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Author Topic: 32nd Parallel XXI  (Read 13114 times)

TomP

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32nd Parallel XXI
« on: October 08, 2012, 10:00:51 PM »

Hi, Well this will be a slow build but I have started by marking the weld lines onto the hull from the Fritz Kohl drawings I have blown up to 1:32 scale. Started also drawing the deck which I will get made out of brass along with the flood grates along the hull. Only 1 thing where to cut the hull to gain access to the inside? Hull comes in two halves so will need joining. Cheers Tom


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Subculture

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Re: 32nd Parallel XXI
« Reply #1 on: October 10, 2012, 10:26:01 AM »

You could split it radially, two cuts, one towards to the front, another towards the rear. This will make the boat easier to transport and store.

TomP

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Re: 32nd Parallel XXI
« Reply #2 on: October 26, 2012, 09:26:34 PM »

Some pictures of the XXI









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TomP

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Re: 32nd Parallel XXI
« Reply #3 on: March 14, 2014, 02:27:02 PM »

Just had the proof back from phd-design-etchings.co.uk slowly very slowly moving forward


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Martin [Admin]

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Re: 32nd Parallel XXI
« Reply #4 on: March 14, 2014, 03:42:53 PM »

 
Hey Tom!

How old is your kit?
 I thought 32nd Parallel stopped trading years ago....
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Subculture

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Re: 32nd Parallel XXI
« Reply #5 on: March 14, 2014, 05:17:02 PM »

Yep, they stopped trading over 15 years ago. AFAIK the XXI was never officially a kit as such, there were a few prototype hulls punted out, and this is one of them.

TomP

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Re: 32nd Parallel XXI
« Reply #6 on: March 28, 2014, 06:58:04 PM »

Design work back from phd-design-etchings.co.uk for the Fumo transmitter I'm very very pleased!

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spooksgone

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Re: 32nd Parallel XXI
« Reply #7 on: March 31, 2014, 04:43:44 PM »

Wow! That is very impresive. How is the rest of the boat coming along, and the S class?
Cheers Tomp.
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TomP

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Re: 32nd Parallel XXI
« Reply #8 on: April 08, 2014, 12:31:03 PM »

Hi Phil, yeah really pleased with it, S class is also slowly moving on will be painting soon few lumps and bumps to sort first hope it wont take too long hows your destroyer going??
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spooksgone

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Re: 32nd Parallel XXI
« Reply #9 on: April 08, 2014, 05:24:50 PM »

Pm sent
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TomP

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Re: 32nd Parallel XXI
« Reply #10 on: May 09, 2014, 09:03:45 PM »

I have the deck now but what would be best to use to bond nickel silver to the GRP hull?
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Subculture

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Re: 32nd Parallel XXI
« Reply #11 on: May 09, 2014, 09:17:40 PM »

Twin part acrylic glue. Have a word with Starloc adhesives, they'll advise you on the best product.

A good quality slow cure epoxy should also work fine, but I think the acrylic glue will be superior.

TomP

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Re: 32nd Parallel XXI
« Reply #12 on: May 13, 2014, 12:21:34 PM »

Thanks Subculture used slow cure epoxy worked well cheers
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Subculture

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Re: 32nd Parallel XXI
« Reply #13 on: May 13, 2014, 03:03:16 PM »

Good stuff. The deck shouldn't tax the adhesive much, as there is a lot of surface area and the expansion rate of GRP is fairly close to nickel silver.

spooksgone

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Re: 32nd Parallel XXI
« Reply #14 on: May 13, 2014, 03:45:08 PM »

Hi Tomp. Any chance of some pics of the progres so far? I would love to see some.
Cheers Tomp.
Phil
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TomP

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Re: 32nd Parallel XXI
« Reply #15 on: May 14, 2014, 11:24:38 PM »

Hi Phil, how are you? Your wish is my command, spent a few hours on it Saturday put the deck on and joined both halves


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Subculture

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Re: 32nd Parallel XXI
« Reply #16 on: May 15, 2014, 10:09:51 AM »

Looks very nice. I'd get some braces in that hull though, otherwise it'll move. G10 expoy glass sheet is very good for this, or you can make you own fibreglass sheet inexpensively by sandwiching saturated cloth between waxed melamine boards.

spooksgone

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Re: 32nd Parallel XXI
« Reply #17 on: May 15, 2014, 02:50:03 PM »

Wow, looking very nice so far, the missus just asked me why I have turned a funny shade of green. Thanks for the pics Tomp.
Regards.
Phil  :-))
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Subculture

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Re: 32nd Parallel XXI
« Reply #18 on: May 15, 2014, 06:19:22 PM »

When you come to painting, I recommend you use a either a good two part epoxy primer or a decent etch primer. My preference is with the former as it's better stuff. Otherwise any paint you put on will merrily chip off your photoetched deck.

TomP

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Re: 32nd Parallel XXI
« Reply #19 on: May 15, 2014, 07:37:42 PM »

Thank you both, yeah I'm quite pleased with it. I was going to build a Skelton inside consisting of bulkheads and braces to give it some strength. I was recommended Teroson etching primer which should be ok with acrylic paint when I get to that point a long way off from that. Once I have done the internal bits then need to build some parts for the stern
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TomP

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Re: 32nd Parallel XXI
« Reply #20 on: May 22, 2014, 08:18:33 PM »

Temporary tacked the bulkheads in to see how well they fit just need to make the cross braces and then secure it in place. Will it be ok to use Fast Glass from halfords to secure it in? The plastic is PVC I think
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Subculture

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Re: 32nd Parallel XXI
« Reply #21 on: May 23, 2014, 12:07:05 PM »

I've personally found that polyester resin isn't a very good glue except when bonding other polyester resin parts together, and is also best used in conjunction with glass tape reinforcement as polyester resin alone is rather brittle. I would suggest using a good acrylic adhesive (best), or more of the slow cure epoxy as this is tougher and will deal with the wide variation in expansion rates between PVC and the glass fibre hull which will stress those areas.

Rough the PVC parts up well where the bonds will be, as the adhesion will be mechanical not chemical.

Davy1

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Re: 32nd Parallel XXI
« Reply #22 on: June 05, 2014, 03:45:58 PM »

Hi TomP,

Very nice build log. I wonder if you have given much consideration to the rudder and turning circle?

I say this because I have recently put a partial rebuild of a Darnell Type XXI back on the water and my experience backs up most people's experience of the Type XXI - the rudder is not very effective.

David
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Subculture

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Re: 32nd Parallel XXI
« Reply #23 on: June 05, 2014, 04:29:12 PM »

Some builders cheat a little and put in parallel mounted shafts and/or extended rudders. Another possibility if you have splayed shafts is to make a topsy turvy motor mixer which speeds up the inside motor on a turn and slows the outer one down.

I guess this is why the Russians put in a third prop on the Type XXI inspired Foxtrot class.

TomP

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Re: 32nd Parallel XXI
« Reply #24 on: June 05, 2014, 07:31:43 PM »

Hi David, thank you yeah I have thought about it. I had an email from Mike Dory about the XXI he built he said it didn't turn very well. I'm currently building the rear planes but like Subculture said I'm going to make the prop shafts come out parallel with the hull. The other things I have planned to move the pivot point forward on the rudder and the motors will be on a mixer. I had planned for a bow thruster know this will be useless when it's moving but it might come in handy, it's just how the outlets will be hidden.
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