<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd">
<!--  created with Free Online Sitemap Generator www.xml-sitemaps.com  -->
<url>
<loc>https://www.epi-eng.com/</loc>
<lastmod>2026-04-01T16:01:23+00:00</lastmod>
<priority>1.00</priority>
</url>
<url>
<loc>https://www.epi-eng.com/epi_general_information/website_map.htm</loc>
<lastmod>2026-04-01T16:05:20+00:00</lastmod>
<priority>0.80</priority>
</url>
<url>
<loc>https://www.epi-eng.com/epi_general_information/company_background.htm</loc>
<lastmod>2026-04-01T16:05:18+00:00</lastmod>
<priority>0.80</priority>
</url>
<url>
<loc>https://www.epi-eng.com/epi_general_information/whats_new_here.htm</loc>
<lastmod>2026-04-01T16:05:20+00:00</lastmod>
<priority>0.80</priority>
</url>
<url>
<loc>https://www.epi-eng.com/epi_general_information/summary_epi_specialties.htm</loc>
<lastmod>2026-04-01T16:05:20+00:00</lastmod>
<priority>0.80</priority>
</url>
<url>
<loc>https://www.epi-eng.com/mechanical_engineering_basics/mechanical_basics_contents.htm</loc>
<lastmod>2026-04-01T16:07:34+00:00</lastmod>
<priority>0.80</priority>
</url>
<url>
<loc>https://www.epi-eng.com/piston_engine_technology/engine_technology_contents.htm</loc>
<lastmod>2026-04-01T16:08:18+00:00</lastmod>
<priority>0.80</priority>
</url>
<url>
<loc>https://www.epi-eng.com/aircraft_engine_products/aircraft_engine_products_contents.htm</loc>
<lastmod>2026-04-01T16:03:27+00:00</lastmod>
<priority>0.80</priority>
</url>
<url>
<loc>https://www.epi-eng.com/aircraft_engine_conversions/conversions_contents.htm</loc>
<lastmod>2026-04-01T16:04:12+00:00</lastmod>
<priority>0.80</priority>
</url>
<url>
<loc>https://www.epi-eng.com/propeller_reduction_technology/gearbox_technology_contents.htm</loc>
<lastmod>2026-04-01T16:08:47+00:00</lastmod>
<priority>0.80</priority>
</url>
<url>
<loc>https://www.epi-eng.com/gearbox_products/gearbox_products_contents.htm</loc>
<lastmod>2026-04-01T16:06:43+00:00</lastmod>
<priority>0.80</priority>
</url>
<url>
<loc>https://www.epi-eng.com/propeller_technology/propeller_technology_contents.htm</loc>
<lastmod>2026-04-01T16:09:07+00:00</lastmod>
<priority>0.80</priority>
</url>
<url>
<loc>https://www.epi-eng.com/special_purpose_systems/special_purpose_systems_contents.htm</loc>
<lastmod>2026-04-01T16:19:54+00:00</lastmod>
<priority>0.80</priority>
</url>
<url>
<loc>https://www.epi-eng.com/rotorway_helicopter/rotor_drive_system/drive_system_analysis_contents.htm</loc>
<lastmod>2026-04-01T16:19:27+00:00</lastmod>
<priority>0.80</priority>
</url>
<url>
<loc>https://www.epi-eng.com/reference_library/reference_library.php</loc>
<lastmod>2026-04-08T06:25:49+00:00</lastmod>
<priority>0.80</priority>
</url>
<url>
<loc>https://www.epi-eng.com/publications/epi_publications.htm</loc>
<lastmod>2026-04-01T16:09:25+00:00</lastmod>
<priority>0.80</priority>
</url>
<url>
<loc>https://www.epi-eng.com/epi_general_information/interesting_links.htm</loc>
<lastmod>2026-04-01T16:05:19+00:00</lastmod>
<priority>0.80</priority>
</url>
<url>
<loc>https://www.epi-eng.com/epi_general_information/stuff_for_sale.htm</loc>
<lastmod>2026-04-01T16:05:19+00:00</lastmod>
<priority>0.80</priority>
</url>
<url>
<loc>https://www.epi-eng.com/gearbox_products/mark-25_gearbox.htm</loc>
<lastmod>2026-04-01T16:06:46+00:00</lastmod>
<priority>0.80</priority>
</url>
<url>
<loc>https://www.epi-eng.com/special_purpose_systems/ecr_dyno_system.htm</loc>
<lastmod>2026-04-01T16:19:54+00:00</lastmod>
<priority>0.80</priority>
</url>
<url>
<loc>https://www.epi-eng.com/special_purpose_systems/AVL_dyno_gearbox.htm</loc>
<lastmod>2026-04-01T16:19:53+00:00</lastmod>
<priority>0.80</priority>
</url>
<url>
<loc>https://www.epi-eng.com/special_purpose_systems/tpe-331_standby_alternator.htm</loc>
<lastmod>2026-04-01T16:19:55+00:00</lastmod>
<priority>0.80</priority>
</url>
<url>
<loc>https://www.epi-eng.com/special_purpose_systems/t62-powered_oil_drilling.htm</loc>
