The appearance of new helicopters conceived from the beginning to be powered by a turbine such as the Bell 204/205 (UH-1 Huey) made the S-58, which represented in a certain sense the apex of the evolution of medium transport helicopters with piston engines, soon obsolete.

The Sikorsky H-34 (company designation S-58) is an American piston-engined military utility helicopter originally designed by Sikorsky as an anti-submarine warfare (ASW) aircraft for the United States Navy.

In 1970, Sikorsky set up a production line to remanufacture S-58 aircraft to the S-58T configuration which included replacing the R-1820-84 Radial engine with a Pratt & Whitney Canada PT-6-3 Twin-Pac® Turbine engine.

Westland Helicopters also developed a turbine-powered helicopter from the S-58 airframe: the first Westland Wessex HAS.1 for the Royal Navy fitted with a Napier Gazelle turboshaft first flew on June 20, 1958. Westland built a total of 356 Wessex helicopters in the various versions.

Jan 24, 2024 · Good comparison shots and cool the S58 is MHI. The OE S55 "base" setup is no slouch and has some good potential for upgrades. I'd say our S55 Stage 2 based offering still has a bit of a nudge on the OE S58 setup.

Sep 26, 2021 · The BMW S58 is an incredible engine capable of making 750+whp on stock turbos with basic bolt-on mods. Among the best bolt-on upgrades are a set of catless or high-flow catted downpipes. Upgraded downpipes help reduce backpressure and improve turbo spool, which results in impressive performance gains.

The S58 offered an extensive fuselage and lifting limit, yet its cylinder motor made it costly to work. In 1970 Sikorsky proclaimed it was creating a turboprop transformation bundle for the S58. Turboprop controlled S58s are assigned the S58t and were at first fueled by a 1340kw (1800shp) Pratt & Whitney Pt6t3, later air ship a 1400kw (1875shp ...

The S58 offered a very large fuselage and lifting capacity, but its piston engine made it expensive to operate. In 1970 Sikorsky announced it was developing a turboprop conversion package for the S58.

Mar 23, 2021 · The Sikorsky S-58 (or H-34 if you're in the army) was designed in the mid 1950s. This was a time right before turbine engines started to appear on helicopters such as the UH-1 Huey for example.

S58￿Engine 1.￿Introduction 6 Index Explanation 5 Crankshaft￿drive 6 Sump￿gasket 7 Oil￿supply 8 Oil￿sump 1.2.2.￿Comparison￿of￿S58￿engine￿and￿B58TU￿engine Engine￿mechanics Component New1 Same2 Comment Cylinder￿head￿cover Adapted￿to￿two￿high￿pressure￿pumps Adapted￿crankcase￿ventilation Cylinder￿head