Bootswerft Streamline Information, Review, Specs

Sailing Performance & Handling

The Streamline is defined by its exceptional power-to-weight ratio and its pedigree as a Judel/Vrolijk design. With a displacement of approximately 600 kilograms and a significant portion of that weight concentrated in a torpedo-shaped lead bulb, the boat exhibits a high degree of "stiffness" despite its narrow, slippery hull form. On the wind, the Streamline tracks with the precision of a match-racer, benefitting from a high-aspect-ratio carbon rig that minimizes windage and weight aloft.

The true character of the vessel emerges on downwind legs. Equipped with a retractable carbon bowsprit and a large asymmetric gennaker, the Streamline transitions quickly from displacement mode to a stable plane. Handling is reported to be sensitive yet forgiving; the large rudder provides enough bite to prevent "spin-outs" during heavy-air gybes, a common issue in lighter sportsboats. Technical reviewers often note that the boat feels like a "miniature TP52," offering a tactical racing experience where subtle trim adjustments result in immediate feedback. The absence of a backstay allows for a modern, square-top mainsail, further enhancing its performance in light-to-moderate air.

Popular Mentions & Media

While the Streamline has maintained a specialized niche, it is a fixture of the Central European racing scene, particularly on the Alpine lakes of Germany, Austria, and Switzerland. It gained significant attention within the sailing press at its launch for being one of the first production "sportsboats" to successfully integrate an all-carbon rig as standard equipment. The boat is frequently featured in regatta coverage from the Lake Starnberg and Lake Constance circuits, where it competes in dedicated one-design fleets. Its reputation for durability has also seen it used in high-level match racing clinics, as the boat's responsiveness makes it an ideal platform for teaching advanced tactical positioning and asymmetric spinnaker handling.

Known Issues & Buyer’s Checklist

Prospective owners of a pre-owned Mader Streamline should focus their inspection on the high-load areas inherent to a lightweight racing machine.

• Keel Attachment and Trunk: Because the Streamline features a deep lifting keel for easy trailering, the trunk and the locking mechanism should be inspected for stress fractures or "play." Wear in the keel guides can lead to humming or vibration at high speeds.
• Carbon Mast Integrity: The carbon rig is a performance highlight but requires scrutiny. Check for UV degradation of the clear coat and any signs of splintering or compression around the spreaders and the mast base.
• Deck Hardware Bedding: Given the high tension of the asymmetric spinnaker, the blocks and the retractable bowsprit housing are prone to hairline crazing in the gelcoat. Ensure that the core remains dry and that hardware has been re-bedded if any movement is detected.
• Rudder Bearings: As an open boat with high helm sensitivity, any slop in the rudder bearings will significantly degrade the sailing experience. Check for lateral movement when the blade is down.

Community & Resources

The Streamline remains supported by a dedicated class association that governs its one-design rules, ensuring that older boats remain competitive with newer builds. The Streamline Class Association (Streamline-Klasse) is the primary resource for technical manuals, tuning guides, and the annual regatta calendar. Because Mader continues to produce the boat and its components, technical support and replacement parts—ranging from specialized hull fittings to carbon spars—are readily available directly from the shipyard in Waging am See.

The Verdict

The Mader Streamline is an uncompromising racing tool that trades interior volume for pure, unadulterated speed. It is an ideal choice for the competitive sailor who values German engineering and the tactical nuances of a three-person keelboat.

Pros:

• Exceptional Build Quality: Vacuum-infused epoxy construction provides a stiff, long-lasting hull.
• High Performance: Plans easily and offers dinghy-like responsiveness with keelboat stability.
• Trailability: The lifting keel and lightweight design make it easy to transport to various regattas.
• One-Design Integrity: Strict class rules preserve the value and competitiveness of the fleet.

Cons:

• Strictly a Daysailer: Total lack of interior amenities makes it unsuitable for anything beyond racing or day trips.
• Wet Ride: The low freeboard and high speeds mean the crew will frequently encounter spray in heavy conditions.
• Crew Dependent: Requires a coordinated three-person team to handle the large sail area effectively in a breeze.