Welcome to the NavList Message Boards.


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

Compose Your Message

Add Images & Files
    Re: Gyro sextant
    From: Tony Oz
    Date: 2019 Feb 7, 00:55 -0800

    Dear Bill, thanks for the answers.

    I asked about gyro's [in]sensitivity to sideways accelerations because it is interesting to see how the apparent coincidence of the gyro's mass center and its' point of support provide for the simultaneous static AND dynamic balance. In that case the gyro is indeed VERY insensitive to any (reasonable) disturbances. I played with that (the static and dynamic balance) when upgrading my turntable (a.k.a. "der Plattenspieler"). Because the tonearm is far from being symmetrical - with weights alone one cannot achieve both the static and the dynamic balance, making a statically-balanced pick-up sensitive to rumble and external vibrations. I had to use springs to statically-balance the tonearm that was first dynamically-balanced with weights. The spring is keeping the tonearm horizontal (and provides the proper stylus pressure) while the weight (actually - the mass) of the other end of tonearm is in the length·mass proportion with the pick-up side of the assembly. When subjected to an external shock/vibration the turntable moves as one piece, the pick-up is almost isolated from all the disturbances.

    It is MUCH easier to achieve all that for a spherically-shaped body as in this sextant.



    60°N 30°E

    Browse Files

    Drop Files


    What is NavList?

    Join NavList

    (please, no nicknames or handles)
    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 Settings

    Posting Code:

    Custom Index

    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