John Minchell Posted April 25, 2021 Share Posted April 25, 2021 What is the usual fuel tank size people put in their models for say a 40, a 60 and a 120 size glow 2 stroke to give enough time for a full schedule and a bit spare for an aborted landing and go around again? John M Quote Link to comment Share on other sites More sharing options...
Keith Berriman Posted April 25, 2021 Share Posted April 25, 2021 Hi John M curiously I was searching same info yesterday I have an OS46 AX and the leaflet says consumption on full power is 30cc per min or 1oz in other terms. It was reccomending a 300 c or 10oz tank for good 10 mim flight Hope the helps Quote Link to comment Share on other sites More sharing options...
Nigel R Posted April 25, 2021 Share Posted April 25, 2021 Thats 10 minutes of never moving the throttle... I would probably use a 9oz for a 45, 12oz for a 60. Bears repeating that low nitro means lowers consumption, as does lower oil. Quote Link to comment Share on other sites More sharing options...
Don Fry Posted April 25, 2021 Share Posted April 25, 2021 My formula is, 2 stroke, take the cu inch number, say a 120, call it ounce, and multiply by 1.5. Therefore a 120 is, 12*1.5= 18 oz tank. Use next size tank up, so I would expect that to be a 20 oz tank. 4 strokes, take same numbers, but use a tank next size down, so a 15 oz tank. An apology for the misuse of units, a barbarian system. It does for 12 minutes of hooliganism, and no worries about fuel shortage. Quote Link to comment Share on other sites More sharing options...
Phil McCavity Posted April 25, 2021 Share Posted April 25, 2021 Personally, I'd stick with the Oz per min as recommended because I like the idea of basing the capacity on an engine running at WOT so when flying in real time there is always a reserve if you use the calculated figure. Quote Link to comment Share on other sites More sharing options...
John Minchell Posted April 26, 2021 Author Share Posted April 26, 2021 Thanks all - enough there for me to figure something out. Quote Link to comment Share on other sites More sharing options...
Nigel R Posted April 26, 2021 Share Posted April 26, 2021 Lots of plans around that show 14oz - 16oz size on classic era 10cc F3A types. Quote Link to comment Share on other sites More sharing options...
Don Fry Posted April 26, 2021 Share Posted April 26, 2021 But those F3A things run on a pipe. Drink fuel. Quote Link to comment Share on other sites More sharing options...
Nigel R Posted April 26, 2021 Share Posted April 26, 2021 They might do, and might do. Are you going for running flat out at 15k - 17k on older (and louder) ballistic aerobats, or at 10k with lots of throttle use for constant speed? Quote Link to comment Share on other sites More sharing options...
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