Building the french suffren sna

[Albacore 569]

I've never considered such a linkage to make a traditional type yoke work two opposed, skewed operating shafts in unison. Well done, sir. I'll steal this arrangement some day.

Thanks David. Steal away if it will work in a particular situation. I wanted a reality check (Big Thanks) to see if I was doing tin a coherent way solving the engineering problem or I was ful of ****..lol

[He Who Shall Not Be Named]

Thanks David. Steal away if it will work in a particular situation. I wanted a reality check (Big Thanks) to see if I was doing tin a coherent way solving the engineering problem or I was ful of ****..lol

Hey!... every good solution is usually preceded by an array of bat-**** stupid 'solutions' that failed to pan out in the real world.

Here's a variance on your 'universal' fittings between the yoke stems and operating shafts: Substitute the traditional universal joint with a short length of stiff flexible tube. The tube has next to zero radial back-lash, yet flexes between two skewed shafts during rotation.

[redboat219]

1/72 Suffren

[Albacore 569]

Cool...lol Back to the salt mines continuing to build. Nice clean design that attracted me to this modeling subject too.

The stern planes are wrong, but I am sure it was to increase surface area t compensate for the fixed pump jet shroud.

The French kit is 54 inches long; my 1/64 model is 61.25". Roomier but fine. I hope to have mine in the water by late spring,

In another you tube, he has made a DDS (dry Deck shelter) too...lol

Thanks for sharing.

[redboat219]

The stern planes are wrong, but I am sure it was to increase surface area t compensate for the fixed pump jet shroud. The French kit is 54 inches long; my 1/64 model is 61.25". Roomier but fine. I hope to have mine in the water by late spring, I hope. In another you tube, he has made a DDS (dry Deck shelter) too...lol

Thanks for sharing.

note that he doesn't use U-joint for the swept stern planes.

DDS

[JHapprich]

Sexy Soviet 6-bladers, David! Wish i had two of those for the Vodka short can! Do you still posses the Foxtrot?

Albacore, is the DDS a standard on the Suffrens?
you got your milling gear yet?

Jörg

[He Who Shall Not Be Named]

Sexy Soviet 6-bladers, David! Wish i had two of those for the Vodka short can! Do you still posses the Foxtrot?

Albacore, is the DDS a standard on the Suffrens?
you got your milling gear yet?

Jörg

Yup. Will paint and weather it one of these days.

[Albacore 569]

A Foxtrot is the only Soviet sub subject I'd be tempted to ever build. Important sub in the cold war. Beautiful looking too, the Soviet rendering of the German Type XX!
Davids model looks wow!

The French DDS on the Suffern is just one of its primary 'mission accessory's' I expect. Not for it's normal hunter killer operations. The French attack boats are primarily for protecting the French Le Triumphant SSBNs nuclear deterrent along with screening French surface battle groups & special missions too.

The French submarine service uses two crews on their attack boats too like our SSBNs for max utilization at sea.

The French DDS is like the American 688s/Virginia/Ohio's using the American DDS. But on the first 4 converted Ohio's the DDS are more standard of course as the Americans can deploy these for dedicated littoral missions along with their enormous battery of Tomahawk cruise missiles, with more space for trhe SEAL teams too.

The French DDS looks different from the American DDS but expect it functions much the same. It's a little cleaner in streamlining, and shapes. The French seem to carry a landing pad (?) aft of their DDS, while on the American DDS use an extendable track that rolls out to land the divers vehicles on.

The Rubis class are suppose to be able to use their DDS too, two Rubis class remain at present in operation & will be succeeded by the new Suffern's by 2028.

The Rubis class are the smallest nuclear-powered combatant SSNs. They were / are understandably cramped & crowded. The Rubis use a turbo electric drive, I guess you could consider them somewhat a faster American 'Tullibee'? Six 'roach hotels'..lol? They have served well though.

The Suffern's designers all must have gotten the message; the Suffern's are double the size and have half the crew size of the Rubis boats. Automation doesn't need food, a SSNs only real limit in patrol endurance The Suffern's are also the first SSNs designed for mixed gender crews.

[Das Boot]

I can’t say as I’ve ever run an X Tail. Can you tell a big difference between this and a regular vertical and horizontal set up?

[Albacore 569]

I can’t say as I’ve ever run an X Tail. Can you tell a big difference between this and a regular vertical and horizontal set up?

I am not really doing a X stern in function in actuality. So don't use as a typical X Stern control set up. This set up externally will be a X stern - is true, but because my Suffern model will employ a unique experimental pivoting pump jet, this stern plane arrangement here is in function being used only as a horizontal stern plane. All four surfaces will move in unison up and down only. No 'mixer' will be needed in this case. It's a radical solution to enhance pump jet models turning ability in the pond I wanted to try out.

[Albacore 569]

How to CA glue the X stern rudders after careful alignment first without mucking up glueing everything solid?

Painted black first the gap between the fixed and moveable X stern surfaces. But more so, the black shows minor
surface imperfections better.

Once the stern sub-assembly is done & tested, it will be attached to the submarine's stern and puttied, sanded / painted.

The glue injection passage on the stern plane wing tips then will be puttied over & sanded closed completing the 'surgery'.

Stared at these parts a long time watching my favorite show at dinner time (Star Trek TNG) first before figuring something out.
Glad I used brass tubing instead of solid rod this time.

[Albacore 569]

More work- the pump jet swivel finished (solid & smooth) stern planes in,

[Albacore 569]

Update: I've been in shop doing overly too much thinking on my X stern arrangement. Tried three or four different ways to facilitate the same thing. All worked but some cleaner and easier than others. I think I have it all dialed in now exactly what I like. Since the Pump Jet pivots side to side it handles the rudder functions with its shape and thrust vectoring. The stern planes in my arrangement because of the swivel jet only needs to move together creating up and down forces

Final arrangement will have one servo arm instead of two (as seen below). Two magnets now will click securely the two cross arms together, one magnet each on each cross arm. In an earlier version a connecting rod was used connecting the two cross arms, but it caused too much binding and alignment issues.

But drilling a whole into two magnets & slipping each magnet down the rod connecting that way will make the system run smooth and easy. The magnets are smooth & cylinder shaped so they stay connected but roll against each other with little to no friction maintaining a precise connection and spacing between.

In the back on pump jet shaft is a thin wide washer. It acts as a spacer, so the prop blades don't have any 'slop' fore and aft, and acts as a floating swinging side to side thrust block.