Japanese 1/16 scale A Class midget submarine build.

[bwi 971]

David, If your were back in school on the AMS you just knocked me back to kindergarten sir.
I'm getting flashbacks from the cabal reports.
I recently tested my prop and I noted that more thrust is generated in reversed than in fwd mode…maybe this is normal maybe not, I haven't got a clue.
Pitch: 36mm
Dia: 43mm
Boss dia: 10mm
Blade area 70% (incl: boss)

[MFR1964]

One step at the time David, first roaming the net for more info, and visit the copyshop, i must be barking mad to start up a new project.

Manfred.

[He Who Shall Not Be Named]

Thanks David,

Those pics from Gene are archived for the future, one day i have to build such a box for myself.

Like i expected, building propellors is a craft which i don't master, but it's still very interesting to see how it works, especially how the fysics work.

You know i want to build that tower, detailnut i'm, all the info is welcome, like Von you send me the drawing, next weekend it's copyshop time.

Manfred.

Your work is always scary-good. Can't wait to see what you do with it. Go get 'em!

M

[MFR1964]

Thanks David,

Those pics from Gene are archived for the future, one day i have to build such a box for myself.

Like i expected, building propellors is a craft which i don't master, but it's still very interesting to see how it works, especially how the fysics work.

You know i want to build that tower, detailnut i'm, all the info is welcome, like Von you send me the drawing, next weekend it's copyshop time.

Manfred.

[Von Hilde]

I received the drawings yesterday. Great stuff Dave, Thanks. I still think the Ha 8 is the most accurate representation of the aft section completly intact, with the entire prop guard cage, of the type A's The designation of Ha 8 is rather foggy since most of the Ha number series carried a designation prefix of the I boats that launched them. The only 3 that were designated with the Ha prefix were 1, and 2 which were the original "Target" boats, under the guise of being a harmless target craft. I think the only reason Ha 19s number was known is because of capture of the skipper alive. The rest of the ones they captured, the numbres went down with the ship and the records went up in smoke during the firebombings of the boat yards and the records thar went poof in the IJN Naval Records in Heroshima. One of the Pearl Harbor boats I-18 tou was raised in 1960 in the Keehi lagoon at the entrance to the harbor, where it was sank after depth charging on the morning of Dec 7th. They found the crew remains and 2 unfired torpedos. The bow section was immediately removed with the live ordinance intact and resank for safety sake and then used as landfill for the runway, The remains and the rest of the sub was returned to Japan. It sits in the Japanese Naval Acadamy on Eta shima , near Nagasaki. Its a little rough around the edges for good details.hefty looking net cutters, possiblly fabbed post 1960 from old drawings.1960 after raising

[He Who Shall Not Be Named]

I try to keep it japanese, otherwise this thread will be fauled with other stuff.

Some more detailed pics about Gene's propellorspinning wonderbox used on his sub, got to know!!!

How exactly do you determen the shape of the propellorblades, i mean the angle and the curve?

And more pics about the tower of the japanese sub (you know why), wether Original from real live or models, i don't mind, the more the better.


Manfred.

Here are all the shots I have of Gene's incredible counter-rotating shaft gear-box.

Propeller blade shape is dictated by design -- as most of my r/c submarines are scale models (representing a prototype), propeller shape, pitch, and blade area are already worked out for me. 'Angle' is variable along the span of the blade. As each radius point along the span of the blade travels at an ever increasing speed as you move outboard along the blade, the blade is given a helical twist that insures each radius point travels the same distance along the axis with each revolution in respect to the other points along the blades span.

This helical twist of the blade is worked out in a simple blade chart.

Not too often the case, but here is a project where I had access to the actual propeller fabrication drawings. What a joy!

But, too often the 'shape' of the blade has to be derived from photos and basic two-view drawings -- the tough part is estimating the actual blade cord from the apparent blade cord. In drafting-crafting terms the apparent cord is a projected view and is false to reality (thank you, binocular vision and helical twist!); actual blade cord is the developed view and is the actual two-dimensional representation of the cord at any point along the blades span. Note the two-dimensional drawing I produced here of the projected and developed views of the propellers face.

