Why are thread driven boom vangs new on the market ?
It was very costly to produce special threaded rods before digital temperature controlled processing changed this recently. Former trials using standard trapezoidal threaded rods failed because these rods have much less cross sectional area and therefore bended too easily under pressure forces.

But maximum pulling and pressure forces still differ widely as one can read in the technical descriptions?
This is not quite true anymore. The telescopic part and with it the rod are now supported by 7 sleeves and bearings. This has raised the maximum stability to 4 tons for pressure and pulling forces. Although tests at the National Institute for Material at Garching/Bavaria (s. tearing a Boomtrim) had shown considerable higher pressure limits than we reveal, we are cautious and have set dynamic fatigue strength limits to 2 tons.

But a close hauled main sheet produces also lots of pressure ...
You can damage everything. But because the Boomtrim controls the vertical portion of the main sheet tension, the horizontal force to move the boom towards the center is much less. So it's very notable when you have hauled the boom near the centerline and start applying unnecessary vertical forces also.

And how about the dynamic loads of heavy In-Furl-Booms in rough seas?
It was a challenge to absorb the impact of an 8 meter long, 200 Kg heavy boom dancing up and down for long periods. The new design now houses 30 spring washers which you can configure to cushion up various loads.

Do we need the traveller anymore when using the Boomtrim?
If one can precisely control the vertical forces with the Boomtrim, cruisers don't need the traveller anymore. This eliminates a constant hassle of a stumbling block in the cockpit. On the cabins roof they are usually inefficient while too short , for cruisers they just ad weight, cost and complexity.
Most racing dinghies used to have travellers, but relatively few classes still use them. Instead they have "hoops" (for center mainsheets) or bridles (on the stern), which raises the mainsheet block level with the boom and ensures that the sheet only exerts a lateral pull.

Why don't you offer the Universal-Brackets anymore ?
We have found that Boomtrims are an After Market Product until now. So nearly all customers have already mounted vang brackets. If these are strong enough they are using the existing brackets. This eliminates drilling new holes into sensitive rigging. So we are adapting the clevis parts of the Boomtrims to these brackets. Although we try to have parts on stock for Forespar, SÈLDEN, BAMAR, QuickVang, we manufacture custom clevis for short time delivery.