<lastmod>2026-04-01T16:19:54+00:00</lastmod>
<priority>0.80</priority>
</url>
<url>
<loc>https://www.epi-eng.com/epi_general_information/ceo_resume.htm</loc>
<lastmod>2026-04-01T16:05:18+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/propeller_reduction_technology/gearbox_design_process.htm</loc>
<lastmod>2026-04-01T16:08:46+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/gearbox_products/mark-15_gearbox.htm</loc>
<lastmod>2026-04-01T16:06:45+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/piston_engine_technology/combustion_analysis_technology.htm</loc>
<lastmod>2026-04-01T16:08:16+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/piston_engine_technology/valvetrain_technology_1.htm</loc>
<lastmod>2026-04-01T16:08:21+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/piston_engine_technology/valvetrain_technology_2.htm</loc>
<lastmod>2026-04-01T16:08:21+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/piston_engine_technology/green_energy.htm</loc>
<lastmod>2026-04-01T16:08:19+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/gearbox_products/mark-27_gearbox.htm</loc>
<lastmod>2026-04-01T16:06:46+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/piston_engine_technology/reversing_engine_rotation.htm</loc>
<lastmod>2026-04-01T16:08:20+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/propeller_reduction_technology/chain_drive_issues.htm</loc>
<lastmod>2026-04-01T16:08:45+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/propeller_reduction_technology/belt_drive_properties.htm</loc>
<lastmod>2026-04-01T16:08:45+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/aircraft_engine_conversions/evaluating_a_conversion.htm</loc>
<lastmod>2026-04-01T16:04:13+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/aircraft_engine_conversions/engine_conversions_on_certified_aircraft.htm</loc>
<lastmod>2026-04-01T16:04:12+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/aircraft_engine_products/aircooled_4-cyl_aircraft_engine.htm</loc>
<lastmod>2026-04-01T16:03:27+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/piston_engine_technology/forces_on_recip_components.htm</loc>
<lastmod>2026-04-01T16:08:19+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/special_purpose_systems/rear_engine_midget.htm</loc>
<lastmod>2026-04-01T16:19:54+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/piston_engine_technology/engine_lubrication.htm</loc>
<lastmod>2026-04-01T16:08:18+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/aircraft_engine_products/epi-v-12_engine.htm</loc>
<lastmod>2026-04-01T16:03:32+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/aircraft_engine_products/ls_crate_engines.htm</loc>
<lastmod>2026-04-01T16:03:33+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/piston_engine_technology/crankshaft_design_issues.htm</loc>
<lastmod>2026-04-01T16:08:17+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/aircraft_engine_products/2-stroke_diesel_power.htm</loc>
<lastmod>2026-04-01T16:02:05+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/piston_engine_technology/detonation_and_pre-ignition.html</loc>
<lastmod>2026-04-01T16:08:17+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/piston_engine_technology/engine_mistakes.htm</loc>
<lastmod>2026-04-01T16:08:18+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/propeller_technology/selecting_a_propeller.htm</loc>
<lastmod>2026-04-01T16:09:07+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/propeller_reduction_technology/torsional_vibration_issues.htm</loc>
<lastmod>2026-04-01T16:08:49+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/special_purpose_systems/TA_dyno_system.htm</loc>
<lastmod>2026-04-01T16:19:55+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/mechanical_engineering_basics/clearance_and_tolerance.htm</loc>
