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General Discussion A place to talk about anything R/C or otherwise.

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  #11  
Old 2019-05-08
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Ricardo Ricardo is offline
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Or 4x50mm... More scale!
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  #12  
Old 2019-05-09
MichaelLevy MichaelLevy is offline
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It may be more scale but there is a downside. I doubt 4 50mm fans will give you as much thrust as two 70mm. I don't rely on the manufacturers' data, they don't reflect actual "in plane" performance. I tested both the Freewing and Powerfun 70 mm units in plane and get around 1400 to 1500 gm static thrust on 6S. You'll be lucky to get 500gm from a 50 mm fan unit. They also sound a lot better than 50mm units...unless you like the sound of a dentist's drill . They are also factory dynamically balanced which is a huge advantage over doing it yourself. Also smaller fans are more inefficient which means your battery won't last as long in flight,and there's also the complexity. The thrust tube can be flattened toward the exhaust end so as not to affect the scale look. That's what I did in one of my planes. It doesn't affect the thrust.

Last edited by MichaelLevy; 2019-05-09 at 09:01 AM.
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  #13  
Old 2019-05-09
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drgilo1973 drgilo1973 is offline
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here also 2 more planes
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  #14  
Old 2019-05-09
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Michael O'Bree Michael O'Bree is offline
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Very impressive.

Does your printer ever rest?!

Air France or BA colours for the Concorde?
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  #15  
Old 2019-05-09
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drgilo1973 drgilo1973 is offline
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my printer is on full action , actually i changed filament coz i didint have enough white so i switched to red , but soon i ll came back to white
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  #16  
Old 2019-05-09
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Quote:
Originally Posted by MichaelLevy View Post
It may be more scale but there is a downside. I doubt 4 50mm fans will give you as much thrust as two 70mm. I don't rely on the manufacturers' data, they don't reflect actual "in plane" performance. I tested both the Freewing and Powerfun 70 mm units in plane and get around 1400 to 1500 gm static thrust on 6S. You'll be lucky to get 500gm from a 50 mm fan unit. They also sound a lot better than 50mm units...unless you like the sound of a dentist's drill . They are also factory dynamically balanced which is a huge advantage over doing it yourself. Also smaller fans are more inefficient which means your battery won't last as long in flight,and there's also the complexity. The thrust tube can be flattened toward the exhaust end so as not to affect the scale look. That's what I did in one of my planes. It doesn't affect the thrust.
Yes Michael, you are right, the sound is quite differente,...I have A 50mm FMS 3S version, with 3S 850mAhLipo(75C), it gives me 720g thrust first seconds, than around 680gr on 32 Amps...Quite interesting looking in Wheight to thrust ratio...(EDF+ESC+LIPO=200gr)
And my test was just blowingair on the scale...my be more with a real thrust mesurements device.
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  #17  
Old 2019-05-09
MichaelLevy MichaelLevy is offline
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Quote:
Originally Posted by Mezri View Post
Yes Michael, you are right, the sound is quite differente,...I have A 50mm FMS 3S version, with 3S 850mAhLipo(75C), it gives me 720g thrust first seconds, than around 680gr on 32 Amps...Quite interesting looking in Wheight to thrust ratio...(EDF+ESC+LIPO=200gr)
And my test was just blowingair on the scale...my be more with a real thrust mesurements device.
Correct. I get similar results, but the rule of thumb is that you lose about one third of thrust once the unit is in the plane (see link below). So that means 680gm becomes 453 gm in real life! As far as sound, my pre-balanced 6S 70 mm Powerfun Fan motor combo unit sounds the closest to a jet turbine than anything I have ever had before. Light weight, lots of power, no vibrations at all no motor sound.

https://www.rcgroups.com/forums/show...70mm-fan/page2
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  #18  
Old 2019-05-09
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Florin Florin is online now
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This video shows the easy way to measure the thrust
https://youtu.be/okpUOxTpLb8?t=800
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