john p wrote: »
The blades on mine take the dia from 4ft to 5ft and no matter what im told or what is written I just dont believe the 5ft blades go slower than the 4ft blades.
russ wrote: »
Isn't 3 X nothing more or less equal to 5 X nothing? Plus expenses naturally.
Cariboocoot wrote: »
You're missing the tricky bit; converting the available wind power into turbine power. Since the 5 blade version can pick up the lower speed winds better and actually produce power when a 3 blade set-up will just sit there the over-all power is increased. In other words you are correct if both blade sets would spin the turbine at the same RPM for a given wind speed, but they don't. It's that losses bugabear again!
Ever heard a two blade turbine? "Whomp ... whomp ... whomp ..." Very noisy! The 3 blade version "turn into the wind" (change direction) better too. Not sure if 5 would improve that any.
Not sure if a 5 blade version would show any improvement over a 3 blade if the swept area was equal either. Probably would start better, due to the torque ratio differences (more wind acting on the same equivalent leverage). Kind of difficult to compare, given the numerous variables.
john p wrote: »
I just dont understand some of the posts here about turbine speeds between 3 blade and 6 blade. If the turbine went slower with 6 blades than 3 it would put out LESS watts it cant be any other way. Output goes UP with RPM,,
I have an AIRX it put out nothing in very low wind and reached about 30a in very strong winds Changed the blades to 6 and 5ft dia instead of the 4ft dia and found it was much less noise, it started to produce some power in winds that the 3 blades would still be stationary, top output went to 40a. there was so much power the tail that is part of it is then way to small to control it and it went out of control changing direction too fast it bent the 1/8 thick blade mounting plate. added much bigger tail and now all is good..
I dont know why they dont make the AIR X like this to start with . then it would be a great wind genny straight out of the box
keyturbocars wrote: »
Do you guys agree that with all else being equal, that going from a 3 blade to a 5 blade wind turbine would not result in 40% lower RPM's?
I just don't understand how they get the "5 blades turn at 60% of the rotational RPM of a 3 blade turbine".
I can understand the concept of the 5 blade turbine producing more low wind power, but I don't see how it can produce the same power with 60% of the RPM's.
My understanding (maybe it's flawed) is that with all else being equal, the higher RPM's will produce higher power output.
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