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Throttle Control Cables

in General Tech Discussion 9 years ago

  • Re: Throttle Control Cables

    by » 9 years ago

    Hi Ken,

    One on each side.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

      
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  • Re: Throttle Control Cables

    by » 9 years ago

    Hi, speaking of idle throttle stops. I have set mine up just as in the picture. I have my 912ULS idle set to 2000rpm when static. Trouble is when I'm landing there must be a windmill affect to some extent and when the throttle is back on the idle stops on approach , I'm getting about 2500-2800rpm which is a bit high and tends to float. Is there a remedy for this?
      
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  • Re: Throttle Control Cables

    by » 9 years ago

    Hi Neil,

    Set the low throttle rpm down around 1700 and you'll be fine. This will help during taxi in not riding the brakes as much and make shutdown of the engine easier. It should also help in starting. Sometimes a high idle can work against you. The rpm though should not be an issue. The aircraft speed is controlled with the stick and not the throttle. Whether you're at 1700 rpm or 2700 rpm the stick still controls the speed. With the higher rpm you'll just need more aft stick compared to 1700 and your touch speed should be the same. You use this very technique in slow flight demonstration. Pull the stick far enough back at most rpms and the speed will fall until it completely stalls.You are basically doing the same thing at landing.

    The windmill effect is real and should not be an issue. We all have it..

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

    Thank you said by: Neil Cooper
      
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  • Re: Throttle Control Cables

    by » 9 years ago

    I agree with Roger completely, however there is one effect he didn't mention. The higher rpm will flatten out your glide slope even though you have pulled back enough to maintain the same approach speed. This gives the effect of more float. Stick controls speed, throttle controls altitude (glide slope). For this reason I have my idle set at 1650 rpm.
      
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  • Re: Throttle Control Cables

    by » 9 years ago

    I actually leave some throttle in right to touch. It does flatten out the sink rate as you round out to the runway and it gives absolute control over the rudder and stabilator (or elevator) during landings verses speeds so slow they have much less affect. I do this (leave a tad throttle in) with full flaps too. If I want a real short field landing then yes I use full flaps and idle throttle. Personally I don't care if I glide another 75' for my every day landings because all my landings are then very smooth and there is less chance for a damage or a drop. This also helps if you were to balloon and need instant throttle. The engine is already spooled up (just like a jet) so if you slap the throttle wide open you are saved.
    It's absolutely great in high wind landings. I can get down in 25-35 winds without any issues with a little rpm to the ground and leaving flaps at Zero. (I have -6, zero, 15, 30 and 40 flaps) More or less you are flying the plane right to touch. Makes life easy.

    Many in our LSA community and owners I know around the country use this technique.

    It's just one more mental tool in your toolbox when things are not a normal landing. I don't believe one landing set up fits all. I practice a bunch of different landing configurations with a tad power to the ground, idle, full dead stick and in all these in different flap configurations. When things go bad landings are anything, but normal or where you usually do them.


    Flexibility, calmness and practiced emergency scenarios gets you out of tight spots versus narrow mindedness as some CFI's teach. Some are taught one way so that's all they teach.


    Because of prop windmilling on approach a 1650 rpm should not yield any longer landings when they are done properly.

    I was challenged by some owners in the UK that they could not land a Flight Design CT in their 300m grass strip unless the idle was set down to 1500 rpm. I took the challenge and myself and a friend measured off 300m (about 1000 ft). I then did 10 landings at 2700 rpm and all landings were easily within the 300m. I guess my point is don't always be to quick to blame the plane.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

      
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