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Fuel Consumption
Does anyone know how to calculate fuel consumption of a 50cc engine turning 8k rpm, using 50-1 oil mix. I know...many variables, but I don't want to tote more fuel than I need. I'm planning for smoke also. The a/c is a Extra330L Tnx Zee |
RE: Fuel Consumption
I figure about 1 ounce per minute
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RE: Fuel Consumption
Hi,
a 50 cc engine at max throttle burns very close to 50 cc/min. With 30 cc per ounce, that is a fuel consumption rate of 1.66 oz/min. These estimates are very close based on my experience. Elson |
RE: Fuel Consumption
Works for me. I'm not allowed to provide those kinds of specifics anymore.
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RE: Fuel Consumption
It's easy enough to measure fuel consumption. If you have a decent scale with the engine on the test bench weigh the fuel tank before and after running the engine for a known amount of time take into account fuel density and do the math.
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RE: Fuel Consumption
How many will do that? Most won't even turn the needles on their carbs let alone measure something:eek:
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RE: Fuel Consumption
The people who actually want to know.
The other way to do it which is even easier, is to put your fuel into a syringe without the plunger. Hook the fuel line to the outlet and time the run. |
RE: Fuel Consumption
In my research "business" and others, the actual fuel consumption is an important piece of information.
Elson |
RE: Fuel Consumption
ORIGINAL: rc bugman In my research "business" and others, the actual fuel consumption is an important piece of information. Elson In my old bussiness of aircraft maintance, Specific Fuel Consumption of an engine was very important! But I guess some of the half answers, by some wits, is better than none!!! LOL Zee |
RE: Fuel Consumption
ORIGINAL: ZebraOne Does anyone know how to calculate fuel consumption of a 50cc engine turning 8k rpm, using 50-1 oil mix. I know...many variables, but I don't want to tote more fuel than I need. I'm planning for smoke also. The a/c is a Extra330L Tnx Zee :D |
RE: Fuel Consumption
I agree with the capt... folks might plan to carry X ounces of fuel on board, based on an ounce per minute quote at full throttle, assuming the highest possible draw, with given prop...etc. However, if you are like me, I only like to carry what I need, and not much if any more. I see no point in carrying the extra weight in the planes I fly.
Since you are looking to run smoke, I completely understand your need to figure out what you must carry, vs what would simply work, so you can fit the tanks in place without fussing later. I went this route, with a WOT quote, given prop, on a ZDZ80, and tanked my plane accordingly. I flew the snot out of it, several flights, exactly how I fly, not WOT the entire flight, of course....and I found after many flights, I would consistently use only a little more than 1/3 the recommended tank size for a 10-12 minute flight. I then went back in and retrofit a more appropriately sized tank for my application. Perhaps before going with smoke, go with what the capt suggests. Put in a rough guess on tank size...fly and measure. Then permanently mount what you will know work for your application and flying style. |
RE: Fuel Consumption
I agree. The only way you can figure this out is by testing. I have several DA-50s and each consumes a different amount. 1oz. per minute is a good starting point for a well tuned and broken-in engine, but the type of flying you do, together with ambient temperature, changes your consumption. ORIGINAL: captinjohn ORIGINAL: ZebraOne Does anyone know how to calculate fuel consumption of a 50cc engine turning 8k rpm, using 50-1 oil mix. I know...many variables, but I don't want to tote more fuel than I need. I'm planning for smoke also. The a/c is a Extra330L Tnx Zee :D |
RE: Fuel Consumption
ORIGINAL: arobatx I agree with the capt... folks might plan to carry X ounces of fuel on board, based on an ounce per minute quote at full throttle, assuming the highest possible draw, with given prop...etc. However, if you are like me, I only like to carry what I need, and not much if any more. I see no point in carrying the extra weight in the planes I fly. Since you are looking to run smoke, I completely understand your need to figure out what you must carry, vs what would simply work, so you can fit the tanks in place without fussing later. I went this route, with a WOT quote, given prop, on a ZDZ80, and tanked my plane accordingly. I flew the snot out of it, several flights, exactly how I fly, not WOT the entire flight, of course....and I found after many flights, I would consistently use only a little more than 1/3 the recommended tank size for a 10-12 minute flight. I then went back in and retrofit a more appropriately sized tank for my application. Perhaps before going with smoke, go with what the capt suggests. Put in a rough guess on tank size...fly and measure. Then permanently mount what you will know work for your application and flying style. |
RE: Fuel Consumption
If you fly a similar routine you can do that. Years ago when electrics only flew for 4-5 minutes I had my flights down such that I would start my approach when my timer went off. I had just enough power to land on the first attempt every time. Nothing less, nothing more. I made the most of the battery I had on board. I became very good at landing this way, when I knew I was committed because there wasn't going to be a go around. I did break one airplane though, flying at an unfamiliar field.
