Racing a One Design

A model boat made to the highest quality standards available and of fantastic value, - without the need for continuous tinkering, we have devised the 3x1 with regattas in mind. There a plenty of different types of model boat classes in which the owners will thrive on modification, but this one design yacht is a first!

The 3x1's advantages at a glance
- ready for sailing within a matter of minutes: one screw for the keel and another one for the rudder
- easily transported: the mast does not only detach, it's also separable
- easy access to interior via the waterproof Weck cover, a lid similar to Mason jar tops
- your boat will go for an impressive while on a full battery charge - enough for an entire day of racing
- we strictly abide to measurement regulations - to minimize modification and increase sailing time
- the boat's low total weight will help avoid damage after collision
- standard remote control components and a 2.4 GHz transmitter eliminate the need to change frequencies
- reasonably priced individual designs that visually add to any race
- the 3x1 can be sailed in a variety of wind speeds
- the boat is largely resistant to saltwater; other than the electronics all metal parts are insusceptible to corrosion






1.10 These Class Rules intend to ensure fair racing of uniformly sized yachts during a championship without incurring additional cost. Furthermore shall they eliminate any benefit from undue advantage by overly creative tampering or by using superior materials without permission. Regattas are to be decided by skill and not through hardware interference.
1.11 Eligible yachts wishing to compete in the 3x1 One Design Class are required to adhere to the default requirements specified by the 3x1 model originally engineered by stockmaritime. Strict compliance with the initial model's size and technical equipment is mandatory.
1.20 Any 3x1 owner attempting to benefit from unfair advantage by using different materials or applying a disproportionate amount of additional work will be disqualified. In order to prevent this, regulatory gaps in this document shall be supplemented or amended as required if an individual rule breaking offense occurs.
1.21 To err is human - the information supplied here comes without liability. We kindly ask to provide details of any information that has erroneously found its way into these regulations by sending an e-mail to Amendments are to be administered in accordance with paragraph 1.10.
1.30 Among others, the following materials are not authorized for racing: Titanium and Gold, with the exemption of gold plated contacts.

2.10 The total weight of the hull must not exceed 1350g and be of no less than 1200g.
2.11 Items weighed to establish the total heft of the hull are:
- the rotary actuator controlling the rudder plus the servo in charge of the sails
- transmitter, receiver and switch
- jib as well as main boom, sheets
- Weck and splash guard covers, tiller line pulley

2.20 If the summary of all of the above components does not total the required minimum weight, counterweights are to be placed in the void beneath and in front of the rudder's rotary actuator (main servomotor).
2.21 These counterweights must not exceed a total weight of 100g.
2.22 Any further interior ballast other than what is specified in rules 3.21 and 4.11 will be subject to disqualification.
2.31 The superstructure of the boat's hull is to remain untouched and must by no means be modified. The shape of the hull in particular, must not be widened or narrowed in form.
2.32 The beam must at no point exceed 230mm and any boat wishing to participate in championship must fit the original stockmaritime 3x1 assembly form to verify its eligibility.

3.10 Only two remote control features are permitted: rudder steerage and sail control.
3.11 The exact position of radio control components inside the boat's hull is predetermined by their respective standard mounts.
3.20 The total minimum weight of batteries or rechargeable batteries is limited to 340g.
3.21 Any battery not in compliance with 3.20 needs to be weighted down until the required minimum weight is warranted. A lead counterweight should be placed inside the appropriate battery compartments.
3.30 Championship participants are free to chose transmitter and receiver as they see fit.
3.31 Telemetric data collection is solely permitted to monitor voltage and power of the batteries in operation.

4.10 The weight of the keel must not be in excess of 1650g and comply with a minimum of 1500g.
4.11 In the advent of a keel lacking the required minimum weight, a single counterweight of up to a maximum of 100g may be mounted inside the hull.

4.20 Only one keel is permitted per regatta.
4.21 A damaged or broken keel may be replaced at the discretion of the regatta management.

4.30 The shape of the keel my not be altered at any time. Its surface may, however, be smoothed to perfection and varnished.
4.40 Shifting the keel's position is not allowed.
4.41 All participants are required to place the keel's trailing edge within a distance of 498mm and 508mm from the lower transom of the stern - measured midships alongside the chine.

