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  #1  
Old 02-26-2018, 02:22 PM
N661DJ N661DJ is offline
 
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Location: Winter Haven
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Default RV-6 prop ??

I have an RV-6, 0-360 A1A, 180 HP. equipped with a Sensenich (72 FM859-1-83)
It appears that this is a climb prop. as the airplane climbs really well. The top speed however is a little lacking. My question, is this the recommended prop for this airplane?, would an 84" or 85" pitch be better and has anyone had any experience having this model prop "Twisted" or re-pitched??
Dick
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  #2  
Old 02-26-2018, 02:35 PM
Raymo's Avatar
Raymo Raymo is offline
 
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What is your static RPM? Typical is 2200-2300, depending on pitch for cruise or climb and prop/engine setup. My 3 blade Catto, for example, is around 2200 RPM static. On take-off, I look for 2250 while rolling down the runway. I can just get to 2700 RPM at WOT. I did a run yesterday after tweaking the configuration of my P-Mag with my computer and EICAD program. At 5700 feet, WOT and 2700 RPM I achieved 168 KTAS.

I need more HP and aerodynamic cleanup but happy with the prop. Also, gear fairings and wheel pants make a huge difference in top speed.
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Last edited by Raymo : 02-26-2018 at 03:03 PM.
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  #3  
Old 02-26-2018, 02:49 PM
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az_gila az_gila is offline
 
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Sensenich rates the -83 pitch prop as a "standard" for a 180 HP RV-6(A) and the -85 as a "climb" prop

http://www.sensenich.com/files/docum...1349891787.pdf

Vans now shows the -85 as a standard prop on their web site

https://www.vansaircraft.com/cgi-bin...oduct=sen-prop.

Like you, I have a -83 pitch Sensenich prop and even at our higher DA's I'm finding it to be much more of a climb prop than a standard prop.

This is from my flight test notes -

12500 ft ( 14600 DA ) 2710 rpm – 12.9 gph – 168 kts TAS ( 193 mph ) – FULL THROTTLE – 58% pwr

A lot of references seem to like full throttle to equal 2700 rpm at a cruise altitude of 8000 ft. The prop on my Tiger is set up this way by the POH.

It may be that later -6 planes are a bit more aerodynamic than earlier ones due to improvements in gear fairing design.

Static rpm is specific to prop design and is 2050 to 2250 as defined by Sensenich in the above link.
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Last edited by az_gila : 02-26-2018 at 02:58 PM.
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  #4  
Old 02-26-2018, 04:10 PM
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Sam Buchanan Sam Buchanan is offline
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Quote:
Originally Posted by N661DJ View Post
I have an RV-6, 0-360 A1A, 180 HP. equipped with a Sensenich (72 FM859-1-83)
It appears that this is a climb prop. as the airplane climbs really well. The top speed however is a little lacking. My question, is this the recommended prop for this airplane?, would an 84" or 85" pitch be better and has anyone had any experience having this model prop "Twisted" or re-pitched??
Dick
I had the Sensenich metal prop on my O-320 RV-6 repitched by a local prop shop (went from 77" to ~80"). However, I suggest you return the prop to Sensenich for repitching because their equipment is better than what will be found in a smaller shop.
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  #5  
Old 02-26-2018, 04:18 PM
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RV8JD RV8JD is offline
 
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The process as Sam explains in the link to his post on repitching his prop, but a video is worth a 100 pictures.

"Gotta get more leg into it!"

https://youtu.be/VUKKLqcwd9o
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Last edited by RV8JD : 02-26-2018 at 04:39 PM.
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  #6  
Old 02-26-2018, 06:58 PM
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N941WR N941WR is offline
 
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Just call Catto and be done with it.
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  #7  
Old 03-03-2018, 07:41 AM
Christopher Murphy Christopher Murphy is offline
 
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Default There are other great props too

Quote:
Originally Posted by N941WR View Post
Just call Catto and be done with it.
Get your prop dialed in and it will be a great prop. Catto props are nice but there are other props that perform well too.

Cm
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  #8  
Old 03-03-2018, 11:22 AM
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mike newall mike newall is offline
 
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I fly a buddy's RV6 with a 180hp motor. It has a Prince P Tip prop and I must admit, I am a huge fan.

I have an RV7 with 180hp and MT 3 blade c/s prop which is a very good performer but his 6 is faster in cruise !

His gets out of 1200' strips no problem. When I did the pre buy on it, I was sceptical but can honestly say I am impressed.
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