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RE: Fuel Consumption
ORIGINAL: arobatx I agree with the capt... folks might plan to carry X ounces of fuel on board, based on an ounce per minute quote at full throttle, assuming the highest possible draw, with given prop...etc. However, if you are like me, I only like to carry what I need, and not much if any more. I see no point in carrying the extra weight in the planes I fly. Since you are looking to run smoke, I completely understand your need to figure out what you must carry, vs what would simply work, so you can fit the tanks in place without fussing later. I went this route, with a WOT quote, given prop, on a ZDZ80, and tanked my plane accordingly. I flew the snot out of it, several flights, exactly how I fly, not WOT the entire flight, of course....and I found after many flights, I would consistently use only a little more than 1/3 the recommended tank size for a 10-12 minute flight. I then went back in and retrofit a more appropriately sized tank for my application. Perhaps before going with smoke, go with what the capt suggests. Put in a rough guess on tank size...fly and measure. Then permanently mount what you will know work for your application and flying style. Zee AMA129570 |
RE: Fuel Consumption
You can always install a tank larger than necessary and measure the flight time against fuel use. Then you can adjust the fill by lowering the vent tube.
Also tanks are inexpensive and you can easily change the tank size later if desired. I would start with a 12 to 16 oz tank. Bill |
RE: Fuel Consumption
The weight of the fuel is such a small percentage of all up weight that you can easily carry 50% extra an not even feel the difference.
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RE: Fuel Consumption
I agree with you in some applications, but not all of them. It is the same story with redundant batteries/switches, switching to A123 cells from multiple NiCd or NiMh to save ounces, carbon gear from aluminum, wing tubes...the works. We all learn eventually that it is not a single component choice and weight savings of a few ounces that makes a difference, its consistently choosing that way, when appropriate for the model and flight performance desired.
One example would be the 24oz tank I used to fill completely on a G62 powered ultimate, which I replaced with a 16oz (still more than I need), and the 11oz slimline wrap around muffler that was replaced with a 3oz alternative that ended up performing better. I understand that fluid ounces are not weighed similarly, pending the type of fluid, but it does add up! Losing a pound on a 16 lb model makes a BIG difference. I wouldn't treat warbirds like I do Imac or 3d machines, I like the locked in feeling the added weight provides in the warbirds. |
RE: Fuel Consumption
ORIGINAL: BillS You can always install a tank larger than necessary and measure the flight time against fuel use. Then you can adjust the fill by lowering the vent tube. Also tanks are inexpensive and you can easily change the tank size later if desired. I would start with a 12 to 16 oz tank. Bill Exactly what I did! God knows, there's a cavern in the belly of this beast!:D By some calculations, burning 1.25oz a minute would make for a short flight, but I don't fly with the hammer down all the time! WOT only when necessary! If I can get an average of 10>12 minutes, I'l be happy! Share the air, I say!:D Have fun...that's what it's all about~~~~~ Zee AMA129570 |
RE: Fuel Consumption
ORIGINAL: BillS You can always install a tank larger than necessary and measure the flight time against fuel use. Then you can adjust the fill by lowering the vent tube. Also tanks are inexpensive and you can easily change the tank size later if desired. I would start with a 12 to 16 oz tank. Bill |
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