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    My 13B engine configuration (tentative)

    The Ross prop shafts were in two pieces. The flange was press fitted to the shaft and then pinned. That design made disassembly of the unit difficult without special equipment. Lou Ross was a master of masters at machining technique. His son, when he took over, when Lou retired, was not as...
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    My 13B engine configuration (tentative)

    Tracy's prop shafts were fabricated from a vehicle rear axle. I don't think he ever told us what vehicle. Aubrey
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    My 13B engine configuration (tentative)

    My interest here is in promoting the rotary for use by the broader aviation community. My comments are not directed at dwalker's specific implementation. In general, the rotary community needs an off the shelf PSRU to replace Tracy's product. Aubrey
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    My 13B engine configuration (tentative)

    The C6 hd size gearing has been successfully operated at takeoff power levels of 250 to 300 HP by Tracy and others. So, it may be reasonable to set 300 HP as the maximum power for a Low Power design. The Mistral gear box was designed for 1000 HP maximum. So, I think it would be reasonable to...
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    My 13B engine configuration (tentative)

    I think it would be useful to divide the discussion between a Low Power PSRU, using C6 hd size gearing, and a High Power PSRU, using diesel truck transmission gearing. The truck transmission gear sets are typically 5" to 6" in diameter compared to 3" to 4" for the C6 sets.
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    My 13B engine configuration (tentative)

    Guys, RV7Charlie is correct, to achieve full utilization of the rotary it should spin at around 7500 RPM at takeoff. So, a PSRU ratio of around 3.0 : 1 is optimum. Mistral, when designing from scratch, chose a ratio of 3.2 to 1. The Mistral drive had straight cut gearing. Copy success. Aubrey
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    My 13B engine configuration (tentative)

    Hi dwalker, I'm the guy (Aubrey Thompson) who has been doing the Rotary Engines for Aircraft forums at Sun N Fun for the past four or five years since Paul Lamar stopped doing them. I've advocated that any experimental engine system MUST include robust data logging that can be studied between...
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