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02-23-2017, 10:13 AM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
Originally Posted by airguy
Ok, you might win bragging rights on that one for now - but just let me get my injector orifices (orificii?) dialed in and we'll play a little... 
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Only I'm carbureted.
Quote:
Originally Posted by airguy
In any case, I get asked all the time what kind of efficiency I get and I normally respond with "I flight plan 160 knots true at 8 gph." More than once I've been called a liar straight to my face. I just shrug my shoulders and smile, it's not my job to make believers out of the spam-canners.
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I hear you! I love give give them rides and watching their mouths drop wide open!
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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02-23-2017, 10:18 AM
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Join Date: Sep 2011
Location: Edgewater, FL. KSFB
Posts: 1,118
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I have the little IO-320, not the larger 180hp like some of you but I cruise at 155 kts TAS and lean back to get that. My GPH varies with altitude. Most times my altitude is determined by whether I brought the O2, how far I am going and weather. My TAS does not change with altitude only GPH. I can and do go to 12k or so and regularly see 5.8-5.9gph at that altitude. I can stay around 8.5k and still be around 6.5 GPH and 155 TAS. As Bill says, I love this wing.
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02-23-2017, 10:23 AM
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Join Date: Jan 2016
Location: Southwest
Posts: 1,120
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Wow
Mark,
This is what i was hoping for in selecting the 9: speed the same up high but lower fuel flow. Thanks for the data. This is great stuff.
Need to find what Catto prop you have!
__________________
John S
WARNING! Information presented in this post is my opinion. All users of info have sole responsibility for determining accuracy or suitability for their use.
Dues paid 2020, worth every penny
RV9A- Status:
Tail 98% done
Wings 98% done
Fuselage Kit 98% done
Finishing Kit 35% canopy done for now
Electrical 5% in work
Firewall Forward 5% in work
www.pilotjohnsrv9.blogspot.com
Last edited by PilotjohnS : 02-23-2017 at 10:26 AM.
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02-23-2017, 10:47 AM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Greg & Mark,
You two bring up a good point, the -9 doesn't really need the (I)O-360 to be a good performer. It's beauty is in its ability to cruise efficiently, which is exactly what Van hand in mind when he designed it.
The reason for the O-360 in my -9 is that it was only $500 more expensive at the time and 20 lbs heavier.
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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02-23-2017, 11:36 AM
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Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,147
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Quote:
Originally Posted by N941WR
Greg & Mark,
You two bring up a good point, the -9 doesn't really need the (I)O-360 to be a good performer. It's beauty is in its ability to cruise efficiently, which is exactly what Van hand in mind when he designed it.
The reason for the O-360 in my -9 is that it was only $500 more expensive at the time and 20 lbs heavier.
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Same here. I like to cruise high and wanted the extra climb performance, it was hard to say no to an additional 20 horsepower at the expense of 20 pounds. I knew I was going to have a constant-speed prop anyway so I chose the lighter carbon fiber Whirlwind prop and got some of those pounds back. I traded a lot of dollars for those pounds, but I got 'em back...
__________________
Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2020 dues paid 
N16GN flying 700 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, 430W
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
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02-23-2017, 11:50 AM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
Originally Posted by airguy
Same here. I like to cruise high and wanted the extra climb performance, it was hard to say no to an additional 20 horsepower at the expense of 20 pounds. I knew I was going to have a constant-speed prop anyway so I chose the lighter carbon fiber Whirlwind prop and got some of those pounds back. I traded a lot of dollars for those pounds, but I got 'em back...
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I was so panicked about the weight when I was building. With the O-290, I was at 990 lbs for my first flight. When I upgraded I stayed with the Catto prop to keep the balance where it should be. Now I'm dreaming of a CS prop and if I can talk my wife out of the cash, it will be a composite CS prop, no question about it!
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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02-23-2017, 12:13 PM
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Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,147
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Quote:
Originally Posted by N941WR
I was so panicked about the weight when I was building. With the O-290, I was at 990 lbs for my first flight. When I upgraded I stayed with the Catto prop to keep the balance where it should be. Now I'm dreaming of a CS prop and if I can talk my wife out of the cash, it will be a composite CS prop, no question about it!
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You've got a pretty good prop now with those cruise numbers, no doubt. I'm guessing you are sacrificing a little bit on the low end for takeoff and climb, though I know Craig makes a fine prop.
__________________
Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2020 dues paid 
N16GN flying 700 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, 430W
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
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02-23-2017, 12:28 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
Originally Posted by airguy
You've got a pretty good prop now with those cruise numbers, no doubt. I'm guessing you are sacrificing a little bit on the low end for takeoff and climb, though I know Craig makes a fine prop.
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You are right, Craig does make a great prop and even though I can see 2000 FPM, when solo, there is nothing like the push you get when taking off in an RV with a CS prop!
I don't do enough formation flying to justify the CS Prop and when I do, I just have to remind lead not to chop the throttle.
The funny thing is what when I'm on someone's wing and they have to land they drop like a rock whereas I just keep gliding and gliding and gliding.
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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02-23-2017, 12:34 PM
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Join Date: Sep 2011
Location: Edgewater, FL. KSFB
Posts: 1,118
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Quote:
Originally Posted by PilotjohnS
Mark,
This is what i was hoping for in selecting the 9: speed the same up high but lower fuel flow. Thanks for the data. This is great stuff.
Need to find what Catto prop you have!
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John,
I don't recall the exact prop but Craig is one of those guys you trust to make the right recommendation. I went with a three blade and nickel leading edges. Still looks new after 350 hours and some trips with heavy rain. My last trip to Texas through a front took one of the Catto stickers off the blade but the leading edges still look great.
I have the Catto, P-Mags and fuel injection and I have had a few people tell me it is the smoothest plane they have been in. (they weren't referring to my flying skills)
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02-23-2017, 03:41 PM
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Join Date: Mar 2014
Location: Laguna Hills, CA
Posts: 1,805
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Quote:
Originally Posted by MarkW
John,
I don't recall the exact prop but Craig is one of those guys you trust to make the right recommendation. I went with a three blade and nickel leading edges. Still looks new after 350 hours and some trips with heavy rain. My last trip to Texas through a front took one of the Catto stickers off the blade but the leading edges still look great.
I have the Catto, P-Mags and fuel injection and I have had a few people tell me it is the smoothest plane they have been in. (they weren't referring to my flying skills)
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Yeah, John, just call Catto, tell them what airframe and engine, and they will nail the prop selection. Mine's a 70x70 two-blade with the YIO-320-D1A, 160 hp, and it pretty much hits all the Van's book numbers.
__________________
Doug
RV-9A "slider"
Flew to Osh in 2017, 2018 & 2019! 
Tail number N427DK
Donation made for 2020
You haven't seen a tree until you've seen its shadow from the sky -- Amelia Earhart
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