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Building Tips and technical articles. => Building techniques => Topic started by: Donald R Olson on December 07, 2022, 01:50:46 PM
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What is a good weight to shoot for? I am building a Electric powered Stunter. It will have a 3300 4 cell battery, 70 amp ECS, 35-36 motor. All the electric components alone weight a pound! HB~> what is the average wieght with the wing span of 52" wing area guestamated at 500 sq inches, full fusalage, foam wing sinked with 1/16" balsa and .5 oz fiberglassed.
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60 ounces ready to fly.
Be ready to accept 65 plus.
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Wing loading of 12-13oz per square foot is acceptable.
What is a good weight to shoot for? I am building a Electric powered Stunter. It will have a 3300 4 cell battery, 70 amp ECS, 35-36 motor. All the electric components alone weight a pound! HB~> what is the average wieght with the wing span of 52" wing area guestamated at 500 sq inches, full fusalage, foam wing sinked with 1/16" balsa and .5 oz fiberglassed.
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Thanks for the info. Right now I think it will be about 62 to 64 oz. The paint is really adding up the wieght. It's good to know It's not too far out of the ballpark.
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Not sure what motor you are proposing. I find 16oz a pretty light setup but that is not my point. Pay attention to what Dave Rigotti said. Acceptable wing loading is in the 11-13 oz range. 15 can be trimmed to fly well if you have a good motor. What you are targeting is closer to 17-18. When I build my target weight is always 13oz @ sqft. Is there any way can lighten the load? When that size plane was the "state of the art", they weighed in around 28-35 oz dry, certainly under 40. I know it is probably too late to do much but if it is not finished - think light!
I flew an enlarged (510 vs 490 sq") Sig Twister for practice for a couple of years. It weighed 52 oz WITH a 2800 4s battery and a Cobra 2820/12 motor. That is a wing loading of 15 and it flew like it was heavy, but it did fly well.
Ken