Windtura 500 Low-Wind PMA with hyperspin blade?

Discussion in 'General Questions' started by fabieville, Nov 5, 2010.

  1. fabieville

    fabieville WindyNation Engineer

    I bought the 28" hyperspin blade(set of 5) to work with my windblue 540 low wind PMA that I have, but I am thinking of upgrading to the Windtura 500 Low-Wind PMA. The thing is that I want to know if I use my 28" hyperspin blade(set of 5) with the windtura 500 would it perform just as good as the stock 35" blade set that comes with the windtura 500 low wind-PMA starter kit? Because it would save me some money for not having to buy a next blade set to work with the windtura 500. And if the 28" works fine would I need to use 3 or 5 blades or probably a bigger hub too?
  2. windyguru

    windyguru WindyNation Expert

    It will work but not as good in low to medium wind speeds. Why not just keep the HyperSpins operating on your WindBlue and get the WindGrabbers for the Windtura? I understand it will cost more money this way but if you already have a WindBlue flying, it seems like a good idea to keep it flying. Then you can add a Windtura to your system without taking the WindBlue out of commission
  3. timber

    timber WindyNation Engineer

    If I'm not mistaken, the (3-blade) 35" Windgrabbers are a perfect match for the Windtura 500.
    A windswept area (approx. 35 sq ft) of the 35" windgrabbers is a very important factor in driving the Windtura 500.
    More important, IMHO, than the number of blades, even in low wind areas. I look at it like having a larger sq. ft. mainsail on a sailboat,
    it makes all the difference, especially with a light breeze. I have the Wintura 500 with 35" Windgrabbers which I'm working on installing now.

    I would imagine that the (5-blade) 28" Hyperspin blades are a great match for the Windblue since it requires a higher rpm that a smaller diameter blade set will provide. Longer blades turn at a slower rpm but provide more torque due to the larger windswept area.

    I have an induction motor conversion, alternator that I am going to rebuild so that I can eventually run two "gennies". It is a home-built unit that requires higher rpm to get a reasonable output or wattage (Watts = Volts x Amps). The higher RPMs (smaller diameter) keep the voltage up and the windswept area (torque, provides the amps), which together give you the wattage. I'll be using a 5-blade set of fiberglass blades about the same diameter of the Hyperspin blades in order to get the voltage I need from the lower wind speeds here.

    It's a balancing act that we all have to play to get the most out of the winds that we have at our locations. In order to get more charging power, we have to match the blades to the turbine. I'd definitely go with the longer blades with the Windtura 500 to get more out of it. The Windblue with higher RPM blades will supplement your charging system nicely.

  4. It seems that windy nations is moving toward five blade blades. Do they work better or do three blade. I'm in a low wind area 14, 15 is the top speed most days. I have a windura 500 PMA w/three windgrabber blades. 12 volt. What is the differance between the three and the five. The diameter is the same so the speed should be the same. Dopes anyone know what works best, seems like a lot of guessing. I need help. Dan Kramer
  5. windyguru

    windyguru WindyNation Expert

    For STRICTLY low wind conditions on a 12 volt battery bank, the five blade WindGrabbers will give slightly better power production. As the wind speed increases, the 3 blade WindGrabbers will outperform the 5 blade WindGrabbers. Five blades will probably be a better choice for you if you rarely see winds above 15 mph.
  6. leamywind1

    leamywind1 WindyNation Engineer

    Please see my vids, so far i have seen 300- 400 watts out of the 750 PMA (grid tied 10-30v 500w) using the 5 large WN blades in about 20 MPH winds. My WN turbine is up 25ft and i am not concerned with ever seeing 750 watts at that height so for me the 5 blades work. I am sure i will see more but those winds of 30+ are 15 times a year and are gust's. Know your site, your pma and be very realistic of what wind speeds you really have, that will dictate your blades of choice.
    Hope this helps
  7. leamywind1

    leamywind1 WindyNation Engineer

    Currently i am trying out the 3 large WN blades with the heavy hub on a HY 400 just to compare th stock HY one's. So far pretty good results. They start up just as easy however i am not sure i can get the rated RPM needed for top end production since they are a larger blade then the 5 stock ones. It's a trade off low wind watts/ run time with the larger blades or more top end power with smaller ones. HMM

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