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Building Tips and technical articles. => Building techniques => Topic started by: Ken Culbertson on March 04, 2018, 04:06:26 PM
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I am building a profile testbed to get things right before building a real airplane and I have a question on component weights. This beast will be powered by an OS46FX which is HEAVY but powerful. I am not the scientific type so I need some help answering a weight distribution question. By nature I build light. My .35 size planes were always under 40oz. Now I am in a totally different world and I don't know what things should weigh.
I don't like adding weight to get the CG right although it is almost always necessary.
The finished stab weighs in at 80 grams unfinished. I plan to use Monocoat so the finish will not be too heavy. Is this heavy for a stab on a plane this size (620 sq")? Is it better to add strength to the tail and fuselage knowing that I have a 14 oz of lead in the nose already.
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Sit down and start reading through the posts of the build threads on this forum. Yes it will take time and as for me a couple of pots of coffee to read them. VD~
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Sit down and start reading through the posts of the build threads on this forum. Yes it will take time and as for me a couple of pots of coffee to read them. VD~
Been there, done that, ran out of coffee. That is why I posed the question. Very few people use the FX. Most everything I found was for the LA and absolutely nothing on the concept of intentionally building a heavy rear end instead of adding tail weight.
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Well one way is to move the engine back on the mounts. Granted you may have to cut into the leading edge of the wing for a fuel tank. D>K
Also adding a longer fuselage for the tail surfaces shouldn't hurt that much. In fact it will give the elevator more power to maneuver. D>K
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Well one way is to move the engine back on the mounts. Granted you may have to cut into the leading edge of the wing for a fuel tank. D>K
Also adding a longer fuselage for the tail surfaces shouldn't hurt that much. In fact it will give the elevator more power to maneuver. D>K
John, Ken.
When faced with cutting in to leading edge for tank space on a few profiles, I have mounted the tank on the inboard side of the fuselage to eliminate weakening the LE. Have flown most of the pattern with this configuration , no fuel feed problems. Comments anyone?
Roger V.
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I run nearly all my profiles with the tank inboard.