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  #21  
Old 04-01-2020, 05:23 PM
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Sam Buchanan Sam Buchanan is offline
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Quote:
Originally Posted by elev666 View Post
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 !!
No restriction on the O-360 prop.
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  #22  
Old 04-02-2020, 07:10 PM
Zazoos Zazoos is offline
 
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Location: Gladewater
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Seems like i have much room for improvement, but not sure where to start.


Gear leg fairings and wheel pants installed.
Ground Adjustable Sensenich Prop on Pin setting 4. Gets right at 2700 rpm with full throttle and leaned.
Lycoming 0-320 E2A 160HP
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Last edited by Zazoos : 04-02-2020 at 07:17 PM.
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  #23  
Old 04-03-2020, 09:46 AM
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Raymo Raymo is offline
 
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With those CHTs on #1 and #2, I'd start looking for baffling improvements. Also, the #3 and 4 EGT and CHTs are very different than 1 and 2, likely due to poor fuel/air distribution but might also be an induction leak or leaks in play.

Suggest uploading your Dynon data to Savvy Analysis for others to review. They also have a flight test you can run to help determine your spreads and ignition health.

Also, you have your volts in the yellow at 14.3. That is where it should be and ought to be green up to 14.6 or so.
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RV-7A - Slider - N495KL - First flt 27 Jan 17
O-360-A4M w/ AFP FM-150 FI, Dual PMags, Vetterman Trombone Exh, SkyTech starter, BandC Alt (PP failed after 226 hrs)
Catto 3 blade NLE, FlightLines Interior, James cowl, plenum & intake, Anti-Splat -14 seat mod and nose gear support
All lines by TSFlightLines (aka Hoser)

Last edited by Raymo : 04-03-2020 at 09:49 AM.
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  #24  
Old 04-03-2020, 05:06 PM
rvsxer rvsxer is offline
 
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Location: Inver Grove Hgts, MN
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When my RV-6 still had the Sensenich 72FM prop, pitched at 85", O-360 180 hp, I could get 179 kts TAS at 8,000' DA. The IAS has been calibrated and reads about 2 kts high at that speed so let's say 177 kts (204 mph) TAS. Van's currently claims 210 mph with the current fairings. That was wide open at about 2710-2720 rpm, leaned for best power. I still have the old style wheel fairings and Whelen nav/strobe lights hangin' out in the breeze. You should be able to do a little better than what you are seeing now. To check your IAS accuracy you can use your GPS and this website: http://www.csgnetwork.com/tasgpscalc.html. Kevin Horton found this years ago and felt it was accurate enough for our needs.
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  #25  
Old 04-04-2020, 07:55 AM
sailvi767 sailvi767 is offline
 
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Location: Charlotte NC
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Vans specs for the RV6 with 180HP are 173 kt or 199 MPH cruise. 210 MPH is VNE on the 6.
G
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  #26  
Old 04-04-2020, 09:16 AM
Boyd Birchler Boyd Birchler is offline
 
Join Date: Sep 2014
Location: IN
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Just flew formation at 5500 feet yesterday in my RV7 (180 w/CS prop) with a RV6 (160 w/FP 80" pitch metal Sensenich).

I could easily out climb him but when level at 5500 we were both using 7.9 GPH at a TAS of 159 to 161 knots or give or take 185 MPH.

The 6 with his 80" pitch was turning 2350 RPM. The 6 is a very efficient airplane! Pitch makes a lot of difference in the RPM needed for a given speed.
At 8000 feet you may need to turn past redline to get to 75% if you have a climb pitch prop. What that pitch is, for climb,standard or cruise; may be very different from prop maker to prop maker, to achieve the same results.
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  #27  
Old 04-04-2020, 01:05 PM
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Sam Buchanan Sam Buchanan is offline
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Quote:
Originally Posted by Boyd Birchler View Post
Just flew formation at 5500 feet yesterday in my RV7 (180 w/CS prop) with a RV6 (160 w/FP 80" pitch metal Sensenich).

I could easily out climb him but when level at 5500 we were both using 7.9 GPH at a TAS of 159 to 161 knots or give or take 185 MPH.

The 6 with his 80" pitch was turning 2350 RPM. The 6 is a very efficient airplane! Pitch makes a lot of difference in the RPM needed for a given speed.
At 8000 feet you may need to turn past redline to get to 75% if you have a climb pitch prop. What that pitch is, for climb,standard or cruise; may be very different from prop maker to prop maker, to achieve the same results.
2350 sounds low, probably about 50-60% power at that altitude. I would expect at least 2500 rpm for 160kts true with 80" pitch.
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  #28  
Old 04-04-2020, 01:06 PM
Sam Buchanan's Avatar
Sam Buchanan Sam Buchanan is offline
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Join Date: Dec 2004
Location: North Alabama
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Quote:
Originally Posted by Boyd Birchler View Post
Just flew formation at 5500 feet yesterday in my RV7 (180 w/CS prop) with a RV6 (160 w/FP 80" pitch metal Sensenich).

I could easily out climb him but when level at 5500 we were both using 7.9 GPH at a TAS of 159 to 161 knots or give or take 185 MPH.

The 6 with his 80" pitch was turning 2350 RPM. The 6 is a very efficient airplane! Pitch makes a lot of difference in the RPM needed for a given speed.
At 8000 feet you may need to turn past redline to get to 75% if you have a climb pitch prop. What that pitch is, for climb,standard or cruise; may be very different from prop maker to prop maker, to achieve the same results.
2350 sounds low, probably about 50-60% power at that altitude. I would expect at least 2500 rpm for 160kts true with 80" pitch. I've been flying the metal Sensenich 80" for nearly two decades (RV-6, 160 hp).
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  #29  
Old 04-04-2020, 02:24 PM
jliltd jliltd is online now
 
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Location: Rancho San Lorenzo
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I run my 160hp O-320 on my RV-3B at 2650 rpm with a Catto three bladed prop. The design redline on the prop is 3300 rpm. At 2650 rpm I get 200mph smooth as a sewing machine. At 2300 rpm (like your test) I get 165 mph. When i started flying the 3 I thought it was slow. After talking to other RV owners and Catto I discovered I was operating the engine way too slow. I was treating it like a Cherokee or Cessna trainer rather than a balanced sport plane. My O-320 loves 2650 rpm and it really comes alive above 2600. I have no idea what kind of fuel burn I get. I have a totalizer but rarely check it.
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  #30  
Old 04-04-2020, 02:49 PM
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plehrke plehrke is offline
 
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My speeds for my 6A with 180 hp and FP Sensenich 85” pitch prop are found in this thread
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Last edited by plehrke : 04-04-2020 at 05:01 PM.
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