<lastmod>2026-04-01T16:07:32+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/piston_engine_technology/bmep_performance_yardstick.htm</loc>
<lastmod>2026-04-01T16:08:16+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/piston_engine_technology/comparison_of_cup_to_f1.htm</loc>
<lastmod>2026-04-01T16:08:16+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/aircraft_engine_conversions/gp_5_reno_racer.htm</loc>
<lastmod>2026-04-01T16:04:13+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/epi_general_information/page_deleted.htm</loc>
<lastmod>2026-04-01T16:05:19+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/gearbox_products/mark-9_gearbox.htm</loc>
<lastmod>2026-04-01T16:06:47+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/aircraft_engine_products/big-block_620_hp.htm</loc>
<lastmod>2026-04-01T16:03:28+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/propeller_reduction_technology/implementation_overview.htm</loc>
<lastmod>2026-04-01T16:08:48+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/propeller_reduction_technology/gear_design.htm</loc>
<lastmod>2026-04-01T16:08:45+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/piston_engine_technology/thermal_efficiency.htm</loc>
<lastmod>2026-04-01T16:08:20+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/piston_engine_technology/power_and_torque.htm</loc>
<lastmod>2026-04-01T16:08:20+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/gearbox_products/mark-9_development_story.htm</loc>
<lastmod>2026-04-01T16:06:47+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/gearbox_products/mark-9_gearbox_ntsb.htm</loc>
<lastmod>2026-04-01T16:06:47+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/piston_engine_technology/electronic_engine_controls.htm</loc>
<lastmod>2026-04-01T16:08:17+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/piston_engine_technology/exhaust_system_technology.htm</loc>
<lastmod>2026-04-01T16:08:19+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/piston_engine_technology/advanced_engine_materials.htm</loc>
<lastmod>2026-04-01T16:08:15+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/piston_engine_technology/turbocharger_technology.htm</loc>
<lastmod>2026-04-01T16:08:21+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/piston_engine_technology/piston_motion_basics.htm</loc>
<lastmod>2026-04-01T16:08:20+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/piston_engine_technology/crankshaft_torsional_absorbers.htm</loc>
<lastmod>2026-04-01T16:08:17+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/piston_engine_technology/engine_bearings.htm</loc>
<lastmod>2026-04-01T16:08:17+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/propeller_reduction_technology/gearbox_technology_intro.htm</loc>
<lastmod>2026-04-01T16:08:47+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/gearbox_products/mark-15_dimensions.htm</loc>
<lastmod>2026-04-01T16:06:45+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/publications/service_bulletin_02.htm</loc>
<lastmod>2026-04-01T16:09:27+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/rotorway_helicopter/rotor_drive_system/epi_secondary_inspection.htm</loc>
<lastmod>2026-04-01T16:19:28+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/rotorway_helicopter/rotor_drive_system/autorotation_clutch.htm</loc>
<lastmod>2026-04-01T16:19:27+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/aircraft_engine_products/epi_gen-2_aircraft_engine.htm</loc>
<lastmod>2026-04-01T16:03:32+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/propeller_reduction_technology/gearbox_faq.htm</loc>
<lastmod>2026-04-01T16:08:46+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/propeller_reduction_technology/gearbox_summary.htm</loc>
<lastmod>2026-04-01T16:08:46+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/aircraft_engine_conversions/big-block_on_air_tractor.htm</loc>
