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  #11  
Old 04-22-2022, 02:35 AM
Richard Connell Richard Connell is offline
 
Join Date: Aug 2006
Location: Sydney Australia
Posts: 362
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Quote:
Originally Posted by blaplante View Post
Run a 3 leg GPS test and plug it into the NTPS spreadsheet. [Search the forums...]
That will give you actual ground speed not some +/- 5% airspeed....
This ^^
This is the first step. Have you done anything non standard with the static ports?
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RV7 VH-XRC Sold :-(
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  #12  
Old 05-07-2022, 10:39 AM
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avrojockey avrojockey is offline
 
Join Date: Aug 2019
Location: Appleton, WI
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Quote:
Originally Posted by Richard Connell View Post
This ^^
This is the first step. Have you done anything non standard with the static ports?
Richard and blaplante are correct...I had non-standard ports and there was almost a 10Kt error. 3-4 leg NTPS will reveal any error.
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  #13  
Old 05-18-2022, 12:06 PM
blaplante blaplante is offline
 
Join Date: Jan 2010
Location: Southern California
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Default And...

And I guess we'll never know!
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  #14  
Old 05-19-2022, 06:38 AM
Southern Pete Southern Pete is offline
 
Join Date: Jul 2015
Location: England
Posts: 171
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The basic checks are,

1. Do you have the Van's static ports? If no then your static reference will account for most of the error. It is the outside shape that is critical, doesn't matter how you hook up to the tubes inside. Verify by using the GPS calibration method.
2. Calibrate your tacho and fuel flow.

If you are really turning the Sensenich prop 2400 or 2500rpm and have all your fairings installed and straight then you should be achieving close to Van's posted speeds.
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