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The AirVenture Cup Race from Race #71

Bob Axsom

Well Known Member
We flew up to Mitchell, South Dakota from Arkansas on Friday. The plane was near race ready, which meant our fuel was limited to the standard tanks. I had planned to refuel at Omaha but the low ceilings and visibility caused me to change and land at Topeka. Everything went well but the fuel was over $6 per gallon. When I am going to the AirVenture Cup I do what I have to do to get there and participate. The race staff was there and we got our name tags but we could not actually check in until noon on Saturday.

Friday night we went to a Sport’s Bar named Blarney’s and had dinner with the other racers. It was a pleasant evening spent with friendly like interested people and we enjoyed it a lot.

Saturday we slept in, had breakfast in the hotel then went to the airport to check in and wash the airplane windshield and leading edges. I bought a gallon of water at the gas station adjoining the Ramada Inn and used one of my old T-shirts for the cleaning chores. After we put the cover back on the plane we visited the famous Corn Palace in downtown Mitchell and wrote some post cards to a few friends while waiting for the race briefing at 6:30 PM back at the airport. We really enjoyed our visit to the Corn Palace and the movie they showed there about the Corn Palace and South Dakota. At 6PM we got to the airport and there were just a few people but no racers present. At 6:15 one of the race staff told us that the briefing had been changed back to the Ramada Inn. We got there at 6:30 and didn’t miss a thing. After the briefing we were treated to a tasty buffet dinner. We sat at a table with Bob Vasey (Race #63, RV-3) and his family and we had an enjoyable evening dining and talking with them.

We went to bed at a reasonable time but I didn’t sleep well thinking about race altitude choices, fuel burn strategy, etc. I ate a roll of Tums through the night and morning to calm the digestion process. I called Flight Service and got the winds aloft and used the information to pick the corresponding cells in my matrix for speeds and altitude based on those forecast winds. It results were the same as before I left home; the best altitude seemed to be 9,500 ft. You only have to be burned once from climbing to take advantage of forecast tail winds to be very skeptical – I was so burned in the 2005 AirVenture Cup Race. These conditions were very persistent so I committed to the climb to 9,500 ft. Then, as I slept I wondered if the 500 ft/min rate of climb I had planned in my Excel matrix was less efficient than a faster rate of climb. I slipped out of bed so as not to wake Jeanine and went through the darkness to the bath room and calculated the difference in race speed based on a 1,000 fpm climb and a 500 fpm climb at 100 kts. The speed was faster for the race with the 500 fpm climb on the front end. Back to fitful sleep.

At 6AM the alarm went off, we wrapped up our two-day stay at the Ramada Inn and headed to the airport for breakfast and the 8AM briefing. I wasn’t hungry but my team manager/wife Jeanine brought me two donuts and black coffee. 8AM came and went without a briefing. Word circulated that there was a weather problem in route. The long but appreciative wait began. As lunchtime came there still was no briefing but we had lined up the planes in launch order on the taxiway and ramp. The race staff went to Domino’s and bought pizza’s and soda for everyone. A collection was taken but I have no idea if enough cash was raised to cover the cost. Everyone was mild mannered and they occupied themselves with aviation conversation and doing last little things to their airplanes. I bought a gallon of fuel and topped off our tanks. At about 3PM Eric Whyte announced that the weather had cleared sufficiently on the race course for starting the race. Pilots and crews went to their planes to await the sequential start engine signal. Jeanine and I were buckled in and up to the key turning step in our checklist for a while before the got to us. Our fuel had to be managed carefully and we could not afford to sit there with the engine running. We got the signal, started up and taxied out after a long line of racers and others followed us to the runway.

The first two off were the Nemesis NXT Relentless and a Lancair Legacy. A crowd of spectators had stayed through the hours of waiting and I guess as a show of appreciation the two planes were to circle back after takeoff and do a high-speed flyby to start their race. Naturally others in the fast group wanted the same advantage and voiced that opinion on the radio. It was allowed for all the racers in group 1 which was everything in a class supposedly faster than the RV blue and red classes. That degenerated into many others not wanting to be put in a disadvantage so some racers were going straight off the runway on course and some were circling back for a high-speed run in to the start. I chose the no circle back departure.

