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Bob |
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Joined Jul 2013
10 Posts
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Quote:
I went through your comments, rethink about the problem. I will try to steal the weight, such as make a new stabilizer and vertical fin, replace the main wing with a no glass fiber one, or even cut some unnecessary part of fuselage. Just set the target as 5 - 6 Kg of total weight. Thanks for the comments from all of you, really help a lot |
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Joined Jul 2013
10 Posts
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The progress
With your kind concern and suggestions, It takes a long time for me to reduce the weight of the model.
About 1.5 Kg was cut off, the weight is normal now, and the CG is in the right place after I moved back the main wing around 10cm. |
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I'm confused by the 3 wing tubes. If the rearmost wing tube is now the new location, there looks to be inadequate support for it. And why was the forward wing tube added?
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Des Moines, Iowa USA
Joined Nov 2007
7,494 Posts
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I’m not sure there is enough structure left to stand up to a 50 - 55 engine. The maiden might be quite the spectator event.
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What's going to explode first? Wings or fuse?
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Des Moines, Iowa USA
Joined Nov 2007
7,494 Posts
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It looks like it's still fiberglass (?) covered, loosely in most spots, and any pertinent structure is removed or gone.
As we know, film covering done properly will add quite a bit of structural integrity, combined with a proper frame as a base. Whether it be stringers or sheeting (lightweight balsa), and most times both. I'm seeing loosely covered fiberglass or something that won't offer anything in the way of structure or rigidity. At least tight film would hold it together for who knows how long.. not long though with no structure under it. On this particular frame I'm not seeing anything in the way that will provide rigidity or triangulation, and not even the covering will provide any tensile or torsional strength. Even some lightweight balsa sheeting on the sides would help, but the rear turtle deck is so compromised and who knows what the belly looks like, I'm sorry to say it looks like a boatload of work for who knows what will happen. It's not a mystery as to the what, it's a question of how and when something fails. Seriously no disrespect, but I'm not getting this. Maybe the guy has a different vision, and I'm curious what the goal is. If it's a static model that resembles an aerobat that's cool and very possible. If it's supposed to be a model to fly, then someone has much to learn. I suggest looking into the "Build threads" and studying, and studying airframes and structure. I think I can safely say we want to see people do well, and I say too, just keep trying. |
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Joined Jul 2013
10 Posts
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thanks for the "warm" and kind words first.
I spent more than one year learning the Structural Analysis of Aircraft course and doing the necessary analysis to ensure it was strong enough for flight. Although I do not worry a lot about the strength, as almost the whole structure is fiberglass, you do remind me to take care the maiden. There are 3 wing tubes, but only two would be used. When an aircraft project is already on the way, at least it should be finished and fly. Even the maiden failured, some lesson-learn is still not bad. |
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