Building the french suffren sna

[Subculture]

Why have you got a pair of cardan joints either side of a telescoping CV shaft?

[rwtdiver]

Rough printing (not final product) of feasibility test and functional check for new swivel Suffern Pump jet. Internal control rod for actuating as a rudder. For this to Swivel it was accepted it had to become a Post swirl arrangement for this to function. 8 post swirl stators and 15 impellor blades. I had number of impellor blades reduced from 18 originally to 15 (odd number). (too much 'prop area').

The Propulsor and the shroud move as one unit. Only swivels left or right + or - 25 degrees (ample) . To facilitate the prop shaft needing mechanically able to extend and shorten as the PJ swivels I will employ a HR CVD110T25 Lightweight CV splined drive shaft barrowed from RC off road car parts Off the shelf and already water proof. the drive shaft lengthening or shortening from 110 -125 mm.

This should transform the 'lamp shade' from a lability to an asset. Do the real ones do this? IDK. I just know it is hoped mine will.

Steve,

Your pump jet concept is very interesting for sure!

Looking forward to how it actually works...

Rob
"Firemen can stand the heat."

[Albacore 569]

Why have you got a pair of cardan joints either side of a telescoping CV shaft?

These will probably be eliminated as unnecessary. I decided I didn't need after I drew up the illustration a while ago. I was wondering if anyone cared or noticed...you win a cookie! lol.

The turning ability should be dramatically improved.

How ever I think a lot maybe about factoring in the boats center of gravity/buoyancy too.

I was prompted when at the ideal for running San Fransico Sub Regatta where a friend brought his beautiful Astute class HMS Artful in 1/72 scale. He complained it turned like a pig, even after making and adding a transparent slipper addition to the rudder below on the cruciform stern.

At the same time interestingly Bb Martin has a video of his Trafalgar class with a pump et in 1/64 too (same cale as my future Suffern).. That model Bob demonstrated had excellent turning in the pond surfaced and submerged. The models are of similar size / shapes in their hulls and surface area for their rudder's stern planes too.

The vectoring pump jet was an idea I wanted to test out. But Bob's Trafalgar suggests a lot about turning ability maybe more about the center o gravity, the rudder area, combined importantly the length of the rudder's moment arm from the boats center of gravity / buoyancy, despite the big 'lamp shade' on the back.

[EmbersOfSuns]

Much has been happening quietly. I have decided to purchase a large table resin 3 d printer. Well large enough for any project I can imagine and still fit in my car trunk The tariffs and to save cost made sense to just print my own from STL files myself, avoiding middleman and Canada and Chinese Tariffs. The design work in Canada, but trump can tariff me if the files are acquired over the border over the internet.

Retired, I sold out some points frm years designing in a virtual world and was able to cash out $800.00 that paid for the printer. Grateful to my middleman in previous projects, but it's time to leave the nest.

This way made sense, and I kept thinking oh just one more project...lol then it would cost less, and I can build future projects and maybe print for others too - recouping my investment also to some extent. The STL files for Suffern have been done a few weeks and will start attempting to use the printer and press forward.

The STL files by Randy Sanders are breath taking and accurate as far as we can tell by both of us working together from public sources.

The French have developed an excellent somewhat smaller than a Virginia and Astute attack boat, with sonar that maybe the best in the world. (according to one American independent source). The pump jet is designed for this model works well in its 'functionality requested'.

New research is always done, and here is a new illustration from You tube video that confirms my earlier research and sharing here. More to come of course. Glad its accurate as my masts have been already completed! LOL.

The illustration also confirms the aluminum masts on my model with the airfoil shape reversed is correct. Those French!

Hey! That's one of my illustrations lol. Just curious, what youtube video did you find it in?

[Albacore 569]

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.

[Albacore 569]

Slowly by trial and error learning to 3 d print the Suffren parts. Tech support really sucks, and you tube videos are worse. 'Oh, it's so easy!' **** them. The issue now is exposure times. The manufacturers seem all way off. Seems 3 d printing is as much an art as it is a science. I was hoping more on science. Local Freind and sub builder Jeff Apts is being of great assistance. we are dialing it in.

On test rudder 3 , managed t print 2 of 4 rudders sliced. At least after 3 months got some indication the printer and slicer program actually works. Before this total darkness. It's a start.

[neitosub]

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

Nate

[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.
.

[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.

[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.

[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.

[EmbersOfSuns]

Also, great looking work so far!

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

[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.

[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

[gantu]

Here some more.....