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  1. Thanks. This is very helpful!

  2. A distinction between pressure and force will help to understand this article; the author uses “pressure” when “force” is the proper word.

  3. Nice job. Like most things in life the smoother they work the better they look and work. Servos are like the muscles in your arm. If you try to lift something at the wrong angle something is going to get hurt. Keep it smooth.

  4. #1 Thank you for all of the good info. #2 Richard don’t be a butt , when I see your name on top of an article I might waste 10 seconds to learn all you know about this hobbie.

  5. I have very solid understanding of mechanical action, but it always helps to get back to the simple, basic things. This made me think about my approach a little differently. I love it when I learn something. (Even the difference between force and pressure. lol Gotta keep it light folks.

  6. Debra,

    Your article is an excellent one; simple, to the point, and really easy to follow. Thanks for your help, keep up your smooth stile.

  7. ‘Your article is an excellent one …’. I agree 100% however, the distinction between pressure and Force is critical to the explanation of end result as the deflection made at the control surface interface. Even more important is the explanation covered by Figure,s 2, 3 & 4 as they relate directly to obtaining ‘maximum power and resolution to that control surface’. This has been an ongoing mental exercise to me lately as I have been trying to set a new computer programmable transmitter (DX7S) with adjustable end points and excursions. Great help. Wish I had seen this article months ago.

  8. I enjoyed reading your article. It was very informative to me. Where can I go to get more information regarding setting up model airplanes components?

  9. I respect and appreciate your detailed explanation of the servo.

    I have a question. I am in the process of building a “PBY – by Robert Sweitzer” design.

    For tip floats, I am using nut and spindle design with a continuos rotation servo, this

    requires about three inches of travel.

    Back to the question, what is your suggestion about getting this three inches of travel?

    I am using a 1/4″ spindle with 6 threads per inch, for this set-up.

    Any ideas or suggestion would be greatly appreciated. Thanks.


  10. I am building a plane and this article gave me a new insight about servo and linkage.

  11. There is a problem with Debra’s recommendation regarding link geometry in fig 4 –
    Yes, the servo will have better leverage at the extreme ends of travel, but the trade-off is you will have less fine control near the neutral position. Since most of your flying will be done near neutral, you want the most control near that point. Otherwise, good article.

  12. “If you require more throw than your setup allows, use a longer servo arm to give you the throw you need. Avoid moving the pushrod closer to the surface on the control horn; moving it would reduce the leverage applied by the servo.”

    Doesn’t matter if you change the leverage on the servo or on the horn, you will always trade force for travel and vice-versa.

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