German Type VII R/C buildup in 1/32 scale - CH.7: TRIMMING 

I got hooked on rc back in 79 as a kid . I live in Manhattan NYC and my parents took me to central park to watch the model ship's. Needless to say the coolest model I saw was a rc submarine that day. I was so impressed and taken back by this video of you building this work of art yes I said work of art lol. You have re-inspired me and not only that you brought me back to my childhood and for that alone I have to thank you. Now if you can only tell me how to break the news to my wife I'm planning on turning our study into a model ship yard for the next year without having to buy her a new diamond bracelet I would appreciate it lmao. But all joking aside awesome build thanks for sharing it.

I am blown away by this amazing work. Good job! And I really love the paint job on this U-Boat, so badass! Makes the Type VII look even better than it already is!

You did a great weathering job on the sub. About 4 decades ago, I went thru a sub phase purchasing a VII and Gato class sub from an outfit called 1/32 Parallel and after market stuff for them. It's interesting to note that the entire hull of the VII fits comfortably inside the Gato. This video entices me to get back in to preparing one of them for operation before my heart stops for ever. Keep having fun.

Never thought I'd see something like this, let alone watch it through. Nice video! And informative as to what where and why. like

This is awesome!!! I still have the wooden hull of a Bismark model that I was attempting to build back in junior high. This is a super looking sub!! Nice job.

Very cool video. For those of us like myself who are interested in building an RC Sub this helps out quite a bit. Your build quality and paint weathering is top notch!!!

Its a hobby, and people getting professional, like studying science. I'm impressed

Beautiful model, had no idea of this aspect of building a sub, very cool and interesting.

Incredible build. Your work is amazing.

WOW this one Looks great! Very good job! Greetings from Germany

What a fantastic model construction work. Thank you for showing.

Damn that is a nice submarine. Impressive!

So glad I found your channel. I've always been interested in uboats and particularly the Type VII. Years ago I sent off for a printed copy of the 32nd Parallel catalog, I'm pretty sure I have it somewhere. I wanted to get the type VII model someday and was so disappointed to see the company go out of business. I think I remember finding OTW awhile back but I since then forgot about it. Hopefully they will still have this model when I have the money and room for a project like this. Looking forward to lake trials.

Very nice model. Also I love the wall hanging of Jules Verne's "Nautilus". Thanks for the video.

This is like 100 times bigger that those i had when i was a child. :) Beautiful piece.

Excellent detail work and workmanship. I have built a USS Albacore from SubTech awhile back and know how much work is involved. I'm going to check out your lake trial video soon.

Your detailed work on the sub is awesome love how the sub just looks authentic from every angle great work!! Actually great work on every aspect especially the self-contained ballast/powertrain module! If I were to have the talent and patience to do something like this I _may_ have added a smoke module to the sub to mimic the diesel engines running when surfaced to recharge the battery array. Overall tho I love it, I really do!

Wow! it looks fantastic, very realistic.

Great(Tremendous). I have to look at your 7 movies. I am admiring for the care of the detail which you show. The transformations that you brought to the submarine are also extraordinary. PS: traduit du Français en Anglais avec Reverso.

Damn... how did I miss this? One the best videos I've seen in a very long time! subscribed for sure!

Hi friend Congratulation, this RC/ U-Boat is one of the best i ever seen, coz it is so super weathered and aged. you have good view for details, i like your U-Boat so much. Greets from Germany

Your A Master Ship Builder Ingenious Genius, Bob Martin!!

magnificent work you did here.

Just finding out more how difficult doing the trimming and how involved it is. There are so many things to adjust it seemed with ballast and foam, etc. Submarines RC isn’t as easy as one would think. I’m learning more. Bob Martin’s videos are very informative.

