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Old 04-22-2022, 02:35 AM
Richard Connell Richard Connell is offline
Join Date: Aug 2006
Location: Sydney Australia
Posts: 362

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?
RV7 VH-XRC Sold :-(
Sydney, AUS
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Old 05-07-2022, 10:39 AM
avrojockey's Avatar
avrojockey avrojockey is offline
Join Date: Aug 2019
Location: Appleton, WI
Posts: 487

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.
Tim Holmes
Appleton, WI
RV-9A N904DC
2022 Dues Paid
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Old 05-18-2022, 12:06 PM
blaplante blaplante is online now
Join Date: Jan 2010
Location: Southern California
Posts: 434
Default And...

And I guess we'll never know!
RV6A in phase 2 as of April 2016
Donation made Oct 2021
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Old 05-19-2022, 06:38 AM
Southern Pete Southern Pete is offline
Join Date: Jul 2015
Location: England
Posts: 171

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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