User talk:Jadias

Welcome!

Hello , and welcome to Wikipedia! Thank you for your contributions. I hope you like the place and decide to stay. Here are some pages that you might find helpful: I hope you enjoy editing here and being a Wikipedian! Please sign your name on talk pages using four tildes ( ~ ); this will automatically produce your name and the date. If you need help, check out Questions, ask me on my talk page, or place  on your talk page and ask your question there. Again, welcome! Dolphin51 (talk) 05:20, 17 December 2008 (UTC)
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Flap (aircraft)
Hi again Jadias!

You made an amendment to Flap (aircraft) on 15 April. Your efforts to improve this article are most welcome.

I can make a couple of comments about your edit. Firstly, in Wikipedia, the titles of articles and sub-headings should begin with a capital letter, but all subsequent words should not begin with a capital letter unless it is essential, such as the surname of a person. You changed "Physics explanation" to "Physics Explanation". The preferred spelling of the word "explanation" is with all lower-case letters.

Secondly, in your edit summary you made the comment that landing flap assists with landing because it increases both lift and drag. I agree that extending wing flaps increases drag (assuming airspeed remains about the same) and I would agree with you if you said that wing flaps increase maximum lift coefficient, but I disagree that extending wing flaps increases lift. Let me give you an example. A fixed-wing aircraft enters the circuit at a weight of 40,000 Newtons with flaps retracted. The aircraft is generating lift of about 40,000 Newtons. The pilot selects approach flap, and then landing flap. The aircraft continues to generate about 40,000 Newtons. Extending wing flaps has neither increased nor decreased lift. (However, stalling speed has progressively reduced as wing flaps have been extended.)

If you want to reply to me, you can do so by answering immediately below my comments here. I will add your Talk page to my watchlist, and I will know when you have added a comment.

Happy editing. Dolphin51 (talk) 05:00, 15 April 2009 (UTC)

Drag on landing
Hi Judias,

To get a steeper approach you have to dump energy there is no other way to do it as otherwise speed increases. The increase in lift does not help at all, in fact it hinders as the aircraft will fly more slowly and this reduces parasitic drag. Would you like to revise your edit please? Thanks MarkC (talk) 05:17, 7 May 2009 (UTC)

Thanks for your reply, but you are still confused. Pitch does not determine flighpath. Descent rrequires potential energy to be lost and a steeper descent requires faster energy loss. Only increased drag can do that (or less thrust=energy input). I am a pilot, and I do this regularly. Cheers MarkC (talk) 14:32, 5 June 2009 (UTC)