First full operational debut of Twin Submarine Engines

[pedro gomez]

Sabadell 2008 Annual Meeting.
This was the second public appearance of the twin submarine engines, but the first time both engines started and run successfully.
Still I have a lot of work. I think next year my Akula-II will be powered and snorkelled by one of this.
By the moment, the starters must be modified because the torque is very high for the starter timing belts.

[Rogue Sub]

SO this thing is a

SO this thing is a diesel/electric???? Just how big is your boat 9ft?

[pedro gomez]

Diesel Electric

Yes, it is. Is a "diesel", methanol-nitromethane , 12 V DC electric.
This twin engine is designed to power a XXI type 1:35 scale, 2190 mm length.
Also, one of this engines, is prepared to power a 1:68 Akula-II, 1800 mm length.

[tmsmalley]

Wow - I think this

Wow - I think this is a first on either side of the "pond"! Congratulations, Pedro. We are very interested in seeing it installed in your boats! I hope you will consider writing a SubCommittee Report article once they are on the water.

[pedro gomez]

Of course, Tim. I hope

Of course, Tim. I hope it will be soon.

Greetings

Pedro

[Guest]

Ohla Pedro

Con el submarino tan

Ohla Pedro

Con el submarino tan grande yo pensio que una systema de aiere comremido para el submerhtion podra ser conectado a los motores con clutches.Los compresores son bien chicos y fuertes.Asi su submarino sera muy serca a la verdadera maqina.

Ill translate.i was mentioning to him that his subs being so large, he might consider a compressor bassed system,clutched to those powerplants would bring down operating costs ect.

adios Amigo
Amur Ship yard

[Rogue Sub]

You know david your always

You know david your always wanting some engineering competition why dont you take a crack at this one. That way I could atleast see one in preson.

[pedro gomez]

Pneumatics and air compressed systems

Hi Aquadeep

Yes I know.I use this kind of compressor in my subs.
In my U256, 1:35, I use an automatic air compressed system. It have a compressor, a solenoid intake valve, two pressure switches, a 750 cc bottle, and four solenoid valves for three functions:
-raise and down periscopes
-Blow ballast, normal and emergency
-fire torpedo tube
The system load air in surface. A surface detector keep intake valve closed during underwater condition, and keep stopped the compressor.
The system blow ballast in emergency conditions:
-water in bottom, leaks, inner flooding.
-lost of signal radio (failsafe)
-low pressure in the bottle.

Pneumatics is very interesting for make functions outside, like retractable bow planes, periscopes, hatches, mechanic hands, etc etc.
Is most interesting like safety system, because is independent of the main battery, and the radio.
In my Akula-II and XXI, the snorkel raise and down with a pneumatic cylinder. Also, another ones open the snorkel valves to air intake and exhaust.

Greetings

Pedro

[Guest]

Helo Pedro

Im happy to see

Helo Pedro

Im happy to see another compressor bassed sub,not many over here.
Have you looked into miniature hydraulics ,I use it extensively in my subs from masts,doors and even ballanceing the sub.
A gear pump from a windchield washer gives plenty of pressure yet wont over heat and can be run in the freeflood area,cost 20.00$ on Ebay.
Syringes are used as rams,very smoth scale like operation,if there is a leak the sub will not go out of ballance as air systems do.Also pond water can be used as fluid,or a sealed system.On the U-32 I have installed retractable cleats.Air craft silicone fuel lines and aluminum lines are used.very cheap and efective.

Try it get two syringes medium size and hook one up to the pump the other the same,but one has water.the other is bottomed out.When energized the pump will pull one syringe in the other out with great amount of force and smoth action,reverse the pump and the oposite happens.
An endless amount of engineering possibilities are possible with this system especialy combined with Legos robotics ,check them out at Legos .com,or at bricklink.com for the best prices on new and used lego parts.
Cheap, waterproof qualty components that are readily available,that also keeps the sub light with alot of accesories!

I had thought of a deisel electric sub but I knew it would have to be very large and dificult to maintain and cost more to operate than I would have liked,but would have been fun to build.

Very interesting work keep it up Pedro.

Saludos Dave Amur Ship Yard












Notice the syringes are used as rams for masts.Also the multypin military connector with gold pins are watertight.the pump for the masts is the yellow unit.
The drive motor /trany is from a 12 volt Makita drill all bearringized unit.
This sub weighs sum 45 lbs and runs for 2.5 hours.Also it has lateraly retracting hydraulic forward dive planes.





An Akula II I built its a pump sub.The finest detail I have ever seen in a kit.

[hakkikt]

Congratulations Pedro!
Next project: a nuclear

Congratulations Pedro!
Next project: a nuclear reactor?

[Guest]

not quite the first.

Wow - I think this is a first on either side of the "pond"! Congratulations, Pedro. We are very interested in seeing it installed in your boats! I hope you will consider writing a SubCommittee Report article once they are on the water.

Not quite the first Tim. I saw a Darnell Type VIIC uboat in marine modeling in the 90's that had a working snort and diesel/electric drive. It was around the time that Ron Perrott was writing a series of articles about model submarines and how they work. Back in those days the only kits available here where by R&R and John Darnel, and 32nd Parallel in the States where very popular. I used to have a few Darnel boats, quite fun with their steam engine compressors, and plastic bag buoyancy bags. (end of nostalgia). Wonder what happened to that type VII?

[pedro gomez]

Nuclear powered

Hi hakkikt:

No. I't is impossible. I know because I work in a NPP. But other drive systems are in my mind.

Hi Akula 971

Will be very interesting to have more information about this predecessor.

Best Regards

Pedro

[Guest]

info

Hi I'll ask around. I'm sure it was in Marine Modelling, or may be "Model Boats". Anyhoo I used to have ALL the Marine modeling mags for the first few years that they where published. I gave them away to a work mate, so tomorrow I'll ask him if he still has them.

[pedro gomez]

Thank you very much Akula-971:
If

Thank you very much Akula-971:
If something were found, will be interesting scan it to see how this person solved the different questions wich are critical to run underwater efficiently. I suppose between his design and mine will be a lot of differences, and why not? for me will be interesting contact with him.

Best Regards

Pedro

[Guest]

Hello Pedro. I dropped a

Hello Pedro. I dropped a few emails to various people, and found out who made it. It was made by two gentlemen called Bernie Wood and Nick Burge. Unfortunately both chaps passed away some time ago.