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Old Mar 01, 2011, 11:05 AM
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United States, CA, Mission Viejo
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"couldn`t get them cycled enough times for break-in"

Hey Knife

Would you mind explaining your break in procedure for the batteries?
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Old Mar 01, 2011, 08:45 PM
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United States, GA, Alpharetta
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Just visited JHH web site. Turbax rotors are now $50.00 plus $8.00 shipping. I guess demand is up and supply is down. Makes me think about buying 11 Dynamax blades for $88 and cutting them down to fit the 4.5 shroud. Anyone tried this yet? I wonder if it would sound more like a turbine?
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Old Mar 01, 2011, 09:15 PM
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you might try tamjets website, i thing i saw something on the about a 120mm and a 110mm with the dynamax rotor . might give a bit of an idea performance wise.
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Old Mar 01, 2011, 09:20 PM
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Trevor
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Canada, SK, Estevan
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The blades on a dynamax are removeable so you would need the hub as well.
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Old Mar 01, 2011, 09:24 PM
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United States, GA, Alpharetta
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I have a whole fan, just needs new blades.
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Old Mar 01, 2011, 10:09 PM
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ok i found some video of tams with a dynamax rotor in a tj120 . performance numbers are close to the 4.5 with turbax rotor. when comparing these two fans the bang for the buck factor is way up on the haoye/turbax.
Tamjets TJ120 BVM Electra video.wmv (6 min 46 sec)
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Old Mar 02, 2011, 04:34 AM
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Finally all the parts arrived. So now it's assembly time
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Old Mar 02, 2011, 05:53 AM
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I like the sound of the TJ120 a lot more. As far as bang for the buck I agree abouth the Haoye/Turbax unless you already have a hub and only need the rotor blades ($60 (with the spinner) Vs. $88 for 11 blades). The Dynamax in the 4.5 will be around 114 MM not 120 like in the TJ, I wonder what impact the smaller size will have on thrust. Maybe I'll just try cutting down the blades I have (they have significant FOD wear and tear) and see what happens. I wonder how many stators the TJ120 has and what effect less stators in the 4.5 will have also.

I guess that is why we experiment...... I'll have to find a safe place to stand in my basement workshop.

Ron
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Old Mar 02, 2011, 01:56 PM
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still waiting on my fan to arrive, can some on verify the outer diameter of the shroud that the ducting fits over on the 4.5 ". i went by hobby city's diameter of 122mm for the shroud but would like a real world measurement . i made the fan end of the ducts with a slight taper so it can be trimmed for a snug fit . wanna get the ducts in so i can plank the fuse. thanks
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Old Mar 02, 2011, 02:08 PM
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Quote:
Originally Posted by ca_fingers View Post
still waiting on my fan to arrive, can some on verify the outer diameter of the shroud that the ducting fits over on the 4.5 ". i went by hobby city's diameter of 122mm for the shroud but would like a real world measurement . i made the fan end of the ducts with a slight taper so it can be trimmed for a snug fit . wanna get the ducts in so i can plank the fuse. thanks
I just messured mine it IS 122 mm
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Old Mar 02, 2011, 02:15 PM
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I just messured mine it IS 122 mm
Very awesome. thanks so much
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Old Mar 02, 2011, 10:52 PM
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dont bother using the stock turbax spinner.....it will vibrate like crazy. your better off without it at this point.


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Finally all the parts arrived. So now it's assembly time
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Old Mar 02, 2011, 11:27 PM
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is jhh the only source for the turbax rotor? quite the price jump on the rotor in the past little while
.
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Old Mar 03, 2011, 12:19 AM
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is jhh the only source for the turbax rotor? quite the price jump on the rotor in the past little while
.
Yeap, supply and demand...at that price I don't think I demand turbax rotors all that much
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Old Mar 03, 2011, 01:00 AM
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when you consider you spend over 100 bucks for a dynamax rotor...that doesnt sound too bad. sure its not hoaye price range....but its not a inefficient amp hog either...and it comes dynamically balanced. by comparison, youll spend 35-40 bucks for a balanced 90mm rotor...
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