By Irwin E. Alber
Engineers have to gather “Back-of-the-Envelope” survival talents to acquire tough quantitative solutions to real-world difficulties, really while engaged on initiatives with huge, immense complexity and intensely constrained assets. within the case reviews taken care of during this booklet, we express step by step examples of the actual arguments and the ensuing calculations got utilizing the quick-fire approach. We additionally reveal the estimation advancements that may be received by utilizing extra precise physics-based Back-of-the-Envelope engineering versions. those various tools are used to acquire the ideas to a couple of layout and function estimation difficulties bobbing up from of the main advanced real-world engineering tasks: the distance commute and the Hubble area Telescope satellite tv for pc.
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5 Level-3 estimate: cargo mass delivered by a two stage vehicle; based on a revised estimate for second stage structural mass fraction During the second stage of the ascent, the single biggest structural component is the external tank that supplies the propellants to the Orbiter’s engines. It can be thought of simply as a very large thin-walled pressurized vessel. 1 Questioning the magnitude of the Level-2 structural mass fraction Our model calculations indicate that once the ﬁrst stage solid propellants have been consumed in the ﬁrst two minutes of ﬂight, the initial mass for the second stage of ﬂight is about 700,000 kg.
To illustrate the process, we developed Quick-Fire case study models for the 747 engine thrust problem, the Space Shuttle launch and cargo calculation problem, and the Hubble Space Telescope sizing problem. We discussed the tradeoﬀ between model complexity and estimation accuracy, and illustrated this issue by working the Shuttle cargo problem at four levels of complexity ranging from a purely empirical rule of thumb estimate to estimates based on two-stage models for the Shuttle launch to orbit derived from the classical Tsiolkovsky rocket equation.
Conﬁguration of the overall Hubble Space Telescope system [14, p. 14]. Sec. 5 Estimating the size of the optical system for the Hubble Space Telescope 29 System requirements for the HST Our primary estimation goals are to calculate the basic optical telescope scales and the optical performance necessary for this unique space telescope to meet the following major resolution and sensitivity system requirements: . High angular resolution—the ability to image ﬁne detail. High sensitivity—the ability to detect very faint objects.