Japanese 1/16 scale A Class midget submarine build.

[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

[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/

[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.

[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

[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.

[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]

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.

[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)

[Von Hilde]

Manfred, there are several fotos of the I-18tou at the Naval Acadamy at Eta jima in Japan. The electric dynamo is very impressiveone thing I have noticed is that several pictures of that type of propulsion on the migets have the forward prop a greater circumfrance than the aft

[george]

Hello

Oh Master HNSBN

Would you grace me with a few things:

1. Copy of Gene`s Type A submarine build plans?
2. Instructions of how to build his counter rotating propellers gear box? Is Gene`s and Adam` props. the same size?
3. The chance to buy from you a set of those metal propellers?

Also you said you had email Adam reg. his build, what has happened with that conversation? IS he going to sell a copy of his hull?

Please let me know and PM with price and payment information.

Thank you for Your Indulgence.

George

[Von Hilde]

Oh! Oh! Dave the sleeping dog just woke up. I should have never stepped on his tail. If you ever do decide to run off a couple castings, of course I would be more than happy to compinsate you with yankey dollars. Hmmmm, building plans?.... oh!, would they come with the KIT? do you have any RTRs in the shed?? painted? with the little flag and the poop on the tower?( just kiddin) OK zero dark 45, got to get serious today, There putting sewers in down here in the middle keys, finally. Stacks and stacks of pritty blue PVC all diameters. Lots of short pieces left over.

[He Who Shall Not Be Named]

Hello

Oh Master HNSBN

Would you grace me with a few things:

1. Copy of Gene`s Type A submarine build plans?
2. Instructions of how to build his counter rotating propellers gear box? Is Gene`s and Adam` props. the same size?
3. The chance to buy from you a set of those metal propellers?

Also you said you had email Adam reg. his build, what has happened with that conversation? IS he going to sell a copy of his hull?

Please let me know and PM with price and payment information.

Thank you for Your Indulgence.

George

I don't PM. Conduct business here (However, 'sensitive' stuff like mailing address, you can e-mail to me).

You're in luck, I'm slumming today -- I'll talk to you mere mortals today as though you are my equal:

1. E-mail me your mailing address and I'll fix you up -- IF you promise to do something with them!!!! dmeriman@aol.com

2. Gene's and Adam's models are different sizes. Adam's is 1/16. Gene's is 1/32. Let's hope Gene is following this thread and will give you the answer you're looking for

3. I've only gotten to the master stage on the 1/16 propellers, no tooling from which to cast production parts. Anyway, I don't sell anything outside of the Caswell catalog. All commercial work is handled by Caswell.

Talked with Adam about Merriman-Caswell going commercial with his 1/16 Type-A. He's agreeable to the idea, but we have not come to terms yet. Also, once we get to an agreement (IF we get to an agreement), it will be years before I can get a kit ready for market.

Stuff I send out is on my dime -- I don't take payment outside of Caswell. So, when I send stuff out it is free and a favor from me to you. And I fully expect you to DO SOMETHING WITH IT! Aint' that right, Romel?

I now ascend back to my throne, atop Mt. Olympus (crack of thunder) where I continue to watch over you little-people, as I issue the occasional snort of contempt.

M

[redboat219]

Stuff I send out is on my dime -- I don't take payment outside of Caswell. So, when I send stuff out it is free and a favor from me to you. And I fully expect you to DO SOMETHING WITH IT! Aint' that right, Romel?

M

Using it as a door stop.

[He Who Shall Not Be Named]

Using it as a door stop.

LOL. You SOB.

(Ellie was reading your response over my shoulder. She's currently OTFLHAO)

M

[Von Hilde]

I was looking around at various commercally made model props I found these made for a Kurtz, but, they could be stacked 90mm fwd 80mm aft, bore the shaft hole in the fwd to accept the RH drive shaft tube and the inner shaft LH. The blades need some tip trimming to resemble the original's tip shape. Just a theory, dont want to buy a $100s worth of props to experiment on a whim.