VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics


Go Back   VAF Forums > Model Specific > RV-9/9A
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
  #21  
Old 06-29-2009, 06:14 PM
L.Adamson's Avatar
L.Adamson L.Adamson is offline
 
Join Date: Apr 2005
Location: KSLC
Posts: 4,021
Default

Quote:
Originally Posted by N941WR View Post
I suspect but don't know, if you took those two airplanes up where you need O2, the -9 might be slightly faster due to its more efficient wing. (That comment should open a can of worms.)
Don't count on it........

Turns out that my 1172 lb. RV6A is a speed demon! Why.............I don't know!

L.Adamson --- RV6A (flying)
Reply With Quote
  #22  
Old 06-30-2009, 01:49 AM
Finley Atherton Finley Atherton is offline
 
Join Date: Nov 2005
Location: AUSTRALIA
Posts: 749
Default

Quote:
Originally Posted by GETST8FRM View Post
Mike, my 9A performs better than all of the Van's published numbers by a couple MPH. I can't get 1900 fpm climb except for the first 2000 ft. I have an 0-320 (160 HP) and a fixed pitch . Several other RVer's have told me that my 9A is exceptionally fast. I do like to spin my prop....I rarely spin it under 2450 rpm. Also, I can't get it to burn over 8.2 gal. at any altitude. At 10,000 my TAS is bumping 200 mph at 6.8 gph. If I can only get my autopilot to act right. LOVE MY 9A!!!!!!!!
Quote:
Originally Posted by scard View Post
Wow, I'm impressed. Did you build it? If that were my airplane, I'd be checking my instrumentation and numbers.
Your figures look good and I can understand why you love your 9A. Not many aircraft have both a slow stall speed and a decent cruise speed. I see you purchased your 9A. If you want to test the accuracy of your TAS speeds and compare your performance to other 9As, can I suggest you fly at 8,500 ft density altitude and use the 4 leg Excel spreadsheet to calculate you TAS. http://www.ntps.edu/HTML/Downloads/ Click on GPS PEC Spreadsheet and select 4 leg at the bottom.
As a point of reference my 9A does about 170 kts (195/196 mph) at 8,500 ft density altitude WOT and 2,700 rpm.

Fin
9A. 0-320, Hartzell C/S prop, EI and mag, 9:1 comp ratio.
Reply With Quote
  #23  
Old 06-30-2009, 05:53 AM
videobobk's Avatar
videobobk videobobk is offline
 
Join Date: Jan 2005
Location: Near Scipio, in Southern Indiana
Posts: 1,779
Default

My 9A has a 160, Catto three blade and E-mag/P-mag combo. The only "speed mod" not almost universal is a nose gear fairing. It came in at 1054 lb empty. Solo with half fuel numbers on a standard day (if there is such a thing!) beat Van's by a bit:

8,000 WOT 192 mph @ 6.9gph. Sorry, didn't record rpm.
1800 fpm measured 3-4000'.
Normal cruise at 4-6000' 150-160 @ 4.5-5.0
Normal ROC 12-1500 fpm @ 105-115 mph
It IS faster up high, but I don't have firm numbers. I wouldn't dispute "bumping 200" on an EI 9A but have never done a three way run to get it accurately.

Bob Kelly
__________________
Bob Kelly, Scipio, Indiana
Tech Counselor
Founder, Eagle's Nest Projects
President, AviationNation, Inc
RV-9A N908BL, Flying
Reply With Quote
  #24  
Old 06-30-2009, 08:30 AM
N941WR's Avatar
N941WR N941WR is offline
 
Join Date: Jan 2005
Location: SC
Posts: 12,887
Default

Quote:
Originally Posted by L.Adamson View Post
My 6A ( Lyc 180 C/S prop) is about 20 mph faster than the 9A (160HP C/S prop) that I regularly fly with. The 9A can land 10 mph slower though.

