The Ship Model Forum

Just received my Iron Shipwrights Sierra II today. Hefty chunk of resin!
What was your question?

Anyone else pick up Iron Shipwrights new Sierra I/II kits? I have some questions about hull shape/cross section. Will post pictures later.

[quote="Woodstock74"]Am I correct to think that the small maneuvering propellers the Russians use are "variable" geometry? That is, they can be planed/rotated for use, and they rotated so the blades are parrallel to travel direction (and lower drag)?[/quote]

There is a photo of the Komsomolets wreck that shows one of the secondary propulsion motors (note these are essentially only for emergency use, like their U.S. and British counterparts):

https://i.imgur.com/Ge0m7OA.jpeg

The blades are rotated to feather as you mentioned, and you can see a circle at the blade root, which is highly suggestive of a controllable pitch propeller.

Jacob

Am I correct to think that the small maneuvering propellers the Russians use are "variable" geometry? That is, they can be planed/rotated for use, and they rotated so the blades are parrallel to travel direction (and lower drag)?

Wow, I'm impressed, that actually looks quite good. I suspect they used these plans, which I believe are quite accurate:

[url]https://i.imgur.com/nDoI73K.png[/url]

Jacob

Takom has released a 1/350 Project 658M (Hotel) SSBN: https://www.1999.co.jp/eng/11135558

[quote="Timmy C"]Here's a close-up of that flag, posted by Capt_Navy on Twitter and credited to Alexandre Meneghini of Reuters. Resembles some kind of Spartan or other Ancient Greek hoplite with a Swordfish on the shield.[/quote]

Good stuff Timmy. That answers that! Thanks.

Not as cool as USS INDIANA's Bad Ass Battle Bass, but still pretty sweet.

Dance

Here's a close-up of that flag, posted by Capt_Navy on Twitter and credited to Alexandre Meneghini of Reuters. Resembles some kind of Spartan or other Ancient Greek hoplite with a Swordfish on the shield.

Russian Nuclear-Powered Submarine Arrives in Cuba:

[url]https://www.themoscowtimes.com/2024/06/12/russian-nuclear-powered-submarine-arrives-in-cuba-a85388[/url]

It's the Yasen Class Submarine Kazan. Wonder what is the black flag / symbol she is displaying on the side of her sail? Re-posted for ease of viewing, copyright rests with original owner:

[attachment=0]AFP__20240612__34WH3EC__v1__HighRes__CubaRussiaWarships.jpg[/attachment]

A dragon perhaps? As that features in the coat of arms of the city of Kazan?

And the Yankee Class screws, which were not skewback and probably emitted a significant "blade rate" low frequency for US sonar detections.

Dave, Mike,
Here are the Oscar propellers photos I have, and are Oscar II.
Oscar I is reported to have (depending on the source) either 4 or 5 blade non-skew screws. Probably similar to the Delta III and Papa 5 blade screws below
These are from Vepr's collection. He would probably answer himself but is busy on his research work.

I appreciate you considering the things I proposed and putting so much work in. Unfortunately pictures of OSCAR I screws are few (and are probably all screencaps from the same movie). I'll keep looking.

Cheers,

Dave

[quote="ssn705"][quote="Woodstock74"]Mikro-Mir doing a Yankee class:

[url]https://www.facebook.com/mikro.mir.dnepr/posts/pfbid0zkCRNofdnpq2UZeRkf9rx9QVwS2eXv9xBuR15BSj9kTgEuLsBXeVxtuSFw9mBpjsl[/url][/quote]

Saw it yesterday. Very exciting. Especially with the hull break that could potentially make STRETCH, SIDECAR and NOTCH more easily possible :)

Planning on doing screws for it (and others I might have mentioned)?

Cheers,

Dave[/quote]

Always a possibility of course. As for the Oscar I and Akula suggestion. The Akula was fairly straight forward but I haven't printed a production level yet, only a handful of prototypes. The Oscar is a pickle and I've been working on it on and off since the summer; without photos to go off of I'm using the Victor screw (the tandem-fixed screw like on the Mike) as a surrogate. And I'm struggling to get anything I like and for now avoiding reevaluating the Mike while I'm at it (but once I crack the Oscar I'll probably look at reworking the Mike).


it is unlike the Mike and more like the Victor but for now I just can't get it to look 'right'. And I'm avoiding reevaluating the Mike, and it'll probably need it once I crack the shape issues I'm running into with the Oscar I. And the shame of it all is that using the Victor screw as a surrogate, there are actually tons of photos from different angles and what I'm running into is a hardstop on my CAD abilities I think, for now.

[quote="Woodstock74"]Mikro-Mir doing a Yankee class:

[url]https://www.facebook.com/mikro.mir.dnepr/posts/pfbid0zkCRNofdnpq2UZeRkf9rx9QVwS2eXv9xBuR15BSj9kTgEuLsBXeVxtuSFw9mBpjsl[/url][/quote]

Saw it yesterday. Very exciting. Especially with the hull break that could potentially make STRETCH, SIDECAR and NOTCH more easily possible :)

Planning on doing screws for it (and others I might have mentioned)?

Cheers,

Dave

Mikro-Mir doing a Yankee class:

[url]https://www.facebook.com/mikro.mir.dnepr/posts/pfbid0zkCRNofdnpq2UZeRkf9rx9QVwS2eXv9xBuR15BSj9kTgEuLsBXeVxtuSFw9mBpjsl[/url]

Another screenshot...

Nice. Thanks Jacob. I love these old movies.

Dave

[quote="ssn705"]Anyone happen to have a picture of OSCAR I with the early tandem screws.

Dave[/quote]

Dave,

See this 1983 Soviet film about Project 949:

https://www.youtube.com/watch?v=Fk29x3u928o

The propellers are at 5:10.

Jacob

Anyone happen to have a picture of OSCAR I with the early tandem screws.

Dave