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10-02-2009, 02:13 PM
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Join Date: Sep 2009
Location: Atlanta, GA
Posts: 39
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Flying Upside down in a 9
I'm a newbie and have been rading the list for several months. I'm trying to decide between the 7 and 9, so I have a question about the discussion regarding doing loops and rolls in a 9. Can you loop or roll a plane with a carb? From my reading on this list, one of the advantages people list for FI is the ability to fly upside down. Do they mean for extended periods?
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10-02-2009, 02:29 PM
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Join Date: Jan 2007
Location: NC
Posts: 664
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Welcome to VAF Joe!
No offense, but I think you should forget about loops and rolls as they apply to the RV-9. But to answer your question, you can loop and roll a plane with a carburetor. They can be completely positive G maneuvers, meaning the carb will continually deliver fuel. The engine will immediately quit with the onset of negative G, but will immediately restart (assuming brief exposure) when positive G is restored. This is not a problem. Loss of oil pressure if the main problem. Fuel injection doesn't rely on gravity, so it takes care of the fuel delivery...except you also need a flop tube in your fuel tank so that fuel can be retreived from the tank regardless of how the fuel is sloshed about. To take care of the oil pressure problem, you need an inverted oil system. Unless you're interested in competition aerobatics, I wouldn't bother with inverted systems. It's not about upright or inverted, it's about pos/neg G. You can pull negative G's upright and positive G's inverted. Plenty of recreational acro can be done at positive G.
Take some introductory acro instruction and find out if you like it. If so, think RV-7.
Last edited by sandifer : 10-02-2009 at 02:34 PM.
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10-02-2009, 03:49 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
Originally Posted by SlowJoe
... one of the advantages people list for FI is the ability to fly upside down. Do they mean for extended periods?
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Yes, for extended periods of time but you will also need flop tubes in the tanks and an inverted oil system.
Quote:
Originally Posted by sandifer
.... It's not about upright or inverted, it's about pos/neg G. You can pull negative G's upright and positive G's inverted. Plenty of recreational acro can be done at positive G...
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On occasion I would hit a negative bump in my carb'ed -9 and the engine would stumble. The same thing would happen with an over agressive pushover to level flight from climb. Not a big deal but it did it once while giving a member of this forum a ride and is something you should be aware of.
__________________
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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10-02-2009, 03:50 PM
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Join Date: Sep 2006
Location: (2OK2) OK City, OK
Posts: 381
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VS sliced off
[quote=N941WR;364248]What -9 with the VS sliced off?QUOTE]
Does anyone know what the deal was here or if it made it on the NTSB accident listing? Very nice to see the aircraft is flyable with some of the VS and all the rudder missing...but I don't necessarily want be the guy who demonstrates that!
Doug Lomheim
RV-9A, OKC / Mazda 13B/ FWF /Electrical
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10-02-2009, 04:00 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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[quote=dlomheim;364366]
Quote:
Originally Posted by N941WR
What -9 with the VS sliced off?QUOTE]
Does anyone know what the deal was here or if it made it on the NTSB accident listing? Very nice to see the aircraft is flyable with some of the VS and all the rudder missing...but I don't necessarily want be the guy who demonstrates that!
Doug Lomheim
RV-9A, OKC / Mazda 13B/ FWF /Electrical
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Doug,
Take a look at the "PU" number, it will not hit the FAA/NTSB database as it doesn't look like it happened in the states.
PS. "PU" is for aircraft registered in Brazil.
__________________
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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10-03-2009, 10:25 AM
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Join Date: Sep 2009
Location: Alfenas, Minas Gerais - Brazil
Posts: 15
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PU 09A
Hi guys,
that?s right. PU is the brazilian registration for ultralights. The nine is the only RV (no RV 12?s here yet) that may be registered like that down here. It?s something like the LSA, but it does not have a max speed limit, only weight and stall. On the other hand, It doesn?t matter how well equiped or constructed your plane is, experimental cannot be IFR, and VFR is limited to FL075 
I will try to get some more information about the VS incident in the local news and keep you up to date.
Cheers
__________________
Rv 09A wings and empennage kits ordered.
Researching Tools/Cleaning Hangar.
Almost too anxious to wait.
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10-03-2009, 06:36 PM
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Join Date: Apr 2009
Location: Ipswich QLD Australia
Posts: 245
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What's the MTOW Dito?
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10-04-2009, 04:08 PM
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Join Date: Sep 2009
Location: Alfenas, Minas Gerais - Brazil
Posts: 15
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MTOW
Hi Racer,
The limits are: MTOW 750kg (aprox 640 lb); Stall speed < 45Kts; single explosion engine; 2 seats.
Regards,
__________________
Rv 09A wings and empennage kits ordered.
Researching Tools/Cleaning Hangar.
Almost too anxious to wait.
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10-04-2009, 04:22 PM
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Join Date: Feb 2007
Location: San Diego, CA
Posts: 1,670
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Quote:
Originally Posted by DitoLiberato
Hi Racer,
The limits are: MTOW 750kg (aprox 640 lb); Stall speed < 45Kts; single explosion engine; 2 seats.
Regards,
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750kg is approx. 1650 lbs.
__________________
Pete Hunt, [San Diego] VAF #1069
RV-6, RV-6A, T-6G
ATP, CFII, A&P
2020 Donation+, Gladly Sent
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10-04-2009, 08:51 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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MTOW for an RV-9/9A is 1750 lbs (794 Kg).
That weight can be lower for -9's with smaller engines but with my O-290 I set it at 1750 and don't really see a reason why the the GW should be reduced based on the performance I saw.
__________________
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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