Register

If this is your first visit, please click the Sign Up now button to begin the process of creating your account so you can begin posting on our forums! The Sign Up process will only take up about a minute of two of your time.

Results 1 to 2 of 2

Thread: Flight times


  1. #1

    Join Date
    Jun 2005
    Location
    Las Vegas , NV
    Posts
    70
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    Flight times

    If you know the amp draw and the battery size what is the formula to get the expected flight times?

  2. #2
    jdetray's Avatar
    Join Date
    Dec 2004
    Location
    Napoleon, OH
    Posts
    1,617
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: Flight times

    ORIGINAL: andrewskj

    If you know the amp draw and the battery size what is the formula to get the expected flight times?
    Formula for Run Time

    run time in minutes = (Battery Capacity in Ah/Motor Current in A) x 60

    This is just a rough guide, and it requires that you know approximately how much current your power system draws. A wattmeter will tell you. The formula also needs your battery capacity in Amp Hours (Ah). Divide mAh by 1000 to get Ah.

    The simplest method is to measure your current at full throttle and use that number in the formula. In reality, you probably won't fly at full throttle all the time, so your average current usage probably will be less than the full-throttle value. Also, a power system will often draw less current in flight than it does during ground testing.

    So if you use the full-throttle current in the formula, it will generally give you a worst case flight time. Actual flight time will usually be greater.

    I've included some examples below.

    - Jeff


    Here are some examples.

    Example 1:
    1500 mAh battery
    power system draws 12A

    1500 mAh = 1.5 Ah

    1.5/12 x 60 = 7.5 minutes


    Example 2:
    1500 mAh battery
    power system draws 18A

    1500 mAh = 1.5 Ah

    1.5/18 x 60 = 5 minutes


    Example 3:
    4000 mAh battery
    power system draws 25A

    4000 mAh = 4.0 Ah

    4.0/25 x 60 = 9.6 minutes


    Example 4:
    5000 mAh battery
    power system draws 25A

    5000 mAh = 5.0 Ah

    5.0/25 x 60 = 12 minutes
    My other hobby: www.AstronomyBoy.com


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
All times are GMT -6. The time now is 01:40 AM.

SEO by vBSEO 3.6.1 ©2011, Crawlability, Inc.