We were in line behind Bob Vasey in his RV-3 #63 as he taxied onto the runway. Our SL-60 GPS still hadn’t come up with its position solution and was not providing a usable serial input to the autopilot but my old GPS-90 hand held was working fine. I cycled the power on the SL-60 and it started through its initialization process again. Race #63 started its takeoff roll and it was obvious I was going to be hand flying at least the first part of the race. Bob Vasey rotated off the runway and I pushed the throttle in on our plane to start the takeoff roll.

We crossed the start line at the end of the runway and climbed out on a heading of 085 degrees magnetic. I could see race #63 ahead climbing above us. I held the climb at a relatively steady 500 fpm and stayed in a position behind and below the RV-3. After 15 or 20 minutes I saw the dark red racer descending. It seemed that the pilot had decided this climbing was a waste of time. The data showed that 9,500 ft was the best altitude so I continued the planned climb. As we got higher I noted that the speed in the 500 fpm climb was up to 178 kts so the climb was paying off well with good tail winds aloft.

After we leveled off at 9,500 ft the ground speed (which was all that counted in this situation) slowly increased to the 190 kt range and occasionally exceeded 200 kts. Things were going very well. Then approaching the half way point clouds ahead threatened this high-speed steady state flight condition. Pilots ahead started calling rain and descending ceilings. They sounded sincere but sometimes they can make a bad call. I continued on in a straight line to the finish at 9,500 ft. Then I had to descend because of diminishing visibility there was plenty of clear sky below. As I approached 8,500 ft it cleared up ahead and I could see a clear path to blue sky in the distance. Decision time again do I maintain airspeed and descent to 7,500 ft or climb back to 9,500? I decided to climb. The speed dropped back to the 170’s initially but it came back well even as I climbed. Set up again at 9,500 things were going well but as we approached the Mississippi River it closed in ahead again and I had to descend. Pilots were saying they were descending out of 5,500 ft in this area but once again as I descended to 8,500 ft it cleared up again. Having my previous experience with the beneficial climb the decision was easy this time. We went back up to 9,500 ft and stayed there until about 65 miles from the finish when it looked like we could get shutout by some lower clouds ahead. I had planned to start the descent at 55 miles but 65 was close enough. As it turned out I had to maintain VNE to get down to 200 ft AGL at the Dodge County Airport (UNU) finish line.

Jeanine recorded our start and finish times so we were able to calculate our race speed at 227 mph. Nothing official has been seen yet but I expect all speeds to be very high. We had a great time.
 
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Outstanding! Thanks for the report, Bob. After the fuel consumption posts I'm happy your plan worked out. I can't wait to see the official results.

H
 
Congratulations Bob!

I was 4th place right behind Bob (by less than a minute), and he deserves a lot of credit for running a great race. I think he also must have been the "most improved" racer among the RVs this year, by at least 10 mph relative to the other racers. Quite an impressive achievement and a nice payoff for all his hard work!

In general, higher was faster this year. The Nemesis NXT was considerably slower than expected, and I heard he went very low to try to get under the weather (still managed to get second place however). At the other extreme Lee Behel went to 17,500 in his Legacy to win his class. John Huft went as high as 11,500 and was the fastest RV by a margin of about 16 mph, and Jon Ross (2nd) was also at 11,500. John and Jon both have very fast airplanes to begin with, and Jon designed and built a very nice custom cooling plenum this year that appears to have added some speed.

Weather was definitely a factor, and was highly variable both in time and to the right and left of the course line. Our start was delayed nearly 6 hours due to a storm system in south central MN, which was sliding slowly ESE down I-90. The XM radar was still showing lots of yellow and some red south of Rochester MN when I went by, and some racers (including me) diverted slightly north of course. Even with the diversion I flew through two areas of light rain, one of which caused a temporary 10 knot decrease in groundspeed. I think the other racers who broadcasted reports of weather encounters were generally being honest and not engaging in race tactics.

