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But the variometer became key as pilots began making longer flights. The first portable variometer for use in hang gliders was the Colver Variometer, introduced in the 1970s by Colver Soaring Instruments, [11] which served to extend the sport into cross-country thermal flying.
The minimal instrumentation required is an airspeed indicator and a variometer. The pilot will use the polar curve information for the particular glider to derive the exact speeds to fly, minimum sink or maximum L/D, depending on the lift and sink conditions in which the glider is flying. A speed to fly ring (known as a 'MacCready Ring'), which ...
The two came together to produce a glider, designed by Lippisch and built at the RRG that had the performance to utilize thermal lift detected by the variometer. The result was the RRG Professor, first flown in May 1928 and intended by RRG to be built in numbers by clubs under licence, from their plans.
Much more than in other types of aviation, glider pilots depend on the variometer, which is a very sensitive vertical speed indicator, to measure the climb or sink rate of the plane. This enables the pilot to detect minute changes caused when the glider enters rising or sinking air masses.
The MacCready speed represents the optimal trade-off between cruising and circling. Most competition pilots use MacCready theory to optimize their average speeds, and have the calculations programmed in their flight computers, or use a "McCready ring", a rotatable bezel on the glider's variometer to indicate the best speed to fly.
The nose does not noticeably drop, but the variometer indicates a high rate of descent and the vibration continues until back pressure is released and stall recovery is initiated. Spin kit installation on the tail of C-FASK at the Bromont Airport in Quebec. The glider has little tendency to enter a spin.
The motor glider version is powered by a retractable 50 hp (37 kW) Rotax 503UL two-stroke engine and a 120cm wooden propeller. engine installation The engine is equipped with cylinder head temperature (CHT) sensors, and despite being installed in an upside down position, the temperature never causes concern during take-offs with maximum and ...
A hang glider ranges from 9.5 for recreational wings to about 16.5 for modern competition models. ... A variometer indicates climb rate (or sink-rate) with short ...