Welcome to the Grand Slalom of human-powered submarine racing, where teams of university students design, build, and race flooded submarines around a challenging underwater course in Europe’s largest freshwater tank. Does that sound like the kind of awesome engineering you really want to do? Do diving and underwater science rock your boat? Feel like working with a team to snag a world record for your university?

Then you’re in the right place! Our sport is always happy to welcome new teams. Here’s some info for you, your teammates, and your professors, on how to get started.

You're racing... submarines?

The eISR is a biennial, year-long competition for university students that begins with an extensive design and build phase, continues through a qualification round, and ultimately winds up with a two-week submarine racing event in Gosport, on the south coast of England. The winners are those who can combine the best of engineering, biomechanics, sport, and teamwork to produce a highly manoeuvrable, controllable, and above all, fast underwater racing machine.

The machines that take part in the eISR are submarines in the truest sense of the word, minus the one constraint of a watertight hull. They are designed to operate safely at depths of 3 to 6 metres, where they float neutrally buoyantly. The pilot, who is a scuba diver, straps their feet into a set of pedals and drives a propeller or other propulsion system using muscle-power alone. Steering is achieved with joysticks and mechanical or mechatronic control systems driving rudders and dive-planes.

Check out our teams page for examples of what the teams have built over the years. We differentiate between propeller-driven submarines and those powered by an alternative propulsion system, usually inspired by nature – think flapping wings or undulating fins.

The eISR is for teams of university students. Typically team members come primarily from engineering and sports sciences. However, since each team needs to self-organise and raise its own funding, many teams include students from business, communications and public relations to name but a few.

Not every team member must be a diver. Each team does however need a minimum of four divers, including the pilot. All divers must be qualified to dive independently (e.g. PADI Open Water Diver) and have completed at least 10 dives post qualification. The lead diver of every team must have completed a total of 20 dives post qualification.

Glad you asked. A core part of engineering is the ability to work within budgetary constraints! The race entry fees are £1100 (1500€) plus tax. The biggest hurdles for a team getting started are scuba gear and training, building the submarine, shipping and travel to the races. Do some calling around and find out what deals you can make. One European team recently calculated 3000€ to build the sub, 2000€ to learn to dive, 4000€ for diving equipment, 5000€ for travel, 3000€ for shipping, plus the race entry fees. Materials and training costs will vary hugely from place to place – some teams have diving instructors at their university, others have to rely on external partners. Most teams report that their universities cover the entry fees. The rest is all about raising sponsorship.

You can email Prof. William Megill (Race Director) directly at info@subrace.eu.

Okay, I'm in!

Read the whole of the website, including the rulebook, then talk to your classmates. The project is a cool one, so you shouldn’t have trouble generating initial interest. Go for a mix of engineers, sportspeople and business students. If you can recruit a few divers, that’s really useful, but you do have time to learn, so don’t sweat it. Once you’ve got your team together, elect a captain, a chief engineer, and a communications officer. Set expectations carefully and be reasonable about time commitments (students are busy people!). Then go find a professor.

The eISR programme was designed by a team of academics with many years of experience teaching engineering design at the undergraduate and postgraduate level. The content is ideal for group projects, capstones, or final year research theses. It fits nicely into the context of marine, manufacturing or mechanical engineering. Aerospace engineering and physics are also other natural academic homes for the project. So look for interested professors in those teaching and research areas. If you have a Design Centre or a FabLab/MakerSpace, try asking there whom to approach.

The diving commitment is sometimes worrying, and the budget can be daunting, so be well prepared to argue the project’s worth! The trick is to put together a proper project proposal with carefully thought through plans with budgets and Gantt charts (you learned all of this in class – time now to put it to use!).

If your target professor wants more information or reassurance about the competition and what it would mean for them and your school, they can email the Race Director, Prof. William Megill, at info@subrace.eu.

This is another area that will depend a lot on how you’re set up in your local community. Your professors will have some ideas of companies they often work with. Talk to your Design Centre, FabLab or MakerSpace. Your school almost certainly has a knowledge transfer office which will be in charge of outreach to local companies. Ask your professor to speak to the head of department or faculty dean about whether the university can pay your entry fees, support your travel, or otherwise help sponsor your activities. Your school probably has a “friends of” organisation – some kind of local community funded foundation that funds university projects – talk to them, or have your prof talk to them. Approach your student societies. The professional engineering bodies might be able to help, if you have a local chapter. Lions Club, Rotary, those kinds of organisations might have budgets.

Then go pound the pavement – talk to companies, especially the HR people. Take your plan and budget with you, and have a good set of options that they will receive in return for funding you at different levels. Speak to your parents and ask them to ask around their networks. Cake sales, barbecues, packing shopping bags, car washes – lots of ways to raise cash, and remember that lots of smalls eventually make a big. And finally, look to your own finances. For many teams, one of the commitments members make is to pay for their own travel, or part of it.

Can you give me some tips on designing a submarine?

Engineering design is in practise pretty much exactly what you learned in class. You start with a specification of what you want to achieve, then think about the physics you’ll have to work with and break up your requirements into subsystems, brainstorm and evaluate the design concepts that could solve your challenges, and finally do the detailed calculations and drawings that bring your design to virtual life.

Your submarine follows Newton’s laws. In the forward direction, you’ll need your propulsion force to be larger than the drag on the hull. In the vertical direction, the buoyancy and weight need to be equal. Control is achieved using lift surfaces acting on the rudders and elevators that generate moments around the centre of mass which are opposed by inertia and drag on the hull.

There are six subsystems which you’ll need to design.

Hull & hatches
this includes the shape, strength, weight and buoyancy, plus hatches and latches. Remember the hull has to contain the diver completely, along with all of the submarine systems. This subsystem also includes design for drag minimisation.
Propulsion
what are you going to generate forward thrust with? A propeller? Counter-rotating props? Non-prop wings? Best advice if you’re starting out – keep it simple. A single prop or a pair of MirageDrives. You can add complexity once you’ve got the machine going forward.
Power transmission
typically beginners use bicycle gears and chains. We highly recommend not doing that. Look for lightweight chains and sprockets that are not designed to come off easily like a bike chain. Bevel gears are simple to specify, but the gearbox is hard to make because it has to resist pretty ferocious forces without deformation.
Control fins
you’ll need rudders and elevators. Simple flat plates will do, though most teams opt for more efficient hydrofoils. Decide whether to put them in front or behind the propeller. Good reasons for both.
Pilot controls
most teams use a pair of joysticks connected via Bowden cables to levers on the axles of the control fins. You can get fancier with a single combined joystick, but remember that your pilot needs to hold on with both hands to generate enough force in the pedals to accelerate the submarine.
Safety system
the rules specify what safety systems must be incorporated into the submarine. The safety buoy is the system that most often lets teams down. Spend real time thinking about how to design a really simple system that won’t jam. Remember to consider buoyancy.

The rule book is available on the subrace moodle site, or can be downloaded below.

Get the rules

To design the submarine, you’ll need a whiteboard, some paper, a big table, and a set of sharpened pencils. A calculator will also come in handy. Once you’re done with the design, then you’ll need a computer and some CAD software (there are lots to choose from – ask your prof or Design Centre technician). For the build itself, you’ll need at minimum a 4m x 4m room, plus access to machine tools and a place to work with fibreglass. For practise, you’ll need a 25m pool with a deep end at least 4m deep.

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