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11-22-2011, 12:50 PM
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Join Date: Aug 2007
Location: Wichita Falls, TX
Posts: 2,182
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A fellow at my airport once bought an RV-4 with a 200+hp angle valve IO-360, and Hartzel CS prop. It had extra high compression pistons (10 or 11 : 1)and was probably well north of the original 200hp. On his way home from the west coast to bring the plane home after purchase, he had a hot start incident when the engine suddenly roared to life on startup and despite the stick all the way back, it nosed over and suffered a propstrike. After teardown/rebuild, he had a much lighter MT composite 3-blade CS prop installed instead, which helped the noseheaviness considerably. That plane was ridiculously overpowered and a handful to fly and land, so he sold it after keeping it only a couple years.
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Neal Howard
Airplaneless once again...
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11-22-2011, 01:15 PM
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Join Date: Oct 2005
Location: Vancouver, WA USA
Posts: 908
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Quote:
Originally Posted by Neal@F14
A fellow at my airport once bought an RV-4 with a 200+hp angle valve IO-360, and Hartzel CS prop. It had extra high compression pistons (10 or 11 : 1)and was probably well north of the original 200hp. On his way home from the west coast to bring the plane home after purchase, he had a hot start incident when the engine suddenly roared to life on startup and despite the stick all the way back, it nosed over and suffered a propstrike. After teardown/rebuild, he had a much lighter MT composite 3-blade CS prop installed instead, which helped the noseheaviness considerably. That plane was ridiculously overpowered and a handful to fly and land, so he sold it after keeping it only a couple years.
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Interesting, I wonder what the problem was, mine is a joy to fly, very easy, no bad habits, just like any RV-4 but with more power. If this plane was over powered what does this say for an HR2?
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11-22-2011, 07:32 PM
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Join Date: Jun 2010
Location: Horsham, Victoria, Australia
Posts: 83
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Ok, thanks for the help guys. This is a project that I am keen to persue. I will be going with a Catto fixed pitch cruise prop. So, if as Rob has stated I have a battery central in the console area, and a light weight starter. Can the group give me a list of weight saving mods for the angle valve 200hp that will trim this beast down even more ?.
The fat controller with the stick in his hand could shed a few Kilo's - that would be a good (but unlikeley) start but apart from that what would help this bird excell at yank and bank ?.
Paul
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Rv 7A
Rv 6
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11-22-2011, 08:20 PM
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Join Date: Oct 2005
Location: Vancouver, WA USA
Posts: 908
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List already posted
As copied from my first post #8. YMMV
""IO-360 A1A, Sky Dynamics cold air intake, Sky Dynamics magnesium oil sump, light weight starter, Odyssey 680 battery and MTV 15 B composite CS prop"" http://www.skydynamics.com/frame.htm
Last edited by Russ McCutcheon : 11-22-2011 at 08:23 PM.
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11-22-2011, 10:02 PM
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Join Date: Jun 2010
Location: Horsham, Victoria, Australia
Posts: 83
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Done, but fixed pitch which should be even lighter again
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Rv 7A
Rv 6
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11-22-2011, 11:02 PM
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Join Date: Oct 2005
Location: Vancouver, WA USA
Posts: 908
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good deal, should be fun!
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11-23-2011, 01:11 AM
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Join Date: Jun 2010
Location: Horsham, Victoria, Australia
Posts: 83
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Thanks Russ, what about electronic ignition ? will this help also, if so which unit is best for this engine.
Really enjoy this group, hope to meet some of you someday - Oskosh presumably.
Paul
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Rv 7A
Rv 6
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11-23-2011, 02:25 AM
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Join Date: Mar 2005
Location: SE Florida
Posts: 1,499
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Check your private messages. You must be "signed in" to view them.
Charlie
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11-23-2011, 09:06 AM
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Join Date: Aug 2007
Location: Wichita Falls, TX
Posts: 2,182
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Quote:
Originally Posted by Russ McCutcheon
Interesting, I wonder what the problem was, mine is a joy to fly, very easy, no bad habits, just like any RV-4 but with more power. If this plane was over powered what does this say for an HR2?
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The HR2 has a lot of thought and engineering put into the RV-4 mods in order to take on the big engine, changed weight distributions, and high speed operations.
My friend's plane was just a standard RV-4 with a big honkin' heavy engine simply bolted onto the nose without much other consideration. It was basically an overweight, noseheavy "How quickly to you want to hit Vne?" machine that, while beautiful to look at, lacked certain grace, was a bit ill-mannered on landings if you tried to 3-point it, and roasted cylinders and exhaust valves pretty regularly.
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Neal Howard
Airplaneless once again...
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11-23-2011, 10:03 AM
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Join Date: Oct 2005
Location: Vancouver, WA USA
Posts: 908
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Quote:
Originally Posted by Paul Walter
Thanks Russ, what about electronic ignition ? will this help also, if so which unit is best for this engine.
Really enjoy this group, hope to meet some of you someday - Oskosh presumably.
Paul
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I have my eye on a set of P-mags however my plane was built with Slick mags and I?m still currently running Slicks, they require some maintenance but have not been too problematic.
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