116 times)

U-33

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How to do this... ( reshape the bow section )
« on: April 20, 2017, 03:16:19 PM »

Right chaps...if all goes well and I can get a destroyer hull, I'll need to reshape the bow section. Any ideas as to how to go from the left hand image to the right hand image?
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Rich

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dougal99

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Re: How to do this...
« Reply #1 on: April 20, 2017, 04:06:32 PM »

An isometric drawing would be a good start. As  it is, it is difficult to see what you are trying to achieve.
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U-33

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Re: How to do this...
« Reply #2 on: April 20, 2017, 04:27:13 PM »

Eh? 
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Rich

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davidm1945

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Re: How to do this...
« Reply #3 on: April 20, 2017, 05:21:21 PM »

I've seen lots of ships with the left-hand bow shape but what is the right-hand one? Can you elucidate?  %)

Dave.
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tattooed

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Re: How to do this...
« Reply #4 on: April 20, 2017, 07:11:30 PM »

are you building the uss zumwalt rich
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U-33

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Re: How to do this...
« Reply #5 on: April 20, 2017, 08:18:42 PM »

Not Zumwalt mate...a sort of semi scale Sea Wraith.
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Rich

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dougal99

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Re: How to do this...
« Reply #6 on: April 20, 2017, 10:01:31 PM »

Is this the type of thing? if so a standard hull will need some major plastic surgery. The bow will probably have to be removed at around the point of maximum beam and the a new bow created in the desired shape. I recommend a test rig from cardboard and balsa. Good luck.
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U-33

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Re: How to do this...
« Reply #7 on: April 20, 2017, 10:16:47 PM »

That's more or less it...it'll be fun and games doing it. I sense boxes of filler....
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Rich

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ballastanksian

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Re: How to do this...
« Reply #8 on: April 20, 2017, 10:27:16 PM »

It is a shame the card kit of Sea wraith seems to be unavailable as this would give you much of the plate shapes etc that could just be enlarged.

What are you going to do with the destroyer bow if you do go down the modifcation route?
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malcolmfrary

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Re: How to do this...
« Reply #9 on: April 21, 2017, 08:14:50 AM »

Eh?
Isometric drawing - take the front, side and top views and combine them to get a 3D view on 2D paper with the right dimensions but lacking perspective.
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tigertiger

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Re: How to do this...
« Reply #10 on: April 21, 2017, 08:17:11 AM »

I think you mean orthographic projection.
Pic 1


Isometric is pic 2.



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U-33

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Re: How to do this...
« Reply #11 on: April 21, 2017, 08:40:04 AM »

I knew I shouldn't have posted this.. :embarrassed:  farr too technical for an old fart like me.


Right, I don't want to go too radical with the bow shape, the pic that Dougal put up is about right...maybe a bit too much, but along those lines.
I was thinking of using a block of balsa epoxied into the bows (after cutting the existing piece out) and then sanding it to shape...a coat of resin over it to protect it should strengthen it sufficently.


A superstructure built up from thin styrene sheet, in a series of odd shaped boxes to give it that 'stealth' look, with the running gear consisting of two motors/shafts/rudders and a water pump based bow thruster. And that is basically it...I did have a go at one a few years back, based on a styrene yacht hull, but I built the superstructure far too heavy, and the finished product kept falling over, so it ended up being filed under B1N.
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Rich

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tigertiger

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Re: How to do this...
« Reply #12 on: April 21, 2017, 09:19:29 AM »


If we can establish the basic shape you want, that will give us good start point.
OK, looking at your original pics, it looks like your bow goes deeper into the water as you go forward. And the frames would be, in part, like upside-down triangles. Like in the Att pic. Is that correct?


If it is like the pic, it gives an idea of the frame profiles you would need. You could then use planks and flat pieces of balsa as needed, and carve a block of balsa for the 'nose'.

More pics here https://www.google.com/imgres?imgurl=http%3A%2F%2Fblufiles.storage.msn.com%2Fy1plUZMLq02hf3N0j7XyssIQOKpnFw9fO-v6A8cOqW2fHUYO447ii3LH4lMhDY_yCwWwiH3Wqu0xtUE2UciEltHhw%3FPARTNER%3DWRITER&imgrefurl=https%3A%2F%2Fdtashji.wordpress.com%2F2008%2F01%2F01%2Fnaval-forces-changing-course-from-blue-water-to-the-littoral%2F&docid=5rR95xkMnlEdDM&tbnid=9rcDz5-Rpa_ORM%3A&vet=10ahUKEwiNldOBj7XTAhUD3GMKHSZ1DNUQMwhMKB8wHw..i&w=599&h=449&bih=490&biw=1093&q=wave%20cutter%20hull%20shape&ved=0ahUKEwiNldOBj7XTAhUD3GMKHSZ1DNUQMwhMKB8wHw&iact=mrc&uact=8
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dougal99

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Re: How to do this...
« Reply #13 on: April 21, 2017, 09:20:18 AM »

Block balsa is one way to go but where (how far back) would you put your bow thruster?
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U-33

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Re: How to do this...
« Reply #14 on: April 21, 2017, 09:38:45 AM »

TT...you are spot on there, sir. That's the sort of thing I'm after creating...


Dougal...you have discovered a fatal flaw in my idea...maybe the bow thruster would end up becoming a centre thruster.  :embarrassed:
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Rich

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tigertiger

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Re: How to do this...
« Reply #15 on: April 21, 2017, 09:44:25 AM »

These might work. Bow thruster would need a bit of fancy plumbing instead of the usual straight pipe.
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U-33

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Re: How to do this...
« Reply #16 on: April 21, 2017, 10:02:41 AM »

Now we're getting somewhere...the bow thruster will be nothing more than a screenwash pump, sucking water in one way and blowing it out of the other. Dead simple, easy to plumb in using silicone tubing, and above all...it works.


Thanks TT...you've hit the spot there.
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Rich

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tigertiger

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Re: How to do this...
« Reply #17 on: April 21, 2017, 12:38:43 PM »

Glad I could be of help  :-))


The only other thing I would add is 'L' pieces on the ends of the silicon pipe to help the water out at useful angles, more easily..
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U-33

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Re: How to do this...
« Reply #18 on: April 21, 2017, 12:43:12 PM »

Top man, TT...  :kiss:
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Rich

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surfs up

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Re: How to do this...
« Reply #19 on: April 21, 2017, 12:54:03 PM »

Here are some photos of my HMS Vectra, the front is a chunk of balsa the rest is 1/16 ply.
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U-33

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Re: How to do this...
« Reply #20 on: April 21, 2017, 01:10:02 PM »

Now that is as near as dammit what I want to do Surf...what scale/size is that?


I've sent you a pm, by the way..
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Rich

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surfs up

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Re: How to do this...
« Reply #21 on: April 21, 2017, 01:48:23 PM »

Rich
pm returned


Surf
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Big Ada

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Re: How to do this...
« Reply #22 on: April 21, 2017, 06:03:40 PM »

Wont that turn in to a Sub if it hits a Wave head on ?. %)

Len.
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U-33

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Re: How to do this...
« Reply #23 on: April 21, 2017, 08:01:53 PM »

Umm...it shouldn't do.
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Rich

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U-33

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Re: How to do this...
« Reply #24 on: April 21, 2017, 08:30:08 PM »

I'm sort of thinking that the easiest way to achieve this is to use one of Glynn Guest's destroyer plans, and building the new bow shape into/onto it. That would save  hacking a perfectly good fibreglass hull to pieces, I think.
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Rich

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