Fore and Aft Trim Tanks - building functional trim tanks in model

[witchblade]

Lothar and friends,

I'm a newbie

[color=#000000]Lothar and friends,

I'm a newbie in subs (only 1 succesfull diver at the bench). And now very well on the way with a U-boot with top-hatches for access. I can really appriciate the technics and knowledge that went into your subs. I think those kind of submarines inspire instead of kill the hobby. I now know that it is possible, and with me a lot of people share this vision.

It is good to have people make ready to use components to start with, but to push yourself further and learn how to make better/safer subs on your own, is my personal goal. And I think a lot of people share this goal. So please keep pushing the limits and give us newbies even more to dream about. I was ones told not to listen to others if something works or not, but to try and find out. Or to find someone who has already made it and ask advice which I could implement in my own ideas.

So build your trim system, lose money and gain knowledge.

best regards,

Danny van Dijk
Netherlands
PS]

[gotland]

Thanks Danny,

that's the spirit I

Thanks Danny,

that's the spirit I love in this hobby. If You need help or advice, let me know. I am always open to new Ideas as You know from my articles in magazines over here.

I hope we can meat in Lelystadt.

Lothar (can be also a good guy)

[adriaticsea]

Hi All,

Gotland and witchblade, I

Hi All,

Gotland and witchblade, I concur 100 % with your ideas. Keeping things simple is good, but not forever. I'm building my first RC submarine suing a 1/96 Thor Permit and Scratch built wtc. I didn't chose the easiest way, I didn't chose the quickiest way, but I'm learning a million of things by building the WTC myself.
For me having extremely skilled and capable modelers like Gotland, Gerhard and others like U812 is THE reason to go ahead in the hobby, to put passion and work in it, with the hope to reach someday a level somewhat similar. In this hobby building always the same things with the same system isn't the way to to; evolution towards better, more sophisticated, reliable and engineered models IS the way to go.
BEST REGARDS MAURO

[safrole]

I love seeing "superstar" boats

I love seeing "superstar" boats as the evolution of an individual's knowledge. Lothar you definitely fall into that category. This thread is about trim tanks, so beginners will hopefully understand it's an advanced topic. Really by the time they are ready to build a boat that could benefit from a set of trim tanks, they'll have their own opinion to add to the debate.

[guillermo pelaez]

I fully agree with witchblade

I fully agree with witchblade comments. Being a newbie, I think we all enjoy the “under construction” threads from U812 (excellent boat!), and all the others that followed that one. This section has jumped a magnitude order with all this construction threads, and the newbies (or at least this one ) is learning a bunch! Keep posting the fancy high-tech dry-hull and all those gigantic boats, as well as anything else capable of floating, submerging, and coming back to surface! We learn from all, and even if the particular feature in one boat is now out of your league, and even if it might be always elusive to some of us skills, we still enjoy watching what others are capable of. So, don’t be shy, easy building or impossible to manufacture outside a sub shipyard , there are many hobbyist that will enjoy and learn from the posting being so unselfishly shared.

I am not using trim tanks in my project (Akula scratch-build, almost ready), but it certainly seems to have advantages for trimming, specialy for those boats that do require trimming with foam above the water line, or even for operating the boat if you don’t use off the shelves electronics, which was my case. Now addressing the topic for discussion goes my question:

Is there any ratio in volume between the trim tanks or pistons and the main tank? I mean, the full capacity of the trimming tanks is around 20% of the main one? I guess that if the main tank is capable of submerging most of the sail, then the trim tanks should be responsible for static levelling and actually statically submerging the sub right?

Thanks for sharing all this information and point of views, all of them very useful. And remember that limits are those of vision.

Cheers,

PS: Skip... will be enjoying a thread of your not that all "newbie" friendly buildings? I sincerely hope so. So much to learn and so few hours for the hobby

[gotland]

Dear Guillermo

thanks for Your comments,

to

[color=#000000]Dear Guillermo

thanks for Your comments,

to answer Your question, my Tijgerhaai and Gotland (very similar boats) have about 6 Litres Ballst and 800 Millilitres trimming. About 1-2% of the whole displacement of the sub should be goog enaugh. Trimming in my boats is for RC-control adjusting not more.

regards

btw]

[guillermo pelaez]

i ve seen Your job

i ve seen Your job on el s. Well done! Especially for a "biginner".

Well, thank you very much indeed... coming from you, I will print your post and frame it!!!

[don prince]

Hi Lothar,

What magazine? What articles?

Hi Lothar,

What magazine? What articles? I'm always interested in reading good technical U-boat, and model sub articles. I do have a difficult time translating German to English. I have to use my language dictionary and internet translators. I really had a problem with the "Tauchvorschrift Für Unterseeboote" M. Dv. Nr. 381, the photo copy of the German script text is extremely difficult to decipher.

Best Regards,
Don_



Edited By Don Prince on 1131067076

[gotland]

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Edited By Gotland on 1141078785

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Edited By Gotland on 1141078785

[typ 202]

Following is a poem of

Following is a poem of W.B. Yeats. Open to interpretation. I still don't understand his true meaning. I think that sometimes the hard way is the more interesting way and that the same problem can be solved in many ways I suppose.

THE FASCINATION OF WHAT'S DIFFICULT

THE fascination of what's difficult
Has dried the sap out of my veins, and rent
Spontaneous joy and natural content
Out of my heart. There's something ails our colt
That must, as if it had not holy blood
Nor on Olympus leaped from cloud to cloud,
Shiver under the lash, strain, sweat and jolt
As though it dragged road-metal. My curse on plays
That have to be set up in fifty ways,
On the day's war with every knave and dolt,
Theatre business, management of men.
I swear before the dawn comes round again
I'll find the stable and pull out the bolt.

written 1910

typ 202

[mylo]

Slipping through the watery realm
A

Slipping through the watery realm
A submarine skipper at the helm
He commands his crew to make 'er run
He commands his crew, his crew of one.

In the water the boat looks real
All the gazes a shore she will steal
Trim it up, make it ready to go
When given the order, the tanks will blow.

"Periscope Depth", a tricky maneuver
Like a helicopter in a hover
Now it's dime to taker it down
Dive ! Dive ! Dive !, but don't run a ground.

To cruise at depth makes it all worth while
On the skippers face, a youthful smile
This is no game, this what you see
By God I'm in charge of this sub at sea.

And when the day has come to pass
Pick up that boat made of fibreglass
Return to base, ...and that is that.
Now put away your skipper's hat.


This poem is dedicated to all R/C sub nuts everywhere.

Written by Mylo November 5, 2005

[typ 202]

I think that if we're

I think that if we're going to add more poems here we should at least refrain from those of the "There once was a girl from Nantucket..." genre.

LOL.

Really nice Mylo. Very clever.

Mike

[don prince]

Hello Lothar,

Vielen Dank, spricht meine

Hello Lothar,

Vielen Dank, spricht meine asiatische Ehefrau vier lanuages; Indonesisch, holländisch, Deutsch, und Englisch. Wir planen zu reisen, wenn ich pensioniere.

My email address is]don.prince@ncr.com[/email]

I would highly appreciate any information about basic theory and design of model subs.

I will purchase three copies of original WWII Type VIIC manuals form a fellow in Germany this February. I want to understand the basics about the Battery rooms/Switchboard/E-motors. I plan to write an article for the SCR on this subject.

Best Regards,
Don_



Edited By Don Prince on 1131314011