5.10 The weight of the rudder must not exceed 70g and be of no less than 60g.
5.20 Only one rudder is permitted.
5.30 The shape of the rudder must not be modified. Its surface may, however be smoothed to perfection and varnished.

5.40 The position of the rudder is not to be changed.
5.41 The centre point of the rudder's fin shaft must be positioned at a minimum of 125mm and a maximum of 135mm from the transom - measured amidships alongside the chine.

6.10 Maximum surface area and outline may differ from the luff profile of the standard stockmaritime light wind sails (please see bottom of this page to download the 3x1 sail outline)
6.11 The luff profile is optional, taking into account the sails medium width.
6.12 Leech curve may not be negative.
6.13 The use of smaller sails is permitted but limited to a maximum of an additional three sets (each consisting of head and main sail) throughout the championship.
6.14 Damaged sails may be replaced at the discretion of the regatta management.
6.15 Sails must have been manufactured from a single panel only.
6.16 Leech, lower leech and top of smaller sails must be in compliance with the dimensions of standard stockmaritime sets.

Sailing cloth material:
6.20 Non-rigid sails made of foil are not permitted. Only sails made of woven fabric such as spinnaker cloth or similar materials are to be used.
6.21 Sails may be reinforced, but are prohibited from exceeding a total area of 200cm2 per sail.
6.22 Sails of lesser quality fabric thickness only intended to last for the duration of the competition are not permitted.
6.23 Only a single batten is allowed - at the top of the main sail.
6.24 Sailing cloth weight must not be in excess of 80g/m2.

The main sail is required to meet the following criteria:
6.30 The top must, horizontally measured towards the back, be no longer than 115mm.
6.31 The main sail's leech foot must not be in excess of 480mm at its lowest point.
6.32 Medium width is not to exceed 240mm from the farthest fold when tack and head are overlapped.
6.32 Leech curve length from clew to head at top rear may not be any longer than 1545mm.
6.33 Leech curve from clew to head at top front may not be any longer than 1560mm.
6.34 Luff curve straight from tack to head lower front may not exceed 1612mm.

Required head sail dimensions:
6.40 The top must, horizontally measured towards the back, be no longer than 25mm.
6.41 The head sail's leech foot must not be in excess of 480mm at its lowest point.
6.42 Medium width is not to exceed 365mm from the farthest fold when tack and head are overlapped.
6.43 Leech curve length from clew to head at top rear may not be any longer than 1185mm.
6.44 Leech curve from clew to head at top front may not be any longer than 1180mm.
6.45 Luff curve straight from tack to head lower front may not exceed 1382mm.

6.50 Sail numbers on the main sail must be of at least 40mm in height.

7.10 The trailing edge of the mast needs to be positioned midships at 630mm from the upper transom of the stern.
7.11 The boom's gooseneck shall not be farther than 1040mm from the upper transom.
7.12 No part of the head sail shall protrude an imagined vertical line at 550mm from the trailing edge of the mast at deck height.
7.13 Shrouds shall be fixed no farther than at 525mm parallel from upper transom.

7.20 The gooseneck of the main boom may not be of a height greater than 70mm midships above deck. Deck is hereby defined as a continuous line extending amidships from forestay fitting to across the foot of the mast.
7.21 The pivot point of the gooseneck needs to be positioned horizontally at between 35mm and 44mm behind the trailing edge of the mast.

7.30 The overall weight of the mast including shrouds, lower shrouds and jib topping lift with hooks may not be less than 65g.

7.40 The height of the mast above deck must be no greater than 1715mm and be of no less than 1700mm.
7.41 The upper part of the mast may be removed in the event of storm sail use.
7.42 The forestay mounting point is defined by the length of the mast and may not be fixed at a height greater than 1435mm above deck.
7.43 Above its forestay mounting point the mast may be narrowed as desired (in accordance with 6.30).
7.44 5mm is the minimum requirement for the diameter of the mast from deck to forestay mounting point.

7.50 Only a single pair of lower shrouds is permitted.
7.51 Shrouds including lower shrouds may only be adjusted by turnbuckles.

7.60 Boom length may be according to personal preference but its diameter must not exceed 10mm.

7.70 The bowsprit may be replaced - e.g. with a rubber bumper.
7.71 The bowsprit must by no means be sharpened.


Download 3x1 sail outline as PDF file>>


Translated into English by Thomas Lehne
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