Newbie- Ducted prop vs fan?  
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All Forums >> Electric Aircraft Universe >> Electric RC Jets >> Newbie- Ducted prop vs fan?
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Newbie- Ducted prop vs fan? - 8/21/2003 6:30:38 PM   
rdeis


 

Posts: 88
Joined: 8/2/2003
From: Colorado Springs, CO, USA
Status: offline 		Saw this in another thread:

[QUOTE]I would use 2 large geared motors turning two ducted props. Which produces much better static thrust on less juice than a ducted fan. [/QUOTE]

I took a quick look at motor stats on GWS, and sure enough the quote a lot more thrust out of their 300 motor as an EDP than an EDF, even with a 45mm prop (which I think is close to the same size as the 50mm fan unit..)

Question is why? And if that's true, then why ever use a fan instead of prop in the duct? Is it that static thrust and thrust at flight speeds are different?
       Post #: 1

RE: Newbie- Ducted prop vs fan? - 12/19/2003 1:22:38 AM   
finchero


 

Posts: 189
Joined: 8/10/2003
From: delaware
Status: offline 		I also have been trying to find the answer to this question. My electric home built ddust hybrid is fast(85-100mph) with a mega 16/15/3 and 4s2p lithium polymer, but how can it be a faster plane with an edf with the same cell count battery pack. my setup pushes out about 40ounces static thrust and pitch speed or 79mph, all my calculations with a edf are much smaller in the area of static thrust, but seem to have a much higher pitch speed?

very good question someone with experience please help out a couple of newbie edf hobbyist, thanks

< Message edited by finchero -- 12/19/2003 1:23:14 AM >

(in reply to rdeis)
       Post #: 2

RE: Newbie- Ducted prop vs fan? - 1/16/2004 5:12:25 AM   
SlyPilot



Posts: 16
Joined: 1/15/2004
From: Denver, CO, USA
Status: offline 		Me too. I purchased a standard GWS ducted moter/fan unit thinking I would retro fit it into one of my wrecked planes, but after looking up the thrust output - I bailed out of that idea. Now I think I need two Ducted fans to make it worthwhile.

Prop vs ducted fan. my guess:
I would expect the tip wash-out to be better in a ducted environment vs the open air turbulance around a prop, so perhaps it's stronger in that there is less extraneous drag around it's thrust line/vector.

(in reply to rdeis)
       Post #: 3

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