Wattflyer RC Network: RC Universe :: RCU Magazine :: RCU Forums :: RCU Classifieds :: RCU User Reviews :: RCU YouTube
Home Who's Online Calendar Today's Posts RealTime Post Spy Mark Forums Read
Go Back   WattFlyer RC Electric Flight Forums - Discuss radio control eflight > Electric R/C Airplanes > Beginners
Register Members List Wattflyer Extras Articles Search Today's Posts Mark Forums Read Social Groups

Beginners New to e-power flying? Get the low down in here from experienced e-power RC pilots!

Thank you for your support (hide ads)
Reply
 
Thread Tools Display Modes
Old 04-21-2011, 07:10 AM   #1
siansoft
New Member
 
Join Date: Jan 2010
Posts: 2
Thanked 0 Times in 0 Posts
iTrader: (0)
Friends: (0)
Question Propeller Size 3 Blades and 2 Blades

Hi all

I have a motor KV = 560 and requierd propeller 15 x 8 2 blades it's look to big on my plane so I am looking to change the propeller to 3 blades propller to look smaller
What is the size of 3 blades propller I can use to my motor? and is it better to use 3 blades or 2 blades with KV 560 motors? and what is the diffrent between 3 blades and 2 blades?

Thank You All
siansoft is offline  
  Reply With Quote
Old 04-21-2011, 08:39 AM   #2
slipstick
Super Contributor
 
Join Date: Oct 2005
Location: N.Staffs, UK
Posts: 2,350
Thanked 197 Times in 191 Posts
Awards Showcase

Outstanding Contributor Award 
iTrader: (0)
Friends: (1)
Default

The general rule is when changing from 2 blades to 3 you reduce the diameter by 10% and leave the pitch alone. So a 15x8x2 would be 13.5x8x3. That will give you effectively the same load on the motor.

2 blade props are generally slightly more efficient than 3 blades but at the size/power you're using it will make very little practical difference.

Of course if you just want a smaller prop but the same power another way of acheiving it is to use a battery with more cells. More cells, more revs, smaller prop.

Steve
slipstick is offline  
  Reply With Quote
Old 04-21-2011, 12:25 PM   #3
siansoft
New Member
 
Join Date: Jan 2010
Posts: 2
Thanked 0 Times in 0 Posts
iTrader: (0)
Friends: (0)
Question

Originally Posted by slipstick View Post
The general rule is when changing from 2 blades to 3 you reduce the diameter by 10% and leave the pitch alone. So a 15x8x2 would be 13.5x8x3. That will give you effectively the same load on the motor.

2 blade props are generally slightly more efficient than 3 blades but at the size/power you're using it will make very little practical difference.

Of course if you just want a smaller prop but the same power another way of acheiving it is to use a battery with more cells. More cells, more revs, smaller prop.

Steve
My battery is 4 cells and the prop that I use now is 12x10x2 but when use this prop my motor ,ECS 80A and the battery is getting heated too much because I think the
problem is the size of the prop and i can't increase the prop size to 15x8x2 this is the motor manufacture requirement because it will touch the ground that why I decide to use 3 blades prop so do I have to increase the battery volte to make the motor and all my electric to reduce the heat?
siansoft is offline  
  Reply With Quote
Old 04-21-2011, 01:31 PM   #4
slipstick
Super Contributor
 
Join Date: Oct 2005
Location: N.Staffs, UK
Posts: 2,350
Thanked 197 Times in 191 Posts
Awards Showcase

Outstanding Contributor Award 
iTrader: (0)
Friends: (1)
Default

If your motor, ESC and battery are overheating on a 4S pack and 12x10 prop then a bigger prop or more volts will just make it all MUCH WORSE !

It would help if you gave some details of what motor you're talking about (we're not very good at mind-reading ). For now I'll just guess that the manufacturer probably intended the 15x8 prop to be use with a 3S battery NOT 4S.

Steve
slipstick is offline  
  Reply With Quote
Reply

  WattFlyer RC Electric Flight Forums - Discuss radio control eflight > Electric R/C Airplanes > Beginners

« Previous Thread | Next Thread »

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +1. The time now is 10:16 AM.


Powered by: vBulletin
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright 2005 WattfFlyer.com
RCU Eflight HQ

Charities we support Select: Yorkie Rescue  ::  Crohn's & Colitis Foundation



Page generated in 0.14425 seconds with 24 queries