Spring 2006 · · PAGE 209.
April 18, 2006: I was having a good day today, phone calls, business activities, post office, bank, etc. Then I called the airport to see about the price of AVGAS. The tanker truck was on the way, and the price goes WAY UP later this week. I also checked in with a co-worker to discover why I did not see any emails from him yesterday -- it was a company holiday. (The new guy is always the last to know.) I really have to program all those dates into my calendar in Outlook.
I had things under control with my various job assignments for today, so I
finished my important calls while enroute to the hangar to get the "Enterprise"
out for a quick trip to the Collegedale Airport to fill the fuel tanks with 100LL before
the price increase later this week. After putting in 29.6 gallons, I was on my way
back to Wendell's field to clean up the airplane. Here is a quick photo on the ramp
before I put N2PZ back in the hangar. Wendell's Aeronca Champ normally sits up front
by the hangar door, so I get to move it every time I go flying. The Hobbs meter
added another 0.5 hours. And yes, I had two additional business phone calls when I
was in the hangar cleaning the bugs off the airplane. I also mailed my
aviation insurance premium today for the coming year. April 27,2005 was the day I moved the airplane out of the
garage and to the airport, and the day my aviation insurance took effect. This
year, the premium is lower due to my 171.7 hours of flying N2PZ in the past year.
Speaking of Wendell, I went over to his place Monday evening to get his first flight instruments on order. I helped him pick out the correct part numbers for the items he wanted from Van's Aircraft. The list included a true-airspeed indicator (MPH/KNOTS), altimeter (inches), vertical speed indicator, whisky compass, two analog fuel gauges, and the resistive fuel float sensors. We also reviewed the list of engine features he wants and the engine montioring system I have and the part numbers for the options he wants for that.
And a bit of aviation history deserves mention today: April 18, 1942 was the day of the Doolittle Raid on Tokyo in World War II.
One more thing, that large profile blue print of my airplane is still stapled to the wall of my garage (see PAGE 118). I thought I was going to take it down right after I moved the airplane from my garage to the airport for final assembly. Somehow, I just felt it should stay up there (until I move someday).
April 19, 2006: I took
some time this evening to dump the GPS track from yesterday's short flight into my map
program. The ground track from my place to the air field is also in there, including
a stop at Walmart for a few things. I think it is obvious that the BLUE track is the
flight, and the green tracks are on the ground in my car.
I also had a short visit with Wendell tonight to give him some instructions on work he can be doing while we wait for the next shipment from Van's. He talked with Penn Yan Aero about an engine today. The current delivery schedule is only 4-weeks after receipt of order. My delivery was in the 16-week time frame during the summer of 2004. He will be ordering the firewall forward kit so he can get to work on the throttle quadrant, cabin heat door, etc. That kit also includes the master solenoid to let us start wiring and testing things as we get them installed. The immediate job is to start working with paper instruments to work out the desired instrument panel layout.
April 23, 2006: My usual
Sunday posting is again about the work on Wendell's RV-8 on his page 17. Things are going well and the details are
in his section of the web site. My airplane sits quietly in the corner of the hangar
until needed again for flying Young Eagles and the EAA 709 Spring Fly-in coming up May
12-14 at the Rome, Georgia airport. The big day is Saturday, May 13th. The
P-38 "Glacier Girl" will be there as part of the festivities. The day
begins with a pancake breakfast early Saturday morning. Camping is available on the
field. Ya'll come now!
April 29, 2006: Here is a Saturday morning post to advise you of my upcoming flight planning and Wendell's project. My day job requires that I be in Denver during the week of June 19-23 for a trade show. That trip is one where the RV-9A can fly there and back and save time and money over the airlines. The time saving is not having to go to the airport for security check-in and the long drive to Nashville or Atlanta. The avgas I will use will be less costly than the airline tickets. I called the Denver Front Range Airport FBO yesteday to learn that the tie-down fees are only five dollars per night. The good news is the Rocky Mountain Fly-in is the next two days after my trade show ends. Since my airplane will be there, and the trade show ends at 1 PM on Friday the 23rd, I get to stay over for the big day of the fly-in on Saturday, then head home on Sunday. It should be a good weekend in Denver!
As for Wendell's project, it is coming along nicely with a couple of milestones in the mounting of the empennage components to the fuselage. The details are on his PAGE 18.
May 4, 2006: It has been a rainy week with two nights of NOT working with Wendell on his RV-8 project. I did help him for a few hours this evening to get the elevator trim cable and the elevator pushrods installed. Two photos of that work are shown on his page 18 at THIS LINK.
I also took a few minutes to consider an alternate route to Denver for my June business trip and discovered a relatively new airport in Missouri that may serve as a fuel stop enroute westbound.
May 7, 2006: My usual Sunday morning update finds Wendell with new updates on his PAGE 18 after a session on Saturday afternoon and evening. I am also answering an email this morning to another builder who is asking about fixed-pitch and constant-speed propellers. I had posted some comments on this subject on the Van's Air Force forums. http://www.vansairforce.com/community/showthread.php?t=7430 You will see my post on page two of that forum posting with my signature "n2prise" at the bottom of my entry. I have reviewed some pages on my web site to find photos showing the performance of a constant speed propeller. I also provided some observations I made when I went to a fly-in and saw two RV-6's takeoff and climb out from the airport. The details are in the text from my email reply posted below for all of you to see.
|When I was building my RV-9A I went to a fly-in (in my car) at
the Moontown Airport (3M5) and watched a pair of RV-6's depart. The first one was
equipped with a constant speed propeller, the second with a fixed pitch prop. The
first guy took off and the engine came up to 2650 RPM almost immediately. It was off
in a hurry and climbed like crazy. You could hear the pilot pulling the power back
in the climb after about 300 feet AGL, then again at pattern altitude to cruise
settings. To sum it up, 2650 takeoff, 2500 RPM/25 inches manifold pressure for
initial climb, 2400/24 to finish the climb to pattern altitude, then 2300/23 cruise.