Excellent videos...all of them...all the way - I'm Subscribed! :) The comment you have in this video at 13:45 is extremely important, especially with naval submarines because when doing an Emergency Blow, if the water in the ballast tanks isn't pressurized correctly and only air is expelled, the submarine can actually 'run out of usable pressurized air' and begin to sink without being able to correct its trim. If it sinks to a safe depth, pumps can compensate positive buoyancy; if it sinks to deeply...that's it! (Or, high-velocity pressurized air can cause the ballast tank valves to freeze causing an ice blockage, as is suspected to have happened to the USS Thresher(SSN-593)...but, that could never happen with models in semi-warm water). With your model(s), if one was to accidentally use up all its air to surface and it sank, you'd have to snorkel or scuba to retrieve it...right? I was going to ask if it is (they are) 'positively buoyant' so they'll always surface; but, that can't be if the submarine(s) only submerge when the ballast tank is full. If it remained full, the submarine would remain submerged. As with 'real' submarines, they're designed to 'submerge'...and, hopefully, surface ("Das Boot" 1981 with pumps). RSVP - I'd like to know what you'd do if and when one of your 'works of art' (I meant that sincerely - they're BEAUTIFUL - aging hulls and all!) became trapped; lost; tangled in seaweed; attacked by a catfish with an attitude (or, your "20,000 Leagues Under The Sea" Nautilus is accosted by a baby squid). :D I'm laughing, but...IT'S NOT FUNNY! I'm curious because, in my youth, I was into RC cars, tanks, ships, and, Estes Rockets. I once fired an Estes Rocket into the sky and all was going well - it went just out-of-sight; we all heard the distant explosive 'pop' of the parachute release; then, we watched as it slowly came into sight and descended back to earth...then, just before touchdown, a f'ing red-tailed hawk attacked, grabbed, and, flew off with it!? I lost a $100.00 model (in 1995) because of an angry and protective raptor...you could lose "how many hundreds of dollars' because of a pissed-off fish! Viper fish have left tooth marks on the desks of nuclear submarines - imagine what a large and upset northern pike or bullhead could do to one of your submarines? At best, it may surface hundreds of yards from where you thought it was. A Largemouth bass may just destroy it! A swamp aggressive fish could drive it off course and lose it! Such a sad loss! Just curious - I've lost 'remove' toys before.

Fantástico amigo!!! Parabéns excelente vídeo!!! Congratulações aqui do Brasil....

That's cool as all hell. Can't wait to see more of it.

Nice video Bob! I just picked up a gato class sub that is 63" long so this is very informative. Still working over my Nautilus not ready to go. Stacey

Dang ! You good at this. I can fully understand how crucial it is getting the trim just right - just like the full-sized boat. It is soo nice when things work out more less the way you planned. I think it would be impossible to get the model off the work-bench and in to the water and immediately achieve perfect trim, - but man, you were sure close.

Quel magnifique travail. Bonjour de France !

Very smooth looking setup

Thank You Bob. Great tips...! Great job.

Absolutely awesome model 😍😍👍👍

Awesome build, well done. Traded for a Bluefin sub not long ago, getting close to tryin her out. And yeah, go dirty up you shop a bit your making me feel bad. lol

BEAUTIFUL model

That tip at 17:00 I find as very important due to the fact that all my testing would be in a backbay or lake and it would be hard to retrieve. So thanks again.

Awesome work!!!

This is awesome! Movie special effect quality

Awesome explanation, great video

it took me way too ong to find this channel. FINALLY!!!!

The boat looks awesome in the surfaced position

Never built a sub bit this was awesome to watch.

Beautiful model!

actually one of the best rc sub I've ever seen!! (and way better them my akula

Very interesting series, you brought on.... was interesting to follow.... :-) Thumps up...of course! Bestw wishes and thanks! Holger form Subwaterfilm

Nice R/C model!!!

very nice work

Very nice model dude

An easy way to remember the math in buoyancy: The buoyancy of any object is equal to the weight of the water it displaces, so volume of displaced water times density. If your boat is lighter than that it will float if heavier it will sink, if equal its neutral. Fg is the force due to gravity (weight) of the boat its Fg = m*g (g is the accelaration due to gravity 10 m/s^2) and the lifting force you can get from the water is Fw = d*V*g (density of water times volume of the displaced water times gravitational accelaration) the difference between Fw and Fg tell you how much weight you need to remove or add for the desired buoyancy. You can approximate the shape of the sub as a cylinder that should be good enough. Or you could use two cones.

