VIIC 1:45 modell

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hds
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Re: VIIC 1:45 modell

Postby hds » Tue Apr 09, 2019 9:32 am

Just a short note on epoxying the nylon hull. You would want to support the nylons by a layer of paper or similar with a closed surface. Squeeze out the extra resin with a soft scraper (balsa or such).

Otherwise you put too much resin on and it will not fill all the small gaps in the nylon. Other than that the hull worked out as planned. Some cleanup needs to be done now and the openings for the cutout inlets.

Update:
One large step for hds shipwreckers co., one small pic for the forum, presenting: The Hull(k) ... amazing what they do with underpants these days ...
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hds
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Re: VIIC 1:45 modell

Postby hds » Thu Apr 11, 2019 3:47 pm

Aft section with inlet build in. What is really cool is that the opening of the aft inlet do fall in line with the frames of the hull. Same should happen for the front body section. Adds some visual spice for close up looking.
First sketch of the deck loosely attached to clarify sectioning and fix points. When you followed me with your own sub project you should have now something similar ...
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hds
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Re: VIIC 1:45 modell

Postby hds » Fri Apr 12, 2019 6:27 pm

Sharky shows its teeth ... on to the technical stuff. Hull will be beautified when everything else is in working conditions. Deck drawing for laser finished. Not sure which material to take. Maybe 1mm Balsa so i can encarve the planks and so on.
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hds
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Re: VIIC 1:45 modell

Postby hds » Tue Apr 16, 2019 7:31 pm

Deck Layout (Directors Cut). First test sheets, on the right, resined and ok. Material will be 1mm Finnboard. But i do have to re-tyre my laser cutter. We do have a disagreement about "linear" or "straight". If that won't help i need to design me own one with linear bearings and stuff (but boy am i in the mood to do this ... :roll: )
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hds
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Re: VIIC 1:45 modell

Postby hds » Sun Apr 21, 2019 1:32 pm

Conning tower platform cut from DIY plywood. May be the matrial to go also for the deck.
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hds
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Re: VIIC 1:45 modell

Postby hds » Tue May 07, 2019 1:32 pm

Deck and canon tower with some details for eye candy. Materials used: finnboard, drawing board, DIY birch plywood (1.8mm), 0.6mm beech veneer, brass tube and wire, alu tube, electronic solder, resin, watertight glue. Finish will be matt clear paint. No coloring intended.
Pls note the latest swiss made "maimer pro(tm)" with seven free shots and extended warranty for 3 years trouble free maiming.
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bill
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Re: VIIC 1:45 modell

Postby bill » Mon May 13, 2019 2:01 pm

Rail detail; very nice touch! :D
reox
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Re: VIIC 1:45 modell

Postby reox » Tue May 14, 2019 8:25 am

yes, the railing looks really good! Nice soldering as well as the added wood details.

I also like the hole pattern of the deck. How long does it take in your lasercutter?
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hds
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Re: VIIC 1:45 modell

Postby hds » Fri May 17, 2019 4:27 pm

Deck cutting took about 4.5hours overall for 1mm finnboard.
You might want to add max 10% spirit (ethyl alcohol; "Spiritus") to your resin.
This ensures that the resin will not harden rock solid.
The deck will be held in place by neodyn magnets.

15W Laser: Speed 500mm/min , 2 passes, Light intensity 600 (i know that there are different values on the internet. but mine runs in analog mode so may be the PWM is calculated a bit differently. i guess it is approx 25-35% duty cycle).

Sharky got its face mask. Pickles will be added later.
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The conning tower now. Main periscope takes the routing pipe for the antenna.
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hds
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Re: VIIC 1:45 modell

Postby hds » Wed May 22, 2019 12:30 pm

Center of masses with a lightly patched macro of shupins main work. The purple sphere indicates the "wanted" COM and the red one the actual COM with motors, batteries etc installed. The distance is approx 65mm aft. The overall weight should be around 3kg (theoretically).
According to FreeCAD and the COM macro i get 1.5211 kg (Frames plus Stringers plus aluminium bars). The actual weight is 1.5445 kg. So a net 20gr difference for the hull i.e. the nylons with resin. That is a bit to low but i estimated the density of finnboard+resin to 1.25 which of course varies a bit from day to day.
So all in all it is not a heavy lady and the estimation of figures where quite right.

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Here i changed the COM macro to size the spheres according to the mass. That is very handy cause it indicates that the main contributors do have their COM around the center of the ship where they belong plus because of that only very little rudder action is needed to go up and down.
Get ready for shoulder clapping and tin medals reception ...

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