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DIESEL VS. GLOW WHO HAS THE BEEF?
Just how good are those Davis Diesel Heads, anyway? This is a question which has nagged me since I first had the opportunity to run one while I worked for Cox Hobbies several years ago. Bob Davis and various writers (including myself) have given qualitative judgments that the Diesel converted engines produce less top end peak power and speed, but more static thrust and climbing ability. The purpose of the investigation presented in this article was to answer the question with some good, hard data.
For the glow runs, I used a plug without an idle bar and K & B 1000 fuel (25% nitro) to give me the maximum performance in that configuration. The Diesel runs were done on Davis Diesel 1/2A fuel. To avoid contamination as much as possible, I used separate fuel tanks for the two types of fuel.
This is exactly the sort of performance which Bob Davis has been claiming all along. Incidentally, the fuel consumption of the Diesel was much less than half that of the glow version (7.5 minutes per ounce!), and the fuels used were comparably priced (save money and reduce both the room needed in the front of your model and the C.G. shift at the same time).