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Another less commonly used method of increasing trim speed is to increase tension on the crossbar by pulling it back further, slightly increasing the nose angle and reducing twist. This increases the angle of attack (AOA) of the tips producing more lift, and it lowers the nose to a higher trim speed. This is a typical in-flight trim adjustment for high performance hang gliders. The roll control is diminished with this faster and stiffer wing. 

Ground adjustable trim systems are described in the Pilot's Operating Handbook (POH) for each aircraft. Different loads may require different pitch settings. 

##  Inflight Adjustable Trim Systems 

Being able to adjust the trim systems in flight has a number of advantages as discussed later in the flight sections. A number of inflight adjustable systems are available with different manufacturers. A common in-flight adjustable trim system is raising and lowering the trailing edge. Raising the trailing edge increases airfoil reflex and slows the wing. Lowering the trailing edge decreases airfoil reflex and speeds up the wing. Typically, a crank on a downtube controls a wire that runs up the downtube to the top of the wing. As a result of moving the crank, the trailing edge wires are raised and lowered and the trim speed changed. [Figure 3-22] Hydraulic 

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or electrical systems can move the hang point on the wing for other inflight trim systems. [Figure 3-23] 

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Another pilot-actuated trim system in flight is an elastic system in which the pilot increases tension on the elastic system which raises the nose for climb and slower fl ight. [Figure 3-24] 

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##  Carriage 

The carriage is a completely separate structure from the wing. Without the wing, the carriage can be driven around if needed. Most of the weight and cost of the WSC aircraft is in the carriage. There is a wide range of carriage designs from the most simple and basic open trikes to the more sophisticated and complex trikes that integrate cowlings and offer a number of adjustments for the pilot and passenger, resulting in comfort and less fatigue during fl ying. Generally, 

