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  #1  
Old 12-31-2019, 02:04 PM
sailvi767 sailvi767 is offline
 
Join Date: Sep 2010
Location: Charlotte NC
Posts: 1,388
Default 300 MPH club!

Crazy winds today over the SE.
G



Last edited by DeltaRomeo : 01-01-2020 at 05:16 PM.
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  #2  
Old 12-31-2019, 04:03 PM
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gmcjetpilot gmcjetpilot is offline
 
Join Date: Jan 2005
Posts: 4,576
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Almost 70kts on the tail nice. I can't help but notice the 2690 RPM and 16.3 Gal per hour... Your profile says interested in "6". See six CHT/EGT's... RV-10 w/ IO-540? A 4-Jug Lyc at 72% power can't burn that much dinosaur juice. I never cruise above 2500 RPM (2300-2400 typical) unless in a race or climbing... Pull it back to 2300 and LOP you can save a bunch of fuel...
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Last edited by gmcjetpilot : 12-31-2019 at 04:19 PM.
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  #3  
Old 12-31-2019, 04:07 PM
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burgundyja burgundyja is offline
 
Join Date: Nov 2006
Location: maple grove,mn
Posts: 247
Default tas

195 TAS? What motor?
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  #4  
Old 12-31-2019, 04:12 PM
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Jvon811 Jvon811 is offline
 
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Location: KFNT Central Michigan
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Quote:
Originally Posted by gmcjetpilot View Post
I can't help but notice the 2690 RPM and 16.3 Gal per hour...
Ya do what you have to for bragging rights
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  #5  
Old 12-31-2019, 06:32 PM
sailvi767 sailvi767 is offline
 
Join Date: Sep 2010
Location: Charlotte NC
Posts: 1,388
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I pushed it up to get above 300 mph. The strange thing is we just installed the new panel. The Dynon pitot tube is massive and seems to have slowed the aircraft about 8 knots and is affecting trim. Still trying to sort it out and need to run a triangle to check speeds. I was seeing about 203 true at 2500 RPM. Now I am seeing about 195. The engine runs well LOP at about 11.0 GPH truing about 185.
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  #6  
Old 12-31-2019, 07:15 PM
BillL BillL is offline
 
Join Date: Sep 2007
Location: Central IL
Posts: 6,320
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Quote:
Originally Posted by sailvi767 View Post
Crazy winds today over the SE.
G
Nice speed! I have been wondering about the pitot extension drag, please let me know what you do about it. Pressure recovery fairing?
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  #7  
Old 12-31-2019, 07:32 PM
rocketman1988 rocketman1988 is online now
 
Join Date: Jun 2010
Location: Sunman, IN
Posts: 2,726
Default Pitot

It is highly unlikely that the pitot tube is causing a loss of 8 knots...
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  #8  
Old 12-31-2019, 08:27 PM
sailvi767 sailvi767 is offline
 
Join Date: Sep 2010
Location: Charlotte NC
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Quote:
Originally Posted by rocketman1988 View Post
It is highly unlikely that the pitot tube is causing a loss of 8 knots...
I agree but the aircraft seems to need more aileron trim and not quite as happy trim wise. In addition a ball type ADSB antenna was added on the belly plus two GPS antennas just ahead of the canopy. They were planned to be under the cowling but a late discovery that the cowling had a layer of carbon fiber forced the decision to mount them on the avionics access panel. The tipover further restricted options. We will recess the GPS antennas at a later date. I am also considering relocating the Dynon pitot further inboard. The installer placed it about mid way in front of the aileron because he had easy access with the wingtip removed. Considering moving it about 3 feet inboard near the access panels to limit yaw. It’s a big pitot tube and at rocket speeds may be causing some disturbed air under the aileron in addition to parasite drag.
G
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  #9  
Old 12-31-2019, 11:30 PM
lr172 lr172 is offline
 
Join Date: Oct 2013
Location: Schaumburg, IL
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Quote:
Originally Posted by sailvi767 View Post
The engine runs well LOP at about 11.0 GPH truing about 185.
I am just getting to testing cruise speed, but it seems the majority of 10's are getting around 165 at 11 GPH, at least in the 8-10K altitudes. 185 seems a bit optimistic. Definitely want to check your TAS indication performance. May have a static issue.

Larry
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Last edited by lr172 : 12-31-2019 at 11:32 PM.
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  #10  
Old 01-01-2020, 12:50 AM
PCHunt PCHunt is offline
 
Join Date: Feb 2007
Location: San Diego, CA
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Quote:
Originally Posted by lr172 View Post
I am just getting to testing cruise speed, but it seems the majority of 10's are getting around 165 at 11 GPH, at least in the 8-10K altitudes. 185 seems a bit optimistic. Definitely want to check your TAS indication performance. May have a static issue.

Larry
True, but you can't argue with the Ground Speed !!!
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