I started with exactly the same plans as Bob: to climb quickly and take advantage of the winds up high. On the way up I was passed by two camouflage-painted Rockets, both from Canada. I'm glad they weren't armed or there might have been an international incident! I initially leveled at 7500 to check groundspeed and let the engine cool a bit, then went to 9500. My groundspeed at 9500 was 12 knots slower even after allowing the plane to accelerate, so I went back to 7500. In retrospect this was a mistake that cost me time; most likely I just hit a momentary lull in the wind at 9500. I was also concerned about the weather ahead, and for a while was flying under an 8000 broken to overcast layer. There was a bit of turbulence, including one "moderate" knock that pitched the nose up and scrubbed 20 knots of speed. Once past the Rochester area it was smooth sailing to the finish on my line, but just a few miles to the south south I could see lower cloud layers that pushed some racers below 4500.

Overall this was an interesting race because it wasn't just about aircraft speed; it also involved some strategy in dealing with the winds and weather (I don't know if anyone filed IFR but I doubt it). I'd encourage more RVer's to consider racing next year. In particular, the RV-Red class (320 cu. in.) had only two entries and could use more participants.
 
here's some numbers

AirVenture Cup Race Results
Unlimited Type Avg. Speed
Paul Tackabur Lancair IV #T 348.51
Kevin Elredge Nemesis NXT #42 331.41
Pete Zaccignino Lancair IV #128 305.91
Sport
Lee Behel Lancair Legacy #5 334.90
Harry Hinckley SX-300 #30 315.79
Duncan Sutherland SX-300 #74 299.53
Sport FX
Tony Crawford Questair #9 294.91
Larry Mueller/
Steve Hammer Glasair ITD #73 266.80
Tom Martin F-1 Rocket # 109 266.54
RG Blue
Dick Keyt Polen Special #31 313.26
Mark Quinn Lancair 360 #38 260.84
James Redmon Berkut #13 245.50
FX Blue
Bruce Hammer Glasair ITD #91 265.11
Larry Aberg Cozy MkIV #81 233.95
Dave Wilson Glasair IISFT #19 215.79
FX Red
Rich Lamb Long-EZ #93 226.67
Red Hamilton Tailwind #37 226.61
David Biesemeier Sidewinder #86 222.00
RV Blue
John Huft RV-8 #18 249.91
Jon Ross RV-8 #27 233.14
Bob Axsom RV-8A #71 223.89
RV Red
Chris Murphy RV-4 #34 214.06
Bob Vasey RV-3 #63 207.10
Sprint
Klaus Savier VariEze #111 258.51
Gil Hutchison VariEze #79 238.80
 
Well You kind of expect it from Klause Savier ... but

The surprising thing about Race #111's speed is that it is only 4 mpr faster than last year. That tells me he stayed low when the forecast winds favored higher altitude for winds. Is his vari-eze so finely tuned that he has to fly at low altitude or since he only had one competitor did he just decide there was no need to climb? He made an impressive arrival at Michell, South Dakota before the race on Saturday. Very nice!

Here are the RV Blue Class speeds I received from John Huft:

Bob, here are the results in our class

John Huft at 249.91 mph
Jon Ross at 233.14 mph
Bob Axsom at 223.89 mph
Alan Carroll at 222.97 mph
Tom Moore at 217.97
John Mullaney at 216.54 mph
Fred Schryver at 215.97 mph
Jean-Pierre Verdier 212.74 mph

Good racing! That spread sheet must have worked.

John

Bob Axsom
 
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The airplane types are listed here

RV Blue (360)
RV-8 John Huft at 249.91 mph
RV-8 Jon Ross at 233.14 mph
RV-6A Bob Axsom at 223.89 mph
RV-8 Alan Carroll at 222.97 mph
RV-7A Tom Moore at 217.97
RV-7 John Mullaney at 216.54 mph
RV-8 Fred Schryver at 215.97 mph
RV-7A Jean-Pierre Verdier 212.74 mph

RV Red (320)
RV-4 Chris Murphy at 214.06 mph
RV-3 Bob Vasey at 207.10 mph
 
Tom Moore

Is this Tom Moore the same Tom Moore that had a Subaru engine? Does he still have the Subaru or did he change to a 360?

Great write-up Bob - I felt like I was there, butterflies and all!
 
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