Building the french suffren sna

[Albacore 569]

Refining th stern controls. This is not posted with the intent of this is 'the expert way' hardly, but more the attitude of 'will this work well you think?'. Any thoughts how it can be improved? If you may or may not notice, the four identical stern planes will operate up and down only! The pivoting pump jet shroud and prop (and prop shaft) pivots side to side and will function as the sub's rudder & vectored thrust.

The twisted brass sheet connecting (and separating) the two diagonal rod cranks are connected at the bottom and will slide forward & back a short distance for up and down forces on the planes.

The two big elbow bends allow the flexible prop shaft coupling to swing back and forth clear to swing fully to left and right.

[Albacore 569]

Adding the stern plane posts with the micro size U joints.

[Albacore 569]

Waiting weeks for critical parts. No one in USA makes only China. As with the 3d printer parts earlier. Always stuck in LAX cargo customs. LAX customs must be hanging out with the Mob .lol. Latest now says arriving Wed the 21st. January. Ordered in advance in assembly plan on December 28th, 2025. Tariffs again. Always a hassle. The Bambu Labs Company who makes these, I selected because they are the smallest. Space critical areas. Bambu Labs has been very nice and sent a second set free. One or the other or both will arrive someday. Continuing to build around the wait

On the Suffren class subs the sexy stern planes sweep back. So hence the need for the universal joints

It reminds me a little of the USN Escort destroyer classes in WW2. They needed mass production of DE's rapidly, Diesels, turbines, gear reduction production availability avoiding shortages determined the many different classes. The Buckley class used Turbo electric drives as there was a shortage of diesels that submarine production had 1st priority too.

The Evarts class used diesels when the Fairbanks Morse diesels crunch loosened up later - able to expand production to cover needs and Turbines then came into shortages because of demands all over the fleet. Turbo and diesel electrics on the DEs didn't need the delicate gear reduction sets, the turbines or diesels all ran at a constant optimum speed and provided generator electricity for the electric motors driving the shafts.

We can thank the prewar American Locomotive industry for the Fairbanks Morse 39 9-1/8 diesel engines.

oh well....as I wrote - continuing to build around the wait

Parodical U Joints - arrived today - for time gage about 23 days from initial order online to in hand. Jacket on its back to the shop! :)

[wlambing]

FM 38D 8-1/8 engine built for railroads, submarines, tugboats, you-name-it! The direct reversing version was 38 ND8-1/8. Neat engines, still serving in our submarine force today!

[Albacore 569]

Waiting weeks for critical parts. No one in USA makes only China. As with the 3d printer parts earlier. Always stuck in LAX cargo customs. LAX customs must be hanging out with the Mob .lol. Latest now says arriving Wed the 21st. January. Ordered in advance in assembly plan on December 28th, 2025. Tariffs again. Always a hassle. The Bambu Labs Company who makes these, I selected because they are the smallest. Space critical areas. Bambu Labs has been very nice and sent a second set free. One or the other or both will arrive someday. Continuing to build around the wait

On the Suffren class subs the sexy stern planes sweep back. So hence the need for the universal joints

It reminds me a little of the USN Escort destroyer classes in WW2. They needed mass production of DE's rapidly, Diesels, turbines, gear reduction production availability avoiding shortages determined the many different classes. The Buckley class used Turbo electric drives as there was a shortage of diesels that submarine production had 1st priority too.

The Evarts class used diesels when the Fairbanks Morse diesels crunch loosened up later - able to expand production to cover needs and Turbines then came into shortages because of demands all over the fleet. Turbo and diesel electrics on the DEs didn't need the delicate gear reduction sets, the turbines or diesels all ran at a constant optimum speed and provided generator electricity for the electric motors driving the shafts.

We can thank the prewar American Locomotive industry for the Fairbanks Morse 39 9-1/8 diesel engines.

oh well....as I wrote - continuing to build around the wait

[Albacore 569]

French DDS done, back to rest of the boat as it is progressing quickly now.

DDS and rest of the Suffern model decided will be in a two-tone black.

Tamiya PS-5 semigloss black & Tamiya TS-82 Flat black Rubber. The DDS skirt flat black Rubber (anti-echoic coatings) and Suffern herself below surface trim waterline and anti-skid on casing deck PS-5 semigloss black & Suffern casing, Sail, Rudder-vators, Pump jet shroud Tamiya TS-82 Flat black Rubber. Interior of Pump jet Tamiya PS-5 semigloss black. The propulsor is a Rust-Oleum Metallic Gloss Champagne (appropriate name lol) Bronze.

