The STF is the working tension in the strap created when the lashing is ratcheted down over the load. It’s only used to calculate the number of lashings needed in frictional lashing. The example shown was made about 30 years ago of Honduras mahogany. For reasons of maintenance, oiled teak is preferable. Varnished wood simply wasn’t made for cradling heavy chunks of metal.

Step 3:With a drill and proper bit, create a hole on each end of the second piece of lumber for your screws to attach to the first piece at an angle (about 20 degrees). The LC is the maximum force the lashing can safely withstand without damage when pulled in a straight line. It’s only used to calculate the number of lashings needed in direct lashing. Standard tension force (STF) Yes. I used to work in a boatyard and you will be amazed at how much hull deflection you can get on some boats, and more so with the modern stuff as much of it seems to be much lighter in construction than the older boats. Straps used in the UK usually have an STF of 350daN or lower. For some loads, you may need to use straps with an STF of 500daN or more to reduce the number of lashings required. Other information on the strapDon't worry about the bow and stern props until the end just before the belts get dropped away from the hull. Positive fit is a way of securing a load inside a trailer or vehicle body that’s strong enough to withstand the forces likely to be exerted on it during the journey, for example a vehicle or trailer constructed to the BS EN 12642 XL standard. direct - where one end of the lashing is attached to the load and the other end is attached to the vehicle or trailer

a high-friction surface with a certified coefficient of friction is used between the load and load bed Cut out the wood; then lay the an-chor on the two pieces and, lining up on the centerline, mark the positions of the crown, fluke, and shank recesses. Most ratchet straps used in the UK have a label attached to them with information about their strength and how they can be used. You must secure any divisible load that is higher than the headboard. You can use additional lashings to stop the load moving forward when the vehicle brakes. Indivisible loads

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Make sure you use enough lashings to prevent load movement under normal driving conditions. If there is a serious load shift, enforcement agencies will refer to BS EN 12195 1: 2010 Load restraining on road vehicles Safety Part 1: Calculation of securing forces when deciding if you have used enough lashings. inspect any straps involved in a load shift incident - do not use them if they’re worn or damaged, even if the damage appears to be minor If the end is too small, do not use it on your tire and discard it. You will need a larger piece for this step. If you decide to do the calculation yourself, you must use a coefficient of friction of 0.2 in the calculation unless:

I 'think' your cradle will be alright, if used in conjunction with wooden props. You can always strap the hull to the cradle as well to stiffen it up a bit, but not essential.

A divisible load is a load that can be broken down into multiple smaller parts, such as a bundle of pipes or bars.