![]() The Cessna 172 was arguably the most elegant compromise in the history of aviation. It was an affordable, economical, utilitarian, safe and easy-flying airplane that could fill a variety of roles. It achieved its popularity through an unbeatable formula. It wasn’t that Cessna was resting on its laurels, though it could be excused if it were - even back in the 1960s, the 172 was the undisputed king of light aircraft. For many years, it wasn’t far from the truth. Thirty-five years ago the running joke about the Cessna 172 was that pilot reports on the latest model could be cribbed from the previous year’s article with updated references to the new paint scheme and fabric options. ![]() While the powerplant options continue to evolve, with the JT-A burning Jet-A, and an electric-powered version in the works, the Skyhawk flies on floating the same planform across the sky as it did in the 1950s. Input in Excel: data can be changed for different scenarios Ĭontact details Paul van Hooff Koen Idzenga +31 6 4403 0083 +31 6 5361 9950 Significant B.V.More than 72 years have passed since the Cessna 172 first appeared on engineering drawing boards in Kansas, and the airplane still figures into the training plan for many pilots who learn to fly around the world.Software for building System Dynamics Models. ![]() Which risks can a PTA manage and which not? įor different buses in the fleet: costs Total costs Maintenance Depreciation Fuel costsĭifferent environmental outcomes NOx PM10 CO2.Which data are correct and which are not? → sanity check.Interests of operators and vehicle industry.Interests of departments (mobility, environment, economics, finance).charging & filling stations Emission per fuel type (Well to Wheel) such as CO2, NOx and PM10 Shadow prices for each emission type (health, plants and buildings) Reliability Characteristics techniques Characteristics concession Time-table Route length Number of routes Route characteristics (city / region) Physical quantities Characteristics bus fleet Number of buses in city and region Prices of buses Maintenance costs Additional infrastructure e.g.The Green Cockpit – an overview Feedback & optimization Characteristics techniques Characteristics concession Calculation Module (System Dynamics) Characteristics bus fleet Physical quantities Process & stakeholder management and creating support Some modelling conventions “If a future value of a variable is uncertain, you can decide not to model it, but then you’re sure that the results aren’t correct” “Leaving out a variable that is difficult to estimate, is like giving it the only value that it doesn’t have: zero”. Is the beginning of the discussion about sustainability in public transport (support of your decision). Helps PTAs to optimize their greening transition in time Can deal with ranges in values in case of uncertainties (sensitivity analysis, what if.) Enables PTA’s to compare different scenarios of different bus types Shows the development in (environmental) costs for each year in each scenario (Total Cost of Ownership - TCO) Buses, fuel consumption, infrastructure etc.Helps PTAs to get a better understanding of the costs involved requirements for the buses in Arnhem Nijmegen City Region?īiogas Many questions, opinions and uncertainties Electrical Technical Context Reliability Suitability Emission Costs Availability Future technical develop-ments Diesel Political wishes Budget Hydrogen Future number of passengers Commercial interests of operators Price development Tank to wheel/ well to wheel Functional or technical specifications Tender strategy.How can we translate (political) goals to realistic.Step by step development with focus on regional issues.Calculates ‘best ratio’ between environmental quality and costs for Public Transport Authority (PTA).To support the tender of the Public Transport concession (10 years contract 2012 - 2022).Originally developed for the Arnhem Nijmegen City Region.Fanatic field hockey player (but low level…).Currently about 50 researchers and consultants.Formerly part of Pricewaterhouse Coopers – in 2003 management buy out.Paul van Hooff Koen Idzenga EMTA 19 april 2013 The Green Cockpit Decision support for realising sustainable public transport Significant B.V.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |