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Summary: Dagger Napier aircraft Airplane blueprint for the Dagger, Napier ... Aviation history and aircraft blueprints/plans. Napier Dagger: known as the H-24. The H-block has a compact layout, as it essentially consists of two horizontally opposed inline engines lying one atop another. Another advantage is that since the cylinders are opposed, the motion in one is balanced by the opposite motion in the one on the opposite side, leading to very smooth running.
In 1927 the RAE published a seminal study on the concept of the sleeve valve engine. In it they essentially stated that traditional poppet valve engines would likely have a hard time producing much beyond 1,500 hp, a figure many companies were eyeing for next generation engines. In the mid-1930s, Napier set about developing the Dagger into the most powerful engine in the world, by redesigning it with the sleeve valve system and adding water cooling. The H-block layout's inherent balance allowed it to run at higher RPM, to deliver more power from a smaller displacement (more bangs per second means more power delivered); the sleeve valve would allow this higher RPM to be reached.
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