<lastmod>2026-04-01T16:04:11+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/rotorway_helicopter/rotor_drive_system/known_secondary_failures.htm</loc>
<lastmod>2026-04-01T16:19:28+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/rotorway_helicopter/rotor_drive_system/prodrive_overload.htm</loc>
<lastmod>2026-04-01T16:19:30+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/rotorway_helicopter/rotor_drive_system/gates_belt_issues.htm</loc>
<lastmod>2026-04-01T16:19:28+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/rotorway_helicopter/rotor_drive_system/prodrive_belt_system.htm</loc>
<lastmod>2026-04-01T16:19:30+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/mechanical_engineering_basics/stress_and_strain.htm</loc>
<lastmod>2026-04-01T16:07:34+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/mechanical_engineering_basics/fatigue_in_metals.htm</loc>
<lastmod>2026-04-01T16:07:33+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/aircraft_engine_products/epi_gen-1_aircraft_engine.htm</loc>
<lastmod>2026-04-01T16:03:32+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/mechanical_engineering_basics/velocity_and_acceleration.htm</loc>
<lastmod>2026-04-01T16:07:35+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/mechanical_engineering_basics/force_and_friction.htm</loc>
<lastmod>2026-04-01T16:07:33+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/mechanical_engineering_basics/fretting_corrosion.htm</loc>
<lastmod>2026-04-01T16:07:33+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/mechanical_engineering_basics/durability_of_rolling_element_bearings.htm</loc>
<lastmod>2026-04-01T16:07:32+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/gearbox_products/mark-14_gearbox.htm</loc>
<lastmod>2026-04-01T16:06:45+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/gearbox_products/mark-16_gearbox.htm</loc>
<lastmod>2026-04-01T16:06:45+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/rotorway_helicopter/rotor_drive_system/secondary_shaft_fea_results.htm</loc>
<lastmod>2026-04-01T16:19:31+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/rotorway_helicopter/rotor_drive_system/secondary_shaft_failure_digest.htm</loc>
<lastmod>2026-04-01T16:19:31+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/rotorway_helicopter/rotor_drive_system/main_v-belt_drive.htm</loc>
<lastmod>2026-04-01T16:19:29+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/rotorway_helicopter/rotor_drive_system/main_rotor_chain_drive.htm</loc>
<lastmod>2026-04-01T16:19:29+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/rotorway_helicopter/rotor_drive_system/secondary_shaft_bearing_issues.htm</loc>
<lastmod>2026-04-01T16:19:30+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/propeller_technology/propeller_damage_issues.htm</loc>
<lastmod>2026-04-01T16:09:06+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/aircraft_engine_products/demise_of_avgas.htm</loc>
<lastmod>2026-04-01T16:03:28+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/aircraft_engine_conversions/prime_directive.htm</loc>
<lastmod>2026-04-01T16:04:14+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/aircraft_engine_conversions/engine_mount_design.htm</loc>
<lastmod>2026-04-01T16:04:13+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/aircraft_engine_conversions/whirl_mode.htm</loc>
<lastmod>2026-04-01T16:04:15+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/mechanical_engineering_basics/energy_and_work.htm</loc>
<lastmod>2026-04-01T16:07:32+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/mechanical_engineering_basics/power_and_torque.htm</loc>
<lastmod>2026-04-01T16:07:34+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/mechanical_engineering_basics/vibration_intro.htm</loc>
<lastmod>2026-04-01T16:07:35+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/mechanical_engineering_basics/torsional_vibration_intro.htm</loc>
