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Rate of climb speed and airspeed

Posted by Jeffrey Tan on March 6, 2010 at 11:30am
Hi there,
I have a question. Looking at Honeywell Micro UAV specification.
http://www.defensereview.com/stories/honeywell/Honeywell%20Micro%20Air%20Vehicle_Data%20Sheet.pdf

I don't understand why is the rate of climb speed slower than the airspeed. isn't it suppose to be the other way round?

Rate of climb: 25 ft/sec
Air speed: 50 Knots or 84 ft/sec

Thank you very much =)

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Replies

  • Ryan March 6, 2010 at 4:15pm
    Rate of Climb = straight up climb rate (max climb rate) = 25ft/s
    Air Speed = horizontal speed (without altitude deviation) = 50kts

    Two different things.
  • Ryan March 6, 2010 at 1:44pm
    In straight and level flight airspeed can be say 100 knots but the RoC will be 0 as it is straight and level whereas with a vtol ie any helicopter, harrier, osprey etc the forward airspeed can be 0 but the rate of climb could be 30ft/min or 10m/s. Thats the way I understand it. Correct me if I am wrong though.
  • Admin
    Morli March 6, 2010 at 12:52pm
    Not unless it is a rocket IMHO , ROC can be 0 but airspeed cannot , now can it be vis-versa?!
  • T3
    Krzysztof Bosak March 6, 2010 at 11:51am
    1. Gravity always wins.

    2.The landing must be careful.
    The flight is 'full forward', whatever that means.
    Additional limitations are the result of flight control algorithm.
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