Runaway Trim by Sean Ferguson
I had my first experience with an out of trim airplane in 1968, just a few days before my first solo. On a nice spring day I took off in a Piper Super Cub (PA18-150) to practice takeoffs and landings.
A small auxiliary surface hinged on an airplane's control surfaces, used to bring it into balance or trim. This may be as simple as a small metal tab on the trailing edge of an elevator that is set to trim the aircraft for horizontal flight.
Twin Engines ...
An airplane in a specific configuration will perform consistently according to its power and attitude. Learn to set power and trim for attitude and you will get consistent performance. Adjust trim only when making a, power or airspeed change.
Trim: Adjusting control of aircraft in climb, level flight and descent, so pilot is not required to maintain continuous pressure on elevators, ailerons or rudder.
T-VASIS: T Visual Approach Slope Indicator System.
The trim control is usually on the stick, operated by the thumb. Trimming adjusts the position of the flight surfaces to hold straight and level flight, without changing the neutral position of the stick.
A secondary control surface, usually mounted to primary control surface such as aileron, elevator, rudder, or stabilizer, that controls the position of the primary control surface, and is controlled by the an operator or an autopilot; Symbols: delta sub T; Typical Units: rad, deg; ...
A trim tab is a small, adjustable hinged surface on the trailing edge of the aileron, rudder, or elevator control surfaces. Trim tabs are labor saving devices that enable the pilot to release manual pressure on the primary controls.
Trim controls, which usually take the form of knobs or wheels and are used to adjust pitch, roll, or yaw trim.
A tiller, a small wheel or lever used to steer the aircraft on the ground (in conjunction with or instead of the rudder pedals).
Trim Tab - 1. A device that can fly an airplane better than the pilot. 2. Popular diet beverage for fat pilots (also see "Gross Weight"). 3. A soft drink popular among female pilots who like to wear skin-tight red jumpsuits.
To trim your windows to size, follow the instructions in the plans. After they are to size, peel some of the Spray Lat from the edges all the way around, approximately 2". Apply two layers of duck tape over the Spray Lat surface with the duck tape to within about 1" of the edges.
Pitch trim is controlled by an anti-servo tab affixed to the trailing edge of the stabilator. Pivot the stabilator by hand and watch the trim tab: It moves in the same direction as the trailing edge of the stabilator, only more so.
Check the trim tab and rudder hinges for any flutter (less is better), take a good look at rudder stops and rudder cables. Verify that fairings are attached properly with all screws in place, sometimes, they have left the airplane without telling the PIC.
In standard trim, adequate for basic VFR, a Super Decathlon is priced at $146,900. This makes the top American Champion a reasonable trainer, especially in contrast to the two other dedicated trainers: the Liberty XL2 and the Diamond DA20 Eclipse.
I use a reference trim of 121 microadjustable notches (16 quick presses of up elevator starting from full down elevator--abbreviated 16qu). Slowflight (60-65 knots, gear down) is achieved by trimming up 4 X 2qu (four sets of two quick presses of up elevator).
If the "Design" or "Trim" mode is chosen, the following variables are displayed. The Weight of the kite is calculated based on the input geometry and the materials selected. The weight is displayed in ounces or gram-weights and does not include the weight of the control line.
Failure to trim with anti-torque pedals
Pilots will either forget to push right pedal, or push too much, or even sometimes push the left pedal! In any case, the aircraft should be autorotated in trim, and the pilot can do this by putting in the correct amount of right pedal when the engine fails.
Nose-up trim will therefore be required.
You will need to cross-check the airspeed indicator (ASI) because you want to climb at a specific airspeed and because the ASI will provide an indirect indication of the pitch attitude.
If the airspeed is higher than desired, you need to raise the nose.
In an autorotation, some degree of right pedal is required to maintain correct trim. When torque is not present, mast thrust bearing friction tends to turn the fuselage in the same direction as main rotor rotation.
The airplane landed safely at about 1228 Eastern time following an in-flight pitch trim malfunction. The airline transport-rated pilot and copilot were not injured and the airplane was not damaged. Visual conditions prevailed.
Early models were a red color with silver trim until the new "Cub Yellow" was assigned. It is an interesting side note that C. G. Taylor was not impressed with Jamouneau's work and fired him. Later, William T. Piper rehired him and the rest, as they say, is history.
There is another condition affecting flight, which is the aircraft's state of trim
or equilibrium (where the net sum of all forces equals zero).
Some aircraft can be trimmed by the pilot to fly 'hands off' for straight and
level flight, for climb or for descent.
include the ruddervator (combined elevator and rudder as on the "V" tailed Beech Model 35), Elevons combining elevator and ailerons and Flailavators which control pitch & roll as well as flaps in wing trailing edge control surfaces. Other subsidiary controls are pitch, roll, and rudder trim tabs ...
A horizontal stabilizer that can be pitched to trim the elevator. This surface movement can minimize the local angle of attack, so this form of tail surface is considered to be less susceptible to tail stall than a standard horizontal stabilizer.
True Airspeed ...
workshop back in Chicago had completed a multi-wing glider, the Katydid, so named because of its insect-like appearance, and brought it to the test site. The craft had six pairs of wings, arranged on a central frame and pivoted so that the wings could adjust and bring the aircraft back into trim no ...