Free Flight

A good day to file IFR.

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When I flew from Houston to Minneapolis one late-winter Sunday, into the teeth of 30-knot headwinds, I figured Id have a nice ride home on Tuesday. But no good deed goes unpunished. The high-pressure area generating the northerly flow on the way up had shifted just far enough east to provide southerly flow and 30-knot headwinds for the return as well. Fortunately, the winds decreased with altitude (odd in the winter), so the higher I went, the less the effect would be. The forecast for weather was good-clear (and cold) skies down into southern Missouri, with broken to scattered clouds the rest of the way. I picked Neosho (EOS) as a refueling spot, slightly more than halfway home, a place I have landed before, with reasonable fuel prices. If I hit more headwinds, I had plenty of options in northern and central Missouri as well.

I was glad that Id left the Valkyrie-my RV-8-in a heated hangar for two nights, as it was ready to go for a morning departure, despite the cold temperatures. I launched off Anoka County Airport as the clock ticked over 0800, and scooted around the east side of the Class B airspace, looking at old haunts and how the city had grown since I lived there in my youth. Sure enough, the southerly flow was there, with 35 knots of headwind down low. As soon as I cleared the Class B, I climbed to 10,500 feet, and was rewarded with virtually calm winds and temperatures that werent so bad as on the trip up. The sun coming in to the big Plexiglas bubble warmed my upper body as the standard one-hole heater kept my toes warm. Nevertheless, the thermal underwear under my flight suit was welcome!

So much for the forecast of scattered-to-broken clouds. When reality is overcast with holes, you have to be prepared to be flexible.

The NEXRAD showed an interesting line of precipitation running east-west across the middle of Missouri-actually, all the way from Wichita in the west to east of St. Louis. Mostly green, it also had some yellow and a little orange embedded along my route. Squinting into the distance, I could see some high cloudiness, and wondered what this disturbance was all about. I hit the animate button on the Garmin 696, and saw that the line of precip was sliding east and dissipating in the west, so I decided that if it was still there in the hour it would take me to get to its location, I could deviate into Kansas if needed.

I am always worried about icing in any precipitation in the winter, so I kept an eye on the outside-air temp (OAT), which seemed to be rising. As it turned out, no deviation was required, though I did dip down a thousand feet to duck under some high cloud remnants. It was clearly dark and still precipitating to the east as I passed through western Missouri. It was time to begin a descent into EOS anyway, so I dialed in a good rate, and followed the new Flight Director software that I had installed before the trip to give it some more test time. It gave a nice, steady descent rate, something that I always have to do by eye and experience. The FD gave me a precise pitch angle to aim for, and that worked out well.

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Reconciliation

It became clear on the way down to EOS that the forecast of scattered to broken layers down low was overly optimistic. Overcast with holes was more what I was seeing, with solid overcast to the south, topping out about 6000 feet. I had no trouble making a visual descent into EOS for fuel, but with the ceiling at about 2500 feet AGL there and to the south, I took a closer look at what was happening at reporting stations along the rest of the route.

Pretty much everywhere I was seeing the overcast about 2500, with some stations reporting breaks. The problem in that part of the world (western Arkansas) is that there are numerous hills and ridges, some quite high. When all of the reporting stations (down in the valleys) report overcast at 2500, that means that the ridges are oftentimes shrouded in low-visibility clouds. I played VFR-Dodge-Mountain south of Fort Smith many years ago and say No thanks! to that option now-it is nerve-wracking enough to follow a highway at low altitudes through hills in a slow airplane-doing it at RV speeds is just not fun!

So while I was waiting for the fuel tanker to fill up the self-serve tanks (bad timing on my arrival-they had just started), I logged in to the Weathermeister web site, checked the detailed forecasts, and filed IFR to home. I was just past the southern edge of the icing AIRMET from the system that was north and east of me, so I was comfortable with the climb through the clouds in the area. Light green precip was showing up along the early part of the route, but it looked like the kind that never reaches the ground, and temperatures had been several degrees above freezing at the altitudes of the tops.

Fearless Flying

This is the kind of IFR I like-good ceilings (and visibility) at both the departure and arrival ends, a chance to cruise above the tops knowing that you are in the system and have bailout options below, with equipment that gives you the option to quickly aim for an alternate and shoot an approach with clear guidance (to someplace you have never been) in case of emergency. The clouds at the Houston end were showing broken, with bases around 3000 feet, so I figured that I wouldn’t even have to shoot an approach when I got there. I lifted off from EOS with full tanks, dialed in the Center frequency and checked in, looking for my IFR clearance to Houston (with VFR visibility and plenty of cloud and ground clearance if I needed to wait). The controller came back immediately with an IFR squawk and my clearance as filed, and I pushed on up through the deck of clouds to see clear and sunny on top to the south.

I had filed airways because I so rarely use flight-plan waypoints anymore, and the deviation from a straight line was pretty trivial in this case. Airways also took me over slightly less rugged terrain, and that is always a plus. It was interesting, then, when Center came back and offered Direct T78 if I wanted it-and I turned him down because I wanted to watch my EFIS/autopilot make the turns without any overshoot at the en route VORs. I am sure the controller was puzzled.

A couple of hours cruising at 11,000, and I was ready for a descent through the large holes in the broken layer at my destination (T78, Liberty Texas, with cheap fuel on the east side of town. Its always good to top off before ending up at our home airpark, as we don’t have fuel there). The winds were gusting out of the south, giving my feet a good workout on landing, but I was back in the warm weather, and couldn’t wait to get home and peel off the thermals.

This is how I like to use the IFR capability of the RV-known good weather at both ends, XM weather in the cockpit to monitor conditions in real time and lots of extra fuel (in this case, 2:15 of reserves) to detour if required. The capability to shoot low approaches with advanced EFIS representations (HITS [highway in the sky] and Flight Directors) and redundant nav systems is something I save as a level of margin-I don’t go into a flight planning to use it. And weighing a VFR scud run in hills and valleys against a boring high cruise above the clouds with the knowledge that if the clouds don’t clear at the destination, you are already set up for an approach? Priceless!


Paul Dye is an aeronautical engineer, commercial pilot and avid homebuilder with 30 years of leadership experience in aerospace operations and flight testing. He is also an EAA tech counselor and flight advisor who currently flies an RV-8, which he built, and is working on an RV-3.

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Paul Dye
Paul Dye, KITPLANES® Editor at Large, retired as a Lead Flight Director for NASA’s Human Space Flight program, with 40 years of aerospace experience on everything from Cubs to the Space Shuttle. An avid homebuilder, he began flying and working on airplanes as a teen, and has experience with a wide range of construction techniques and materials. He flies an RV-8 that he built, an RV-3 that he built with his pilot wife, as well as a Dream Tundra they completed. Currently, they are building a Xenos motorglider. A commercially licensed pilot, he has logged over 5000 hours in many different types of aircraft and is an A&P, EAA Tech Counselor and Flight Advisor, as well as a member of the Homebuilder’s Council. He consults and collaborates in aerospace operations and flight-testing projects across the country.

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