Space propulsion devices such as electric and chemical propulsion, yield a wide-range thrust from nN to kN and have weights from grams to ten of kg. Hence, some thrusters have a thrust-to-weight ratio below 1. Especially for low thrust-to-weight ratios, the thrust was measured with thrust...
At high altitude the nozzle skirt is extended, raising the expansion ratio of the nozzle substantially to improve performance. Although performance enhancements are obtained with such an approach, it is rarely employed because of the added weight and complexity associated with such a system; see, ...
Perhaps more conventional – if only slightly- were Harry Ricardo’s plans for diesel two-strokes. Andrew Nahum’sexcellent paper‘Two-Stroke or Turbine’ examines these engines in detail, but these were to be ‘sprint’ engines of very high power/weight ratio, with the added advantage of run...
For some selections of properties and parameters more than one solution is possible and the meaning of these solutions is discussed by means of asymptotic expansions. Our results further show that while under stationary conditions the thrust-augmentation ratio assumes a value of 2 in the large area...
This process has been demonstrated to give gains in performance, for example, to increase the thrust to weight ratio of a 650 klbf-thrust class engine by more than about 60%. A primary issue associated with bi-propellant TAN systems is that two injection flow paths are required, and these ...
expected. One tool that Microsoft affords us, is the Fuel and Payload button on the aircraft selection page. This is a quick glance section to see if Fuel and Payload is within the Weight & Balance envelope for that aircraft. Is it accurate enough to ascertain whether or not a plane will...
Running my completed and ready to fly Eurofighter across my hangar scales revealed an all-up-weight of 5 pounds 4 ounces, or 84 ounces. Specified weight is 79 to 85 ounces, placing mine just within this range. That this is a fairly large plane becomes evident when you are carry...
Weight ratio PDMS/corundum 1/1 Mixture density (ρ) Ca. 1600 kg/m3 Viscosity (η)* Ca. 1.5·105 Pa·s Rheology (with sensitivity to strain) Near-Newtonian (n = 1.05 to 1.10) * Valid for model strain rates <10−4 s−1. Table 2. Parameters used for model scaling. Densitie...
The average of multiple measurements with the calibration weight was found to be 1.002 kg, with an error of less than 0.5%. This suggests that the sensor’s measurement accuracy meets the experimental requirements. In addition to the tension sensor error, there is also an error associated with...
However, it is noticeable that there was no metallic surface spalling due to the solid contact. It can be clearly seen that a tribochemical reaction took place in the area of the highest slide to roll ratio. As a reminder, this area is at the two ends of a roller element in ...