Go to Post We love both AndyMark and Vex for everything they do. The work these folks put into their products is amazing. - marshall [more]
Home
Go Back   Chief Delphi > FIRST > General Forum
CD-Media   CD-Spy  
portal register members calendar search Today's Posts Mark Forums Read FAQ rules

 
 
 
Thread Tools Rating: Thread Rating: 3 votes, 5.00 average. Display Modes
Prev Previous Post   Next Post Next
  #12   Spotlight this post!  
Unread 04-01-2009, 11:57
minisimon's Avatar
minisimon minisimon is offline
Registered User
AKA: Simon Helmore
FRC #0238
Team Role: Mentor
 
Join Date: Jun 2001
Rookie Year: 2000
Location: Manchester, NH
Posts: 14
minisimon will become famous soon enoughminisimon will become famous soon enough
Re: Hovercraft

This question has been vexing me as well. My good friend (http://en.wikipedia.org/wiki/Propeller) tells me that propellers max out around 80% efficiency. I'm afraid that we won't get anywhere near an optimum prop, so let's assume 10% efficiency with 300W of CIM, yielding 30 W. When your robot is moving at 2 m/s, 30 W should translate to 15 N, about 3 lbs. If you power your fan or fans with 2 CIMS, you get 6 lbs of thrust, which would make a nice adder to the 7.5 lbs you get from traction.

Now, if someone who knew what they were doing made the prop a mere 30% efficient, then they would have an additional 18lbs of thrust; enough to push anyone around.

Unfortunately, I have no idea where you would purchase or how you would design this propeller. There are some big RC planes out there, but I can't find much information on thrust produced or efficiency. Anybody have any leads?
Reply With Quote
 


Thread Tools
Display Modes Rate This Thread
Rate This Thread:

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

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
pic: Hovercraft cart ChristinaR Extra Discussion 41 09-04-2008 02:24
Hovercraft? jennpeeler Rules/Strategy 19 25-10-2006 19:46
Hovercraft edomus General Forum 24 02-06-2005 21:00
pic: Hovercraft edomus Extra Discussion 11 01-06-2005 11:55


All times are GMT -5. The time now is 20:08.

The Chief Delphi Forums are sponsored by Innovation First International, Inc.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright © Chief Delphi