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02-20-2009, 11:56 AM
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Join Date: Jan 2005
Posts: 74
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O360 + fixed pitch + RV-9A
Is anyone flying behind a (i)O360 fixed pitch RV9(A)
If so what info can you give about Vne
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Peter Laurence
RV9A Fuse
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02-20-2009, 12:46 PM
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Join Date: Jan 2005
Location: Coshocton, Ohio
Posts: 315
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The Vne is a factor of the airframe, and is fixed.
However, how much faster than Vne you can go is related to engine size 
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Dave Durakovich
CFIG, AGI, COMM SEL, VAF# 133
RV-4, N666PR, Finished (Well, at least flying)!
RV-6 - Adopted an orphan!
Detroit, MI
"If you think you can do a thing or think you can't do a thing, you're right."
Henry Ford
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02-20-2009, 01:28 PM
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Join Date: Jan 2005
Posts: 74
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Quote:
Originally Posted by ddurakovich
The Vne is a factor of the airframe, and is fixed.
However, how much faster than Vne you can go is related to engine size |
Dave ,
Thanks for the reply.
I'll be more specific:
I aware of V-N envelopes and I have one for the RV9
I would like to know if anyone in the RV community has placed a 180HP engine in his/her 9 or 9A with a sensenich fixed prop.
If so, what are you cruise true speed numbers up to 75% power at 8000 ft.
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Peter Laurence
RV9A Fuse
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02-20-2009, 01:34 PM
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Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,122
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I know several people have put an (I)O-360 with a CS prop in a 9 or 9A, but I don't recall seeing one with a FP prop. You are paying a pretty decent effeciency penalty with a FP prop across the wide speed range of the RV family. You can optimize the FP for high speed cruise, but the CS will get you the best of both worlds, at the detriment of your wallet.
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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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02-20-2009, 05:43 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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NO! Not another FP vs CS thread!
We have beat that horse into the ground. I'm guessing we must enjoy it.
I suspect the poster would like to know if a 180 HP RV-9 can bump up against the VNE.
Any answers out there? I know I can't get close with all of my 135 horses.
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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
Last edited by N941WR : 02-22-2009 at 08:36 AM.
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02-20-2009, 06:08 PM
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fugio ergo sum
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Join Date: Apr 2006
Location: Carlsbad, NM
Posts: 1,912
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Dave, db1yg is on these forums and flies an RV-9A with a Catto fixed pitch and IO-360. He has posted some about the combination and seems very happy with it.
I expect he will show up and tell you what he thinks.
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Larry Pardue
Carlsbad, NM
RV-6 N441LP Flying
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02-20-2009, 06:42 PM
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Join Date: Mar 2006
Location: Tucson, AZ
Posts: 823
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RV9A with an O-360, f/p Sensenich 83" cruise prop.
Yes, I fly an RV9A with an O-360, f/p Sensenich 83" cruise prop. Today we flew from KTUS to KFUL (375 miles) @ 8500, 60-64% power, 2480 rpm, 144 kts true, 7.2 gal per hour. I run at PK or just into LOP according to the Dynon 180.
The O-360 we built has 7.2 compression pistons and I burn ethanol free auto gas. Superior said this combo delivers 168-172 hp.
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Barry - Tucson
RV9A Superior O-360 (an amazing experience)
Dynon AP Garmin Sensenich F/P
2020 Dues paid. Thank u DR!
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02-20-2009, 07:00 PM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,027
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Quote:
Originally Posted by plaurence
Dave ,
Thanks for the reply.
I'll be more specific:
I aware of V-N envelopes and I have one for the RV9
I would like to know if anyone in the RV community has placed a 180HP engine in his/her 9 or 9A with a sensenich fixed prop.
If so, what are you cruise true speed numbers up to 75% power at 8000 ft.
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The recommended 160 HP limit for an RV-9 isn't because of the airplanes VNE.
It is because of the VNO speed (max structural cruise, which is the start of the yellow arc range).
For safety, an RV should not be flying/cruising at an IAS within the yellow arc range. With more than 160 HP this is quite easy to do.
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Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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02-20-2009, 08:20 PM
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Join Date: Mar 2008
Location: Reno NV
Posts: 542
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O-360+FP+RV-9A
I have one, N65XX, at 4SD. O-360-A4M with 8.5 pistons and std mags mated to a Sensenich 72 x 83 prop. At 8000', 2450 RPM, 9 gal/hr, D180 says 63% ROP indicates 155 Kts. Is this the info you wanted or the other posts. Dan.
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02-21-2009, 07:21 PM
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Join Date: Jan 2005
Posts: 74
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Thanks to all that replied. It's been very helpful.
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Peter Laurence
RV9A Fuse
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