Welcome to
FLY-UL.com
Bob Comperini's Ultralight And Sport Pilot Web Page

Google

September 1, 2005

The following crash report comes from ultralight pilot Marty Lunsford, from North Carolina. Marty suffered injuries as a result of a recent crash. Ironically, he happened to have a video camera mounted on his plane, and running at the time of the crash. I applaud Marty for sharing his story with everyone, and for being candid about "mistakes" he may have made. We can all learn from this. (Remember, "Have Fun, Fly Safe")- Bob Comperini

Marty Lunsford's Crash

Background information from Marty (sent to one of the Yahoo groups):

From: Marty Lunsford
Date: Sat Aug 6, 2005 11:05 pm
Subject: I just flew my MX for the first time today...

... and I'm a little scared to fly it again. I have about 100 hours in Cessnas, and I figured that an MX would be pretty easy to fly. I bought a used one and took it to the airport for the first time today. I spent 30 minutes taxiing it, gradually going faster and faster. Eventually I was lifting the nosewheel off the ground and doing high speed (18 mph) taxiing on the main gear. Then I figured I'd do a "crow hop". My intention was to never get more than 2 feet off of the ground, but within a couple of seconds I was 40 feet up in the air with the stick almost fully forward. I coaxed it back down to the ground, and since I still had 3500 feet of runway left, I did it again, only this time I managed to keep the plane no higher than ten feet.

I spent another 45 minutes doing these "crow hops", and on my final one, I felt comfortable enough to take it around the pattern. Once I was up around 400 feet (I'm guessing, because I don't have an altimeter) I turned left and felt like I was using almost full RIGHT spoiler to keep the plane from rolling over to the left. In hindsight, I realize that with all of that dihedral in the wings, any rudder is going to cause the plane to bank pretty hard. It just felt like an uncoordinated turn, though, and I had to use a lot of right spoiler to keep the plane "feeling correct" in the left turn.

The downwind leg was pretty cool. I had a much better view of the terrain than I normally do in a Cessna, and I was starting to learn that the MX really steers with the rudder; unlike a 172 where you bank the plane to turn, and just use the rudder to keep from slipping. It was 11:00 AM by this time, and the wind was calm on the ground, but I could feel the thermals starting when I was on the downwind leg. It seemed hard to keep the thing going straight. The spoilers seemed ineffective, and the rudder made the plane want to bank. I felt very uncomfortable turning base and then final to land.

On a positive note, I put the plane down exactly where I wanted-- about 200 feet past the numbers. The descent angle seemed very steep, but the guy I bought the plane from told me to expect that, so I wasn't surprised.

Anyway... I have some questions: Is this experience typical for a GA pilot flying an ultralight for the first time? Does my description of the way my plane was flying sound normal to you guys? I had to use a lot of forward stick to keep the plane flying level. Does it sound like I have a CG issue? I have the seat mounted in the back position and I weigh about 170. I was going to go flying again tomorrow, but I'm a little scared right now. I'm thinking about bringing the plane home and adding some weight to the nose.

Ya'lls input is greatly appreciated.

Marty's explanation of the crash:

On Saturday, August 27th 2005 I took my Quicksilver MX to the Raleigh (NC) East airport to do a little flying. On previous flights I had noticed that the engine was only developing about 5700 RPMs at full power. It should be hitting about 6200 RPMs, so a friend of mine, who is familiar with 2 stroke engines and carbs, met me at the airport to see if we could tweak the engine a little.

When I first pulled the plane out of the trailer, I noticed that I had left the fuel valve on after the previous flight. As a result, the air filter was saturated with fuel and oil, and it was even dripping off of the filter. After assembling the plane we tried to start the engine. It normally only takes a few pulls to get the engine going, but this time it took several minutes. We turned off the fuel valve, opened the choke, and opened the throttle to pull lots of air through the engine. Eventually it caught, and we let it run at about 2500 RPMs for a few minutes to warm up.

After the engine had warmed up, we ran it up to mid range, and then full throttle to check the RPMs. It was still only hitting about 5700, so we throttled back to idle and I went to get the Cuyuna manual while my friend held the plane. We looked at the diagram of the carburetor in the book, and after a minute or two, realized that the carb on my plane was slightly different from the carb in my book. Realizing that we weren't going to be able to make any adjustments right then, I decided to just go fly a little.

Here is where the memories of my friend and I break down. We think we had turned the fuel valve at the bottom of the fuel tank back on, but we're not really sure. I had already done my preflight and walkaround, so I didn't check the valve immediately before taxiing out to the runway. The video shows the outcome of the flight.

I was taken away by ambulance, and the next day a couple of friends went back out to the airport to put the wreckage back into the trailer and take it to my house. I asked them to check the fuel valve to see if it was on or off. When they got to the airport, the fuel valve was OFF, but the fuel filter, which is located between the tank and the carb, was full of fuel (it has a clear cover). We don't know how long the engine will run with the valve in the off position, but I suppose it could idle for several minutes, just sipping on the fuel in the carb bowl and the filter.

However, we had the engine running at various power settings for approximately ten minutes before I actually took off. I don't think the engine could possibly run that long if the valve was off, so I'm assuming we turned it back on. But that is one of the "unknowns".

If we had turned the valve back on, then how did it get turned off before my friends picked up the plane the next day? Well, I crashed right next to an airport, and some of the people who came to rescue me were from the airport. It is possible that one of them had enough airplane smarts to realize that the fuel valve being "on" was a safety hazard. Maybe they turned it off shortly after my crash. That would make sense, since the valve was off, but the filter was full of fuel. Of course, all of this is just a guess.

My friends also told me that the prop turned freely, so the engine didn't seize. They tried to start it, but it would not start.

I have also been wondering about the engine kill switch. The previous owner of the plane told me to be careful of it because it was easy to kill the engine when grabbing ahold of the tube by the pilots head. Looking at the video, I clearly did not grab that tube until after the engine died, however, the switch might have some corrosion in it which caused it to short out, or the wire may have gotten pinched somewhere, and the vibration of the engine may have caused it to short out.

It will be several weeks before I have recovered enough to investigate what caused the engine failure. I'll update you when I have more info.

Things to notice in the video:

Hope ya'll can learn something from this.

- Marty Lunsford

Google


About me Copyright © 2000-2017, Bob Comperini - All Rights Reserved
This page updated on: January 16, 2013
Back to FLY-UL.com