Shuttle Speed and ATM Factors

Discussion in 'Shuttlecock' started by silentheart, Dec 26, 2006.

  1. silentheart

    silentheart Regular Member

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    I just open this thread to continue the discussion from the other post.

    Anyone care to share their opinion?
     
  2. Matt

    Matt Regular Member

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    Lets have a table with the speed equivalency with the following column.

    Yonex, International, metric and grain.
     
  3. Pete LSD

    Pete LSD Regular Member

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    Matt, please do a search. It was widely discussed before.

     
  4. cooler

    cooler Regular Member

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    cut and pasted from sosan website (provided by twobeer)

    Shuttle Speed
    The shuttles were traditionally divided into 48, 49, 50, 51, 52 according to the weight of the shuttles. 49 weights 4.9g, 50 means 5.0g, 51 means 5.1g and so on. We found the shuttles using these rating was inaccurate and therefore was difficult to classify. So we change the shuttles' speed standard. We use Speed 75, 76, 77, 78, 79, 80 instead. There is a 30cm distance between each speed. Shuttle speeds are ideal for different parts of the world. For example, shuttles with Speed 76 are used in China during the summer and 77 during the winter months. We send the shuttles with Speed 75 to Thailand, Speed 76 ,77 to Singapore, Hong Kong and Malaysia, Speed 77, 78 to U.S.A., Speed 78,79 to Finland, Canada, Korea and Japan. Speed 79, 80 to Australia in winter. Speed 73-74 would only be played in high altitude area as Yunnan Province in China and Colorado Springs in U.S.A. ; high temperature area as Johannesburg in South Africa.
    ------------------

    vining had brought over some blue shuttles for his annual tourney. It was meant for colorado spring. It is prolly speed 72-73 because this is the first time i saw shuttle that was too SLOW for calgary.
     
    #4 cooler, Dec 26, 2006
    Last edited: Dec 26, 2006
  5. silentheart

    silentheart Regular Member

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    The reason for such slow speed is because the thin air at very high alt. Humidity also plays big role (not eggroll) in determin the speed of shuttle. Higher the humidity, lower the shuttle speed.
     
  6. BaddGolfer

    BaddGolfer Regular Member

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    We can probably summarize this by listing the 3 main things that affect what shuttles we need to use...

    1. Temperature --- The higher the temperature of your location/gym, the farther the shuttle will fly, so you will need a slower shuttle.

    2. Altitude -- The higher the elevation of your city, the farther the shuttle will fly and you will need a slower shuttle to play.

    3. Humidity -- The higher the humidity, the farther the shuttle will fly and you will need a slower shuttle.

    Relatively speaking, the humidity in general probably has less effect on what speed shuttle you need to play at your location than the temperature and the altitude...
     
  7. DinkAlot

    DinkAlot dcbadminton
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    I'd like to add to this...in bold and red below...(any physicists, please correct me if I'm wrong, thanks):

     
  8. BaddGolfer

    BaddGolfer Regular Member

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    " 3. Humidity -- The higher the humidity, the farther the shuttle will fly and you will need a slower shuttle. DinkALot: This is because the higher the humidity the heavier the shuttle becomes."

    I don't think the shuttle will become heavier, the shuttle will go farther because humid air is less dense than dry air. Actually, in all 3 cases, the shuttle flies farther for the same reason, the air gets less dense as each of the 3 items (temp, alt, hum..) increase...
     
  9. Matt

    Matt Regular Member

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    I did Pete but it does not contain the information I am exactly looking for. Looking at the replies when I was out, that is more what I am looking for.
     
    #9 Matt, Dec 26, 2006
    Last edited: Dec 26, 2006
  10. Matt

    Matt Regular Member

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    I still don't quite understand #1 unless it needs to be factored in with #2 and #3 to get the picture. Maybe you can explain it BaddGolfer.

    As I've seen in my own gym, a speed 77 too fast and a 76 even faster in our climate where we typically use here a 78. I have seen the 78 fly slow when the gym is very warm (heater on earlier), where either the 77 or 76 would fly at the correct speed until they start going too fast as the temperature drops down to where the 78 can be used again.

