New project - USS Nautilus

Hi Andeas,

What sort of brushless motors do you intend to use?

I say this because one of the things that seems to limit their use in submarines is:

- tend to be very high revving (gearboxes!!?)
- too many to choose from.

I asked a similar question to the Sonar members at the Dortmund show and they said that they tend to have them specially wound.

Are there easily commercially available brushless motors which would do the job?

For example, how about this one :

3508-380KV Turnigy Multistar 14 Pole Brushless Multi-Rotor Motor With Extra Long Leads

http://www.hobbyking.com/hobbyking/store/__41615__3508_380KV_Turnigy_Multistar_14_Pole_Brushless_Multi_Rotor_Motor_With_Extra_Long_Leads.htmlCUR=GBP&LOC=GB&LAN=ENG&gclid=CIi5u7PBwMECFabLtAodhx0AhA

I have never used a brushless in a submarine yet but this looks compact and low revving because it is multi pole.

David

ROXXY© BL-Outr. C35-30-45 300kv

or

ROXXY® BL-Outr. C35-29 500kv

The 35-29 ones are driving my U-1

Thanks for the information, Andreas.

So that it is a 14 pole motor which will be doing only 3000rpm at 10v.

Also very small - I am beginning to see the attractions of brushless!

David

http://www.robbe.de/roxxy-bl-outr-c35-30-45-300kv.html

It's all about the size. Also my self-designed water-tight feed through saves allot of space in the interior of the wtc, as it moves the motor right to the stern bulkhead. The complete length of the wtc with a 750 ml Engel piston tank is only about 60 cm.

The CAD files for the milling of the moulds are getting ready:

Small stuff has to be designed as well......e.g. hatches:

While waiting for the first milled pre forms for the fuselage, I spent some time drawing details:

Starts to look like a boat......the small stuff takes extremely long to draw

Just got a package......:D

Propeller design....

Very nice Andreas!

The future - we'll just download a CAD/CAM file?

From our previous discussions, the only remaining problem seems to be the cost and availabilty of the fabrication stage?

David

BTW Andreas - I see that you are still a Guest. You can join the AMS now. Just click the link and it's free.

CAD/CAM definitely expands the possibilities allot. I'm tempted to get the props 3D printen in titanium. Just some polishing and then some proper moulds. Would also be a good route for the mast pre forms.

What do you mean with guest? I'm a registered forum user.....

Cheers Andreas

You are indeed!

Thanks,

David

Worked a bit more on the props. Added a real Profile to tha blades and reworked the radius blends. Now I have to figure, if I get them printed in metal or plastic.

That's about how I envision the upper part of the sail....

A glance into the living resin & glass fiber hell.......

More concept work.....this time the anchor:

Original:
https://c1.staticflickr.com/3/2549/3953530408_1ebf3b2d4f_z.jpg

CAD:

And on the boat.....

Dr.Schmidt wrote:A glance into the living resin & glass fiber hell.......

I have not worked with fiberglass, is that sand being used? Can you tell me what is happening in this photo?
Thank you!

The procedure to make my moulds is as follows:

You put your pre-form into the sepeartion plane ( if necessary) and then you build these wooden boxes around the pre form. In my case I used plastic coated chipboard for the boxes. Everything is then covered sereveral times with a mould release wax. Then I apply the top coat, wich is a metal filled mould gelcoat (everything blue in the picture a remanents of the gelcoat). Then you let the mould gelcoat set. Next, one laminates about 3 mm of glassfiber into the mould box and fills it with what you called sand (which is pretty close). The sand actually is made of about 2 mm large glass spheres. It's a cheap product called Proaver http://www.poraver.com/en/. It easily mixes with resin, does not need to much of it and then solidifies to a block that can easily be sanded but can take the perssure of screw clamps. Finally you sand the proaver to a flat plane and seal the mould again with about 3 mm of glass fiber. This way you get a closed box wich is very stiff, easy to clean and will stay straight, evene when clamped together.

First tool done....upper half of the bow:

More mould making mayhem

bow - lower half:


bow complete:


deck - main mould:

The last milled pre-forms. The conning tower....



And the rudders:

That's the current status of the design....

Right in time for Christmas I got a big package full of 3D-printed parts:

Propellers - turned out really good, even the profiles. Excellent for only 28 mm diameter.




Stern bulkhead - notice the 7° kink for the tilted prop axis:



deck hatches:


Sail cover, bridge, mast housing and small parts like periscopes:








That's going to be plenty of work to make moulds for all these parts.....