Electric Training If you are new to electric learn more about them here or ask questions.

Propeller Pitch Speed vs Level Flight Speed

Reply

Old 12-23-2014, 06:48 AM
  #1  
mark IX
Thread Starter
My Feedback: (9)
 
Join Date: Mar 2003
Location: Torrington, CT
Posts: 288
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Propeller Pitch Speed vs Level Flight Speed

What is the relatonship between prop pitch speed and model level flight speed?

Thanx, Mark
mark IX is offline  
Reply With Quote
Old 12-23-2014, 07:37 AM
  #2  
daveopam
My Feedback: (9)
 
daveopam's Avatar
 
Join Date: Oct 2002
Location: ELK CITY, OK
Posts: 7,440
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Sorry Mark. Way too many variables. As an example a thick wing profile or 3D only plane turning a 13x8 at 11,000 RPM will have more slippage than a pattern type plane with retracts and a thin airfoil turning the same prop at the same RPM. There is probably a formula if you knew the CD of a particular airframe. It's way over my head if so. You might ask some of the guys in the aerodynamics forum if you don't get an answer here.

David
daveopam is offline  
Reply With Quote
Old 01-02-2015, 09:57 PM
  #3  
aeajr
My Feedback: (2)
 
aeajr's Avatar
 
Join Date: Jan 2003
Location: Long Island, NY
Posts: 8,567
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Originally Posted by mark IX View Post
What is the relatonship between prop pitch speed and model level flight speed?

Thanx, Mark
Pitch speed is the calculated speed of a propeller moving through the air at a given RPM with ABSOLUTELY NO SLIPPAGE IN THE AIR. It is a theoretical number that could only be achieved if the aircraft had no wind resistance.

It is like climate and weather.

Climate is what you expect.
Weather is what you get.

Your actual airspeed will not exceed your pitch speed in level flight and will normally be less, as per my statement above.
aeajr is offline  
Reply With Quote

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 Archive Advertising Cookie Policy Privacy Statement Terms of Service