    Thanks
     
  11. DinkAlot

    DinkAlot dcbadminton
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    There's some confusion here, at least for us in the U.S. For us 76 = slowest, 77 = medium speed, 78 = fastest. In your post above 76 is faster than 77. So your speed ratings are backwards compared to ours.

    Don't understand your next few sentences, please clarify.
     
  12. Pete LSD

    Pete LSD Regular Member

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    Maybe Matt's 77 has the wrong speed rating. It happens.

     
  13. DinkAlot

    DinkAlot dcbadminton
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    Yes Sir, it does happen. OAN (On Another Note): Gosen Pro 66 appears to be very nice. :D Will give you more feedback after tonight...
     
  14. Matt

    Matt Regular Member

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    I know they should be the other way, but it's the exact opposite from what I have observed. I'll rephrase it.

    Since the 77 and 76 are lighter, these are able to cut through air more freely which is why they fly too fast for our climate. Speed 78 for us is fine because the added weight creates more drag so it does not cut through the air as freely. A few local stores have also mentioned simlar as well.

    The part about the gym, under the facilities proper temperture, the 78 travels at the correct speed. When the gym is very warm because the facility raised up the temperature for some reason (heater is already off as they did it earlier), the 78 travels too slow as warm air is more dense than cold air. The 77 would be used for the time being because it can cut through the dense air, therefore it would be faster and travel at the correct speed; until the tempeature drops back to normal that the 78 can be used again as the 77 is gaining speed.

    Pete, maybe it's the people shuttles supposed rating is incorrect. I never personally obtained a 77, 76 myself. However when I notice a shuttle flying too fast when using them, I simply ask to look at their shuttle packaging. Interestingly it saids 77 and when I asked where they got it from, they said China. I wasn't suprized because the packaging also has Chinese writing on it as well.
     
    #14 Matt, Dec 26, 2006
    Last edited: Dec 26, 2006
  15. Matt

    Matt Regular Member

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    Let me know, I am interested in your response.

    Thanks
     
  16. Pete LSD

    Pete LSD Regular Member

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    I don't understand why your batch of 77 grains shuttle fly faster than 78 grains ones, given the same temperature, humudity and air pressure. The most likely explanation is that the batch of 77 grains shuttles are mis-classified at the factory.

    The lighter weight shuttles always fly slower than the heavier ones: it's the law of physics. The lighter shuttles loose their momentum due to drag a lot faster than the heavier ones. The amount of drag of an object is not dependent on its weight but from its shape.

     
    #16 Pete LSD, Dec 26, 2006
    Last edited: Dec 26, 2006
  17. Matt

    Matt Regular Member

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    Well Pete, they are not mine, it's theirs. That's why I don't really get it. I'll see if I can find like a Yonex shuttle in speed 3 as a test. The ones I've mostly seen was the Victor, Best Buy plaza and some generic ones, and they were mainly like 77 or 76.

    Unless all of those shuttles have QC isssues, that would probably make some sense.

    Most of the time if you just do a test clear, it's like whoa!!! too fast (tip feathers).
     
    #17 Matt, Dec 26, 2006
    Last edited: Dec 26, 2006
  18. Matt

    Matt Regular Member

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    When looking at wiki, this actually has key information I am looking for supports #1 which I can understand.
     
  19. DinkAlot

    DinkAlot dcbadminton
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    Well, just as PeteLSD told me, the Pro66 is not very durable. I broke the string in just 10 minutes of play and all I did was dink. It broke on a very, very light cut/slice drop shot. I was very surprised it broke because the shot was so light.

    Anyway, no more Pro66 for me. It didn't play any better than BG80 or MP and I don't think it could be better so I'm not going to bother with a string that lacks durability.

    Next up, the 0.70mm version of the string... BS322 (I believe).
     
  20. Matt

    Matt Regular Member

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    Probably have better sucess with this one. Personally when I tried it, it seem a bit of a dead feeling compared to the Pro 66. Maybe because of the thickness? I changed back to the 66 after a while.

    Just curious, how high did you exactly put the BS323 anyways?
     

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