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  #11  
Old 03-30-2020, 10:04 PM
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Sam Buchanan Sam Buchanan is offline
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That sounds about right for old-style wheel pants and fairings. You would pick up a few knots with the newer stuff.

Glad you have unlocked the potential of your -6.
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  #12  
Old 03-31-2020, 06:19 AM
Southern Pete Southern Pete is online now
 
Join Date: Jul 2015
Location: England
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You're in the right ball park. Look carefully at the cowling & baffling, do you have blocks on the sides of the cooling air intake ramps on the upper cowl? Is the baffling working well with few leaks? Drag reduction will get you as many knots as power increases or playing with the prop.
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  #13  
Old 03-31-2020, 07:07 PM
ebackscheider ebackscheider is offline
 
Join Date: Aug 2018
Location: Lafollette, TN
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Default cowling

Yes on the upper part of each side. The left side was all cracked out, but I repaired it. How would you check for baffle leaks?
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  #14  
Old 04-01-2020, 08:02 AM
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Snowflake Snowflake is offline
 
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Quote:
Originally Posted by ebackscheider View Post
Yes on the upper part of each side. The left side was all cracked out, but I repaired it. How would you check for baffle leaks?
Look along the baffle seals and along the underside of the cowling where they rub. You should see evidence of continuous contact all around the perimeter, with no "folds" in the baffle seals that would leave an opening where air can get through.
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  #15  
Old 04-01-2020, 09:24 AM
PhatRV PhatRV is online now
 
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Location: Buena Park, California
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Quote:
Originally Posted by ebackscheider View Post
Hey All, I'm new to an RV6 and I have a FP prop with a O360 power plant. I don't know the specs on the prop, but I will get that when I go to the airport next. I also have the old wheel pants and landing gear fairings.

At 2300 rpm I'm getting about 142kts indicated. I hear stories of 160+ kts in a 6, and talked to a guy yesterday that is getting 155 with an O320.

What do I start with to find where I'm bleeding speed from?

Thanks in advance for your thoughts!
Eric
eric at StopFlyingScared dot com
A good reference to compare your RV6 is to compare it to actual tested data from the CAFE foundation. They tested an RV6A and published the data on their website.

https://cafe.foundation/v2/research_aprs.php. Click the RV6A from the list. The test report is in PDF format.
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  #16  
Old 04-01-2020, 12:06 PM
ebackscheider ebackscheider is offline
 
Join Date: Aug 2018
Location: Lafollette, TN
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I appreciate all of the input on this one!

Just to finish off with my prop, I have a Sensenich FP 72M8S9-1-83, but looks to be converted to an 86. So a 72/86 for mine.

I'll be checking the baffling with the next oil change.

Thank You!

Eric
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  #17  
Old 04-01-2020, 12:37 PM
Bavafa Bavafa is offline
 
Join Date: Oct 2007
Location: Sacramento, CA
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Quote:
Originally Posted by ebackscheider View Post
Did a short flight tonight

8,000 ft Density Alt
Turning about 2650 RPM

TAS right at 160 KTS - 184MPH

I don't have a fuel flow yet, so I have no idea where that was. The spike was some issue with the data.



Thanks for the help, I just need to push the throttle forward a bit more I guess.
It is also worth testing and calibrating your TAS calculation. It is not clear if you are doing it manually or thru your instrument. There is an easy 3-way GPS run that will calculate your TAS and confirms its accuracy.
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  #18  
Old 04-01-2020, 12:42 PM
ebackscheider ebackscheider is offline
 
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My numbers were direct from my Dynon HDX. Would that have done my TAS calibration?
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RV6 - N6014Y - Flying
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CFI - Acro in the 6 Rocks!
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  #19  
Old 04-01-2020, 02:15 PM
Bavafa Bavafa is offline
 
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Location: Sacramento, CA
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Quote:
Originally Posted by ebackscheider View Post
My numbers were direct from my Dynon HDX. Would that have done my TAS calibration?
TAS is calculated by the EIFS which uses a few input such as OAT, Density altitude and IAS. The most common source of error comes from IAS. If your static port is at the standard location with the standard VANS provided port which is the head of a pop rivet, then great chances yours is accurate.
But testing with the 3-way GPS method will firm that up.
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  #20  
Old 04-01-2020, 03:16 PM
elev666 elev666 is offline
 
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Location: Kincardine Ont,Can
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One thing you may want to check Eric ;
Is there an RPM restriction on that propeller , I know my CM 70 prop on my RV 6 has a 2600 RPM RED LINE !!
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