Welcome to the NavList Message Boards.

NavList:

A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Message:αβγ
Message:abc
Add Images & Files
    or...
       
    Reply
    Re: Christmas week Quizzes
    From: David Pike
    Date: 2020 Dec 27, 04:12 -0800

    Quiz No2

    Our pilot from yesterday decided he enjoyed his flight so much he’s decided to do the same again today. His airspeed speed will still be 150 kts; he’ll still have three hours safe endurance; and his outbound track will still be to the east.  However, today, the forecast wind velocity is 30kts from 030 degrees.  Calculate what his heading should be if he is to track to the east; after how many minutes he must turn around to track back west, how far east he will have travelled; and what his heading home must be.

    Solution to yesterday’s Quiz

    Let distance east = R. Groundspeed out =Go = 150-30=120kts. 

    Groundspeed home = Gh=150+30=180kts.  Time out = To = R/120.  Time home = Th = R/180

    Endurance = E = 3hrs = To + Th = R/120+R/180 = R (120 + 180)/120x180 = 300R/21600

    Therefore R=3x21600/300 = 216nm and To = 60x216/120 = 108minutes

    Check: Does Th = 180-108=72minutes = 216x60/180 yes it does. DaveP
       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Join NavList

    Name:
    (please, no nicknames or handles)
    Email:
    Do you want to receive all group messages by email?
    Yes No

    You can also join by posting. Your first on-topic post automatically makes you a member.

    Posting Code

    Enter the email address associated with your NavList messages. Your posting code will be emailed to you immediately.
    Email:

    Email Settings

    Posting Code:

    Custom Index

    Subject:
    Author:
    Start date: (yyyymm dd)
    End date: (yyyymm dd)

    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site