<lastmod>2026-04-01T16:07:34+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/mechanical_engineering_basics/transmissibility.htm</loc>
<lastmod>2026-04-01T16:07:35+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/mechanical_engineering_basics/introduction_to_chemistry.htm</loc>
<lastmod>2026-04-01T16:07:34+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/piston_engine_technology/volumetric_efficiency.htm</loc>
<lastmod>2026-04-01T16:08:21+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/piston_engine_technology/engine_comparison_tools.htm</loc>
<lastmod>2026-04-01T16:08:18+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/piston_engine_technology/torsional_excitation_from_piston_engines.htm</loc>
<lastmod>2026-04-01T16:08:20+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/aircraft_engine_products/engine_project_overview.htm</loc>
<lastmod>2026-04-01T16:03:28+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/aircraft_engine_conversions/engine_conversions_intro.htm</loc>
<lastmod>2026-04-01T16:04:12+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/aircraft_engine_conversions/more_conversion_criteria.htm</loc>
<lastmod>2026-04-01T16:04:14+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/aircraft_engine_conversions/spacewalker-2_engine_mount.htm</loc>
<lastmod>2026-04-01T16:04:15+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/aircraft_engine_conversions/orenda_on_air_tractor.htm</loc>
<lastmod>2026-04-01T16:04:14+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/aircraft_engine_conversions/orenda_on_aero_commander.htm</loc>
<lastmod>2026-04-01T16:04:14+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/propeller_reduction_technology/gearbox_load_model.htm</loc>
<lastmod>2026-04-01T16:08:46+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/propeller_reduction_technology/superior_spur_gears.htm</loc>
<lastmod>2026-04-01T16:08:49+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/propeller_reduction_technology/shaft_and_housing_loads.htm</loc>
<lastmod>2026-04-01T16:08:49+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/propeller_reduction_technology/bearing_loads.htm</loc>
<lastmod>2026-04-01T16:08:45+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/propeller_reduction_technology/lubrication_and_cooling.htm</loc>
<lastmod>2026-04-01T16:08:48+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/propeller_reduction_technology/governor_drive_issues.htm</loc>
<lastmod>2026-04-01T16:08:47+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/propeller_reduction_technology/prop_rotation_direction_issues.htm</loc>
<lastmod>2026-04-01T16:08:48+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/propeller_reduction_technology/sprag_clutch_misuse.htm</loc>
<lastmod>2026-04-01T16:08:49+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/gearbox_products/mark-10_gearbox.htm</loc>
<lastmod>2026-04-01T16:06:44+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/gearbox_products/mark-11_gearbox.htm</loc>
<lastmod>2026-04-01T16:06:44+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/gearbox_products/mark-12_gearbox.htm</loc>
<lastmod>2026-04-01T16:06:44+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/gearbox_products/mark-17_gearbox.htm</loc>
<lastmod>2026-04-01T16:06:46+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/gearbox_products/mark-18_gearbox.htm</loc>
<lastmod>2026-04-01T16:06:46+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/propeller_technology/propeller_vibration_issues.htm</loc>
<lastmod>2026-04-01T16:09:07+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/rotorway_helicopter/rotor_drive_system/background.htm</loc>
<lastmod>2026-04-01T16:19:27+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/rotorway_helicopter/rotor_drive_system/rotor_drive_system_model.htm</loc>
