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Hughes 500 - Regular Tail Versus T-Tail  
User currently offline2H4 From United States of America, joined Oct 2004, 8955 posts, RR: 59
Posted (4 years 2 months 3 days 4 hours ago) and read 5704 times:
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After the Hughes 500 had been in production for a number of years, the tail was changed to a "T-tail" design:


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What are the benefits to the T-tail? Are there any drawbacks compared to the old design?


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User currently offlineoly720man From United Kingdom, joined May 2004, 6737 posts, RR: 11
Reply 1, posted (4 years 1 month 4 weeks 1 day 16 hours ago) and read 5510 times:

I expect a Hughes insider will be needed for this one. I have no idea of the design/aerodynamic compromises that go into helicopter tail designs

Given that the 500D with the T tail was about 50% heavier than the 500C with a bigger engine and 5 bladed rotor rather than a 4 bladed rotor I imagine that there are quite a few issues that are involved.

The lateral surfaces are, I would assume, of main benefit in the cruise and some dynamic pitch stability in the hover/low speed with the angled surface on the C contributing something to yaw, something that a more effective tail rotor on the -D may compensate for. The position of the top of the T may put it in a cleaner airflow than the lower mounted surface on the -C, but I expect such info is proprietary.



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