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----- Original Message ----- From: "Ernest Christley" <echristley@nc.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Friday, May 20, 2005 2:13 PM
Subject: [FlyRotary] Re: Sized 13b
Ed Anderson wrote:
Plugs Up itself was not the problem, inadequate understanding or attention to the details of lubrication subsystem was the problem. Dave now uses one of powersports spur gear PSRUs, the one that weights 65 lbs and cost $6500. He apparently went through several Ross drives and having gone through one myself I can understand - although not agree - with his views concerning the planetary drive. Simply a less than adequate design as embodied in the Ross drive. Tracy's drive is a different breed of cat altogether.
Goes back to something you said last Saturday. You said it off-handedly, but it really carries a lot of weight and import. I can't quote it exactly, so I'll paraphrase:
If you're going to copy a system, you have to copy it exactly. Any changes makes it a different system. Then you have to go back to the basics and actually understand how the system works.
Boy! good memory, Ernest.
Yes, I guess if there is anything that I feel somewhat strongly about is folks who "copy" someone else's system - but, don't really copy it and then are surprised because it did not work (or work well). Unless you copy it exactly - you have not copied it, you have a different system and sometimes one seemingly "small" change can make a world of difference. Or if your operating environment is different then two identical systems may not function similarly.
That is one hunk of a PSRU you are working on Ernest - have you calculated how it would affect your W&B?
Ed A
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