Building the french suffren sna

[Subculture]

I'm not Bob Martin, I'm Andy.

This was a quick and dirty filament print I did for my best guess of a Vanguard propulsor.

[Albacore 569]

Yes Bob. Randy Sander's guess.

I asked Randy to reduce the number of blades from 18 to 15. If you Subculture are bob Martin? Randy remembered feedback from Bob Martin that 18 bladed was too many blades for the water, and that 15 worked better. I requested the number of blades be a odd number. The only 'more definitive' information is a drawing given to me ages ago by hand of a Trafalgar class pump jet general illustration. The blade shapes are different. - broader chord at the base which makes scientific good sense rotational speeds are faster at the tips if the goal is a uniformity of thrust flow along with blade twist. One important thing is making the clearance at the blade tips with the shroud as close a possible with free model prop movement. one EB worker retired now said the clearance on the real pump jet was only a Pencil width.

There is a point though where it is best to blur what a real PJ on a model might look like - for the sake of security and the crews on the subs. So I am happy just with a 'Guess'. as long as it represents the model fine and it operates in the pond water well.

My question is now what color to paint it? The default may be to paint it a gold bronze. But are they? I read in 21st century submarine design they were thinking of Carbon composite blades for pump jets. So do I paint them a gloss black?

Below is one influential image in my considerations what a guess might be.

[Subculture]

I’m going to speculate that the prop shape is a best guess, is there a reason for the overlap of the blades?

[Albacore 569]

New Suffren impeller. Resin takes primer paint well...balances great, crisp printing. 4 months frustration then dare I say it's finally working?..lol 15 blades right-handed prop. Diameter 6 CM. 1/64 scale model

[Albacore 569]

Two in a row? Maybe the FEP now matt side up fixed the issue

[Albacore 569]

Gradually agonizingly beginning to make successful part prints from Printer. This morning, the new rudder shapes all printed, sliced 8 on plate with only 1 having a small deformity. was sliced in different angles to experiment to see if some angles are better than others. Will try again with other small parts now. Bow planes and bow plane door cover openings next. Parts now getting their UV sun tans (45 minutes).

Maybe I can make that bomb bounce on the water like a ping pong ball after all?

[Albacore 569]

New revised rudder form.

[gantu]

Here some more.....

[Albacore 569]

Break through success finally. Proceeding with other parts. The rudder shapes I'm aware of and adjusting. Easy fix sanding. I will later after I see how the whole model looks. Thank you

[Albacore 569]

Also, great looking work so far!

Here's a better quality version of that image, even if you've completed the masts...

Thank you Embers, I appreciate it. I am sure you noticed too, th streamline fairings foil shapes are reverse on he Suffren. Interesting. The French seems t think there is less wake oriented that way?

Still struggling with the damn printer. Successful RERF exposure test. then took the best sample and loaded those exposure settings and it failed for 5th time. Ready to give up.

Wonderful stl files ready, slicer ready. Printer seems to wrk. But.........doesnt produce anything useful...5 piles if useless resin flash slicer parts.

[EmbersOfSuns]

Also, great looking work so far!

Here's a better quality version of that image, even if you've completed the masts...

[EmbersOfSuns]

Pleased to meet you. I hope it's ok to use. It is valuable for my model building. I'm happy to give you credit if I knew you. but I didn't.
it was from this YouTube video . at about15:57 minutes in (about). public source

The commentator (a sub vet) seemed to be very impressed with the Suffern's too, Esp. the (sonar suite).

Dp you have anything like plans drawings of the USS Halibut SSGN 587?

It is suspected now that the Suffren class & Virginia class and sure likely others now have a form of anti-aircraft ASW helicopter anti drone weapon capability using a laser weapon fired from one of the masts.

Good to meet you! It sounds like Aaron gave me credit in that video, so no worries.

I do not have anything for the Halibut since I've been focusing on current boats, but I can look into making a mast/sail illustration for you!

I've heard of periscope/mast mounted lasers in concept but haven't seen anything to suggest that one has been fielded or tested yet. Let me know if you find out though.

[Subculture]

With any new resin printer and with any change of resin (type and manufacturer) it’s necessary to run a calibration print to check the correct exposure times for the best results. You usually only need to run two or three of these before you have the right settings dialled in on your slicer.

With regards to the Asute or any sub, distribution of mass near the boats centre of pressure- dictated by the original design and generally near the longitudinal centre point- will make it more agile. Just like a sports car with a mid-engine layout is more sensitive to steering inputs than one with the engine located at the front or the rear. The trade off is it can make the boat more sensitive to control inputs, both in pitch and yaw e.g. twitchy. Packaging of components also poses limits to how far you can go with this, although modellers tend to get a lot more flexibility than the designers of the 1:1 scale versions. With the size of today’s components and especially batteries, it’s much easier to locate the heavy bits near the boats mid section than it was in the past when big bulky SLA’s were the state of the art.

Early Eden/Sheerline Trafalgar class kits used a big old SLA battery housed near the bow, whereas later kits used NimH pack located in the middle slung underneath the cylinder. Coupled with a reduction in thickness of the upper hull, these two simple modifications greatly improved agility and stability of the model by redistributing mass lower and in the centre.

[Akula54]

Is the change in the shape of the control surfaces intended to improve the model's maneuverability?
The chord seems to be constant, although narrow, in this photo.

[Albacore 569]

Which 3D software are you using to create the control surfaces? Usually resin prints should be pretty dimensionally accurate.

Nate

Using a ANYCUBIC Resin 3D Printer, Photon M3 Max SLA LCD UV Resin Printer
& ANYCUBIC 3D Printer Resin, Upgraded 8K Standard Resin V2.
Slicer is Lychee free program.

Rerunning rudder test 4 now.
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