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Excess speed on landings

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Old 05-30-2009 | 08:42 PM
  #26  
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From: rockville, IN
Default RE: Excess speed on landings



i have a sig lt 40 trainer, and i have found that my faster landings are due to an approach angle that is too steep.  sometimes this is inevitable, due to a dead stick or just mis-calculating.  what i do if i am coming in too fast is wiggle the rudder stick side to side, this helps dump a lot of that speed by increasing drag, the tail of the plane goes side to side.  just be sure not to over do it, and get it straight before touch down.  you can also hold a little right or left rudder, and give a little opposite aileron to almost crab in, this method is mainly used for crosswind landings, but it will reduce speed as well.  </p>
Old 05-31-2009 | 06:26 AM
  #27  
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From: Fort Worth, TX
Default RE: Excess speed on landings



Actually, if you're bounching the landings, you're getting too slow and stalling the wing. A common mistake for beginners is to treat the wing like a parachute that will float the plane down to the ground. You have to keep the plane flying all the way to the ground, and you need sufficient airspeed to do it. When your wheels touch down, you should still have enough airspeed to be able to pick the plane back up if you want to. What's probably happening is you're coming in and using your elevator to control altitude, which means you start your flare too soon. That kills your airspeed which then makes you pull up more, stalling the wing a foot or two off the ground. That'll bounce it every time. A nose heavy condition will make that tendency worse.</p>

There are two things to do to fix it. First, take a shallower approach angle. Second, keep the nose down until you're just a few inches over the runway. Keep your engine running and goose it if the controls get mushy. With adequate airspeed, any plane can be set down just like an egg using elevator control to make the fine adjustments.</p>
Old 05-31-2009 | 01:04 PM
  #28  
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Default RE: Excess speed on landings



How about "trim "the airplane for a slower speed, just like you would do with a real one.  Most adjust the elevator once for high speed and never touch it again.  When this is the case, and you pull your power, the airplane will still want to seek the speed it was last trimmed for - probably too fast for landing.  Proficient rc pilots can fly the landing pattern with some back pressure, but many new pilots can't.  Re-trim the elevator, or program a landing switch if you have that capability on your radio.   When speed changes, trim changes.  </p>

Kurt</p>
Old 06-02-2009 | 07:00 PM
  #29  
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Default RE: Excess speed on landings

Many modelers do not know how to properly configure there aircraft for landing. when setting up to land just dont cut the throttle to idle and float it in. That works with some sport aircraft but you will start to have issues as you move up to other aircraft. You probaly still have the mindset that power makes it go fast and elevator makes it go higher. Power controls altitude and elevator controls airspeed. Your aircraft is trimmed for flying around but not for landing. You need to configure the airplane to land. Back off on the throttle on the downwind leg let some airspeed bleed off and start to feed in elevator. When you get the aircraft slowed to where you want it add power to maintain altitude. Start your turn to final approach and use the throttle to control your decent. I like to cross the end of the runway about 4 feet off the ground. Once I get a couple of feet off the ground I power back and start my flare. I expect the aircraft to touch down about 1/4 the way down and roll out about half the length of the runway. Get up in the air and pratice slowing the airplane at altitude. Adjust the attiude and use the power to hold altitude. I like to do this with a trainer. On the ground I trim the elevator to about 8 degrees up elevator and leave it. then I manage power to fly and maintain altitude. Once comfortable with this you can fly using only power and rudder. also, read redfox435cam post on this thread he says the same.

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