218 G. J. Wennagel 
Table 2 
Marinization Changes to the YT-58-2 Engine 
Engine Rees ee Material and Coating or 
Dash No.* 8 Specification No. Treatment 
102 and 101 | Front Frame Magnesium Nubelon S 
AMS 4434 
102 and 101 | Compressor Casing Steel, G. E. Nickel Plate 
_ SAED B50T1131 
102 and 101 | Compressor Rear Frame Steel, G. E. Nickel Plate 
SAED B50T1131 
102 Compressor Spool & Blade Assy Steel Nubelon S 
AMS 6451 
102 and 101 | Compressor Sta. Vanes & Rings Steel 
AISI 405 
Stages | thru 7 Nubelon S 
Stages 8 and 9 Heresite 
Stage 10 and Exit Vanes Silicone Alum. 
102 and 101 | Combustion Chamber Casing Steel, G. E. Nickel Plate 
SAED B50T1131 
101 Variable Stator Actuating Rings Steel Chrome Plate 
AISI 410 
101 Variable Stator Actuator Levers Steel Nickel Plate 
AMS 5120 ' 
101 Main Reduction Gear Case Magnesium Replace with 
AMS 4434 Aluminum, 
Alodine 
101 All Magnesium Engine Components | Magnesium Replace with 
AMS 4434 Aluminum, 
Alodine 
Compressor Spool Steel Nubelon S 
AM-355 
*This column identifies the changes as applying to the second engine, No. SN-200-102, or to the 
third engine, No. SN-200-101. 
A third engine, No. SN-200-101, is being modified for later installation and test. It 
includes all of the coatings incorporated in the second engine, with additional changes as 
given in Table 2. It is hoped that this engine, after test-stand operation and waterborne 
service with suitable operating procedures, will represent a final marinization of the 
YT-58-2 engine. 
PROPELLER 
The propeller is located on the aft end of the propeller pod behind the tail foil and 
strut. It has been designed and manufactured by personnel of the David Taylor Model Basin 
for zero cavitation number and in accordance with the DTMB three-bladed, supercavitating 
propeller series. This series is fully described in Refs 1-3. Propeller diameter is 10.0 
inches; pitch ratio at the 70.0 percent radius is 1.61; expanded area ratio is 0.457; blade 
thickness fraction is 0.024; rotation is clockwise looking forward. Propeller material is 
