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minutes on just over 3 ounces of fuel. Once you get a setting for the day it will usually hold plus or minus 15 seconds or so. As the flying season winds down it’s time


to think about maintenance. One pleasant part of Speed Limit, for most flyers, is using plain bearing (PB) engines. Run a PB engine on fuel with some castor oil in it and they are almost maintenance free. The castor protects the crank and wrist pin, the only parts that will really corrode. A few drops of after run oil won’t hurt, but aren’t a neces- sity. Using ball bearing engines takes more work, especially an F2D motor. The ball bearings can be remarkably subject to cor- rosion. When the motor quits running, even if it runs out lean, some fuel remains in the bottom end. Before putting the plane away hook up


the battery and try and start it. Usually you’ll get a short burst. After a couple of tries the motor won’t even pop. Now it is dry, so put in some after-run oil and flip the prop to work it in. Skip the clean up run and the main bearing can corrode quickly, some- times just overnight, so take care of those bearings. Cleaning the motor after a crash takes


more work. Sometimes at a contest you’ve got to put a motor that hasn’t been properly cleaned to win, but it can be costly. Espe- cially bad is when the ground is very soft and the plane goes straight in. Soft dirt can get into the crank and even up into the by- passes where you can never get it out dur- ing a match. Soft dirt will blow through, but it always takes a toll on the piston and sleeve. A modern ABC motor can run hundreds


of times if it is kept clean. Running dirt through it can wipe out the piston fit in just a couple of runs. One of the nice things about the LA engines, as inexpensive as they are, is that even when the piston and sleeve are totally clapped out the motor will usually cold start pretty well and run well. When it comes down it can be a bear to start, even when you flood the case with fuel to cool it down. It takes a very prac- ticed prop flipper to get it restarted quick- ly. That is the signal to put in a new piston and liner. Post season cleanup should be routine.


Get some kerosene and an empty paint can (clean inside). Make a circular basket out of a piece of window screen bent to sit a quar- ter inch or so off the bottom of the can. Take each motor, pull the plug and backplate, and the prop driver on a ball bearing en- gine. Swish the motor around in the kerosene a bit and scrub off the outside of the case to get all the dirt off. Shake off the excess kerosene, put the mo-


tor back together and put in some after run oil. Kerosene will evaporate almost entirely and may leave a bit of stuff inside. The after run oil will take care of that. Really dedi- cated F2D will do this clean up after every day of flying. A lot of work but does prolong the life of the engines.


FLYING MODELS 55


Larry Wilks gets a perfect launch for Dan Banjock. Dan got some lumps this time out (above). Roy Glenn shows Larry Wilks how to get a cut or two (below). The most basic skill is lining up for a cut in level flight.


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