Thanks for uploading!

also... let me add... with the "reserve buoyancy" comes the extra effort the drive motors have to do to fight that buoyancy for submerged operation. If you can truly become neutrally buoyant you wont spend your batteries so quickly, the motors wont have to work so hard and you can dive and surface under power at trim. Also, unless the boat suffers a catastrophic failure it will stop and hover at whatever depth it loses power (if batteries died). I respect your work and I don't want to seem to be a downer.. I'm just adding my unsolicited two cents worth.

Loving those Nautilus posters in the background...

very nice work.

Fantastic boat

That's a cool submarine! I subscribed.

fascinating really like watching

My pool is chlorinated, yes, but I keep it at relatively low concentrations, particularly when compared to public pools. Chlorine and other chemicals and/or minerals can impact the radio wave transmission through water. Fresh water is best, with salty ocean water worst...

Now that is impressive!

dont know what he does for a living but thats a pretty nice house.

For the large models, does it become practical to have fore/aft trim tanks and gyro type inputs to keep the boat level?

so the hull plays no part in flotation?

Thank you for the math :) Love your RC subs

where can i buy this remove control submarine?

Well done!

nice I wanna see that nautilus submarine when its done that will be really cool

You got the flag upside down, for the rest the sub is rock solid

Spray paint the inside of the water tank with hydrophobic spray for 100% water extraction. Leave just a strip at the bottom, where the water collects for the pump.

Which dive system do u got ?

I love the Nautilus on the wall as well.

where can i buy a RTR uboat ??

You could add some partitions inside the ballast impede displacement of too much water.

I was on a real sub recently when they tried to get the trim. It took weeks to get right

Sehr gut . Submergir nivelado , muito bom . Valeu Bob .

Are you making bits for the sub using the 3D printer you got going on in the back ground?

Where do you get one of these I like it

Where did you get it

Verry intresting!

good drydock!

Video is great as is, and technical would never need changed. Given the scale of the submarine; wonder if it would be possible to *temporarily* mount/attach something such as a GoPro. Sadly that would add additional floatation and also effect trim level. Through a slight bit of editing (changing the frame rate) it would look like a motion picture

Could you use high temp epoxy to seal off chambers for the battery and actually use the exposed ballast on the submarine for authenticity?

how it puts air into the ballast when it is under water ???

if I was to start building subs what would you recommend for a rank beginner- visited Lorient many times so u boat would be good

so where to buy a RC model as big as this submarine ? i need a link

is this scratch built if so where did you get the plans as i am wanting to do one at this scale but design it little longer as a D model. I having probs designing the hull as I am new to sub designing so used to designing aircraft

It that 32nd U boat? I got one. However, many parts were lost. Any way to find the parts in the market?

Nice boat

The inside of the sub is not watertight? The interior is flooded except for all the electronics in the plastic tube.

willst du ein 2,6 meter langes u-boot kaufen ??

I know it's an old video. I've got the 1/48 scale and I can't imagine the 1/32nd scale, that thing must be a monster in size.

would you give to me that U-Boat for me ?

I'm insanely impressed by your work with all the painting details, coatng, salt, and wash. Looking forward to see it in the lake. Could you please share some links to places who sell the type VII, the engine and buoyancy tube. Thanks for sharing.

Hi That model is amazing!! Wunderfull job. Do you make that model allso to sell? And if you do what is tha prize?

verry niceeeeee U99 wolfpack

that's so cool. if I had a pool that's what I'd use it for haha.

Very cool indeed. Where is the antenna for the sub. is it up where the servo arms are at in tht container? What is the range of the sub when you hve it on the lake? I'm curious have you ever used a camera in one of your subs just to see what is under the water of a lake or is that not possible? Thanks for the video I really enjoyed it and had always thought I'd like to try my hand at a sub never thought too much about it. I tend to stick with RC planes & Helicopers

How does one acquire an RC U-Boat?

Umm... I love your vids so far... but, as a Submariner, I would suggest two ballast tanks.... one fore, one aft. this allows you to trim evenly. I know its more work, but, if you would use ballast tanks that form the side on the inner hull instead of the foam, even using box shaped tanks on the keel line, you could control ballast/trim easier. Using one servo with both vents hooked up to each side of the arm, you could open and close vents simultaneously.

Muazzam güzel... Harika 👍❤👌

Vert good job 👍

muito, muito legal.....