which is better a prop or ducted fan?  
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All Forums >> RC Boats >> RC Airboats >> which is better a prop or ducted fan?
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which is better a prop or ducted fan? - 7/6/2008 4:39:22 PM   
kyosho501x


 

Posts: 8
Joined: 6/8/2008
From: Carrollton, TX, USA
Status: offline 		im working on a air boat and i need to find out if a prop or ducted fan will create the strongest thrust, im gonna be using a 540 motor(14t triple), if you can give me a link to the reconmended products, that would be great!
       Post #: 1

RE: which is better a prop or ducted fan? - 7/6/2008 10:51:12 PM   
nitrosportsandrunner



Posts: 1258
Joined: 9/1/2007
From: skowhegan, ME, USA
Status: offline 		most of the ducted fans iv looked at use brushless motors. iv too wondered if a ducted fan would be better for a airboat. i suppose size would be a factor. its not hard to get a 10'' prop on a 540 motor, but iv not seen any ducted fans that large.

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RE: which is better a prop or ducted fan? - 7/6/2008 11:12:14 PM   
kyosho501x


 

Posts: 8
Joined: 6/8/2008
From: Carrollton, TX, USA
Status: offline 		would a ducted fan even work since they pull? and what kv brushless motor should bring my boat to around 30mph or faster with 7.2v 6cell nimh?

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       Post #: 3

RE: which is better a prop or ducted fan? - 7/7/2008 2:27:16 AM   
nitrosportsandrunner



Posts: 1258
Joined: 9/1/2007
From: skowhegan, ME, USA
Status: offline 		im using a puller prop on my electric boat right now: http://www.youtube.com/watch?v=FoDwDDKafwM
its a 20t motor and a 10X6 prop. i have a 10X8 prop coming in the mail soon, i hope that will increase the speed more. the real problem with using brushed motors it the runtime. with a 7.2v 3300mah battery i get just 4:30 runtime. a brushless motor and good lipo batt would increase runtimes alot.

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RE: which is better a prop or ducted fan? - 7/7/2008 2:42:02 AM   
kyosho501x


 

Posts: 8
Joined: 6/8/2008
From: Carrollton, TX, USA
Status: offline 		well im gonna get a ducted fan,but i dont know if the fan is too powerful cause it has 900grams of thrust so that should be more than enough

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       Post #: 5

RE: which is better a prop or ducted fan? - 7/7/2008 2:34:43 PM   
nitrosportsandrunner



Posts: 1258
Joined: 9/1/2007
From: skowhegan, ME, USA
Status: offline 		hey, i found a vid of a airboat using a ducted fan witha brushless motor. the ducted fan snaps off, but the fact that it moved so quickly on land should mean that it will go much faster in water. his boat it pretty small, so, you may want to make your simillar.
http://youtube.com/watch?v=g2Df_3Td_HQ

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RE: which is better a prop or ducted fan? - 7/7/2008 3:56:57 PM   
kyosho501x


 

Posts: 8
Joined: 6/8/2008
From: Carrollton, TX, USA
Status: offline 		oh yeah i saw that..............

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       Post #: 7

RE: which is better a prop or ducted fan? - 7/7/2008 4:47:36 PM   
mjderstine


 

Posts: 224
Joined: 4/11/2007
From: daytona beach, FL, USA
Status: offline 		that didnt last too long...


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RE: which is better a prop or ducted fan? - 7/10/2008 4:48:49 PM   
pinky_d_brain


 

Posts: 170
Joined: 10/28/2005
From: Yellowknife, NT, CANADA
Status: offline 		im working on a duct fan air boat right now its taking a long time (not much time to wrok on it) but its coming along




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RE: which is better a prop or ducted fan? - 7/10/2008 5:22:44 PM   
nitrosportsandrunner



Posts: 1258
Joined: 9/1/2007
From: skowhegan, ME, USA
Status: offline 		pinky, that boat looks great. id say it will be pretty fast, as the overall size is small and the battery/motor will have good power. looks like all you need is to wire things up and make a rudder/linkage and cover the top of the hull and your done.

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       Post #: 10

RE: which is better a prop or ducted fan? - 7/10/2008 6:13:00 PM   
crispyspa



Posts: 807
Joined: 11/2/2004
From: onalaska, WI, USA
Status: offline 		Pinky is da' man! All his boats look great and perform really well. ( I hope I didn't jinx it) *biting nails*

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RE: which is better a prop or ducted fan? - 7/10/2008 6:17:24 PM   
mr. ilikehelp


 

Posts: 292
Joined: 7/19/2007
From: mpls, MN, USA
Status: offline 		thats sweet some one should build with a twin ducted fan and giv epower to iether fan to turn

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       Post #: 12

RE: which is better a prop or ducted fan? - 7/10/2008 6:20:27 PM   
pinky_d_brain


 

Posts: 170
Joined: 10/28/2005
From: Yellowknife, NT, CANADA
Status: offline 		Yup its a 3c lipo with a 4900kv motor be about 50,000 rpm with about 2lb of thrust efficient speed up to 200mph
Aiming for 1.5lb boat total when done all gear only ways about .5lb so I think it’s doable
O ya its only 10" long by 6" wide I cant what to see what happens

Duct Fans need a high rpm so if your motor is a low Kv I would go with a prop you will get more out of it

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RE: which is better a prop or ducted fan? - 7/11/2008 6:06:56 PM   
mr. ilikehelp


 

Posts: 292
Joined: 7/19/2007
From: mpls, MN, USA
Status: offline 		wow thats a small boat with lots of thrust should run great. if you put so0me wings on it could be a plane for that size of a hull.
is the hull 100% balsa?

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       Post #: 14

RE: which is better a prop or ducted fan? - 7/11/2008 6:42:29 PM   
pinky_d_brain


 

Posts: 170
Joined: 10/28/2005
From: Yellowknife, NT, CANADA
Status: offline 		Yes it is all balsa I will be installing a ply transom and covering inside and out with epoxy

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