The History
The Düsseldorf fire-fighting boat was developed and built by the Rheinwerft company of Mainz-Mombach, and it is operated in the Ruhr industrial region of Germany. The vessel is designed specifically to cope with disaster situations, such as a ship on fire, a major oil leak or a harbor system in danger of explosion, and its fire monitors, operating at a pressure of 10.5 bar, can hurl water or foam 145 feet high and a distance of up to 310 feet. The two V-12 engines produce a total of 930 kW (1260 BHP), giving the boat a maximum speed of around 23 mph.

The Model
The Romarin kit of the Düsseldorf fire-fighting boat is large and capacious enough to accommodate all the equipment required to emulate the wide-ranging facilities of the full-size vessel. Optional working systems include the fire monitors, crane, anchor winch, radar, searchlights, blue light, horn and siren, and also the sound of the diesel engines. The plastic hull is moulded in thick-walled material, and it offers plenty of space for the numerous mechanical and electronic parts required for the auxiliary working systems. The model is propelled by two proven MAX Gear power systems, giving it an impressive turn of speed. Four large rudders guarantee extreme maneuvering capability both forwards and astern. The fire monitors can be swiveled horizontally and vertically from the transmitter, and with the recommended electric geared pump they can fire a jet of water a distance of 20 feet. If a working boat crane is fitted, the vacuum-moulded rowing board can be raised, swung outboard and lowered to the water in true scale style.

The TD SR12 receiver is equipped with a triple antenna (2×2.4G & 1×900M) design that provides multi-directional wide coverage for the remote signal and is designed for RC users who want to benefit from resilience and long-range in their radio communications.
TD SR12 also provides a socket that can be used to connect the NFC Switch panel to enable the built-in Power Switch function. Dual-power provides a safe and efficient way to power the system with your power sources connected via a pair of standard XT30 connections. The dual-power consumption system is designed to operate in balance mode, where it consumes the power line from either power source depending on which has the higher voltage. With a built-in black box module, the data (Power & Signal related) under unusual status during the flight can be recorded by TD receivers.
The configurable 12-channel ports are a big feature of TD SR12, each channel port can be assigned as PWM, SBUS, FBUS, or S.Port. With the FBUS protocol, the Tandem series receivers can open up the possibility of seamlessly pairing with multiple telemetry devices (Neuron ESC, Advance Sensors, etc.) as well as simplifying the builds setup.

Had a little trouble getting my sound to work properly but with a little fiddling got it working a lot better had to reverse motor leads & switch transmitter forward -reverse switch so it would work in forward direction .

Transferred this from my build blog. Quick vid of the starting - sound/ smoke /water exhaust sequence (water not plugged in, but can be started a few seconds later than the smoke). Smoke starts first to heat up, then air pump (timer for 5 seconds delay) then water (TX switch,) - could put in another timer to make it fully auto, but enough spaghetti there already. Also handy for future water cooling if the motors need it (fan cooled so probably not needed.) Left stick is held over to start the sequence, then released to turn the smoke and air off.

I trial fitted a thermal switch to the fans in the dummy motor, which is mounted on the 540 motor. It starts the dual fans at 30deg C and switches off at around 20deg C. Bit hard to hear in the vid (plus the YT transfer removed the middle of the vid, -there was a gap before I put the soldering iron on again,- and at the end don't know why it does this, - doesn't like the format I think😠) Anyhoo, not doing it 3 times! (clipped the end 10 secs off the previous try as well😠)

Fan switch is powered at 8v via a small voltage reg from the main battery (3s 2200 20c) and works pretty well. All fully hortomatic like😊

Smoke air and water switching sequence, (sound's out of sync for some reason,)

A bit more refinement on the timing but getting there. Finally got the voltage regs from China to complete the system. A bit noisy, as the water pump is dry,- quietens down with water. Switches in stages using Grahams magic timer, - 1. smoke on, 2. water and air on. There is actually smoke running constantly at a reduced level once everything is running, but very hard to film. I could turn it up but I don't want it to look like it's on fire😂

A couple of shots taken at Dovercourt in September 2016. I was visiting and so am not able to tell you anything of the boats or skippers. Dovercourt is a salt water pond and plays havoc with switches and brass fittings.
Geof L.

