About this Plan
MG-2. Radio control vintage model for 1/2A Texaco event. Wingspan 51-3/8 in, wing area 300 sq in.
Quote: "Mike Granieri 's classic MG-2 is one of the most popular antique designs in the East. For years, Mike has been campaigning his original 108 inch span version, which he flew first in the 1936 NAA nationals. In recent years, Mike has made scaled down plan sets available, with designs suitable for .15 engines, .23 engines, .29 engines, and .40 en-gines.
With the phenomenal rise in popularity of the 1/2A Texaco contest event in Old Timer Competition, it was natural that the MG-2 would be scaled down to compete.
The optimum wing area for this event is about 300 square inches, and the plans we present here are for a 305 square inch MG-2, with a minimum weight of 17 ounces, based on 8 ounces per square foot of wing area.
We will not present a step-by-step con-struction article but will provide construction notes, hints and kinks to help builder.
Construction notes: Wing. The wing on an MG has an unusual tip configuration. The key to understanding the correct tip shape is to remember that the top spar is flat. Thus, the airfoil at the top of the wing is the same from root to tip. The bottom main spar tapers up to meet the top spar in the outer four bays. The leading edge of the wing also rises at the tip. Be sure the wider wing ribs (1A) are aligned with the wire cabane bars.
Fuselage and Tail. The fuselage structure has been designed to facilitate covering with plastic film type coverings. It can be built lighter but there is really no advantage to this for competition because you will have to add ballast to meet the minimum weight limit of 17 ounces. To align the finished model, block the cabane bars the right dis-tance apart to match the 1A wing ribs, then turn the fuselage upside down on the cabane and mount the stabilizer to a flat surface.
Engine. The best power plant for this model is the Cox Black Widow. For 1/2A Texaco competition it is recommended that you use a Top Flite nylon 7 x 6 prop or a Rev-up 8 x 4 prop. For duration you will have to move the fuel pick-up to the bottom of the tank. You will probably find that with the large props recommended above, the engine will run better in hot summer weather if you add an additional brass washer under the glow plug. Because the engine will run about six minutes on a tank of fuel, it is a good idea to wrap some teflon pipe thread tape on to the threads of the needle valve to keep the needle valve from vibrating and turning during the flight.
Flying. Just to give you an idea of the equipment suitable for a plane this size, I might mention that I use a two channel Futaba receiver complemented by a 225 mAh battery pack..."
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Supplementary file notes
Article pages, thanks to RFJ.
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User commentsOriginal Specs as per Mike Granieri for the MG-2:
Effel-431 Neg. Trailing Edge
Effel-431 Neg. Tips
Effel-400 Neg . Tips
Symmetrical Airfoil Stab
Lifting Airfoil Stab
Mike Salvador - 24/02/2021
Hi, I have just finished an MG-2 to the plan in your library [main pic, 005-008] and have done a log for it on RC Groups, see https://www.rcgroups.com/forums/showthread.php?3962843. These pictures or some of them could be added to the page if you wish. Cheers,
Allan Knox - 15/09/2021
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