An improved airborne wind measurement technique for the NAE twin otter

Airborne wind measurement techniques currently being used onboard the NAE Twin Otter Atmospheric Research Aircraft are described and their fundamentallimitations are discussed. In particular, a recently acquired L TN-90-1 00 strapdown inertial reference system (IRS) demonstrates significant low frequency Schuier oscillations in its velocity...

Wind tunnel calibration of a PMS canister instrumented for airflow measurement

Measurements of cloud particle images and concentrations using laser spectrometers housed in pods mounted on the wings or fuselages of research aircraft can be affected by the distortion of the airflow about the aircraft. The Flight Research Laboratory has developed a pod with a Rosemount 858 5-hole probe and pressure transducers to measure...

Theoretical and measured airflow about the twin otter wing

The NAE Twin Otter atmospheric research aircraft carries instruments mounted under the wings to count and image cloud and precipitation particles for cloud physics studies. As part of an investigation on the influence of the aircraft presence on these measurements, airflow velocities about the wing have been calculated. These theoretical results...

Results of intercomparison flights between the NAE T-33 and the NCAR Buffalo atmosperic research aircraft

Recent international atmospheric research programs such as BOMEX and IFYG L have been of such a large scale that several aircraft are required to collect data, which, when combined with radiosonde and surface measurements, ultimately form a large internationally- accessible data bank. A fundamental part of the program, and one which rarely...

Measurements of the statistical properties of atmospheric turbulence at altitudes below 1000 feet

Measured statistical properties of the three components of turbulence are presented for research flights at four altitudes below 1000 feet over flat terrain and two altitudes below 1000 feet over hilly terrain. The measured power spectral density distributions were closely approximated by the von Karman spectral shape. The derived scales of the...

A suggested method for estimating patch length from turbulence measurements using results from low altitude flights by a T-33 aircraft

When an aircraft encounters a patch of turbulence, the RMS turbulence intensity is usually constant only over a portion of the total period of exposure. A method is suggested for estimating the patch length as a function of intensity for turbulence encounters that have two or more regions of different turbulence intensities. It makes use of the...

Stratospheric turbulence and temperature gradinets measred by an RB-57F; coldscan flights 57-92

Through most of the period from January 1969 to June 1971, a USAF RB-57F high altitude weather reconnaissance aircraft has carried special NRC instrumentation to measure and record stratospheric turbulence and horizontal temperature gradients encountered on routine flights at altitudes from 40,000 to 65,000 feet. The main purpose of this...

Stratospheric turbulence and temperature gradients measured by an RB-57F; Coldscan flights 19 to 56

Since January 1969, a USAF RB-57F high altitude weather reconnaissance aircraft has carried a special NRC instrumentation system to measure and record stratospheric turbulence and horizontal temperature gradients encountered at altitudes from 40,000 to above 60,000 feet. The chief purpose of this co-operative program, named "Coldscan", is to...

Stratospheric turbulence and temperature gradients measured by an RB-57F: Goldscan flights 2 to 18

In January 1969, the National Aeronautical Establishment instrumented a USAF RB-57F weather reconnaissance aircraft to measure turbulence and temperature gradients encountered on routine flights at altitudes from 40,000 feet to above 60,000 feet. To date 19 data flights covering 30,000 nautical miles of the central and western United States have...

Instrumentation of an RB-57F to measure high-altitude turbulence encounters

The National Aeronautical Establishment has installed a turbulence instrumentation package and memory recorder on a USAF RB-57F weather reconnaissance aircraft at Kirtland Air Force Base, New Mexico. The object of the project, named "Coldscan", is to record turbulence encounters and temperature changes on routine weather patrol and training...

An improved theoretical model for the ground distribution of water released from a fire-bomber

Equations based on aircraft speed and altitude, tank geometry, and certain parameters of the erosion process are given for the discharge from the tanks, the erosion into droplets and tbe resulting distribution on the ground of water released from a fire -bomber. A development of a previous theoretical model that displayed some weaknesses, the...

Ground distribution contour measurements for five fire-bombers currently used in Canada

This Report presents the results of the firebomber ground distribution tests made at Uplands Airport during the spring, summer, and Call of 1967. A total of 37 contour patterns are presented for five of the major existing fire-bombers currently used in Canada; the Turbo-Beaver. the Otter. the Twin Otter. the TBM Avenger. and the Canso. Pertinent...

A theoretical model for the prediction of the distribution of water released from a water bomber

A theoretical model is developed ta describe the discharge of bulk waler from the tanks of a water bomber and its subsequent erosion into droplets . Equations are presented to enable the prediction of droplet cloud shapes and longitudinal ground distributions based on aircraft speed , tank geometry, and certain parameters of the erosion process....