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mantafs(at)earthlink.net
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 Posted: Thu Sep 26, 2013 6:23 am Post subject: Horizontal Tail Span |
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Rich being the owner and business person and not an engineer may have made changes based more on business reasons than engineering. As Mark T. said the TR-4 used the same elevator control horn as the TR-1 for parts commonality. This did limit the elevator up travel so instead of changing the part as required for engineering reasons maybe he changed the specification for business reasons.
On Bill's plane, that was the second factory TR-4 demonstrator, Vance made a custom longer elevator horn to allow the full +25. Vance thought that this was important. So did I both at the time and today. But keep in mind that a longer elevator horn reduce the stick force per G and it is already too low. It also increased the stick throw and this was an issue in Bill's TR-4.
Keep in mind that no product is perfect from an engineering perspective. All products including aircraft must be a compromise and this compromise includes many aspects including time, cost, looks, marketing, engineering, etc. Like any aircraft the TR-1 and TR-4 are not perfect. They are acceptable to many people as designed. As an engineer that worked on these aircraft I think there are some things that are easy to change that make them much better. These changes reduce pilot workload, make them safer and improve overall performance.
Mark
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mantafs(at)earthlink.net
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| Posted: Thu Sep 26, 2013 6:44 am Post subject: Horizontal Tail Span |
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Hi Mark T.,
I also miss Vance and talking engineering with him. He was even right some of the time;)
There is a NACA 65 415 airfoil even if it is not in Abbott and Van Doenhoff. It is used on the Piper Cherokee and others. http://airfoiltools.com is a great resource.
Mark K.
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