ARF Nobler fuel tanks

Prediction: Some manufacturer will produce 4 1/2 ounce fuel tanks for the ARF Nobler. This will be due to the problem of some engines not having enough fuel to complete the pattern.

The reason that 4 ounces was such a popular sized fuel tank back in the late '50s was the length of the pattern. Back then, you were only required to do one lap between manuevers, and 4 ounces was plenty.

If they are actually 4.0 oz they should be OK for Brodak 40's, FP 35/40's, Fox 35's, OS 35S, maybe others. Not enough fuel for LA 46's for sure-don't know about LA 40's though limited observation indicates they also suck fuel also.

It seems though that I saw that the actual tank capacity was more like 3.5 oz which might make them iffy with all the engines mentioned above. I doubt many will see much competiton beyond beginner pattern anyway if for no other reason than loss of appearance points.

My first Brodak 40 seems pretty thrifty needing only 3.0 to 3.25 oz. The second B 40is not yet broken or totally shook out. Most stock FP 35/40's need about 3.25 with smaller venturi's to 3.5 with larger ones. OS 35S models are all over the place in fuel consumption. Fox 35's seem to burn quite a bit also relative to their performance.

These observations come from 5% to a max of 7.5% nitro fuel,1200 ft above MSL, a variety of needle settings, airplanes, line lengths, mufflers, lap times, etc. There is a significant observed mileage difference even going from 5% to 7.5% nitro.