<lastmod>2026-04-01T16:19:30+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/rotorway_helicopter/rotor_drive_system/engine_vibration.htm</loc>
<lastmod>2026-04-01T16:19:28+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/rotorway_helicopter/rotor_drive_system/main_rotor_drive_dynamics.htm</loc>
<lastmod>2026-04-01T16:19:29+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/rotorway_helicopter/rotor_drive_system/system_vibration_properties.htm</loc>
<lastmod>2026-04-01T16:19:31+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/rotorway_helicopter/rotor_drive_system/secondary_shaft_metallurgy.htm</loc>
<lastmod>2026-04-01T16:19:31+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/rotorway_helicopter/rotor_drive_system/secondary_shaft_loads.htm</loc>
<lastmod>2026-04-01T16:19:31+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/rotorway_helicopter/rotor_drive_system/secondary_shaft_fatigue.htm</loc>
<lastmod>2026-04-01T16:19:30+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/rotorway_helicopter/rotor_drive_system/engine_issues.htm</loc>
<lastmod>2026-04-01T16:19:28+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/publications/service_bulletin_01.htm</loc>
<lastmod>2026-04-01T16:09:27+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/publications/service_bulletin_03.htm</loc>
<lastmod>2026-04-01T16:09:27+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/publications/mark-9_installation.htm</loc>
<lastmod>2026-04-01T16:09:26+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/publications/rw-sec-upgrd.html</loc>
<lastmod>2026-04-01T16:09:27+00:00</lastmod>
<priority>0.64</priority>
</url>
<url>
<loc>https://www.epi-eng.com/propeller_reduction_technology/220010-E-High%20Strength%20300M%20Parts-public.pdf</loc>
<lastmod>2025-09-07T23:25:09+00:00</lastmod>
<priority>0.51</priority>
</url>
<url>
<loc>https://www.epi-eng.com/aircraft_engine_products/epi-v-12_engine-04-RodsPistons.htm</loc>
<lastmod>2026-04-01T16:03:29+00:00</lastmod>
<priority>0.51</priority>
</url>
<url>
<loc>https://www.epi-eng.com/aircraft_engine_products/epi-v-12_engine-01-Constraints.htm</loc>
<lastmod>2026-04-01T16:03:29+00:00</lastmod>
<priority>0.51</priority>
</url>
<url>
<loc>https://www.epi-eng.com/aircraft_engine_products/epi-v-12_engine-02-Block-Liners.htm</loc>
<lastmod>2026-04-01T16:03:29+00:00</lastmod>
<priority>0.51</priority>
</url>
<url>
<loc>https://www.epi-eng.com/aircraft_engine_products/epi-v-12_engine-03-Crankshaft.htm</loc>
<lastmod>2026-04-01T16:03:29+00:00</lastmod>
<priority>0.51</priority>
</url>
<url>
<loc>https://www.epi-eng.com/aircraft_engine_products/epi-v-12_engine-05-Valvetrain.htm</loc>
<lastmod>2026-04-01T16:03:30+00:00</lastmod>
<priority>0.51</priority>
</url>
<url>
<loc>https://www.epi-eng.com/aircraft_engine_products/epi-v-12_engine-06-CylHd.htm</loc>
<lastmod>2026-04-01T16:03:30+00:00</lastmod>
<priority>0.51</priority>
</url>
<url>
<loc>https://www.epi-eng.com/aircraft_engine_products/epi-v-12_engine-07-IntakeFuel.htm</loc>
<lastmod>2026-04-01T16:03:30+00:00</lastmod>
<priority>0.51</priority>
</url>
<url>
<loc>https://www.epi-eng.com/aircraft_engine_products/epi-v-12_engine-08-Lube.htm</loc>
<lastmod>2026-04-01T16:03:31+00:00</lastmod>
<priority>0.51</priority>
</url>
<url>
<loc>https://www.epi-eng.com/aircraft_engine_products/epi-v-12_engine-09-Cooling.htm</loc>
<lastmod>2026-04-01T16:03:31+00:00</lastmod>
<priority>0.51</priority>
</url>
<url>
<loc>https://www.epi-eng.com/aircraft_engine_products/epi-v-12_engine-10-Boost.htm</loc>
<lastmod>2026-04-01T16:03:31+00:00</lastmod>
<priority>0.51</priority>
</url>
<url>
<loc>https://www.epi-eng.com/aircraft_engine_products/epi-v-12_engine-11-Gears.htm</loc>
<lastmod>2026-04-01T16:03:31+00:00</lastmod>
<priority>0.51</priority>
</url>
<url>
<loc>https://www.epi-eng.com/gearbox_products/mark-9_pictures.htm</loc>
<lastmod>2026-04-01T16:06:47+00:00</lastmod>
<priority>0.51</priority>
</url>
</urlset>