L.Adamson
And a V-8 Mustang can out run a V-6 Mustang.
__________________
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
Reply With Quote
  #25  
Old 06-30-2009, 10:01 AM
Steve Steve is offline
 
Join Date: Jan 2005
Location: Roy, Utah
Posts: 1,144
Default

I have a 160 HP ECI Titan up front with the recommended Sensenich prop. I live in Utah so the average cruise altitude is 7500 or 8500 depending on direction (sometimes higher, sometimes lower depending on distance and terrain). Average a/c configuration is solo/full fuel/10 lbs of stuff in back.
After WOT and full rich climb, I pull back to cruise at 22" MP and 2400 rpm and leaned to approx 1300 deg F.
The average GPS 2-way ground speed is 150 kt. (IAS hovers around 140 kt / 155 mph). TAS calculates out to be right around Vans 186 mph. Fuel burn has never exceeded 8 gph.
I use 150 kt and 8 gph as flight planning constants and usually arrive within minutes of the estimate and with fuel to spare.
__________________
Five Sierra Fox
RV-9A
Utah
Reply With Quote
  #26  
Old 06-30-2009, 11:12 AM
mkmuch's Avatar
mkmuch mkmuch is offline
 
Join Date: Dec 2008
Location: Muscatine, IA
Posts: 98
Default thx Steve

Your description is exactly what I was looking for... Done some more recommended search and the performance numbers are narrowing...

Still searching for more info than what I've found on the next question...

What are the performance gains of a 180 or 200hp in the rv-9? feel free to add that to the response for those of you with that installed base.
__________________
Mike Much
Muscatine, IA
Wanting to Build an RV-8 (sitting on the fence)
Reply With Quote
  #27  
Old 06-30-2009, 11:31 AM
339A's Avatar
339A 339A is offline
 
Join Date: Jan 2005
Location: Littleton, CO
Posts: 367
Default Two recent tests

I recently did a couple of TAS tests with my 9A. I needed to send my Catto prop back to Craig for a refinish and I wanted to have some pitch added. The Catto is a 66 x 70, the three way GPS run was done at 9100 PA. The TAS came out at 185 MPH. I didn't get the temp or dew point At this altitude I was WOT and cranking at 2720 RPM

I then put my old Sterba prop back on. Next week same conditons 9100 PA. The Sterba is a 68 x 76 and the TAS came out at 179 MPH. RPM was around 2550 WOT. This is the same as the original flight tests with this prop.

I assume the DA was conservatively 10,000. Should have got the temps I know, but I forgot.

My 9A has an H2AD 160 HP with the Dual Mag pack.
__________________
Scott Mills, Front Range, CO
N339A - 1900 Hours!! since 9/11/05
Like Us on Facebook: https://www.facebook.com/ScottandDeb...tures/timeline
Airport Landings

"In order to discover new lands one must have the courage to lose sight of the shore." Andre Gide

"Never feel sorry for a man who owns a plane" Charles Morse (Anthony Hopkins) in The Edge
Reply With Quote
  #28  
Old 06-30-2009, 12:21 PM
N941WR's Avatar
N941WR N941WR is offline
 
Join Date: Jan 2005
Location: SC
Posts: 12,887
Default

Quote:
Originally Posted by mkmuch View Post
...What are the performance gains of a 180 or 200hp in the rv-9? feel free to add that to the response for those of you with that installed base.
Oh no! Please say you didn't ask about putting a larger than recommended engine on your RV-9. You had better duck!

Seriously, the -9 was designed for the O-320 160 HP as the max. A number of people have installed 180 HP O-360's and one guy had his engine dynoned at well over 200 HP. Typically airplanes gain a good bit in ROC but little in TAS when larger engines are installed. The down side is the decrease in useful load.

People have done it but it is not recommended. Continue searching Grasshopper and you will find the answers. They are there, hidden among the trees.
__________________
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
Reply With Quote
  #29  
Old 06-30-2009, 08:01 PM
mkmuch's Avatar
mkmuch mkmuch is offline
 
Join Date: Dec 2008
Location: Muscatine, IA
Posts: 98
Default hahahaha!

Never dream of going out of spec to what VANS says... I do not have that kind of engineering degree... Was just curious because I know several people have - so was curious what they found with that wing (being unique).
__________________
Mike Much
Muscatine, IA
Wanting to Build an RV-8 (sitting on the fence)
Reply With Quote
  #30  
Old 06-30-2009, 10:09 PM
bryanflood's Avatar
bryanflood bryanflood is offline
 
Join Date: Aug 2006
Posts: 114
Default RV-9A

Here is some older speed data I dug up, which represents different configurations all within the same data set, so it's not good for much more than an average. The constants are RV-9A, O-320, Sterba 68x78. I flight plan cruise at 130 knots at 55% power 6.5 GPH.

Bryan



http://img33.imageshack.us/img33/1142/speedliy.jpg
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 04:24 AM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.