Managed to shoehorn in a GT Power sound unit, and seeing the boat has a 'V8 installed' I thought I'd go with the V8tyest sound there was in the file😁😁. You can hear Grahams timer switch the air and water pumps on at the start of the vid, (after I switch the power on) - off-reset-on and off again before the engine start. The engine sound is a little bit muffled as the unit is buried under everything in the stern, but still gives a reasonable effect (well I think anyway😁)

Smoke, water and air are ready to go,- just waiting for some V regs to come via sampan.

Working on this idea for a bit more refinement on the exhaust smoke idea. Graham mentioned these timers were worth a look, so I purchased a few from Ali Express for about 90c each. They work well for an off/on set-up but not quite as well for an on/off set-up. They are variable from 0-12 secs and have a lot of possible uses. I was trying for a puff of smoke at start-up (which in my application works in conjunction with the twin sound units (HSL and ST) and this initial test seems to work ok (bit of refinement with timing and air pump speed required yet). Already have the smoke going well but there's always a little morsel to add (ref Mr Creosote)

I'll be using the small 5A voltage regulating bucks in the models (the ones shown are just for testing) with one 2s LiPo running 2 regs,- one for pump, and one through the timer for the smoke pen. You can see the timer working with no input from the TX in the vid, When fitted, both will be switched on/off simultaneously with the solenoid 'latching' power on/off, circuit (thanks to Graham for the layout) using the left stick.
JB

As a follow-on to Grahams' comment on our latest collaboration on a smoke pulsing 'capacitor driven' device, we thought it was time to 'chuck it out there' and see what you think. I saw the vid on the guys warship with the very fancy gun smoke system a while ago and thought there must be a simpler way than the sophisticated and technical way he did it.

Having done press setting in my early days, I remembered that a big press we used to set had a hydraulic capacitor which helped get the ram moving (pretty much what electrical capacitors do for motors etc) I started with a common party balloon with no container and knew Graham would be interested, and it progressed from there. As usual, Graham has done a fancy bit of electronic control on his, with solenoid and timing and has it working nicely.
(just received my new solenoid which I will be adding in due course)

Balloon is stopped from filling by a micro switch to the air pump and air is released by solenoid at whatever timing you need (depending on how well your smoker can keep up). If the system has no leaks, the 'capacitor' can hold air indefinitely, ready for use, and will re-fill automatically, (pump only runs to re-fill) This idea can be modified to suit anything (guns, exhaust startup and run, steam to simulate steam whistle etc) Balloons of all shapes can be used eg -(long thin sausage balloons could be fitted inside a tube if space is an issue).

With a good air pump, the 'capacitor' will fill quite quickly and some good pressure can be achieved.
JB

A fan powered smoke unit (modified Heng Long) tried in the HSL. Not particularly good but it's output is reasonably scale(ish). As the fan (12v comp snail fan) just blows into the back of the smoke box without any positive connection, a fair bit of smoke escapes into the engine bay. The fan is hooked up to run with the cooling pump and is left on while running after the smoke (on off remote from the rotary switch) is turned off, and blows the residual smoke from the engine bay out the exhausts.

There are also the 2 small air pumps plumbed into the exhaust outlets via venturi pipe inserts, to blow the water out of the exhausts, (just on the waterline) as any water stops the smoke coming out (surface tension holds it in the pipe). Once I find a decent high volume small quiet air pump, I can do away with these and the fan, which should make things a bit better.
I've ordered some small 12v 40W printer elements to try another smoker idea, but they will be a while coming. Smoke will only be on for startup so shouldn't be too much of a problem.

I've almost become water/vaporlogged/glycerogged with all these experiments, and the other night I actually set off the smoke detectors,- house smells like a glycerine factory for hours afterwards,- but my skin's getting really smooth😂😂😂😂
JB

Just built Krick RO-Marin Neptun. First tug I’ve built, she came out okay, I think. 6volt system, MFA 2.5 geared motor, Graupner SXM switch controlling the lights, older Pixie brushed esc controlling water monitor pump. Old Futaba MC210 for motor esc, Frysky QX7 radio. This video was shot at Towne Lake, McKinney Texas. She well on her maiden, needs about 2-4 ounces ballast in the stern though.