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Selden world renowned design and engineering prowess culminates in an outstanding rigging hardware upgrade for cruising and performance yachts.
The Selden Rodkicker is a boom support system comprising a telescopic anodised aluminium extrusion with thrust absorbing bushes, an optional lifting gas spring, end brackets for attaching to the boom and mast sections, and a flexible wire starting point for the kicking strap.
A rodkicker without gas spring prevents the boom from dropping dangerously in the event of a topping lift failure, during mainsail reefing or dropping.
However, the benefits are much greater with a gas spring fitted because of the lifting moment it provides.
90% or more of the rodkickers that we sell are with the gas spring option.
Selden Rodkicker Benefits and Features:
Selden Rodkicker Plus Factors with Gas Spring fitted:
There are three strength options for the gas spring : Normal, Hard or Extra Hard.
The correct spring for your rig will depend on the model, the weight of the boom and the rodkicker angle.
Consult the Selden Guide (see link at the bottom of this page) and if you are still not confident which spring you require, the Jimmy Green Rigging Team are always on hand to help you make the correct selection for your rig.
Max. Righting Moment | Fractional Rig | 12.5 kNm |
---|---|---|
Masthead Rig | 15 kNm | |
Max. Displacement | Fractional Rig | 2.5 tonnes |
Masthead Rig | 3.9 tonnes |
The blocks and the line which make up the kicking strap tackle are not included in the Rodkicker, but the flexible stainless steel wire that runs from the bottom of the rod around the top sheave culminating in a free end (made off with a stainless steel thimble eye) does come as part of the kit.
Either the existing vang or a new tackle system should be connected to the eye on the end of the wire at the top and shackleded to the protruding lug at the bottom.
Universal, as well as Selden specific, boom and mast brackets are available if the rodkicker ends do not fit straight on to your existing kicking strap attachment points.
The Jimmy Green Rigging Sales Team are on hand to help you find the correct part number.
The wire creates a 2:1 purchase which doubles the power of your existing vang, and also reduces the load by 50%
This means that your existing kicking strap blocks and control line should have the required specification to continue in service (subject to an adjustment in length) because they should be stronger than the Selden recommendation.
You can check the required block sizes on the charts below.
A study of the Selden charts confirms that their recommended specification for the blocks on the Kicking Strap is higher than those for the Rodkicker Tackle.
This is due to the integral wire part of the rodkicker which reduces the load on the tackle by 50%.
The Selden Rodkicker sizing recommendations are based on a combination of Yacht Length Overall and Righting Moment calculated at 30% of heel.
Righting moment is a measure of a yacht's ability to carry sail and is approximately proportional to displacement.
Selden use the righting moment of a yacht as a major factor in their recommended specifications right across their range of rigging applications and hardware, so it is extremely useful to know the answer for your own yacht.
You will need to enter your Beam in mm, Draft in mm, Displacement in kg, Ballast in kg, whether it has a bulb or wing keel and the number of crew members normally on the rail:
Selden Righting Moment Calulator
There are two sizing charts: 1. Fractional Rig and 2. Masthead Rig:
Rodkicker Model | Maximum Righting Moment | Maximum Displacement | Current Selden Boom Section | Previous Selden/Kemp Boom Section | Boom Height | Minimum Length | SWL |
---|---|---|---|---|---|---|---|
Type 05 Standard | 12.5kNm | 2.5 tonnes | B087-B120 | 86/59-111/75 | < 900mm | 1150mm | 8kN |
Type 10 Standard | 25kNm | 5 tonnes | B087-B152 | 86/59-111/75, 128/90 | ≤ 1100mm | 1360mm | 12kN |
Type 10 Long | 25kNm | 5 tonnes | B087-B152 | 86/59-111/75, 128/90 | > 1100mm | 1670mm | 12kN |
Type 20 Standard | 50kNm | 9 tonnes | B171-B200 | 150/105-189/132, 206/139 | ≤ 1400mm | 1720mm | 18kN |
Type 20 Long | 50kNm | 9 tonnes | B171-B200 | 150/105-189/132, 206/139 | > 1400mm | 2260mm | 18kN |
Type 30 Standard | 120kNm | 20 tonnes | B200-B250 | x | ≤ 1800mm | 2200mm | 38kN |
Type 30 Long | 120kNm | 20 tonnes | B200-B250 | x | > 1800mm | 2700mm | 38kN |
Rodkicker Model | Maximum Righting Moment | Maximum Displacement | Current Selden Boom Section | Previous Selden/Kemp Boom Section | Boom Height | Minimum Length | SWL |
---|---|---|---|---|---|---|---|
Type 05 Standard | 15kNm | 3.9 tonnes | B087-B120 | 86/59-111/75 | < 900mm | 1150mm | 8kN |
Type 10 Standard | 35kNm | 6 tonnes | B087-B152 | 86/59-111/75, 128/90 | ≤ 1100mm | 1360mm | 12kN |
Type 10 Long | 35kNm | 6 tonnes | B087-B152 | 86/59-111/75, 128/90 | > 1100mm | 1670mm | 12kN |
Type 20 Standard | 70kNm | 11 tonnes | B171-B200 | 150/105-189/132, 206/139 | ≤ 1400mm | 1720mm | 18kN |
Type 20 Long | 70kNm | 11 tonnes | B171-B200 | 150/105-189/132, 206/139 | > 1400mm | 2260mm | 18kN |
Type 30 Standard | 160kNm | 25 tonnes | B200-B250 | x | ≤ 1800mm | 2200mm | 38kN |
Type 30 Long | 160kNm | 25 tonnes | B200-B250 | x | > 1800mm | 2700mm | 38kN |
Boom Height is denoted and measured as per XBH, see image below
SWL = Selden Safe Working Load
There is more detailed information from Selden on sizing. Selden Rodkicker Information and Size Guide
If you are still uncertain which model and/or gas spring is best suited to your yacht, please contact the Jimmy Green Rigging Sales Team with your yacht details for a reassuring check by the Selden experts.