When you climb above 8000 MSL, the manifold pressure will drop as you climb. Look at
the last photo at the bottom of my page 160 http://www.n2prise.org/rv9a160.htm and
you will see the Dynon D-10A is indicating a true airspeed of 143 knots (small text
on the screen, right side) and the GPS is showing 157 MPH. If you do the math of 143
knots x 1.15 = 164.45 MPH true airspeed. My headwind component was about 7
MPH. The engine monitor is showing 2320 RPM at 18.9 inches of manifold pressure at
12,500 MSL. The fuel flow is 5.6 gallons per hour. Dividing true airspeed of
164 by 5.6 gallons, gives over 29 MPG!
Now, about the fixed pitch airplane taking off from Moontown, engine RPM came up slowly, but not 2650 on takeoff. The engine RPM will not reach maximum until it gets to cruise altitude and level flight, just like in the 150/152/172. As for an example, on July 5, 2005, I flew with a Cessna 172 down to another airport in Georgia about 45 miles from Chattanooga. He was running full throttle at 172 speeds of 125 MPH. I was way back on the power, burning about 4 gallons per hour, and my airplane felt sluggish. Air-to-air photos are on this web page: http://www.n2prise.org/rv9a143.htm.
Landing an RV with a fixed pitch prop requires a low idle speed or it will float down the runway, especially an RV-9/9A since the wing is so efficient (low drag). That is one reason I fly above 10,000 MSL on any long cross country trip. The wing is really efficient up there and the fuel burn with proper leaning is also saving money. Look at that photo on page 160 again and notice the numbers and the 4-line graph on the engine monitor top row. I have leaned the mixture to get the bar graphs of the exhaust gas temperatures (EGT) as close together as possible without the engine running rough. The highest EGT is shown at 1354 degrees F. The probe is mounted in the exhaust header pipe three inches from the cylinder head exhaust flange. The other temperature of 374 degrees F is the hottest cylinder head. Running the engine too rich raises the EGT since unburned fuel is being burned in the header pipe, not the cylinder where it produces more power. The other thing indicated by the nearly equal lines on the horizontal graph is the nearly even distribution of fuel to all four cylinders, meaning more power from the engine. My airplane has a carburetor, not fuel injection, which makes it easier to start when the engine is hot. Carbureted engines cost less than fuel-injected engines.
As for the constant-speed prop becoming an air brake, I had my first experience with that phenomenon before my airplane took flight. David Edgemon came over to Chattanooga from Huntsville, Alabama to give me that ride. http://www.n2prise.org/rv9a42de.htm When he pulled the power back to slow down, the oil pressure went down and the prop went "flat" to the high RPM position. With no engine power to drive it, the prop became an air brake and I could feel my body pushing the shoulder straps for sure! That is how you get into short landing strips, low gear and flying the numbers on approach!
I hope this adds something to your thinking about future performance and operating efficiency of your airplane. Look at this page and you will see an RV-9A built by another Moontown Airport pilot with a wood prop (obviously fixed pitch). He sold this airplane and built several more quick-build kits over a span of a couple of years. http://www.n2prise.org/HNTJan10.htm I last saw him flying an RV-7A with a constant speed prop.
I hope this email posting helps some of you builders out there with that decision about how to equip your airplane for the long-haul performance and resale value. The constant speed propeller is what gives RV's their full potential with whatever engine is mounted up front!
May 14, 2006: I flew down to
Rome, GA (KRMG) yesterday (13th) to check out the EAA chapter 709
Spring Fly-In. The big activity for the day was the Pancake Breakfast
followed by a presentation from the team that recovered the P-38 "Glacier Girl."
I came in late as the last of the breakfast crowd was departing. Mike Stewart
was there with his Super RV-8. A light rain shower had crossed the field just as I
was landing. You can see the results on the windshield. Glass panels dominate
his instrument cluster.
Mike found a good use for his old GPS295 -- back seat duty to inform the
passenger of location, location, location.
Since I was late getting there, it was not too long before Mike headed back
home. That longer cowl hides an IO-540 engine and a smoke system.
There was a small sampling of different aircraft types by the EAA Chapter 709
facilities near the end of an abandoned runway here at KRMG.
All types of fixed-wing aircraft were there, from this ultra-light to two
different types of Piper Comanches. That Cessna 172 behind the people is a classic
early 1960's model still wearing the original paint scheme and logos. The Cessna
pilot was flying "Young Eagles" from a local boy scout troop during the day.
The chapter had their pancake breakfast and lunch on the picnic tables under
that shed. The building behind the blue Citabria is the club house. Back in
the trees is another chapter building with showers and flush toilets. They have nice
camping facilities for events like this one.
This classic Peitenpol belongs to RV-8 builder John
Myers. John flew it in from his Flying M Ranch just across the state line in
I had lunch and discussions with John Myers and RV-7A builder Jim Harchanko who
flew in with his grandson from the Huntsville, Alabama area. Jim is part of the TVRVBG organization. I had to head
for home before any afternoon thunderstorms arrived in the Chattanooga area. You can
see that I made it back when the weather was still nice in the mid-afternoon.
Wendell has his Cessna 182 down for annual inspection and maintenance. A friendly
A&P is providing the guidance for the work on the 182. My job is to provide
Wendell with guidance on the RV-8 construction project.
I spent a few hours working with Wendell on his RV-8 project after putting my airplane away. After that, a grocery stop on the way home, with the hail and thunder storms arriving when I was about a mile from home in the evening.
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