Dry transfers have been printed for when that time comes are in a light gray shade (never bright white) so they don't 'head light' contrasting too strong visually. Then overall the whole boat will be coated with a Tamiya TS-80 flat clear. The message buoy on casing aft of sail trailing edge a brilliant (will be flattened) red Tamiya.TS-86. I will add a little feathering. My policy preference is light hull feathering. The boats are new, the pride of the Marine Nationale and France, so ....no filthy rusty fork Russian look.

[Albacore 569]

The final thick-walled DDS done. Nautilus Dry docks magnets delivered today & inserted. They fit snug & a drop of CA glue secures them in DDS foundations designed in. I add the magnet to other when inserting magnet from its control rod plastic mount into frame assuring magnetic poles are oriented correctly. I will paint black tomorrow morning and mask the anti-echoic skirt a slightly off black (a Testors rubber black). I wanted to take these photos while still in primer gray, so details are clearer.

[Akula54]

The Suffren herself is so darn sleek

.

I agree, one of my favorite french sub after Inflexible class ;)

[Albacore 569]

Printing it up. The DDS is thin; I am making a thicker walled version. The black 'landing tracked platform' (my term not sure of its correct name) for landing the French SWUV was made in the morning while the printer did its thing.

Made it the old-fashioned way using scrap printed resin parts, a disk sander, some brass tubing, Bondo and my hand piece with some added sheet styrene. It is hollow and free flooding too, both will be secured on deck eventually with some Magnets from Bob Martin's Nautilus works.

Comparing the French DDS to the American DDS, the US Navy doesn't seem to need a landing platform, the divers open the hatch and pullout a telescoping track on wheeled legs. But maybe the French one has more than it shows. Suspect the French DDS has telescoping tracks too still but connecting the landing platform to roll the SWUV in and out of the shelter..

The Suffren herself is so darn sleek, the DDS is a startling visual contrast that visually gives the model a sense of proportion and scale. The DDS will not be a standard item on the model, but a cool accessory once in a while at the pond. The French DDS around its skirt (the flat sided areas) contain anti echoic panels like the rest of the boat does.


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[Albacore 569]

Drafting by Randy Sanders for new French DDS for Suffren class. Printing now

[Albacore 569]

While DDS design finishes, completing the Suffern's swiveling pump jet. In the middle side view of propulsor with its stainless steel 4 mm shaft, this is more a reference photo for me so I can remember if I ever do maintenance I can reinstall the correct number of bearings and washer spacers. The large disk (washer) buts up against the stern and acts as a discrete pivoting thrust block. Simple, works great. Added a hole along bottom centerline to insert an Allen wrench to easily tighten prop to shaft.

To remove or attach, use allen wrench to pull the threaded allen pins from the rudder posts, detach the flexible coupling from the drive shaft, slide the shroud and prop off stern. Insert allen wrench loosen prop on shaft...gently slide the shaft partially out leaving a 1/4 inch extending like in photo, pull out shaft that extends into the tail cone. Tip the prop to remove around the lower rudder post. Reverse steps tio replace.

How the real pump jet actually really looks is unknown and don't care to know thank you very much. lol. I decided on 12 turning blades It probably has a primary number blade count likely on the real ones. Made blade tip clearances minimal. We are using a post swirl design instead of a pre Swirl design which the fixed stators are in front of the propulsor - like all known existing PJs around the world. (the Mk 48 Torpedo uses a post swirl). However, the pre swirl is excellent for facilitating the swivel function I desired and is simple and sturdy. In the water, It will still looks scale nuff.. Now the shroud doesn't restrain model turning but the reverse greatly enhancing it. Bob Martin has since made his own design with a swiveling PJ accessory for his 1/72 scale Virginia kits

[Albacore 569]

The French DDS for Suffern Class SSN (SNA) design progressing. Almost done.

[Albacore 569]

Printed a pair overnight, using my 'easy bake oven' produced these this morning - print time 8 hours 13 minutes. These printers never cease to amaze me. Looks like they need sanding? Nope! They will get their final UV sun bath as soon as the sun comes up.

All these propulsor evolutions have a hole for a hex locking nut. I will make a tiny discrete hole in the shroud along its bottom out of view for slim hex wrench. Will drill hole once propulsor final positioning finalized.

[Albacore 569]

I can't wait for the files to be available, this model is awesome !
(And I have an OTW WTC wich fit perfectly... )

I am using a OTW Dive module 3.5 inch also. Yes to JHapprich - Must be French Steam punk!

[Akula54]

I can't wait for the files to be available, this model is awesome !
(And I have an OTW WTC wich fit perfectly... )