A propeller blade blank is prepared (my ill-spent youth in competitive free-flight Unlimited Rubber served me well here). The blade chart is used to determine the 'twist' that will be cut into it as the blade takes form under my rotary sander knives and files.

[Albion]

We dived the Sanko Maru, and also the sub which was scuttled nearlby. The same trip there was a also a Judy Dive bomber

Need to dig out my underwater video, unfortunately it was the first trip i had a camera, so quality wasnt good, and no lights which is a must


This link has the story of the sinkings and some good photos

http://www.indopacificimages.com/index.php/papua-new-guinea-2/diving-papua-new-guinea-new-ireland-diving-new-hanover/

[Von Hilde]

Ha! Now, there's a complement: Manfred asking me for some pointers. I'll try to be worthy of the request. What, specifically, do you want to see, pal?

(the tit analogy has gone completely out of control!).

M

more like the squeeky wheel gets the grease, or the baby that doesn't cry,won't get any milk. Same O same O GI

[MFR1964]

I try to keep it japanese, otherwise this thread will be fauled with other stuff.

Some more detailed pics about Gene's propellorspinning wonderbox used on his sub, got to know!!!

How exactly do you determen the shape of the propellorblades, i mean the angle and the curve?

And more pics about the tower of the japanese sub (you know why), wether Original from real live or models, i don't mind, the more the better.


Manfred.

[He Who Shall Not Be Named]

I got as far as building the two propeller masters, no production tools put together yet, Dave.

Yes, Gene was ALL OVER those wheels while we were at the NAUTILUS museum display of that craft.



Damned Tease!!!,suck, suck, more,suck,suck, more!!!!!!!!!!!!!!!!

Gene, did a excellent job on that sub, have to suck his brains about the counter-rotating box

Manfred.

Ha! Now, there's a complement: Manfred asking me for some pointers. I'll try to be worthy of the request. What, specifically, do you want to see, pal?

(the tit analogy has gone completely out of control!).

M

[MFR1964]

I got as far as building the two propeller masters, no production tools put together yet, Dave.

Yes, Gene was ALL OVER those wheels while we were at the NAUTILUS museum display of that craft.



Damned Tease!!!,suck, suck, more,suck,suck, more!!!!!!!!!!!!!!!!

Gene, did a excellent job on that sub, have to suck his brains about the counter-rotating box

Manfred.

[He Who Shall Not Be Named]

The prop making process for that model woud be a nice thing to learn, for sure, but if the mold is still available, perhps, already made would be available. That would be Genes Ko Hyo Teki, I am referring to. Did he get the pitch specs off the New London boat for his props.

Oh ... hell! I showed off Adam's 1/16th Type-A propeller work, not Gene's as you requested.

Here's what Gene sent me:

That's him yanking dimensions off the display.

M

[He Who Shall Not Be Named]

The prop making process for that model woud be a nice thing to learn, for sure, but if the mold is still available, perhps, already made would be available. That would be Genes Ko Hyo Teki, I am referring to. Did he get the pitch specs off the New London boat for his props.

I got as far as building the two propeller masters, no production tools put together yet, Dave.

Yes, Gene was ALL OVER those wheels while we were at the NAUTILUS museum display of that craft.

M

[Von Hilde]

The prop making process for that model woud be a nice thing to learn, for sure, but if the mold is still available, perhps, already made would be available. That would be Genes Ko Hyo Teki, I am referring to. Did he get the pitch specs off the New London boat for his props.

[He Who Shall Not Be Named]

Hello Dave,

this is thread has been great but it seems to have run out of steam. Yes I know I'm the one asking for HWSNBN to do all the work posting, however I would still love to see heaps more pics of the build process. Even if they're not annotated, just dump heaps of pics and we can make our own conclusions.

On a slightly different topic I would love to see some pics of propeller making with silicon moulds. I would love to learn the whole process.

thanks for putting up what you have so far put up, dave

dave h

I don't mind posting stuff. But I do mind wasting my time. I'll post when you state a NEED. You want something? Say so! And I will produce.

You don't squeeze the tit, you don't get the milk.



M