Go Back  RCU Forums > RC Boats > Speed - RC Nitro Boats
Reload this Page >

2 blade prop VS 3blade prop... what's the diff?

Notices
Speed - RC Nitro Boats For all your rc nitro fuel burning boating needs.

2 blade prop VS 3blade prop... what's the diff?

Old 03-07-2005, 04:49 AM
  #1  
desertbuzz
Senior Member
Thread Starter
 
desertbuzz's Avatar
 
Join Date: Sep 2004
Location: cairo, EGYPT
Posts: 245
Likes: 0
Received 0 Likes on 0 Posts
Default 2 blade prop VS 3blade prop... what's the diff?

I always see among the recomended props a 2 blade and a 3 blade from the same size.

Which is better? What's the performance difference between both?[sm=confused.gif]
Old 03-09-2005, 03:30 AM
  #2  
desertbuzz
Senior Member
Thread Starter
 
desertbuzz's Avatar
 
Join Date: Sep 2004
Location: cairo, EGYPT
Posts: 245
Likes: 0
Received 0 Likes on 0 Posts
Default RE: 2 blade prop VS 3blade prop... what's the diff?

Hey all you pros...where are you?
Old 03-09-2005, 06:01 AM
  #3  
piper_chuck
My Feedback: (12)
 
piper_chuck's Avatar
 
Join Date: Jun 2004
Location: Columbia, SC
Posts: 8,044
Likes: 0
Received 0 Likes on 0 Posts
Default RE: 2 blade prop VS 3blade prop... what's the diff?

I'm far from a pro, but I'll share what I learned. A long, long time ago, I compared the performance of 2 and 3 blade props on a k&B 3.5cc outboard. The 3 blade prop was slower and had an increased tendency to cavitate in the turns. It was also much more of a pain in the butt to balance. So, after much work polishing and balancing, and then playing with the engine setup, the 3 blade prop went in the prop case where it remains today.

If you check out some of the airplane forums, you will find that 3 blade props are widely accepted as being less efficient. As with airplanes, the only time I would use more than 2 blades on a boat is if clearance was an issue.
Old 03-11-2005, 05:59 PM
  #4  
DMACK
Senior Member
My Feedback: (9)
 
DMACK's Avatar
 
Join Date: Mar 2004
Location: San Francisco, CA
Posts: 140
Likes: 0
Received 0 Likes on 0 Posts
Default RE: 2 blade prop VS 3blade prop... what's the diff?

There is a difference in speed, as a two blade will push you boat a little faster than a three blade - a little faster. The reason they are usually used is that they tend to be much more smooth through the corners. My C cat for example has so much speed it can barely handle it. with a threee blade there is practically no difference in straight line speed, but I can use more power in the turms than I can with the two blade. I even have a couple four blade props. More blades means there is always a blade in contact with the water, so the power is transferred more smoothly.

If you are having trouble getting through the corners, especially in rough water, a three blade prop may be for you!

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


Thread Tools
Search this Thread

Contact Us - Manage Preferences - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.