Model Aircraft


Here's George Ski in a training session. Model air craft powered by two stroke miniature engine flying at 100 to 120 mph, or miniature jet engine performing at 200+ mph. Yes ended it is very interesting sport. Most of all it is a high tech education which will last a life time.  Precision pattern competition flight is a truly wonderful site to behold, not to mention personally participating in this high skill sport.  I had the privilege to enjoy this sport with my kids when they were younger.  Until this very day they are still active in it.  Thank God for this great country and the opportunity to be part of it.

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George and Mark in training

Model aircraft come in various shapes and sizes.  They are powered by two stroke engines ranging in size from .049 cc to .91 cubic inches.  Older, model engine speeds ranged from 10,000 to 40,000 rpm.  Modern  two and four stroke power plants run at much slower speed due to noise and safety restrictions.  Average rpm is at 8500 and spin huge props up to 16 inch diameter and delivering awesome torque at slower rpm.  Modern pattern pilots must execute over 25 precise maneuvers in specific space called a BOX with tremendous  accuracy.

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Model engine design consists of typical two stroke format.  The only difference is that it runs as a diesel and has no need for electronic ignition.  Modification of this type of engine requires precision machining and skillful hands on tuning.  Any mistake exhibits it's displeasure by boring a hole in the ground and as a result you will end up with many wings without the rest of the air craft.  Wings survive 90% of crashes.  Model engine consists of same basic parts which are employed in Watercraft, MX, and Snowmobiles.

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Above: From left to right: Crank, piston, rod, cylinder sleeve, cylinder head, carburetor, and glow spark plug.

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Above: Model engines rely heavily on properly designed tuned pipe. This is where tuner can learn the inner workings of the tuned systems, with out going broke. Knowledge gained in this field will carry over to fool size tuned system designs.

George Grabowski HPT Sport USA