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Old Mar 08, 2015, 05:18 PM
jrosen9 is offline
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Scaling Down Plans

I've found some plans that I really like, however, they are too big for my use. I've scaled the plans down in a cad package and have started working on creating a model of all of the parts so I can see how everything goes together. As for thickness, I've made each part equivalent to the nearest 32nd for material purposes.

My question, is there anything I need to be concerned about when scaling down plans or should everything work out if I just scale the wood parts to the right size and size the prop motor battery etc to the right size should everything work out?

Thanks,

Joshua
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Old Mar 08, 2015, 05:37 PM
Jim Young is offline
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Hi josh,

I sounds like you are on the right track. A lot depends on how much you are scaling down, and you can get into a situation where things are over designed. For example. if you were going from a 50"wing span to a 25" wing span, the smaller model would probably be too heavy. If you are going from 50"to 40", this approach should work fine.

-Jim
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Old Mar 08, 2015, 05:37 PM
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My experience which comes mostly from free flight models is that you only need to be aware of areas where stress might be a factor and maybe you beef them up, or not. As for wood sizing you have done what I always do, just adjust to the nearest available wood size.

George
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Old Mar 08, 2015, 06:29 PM
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Compare your scaled down plans to similar sized models to see if you are using similar structures . One thing to remember, larger aircraft are typically set up for internal combustion engines. Electrics can be built lighter because of less vibration and need to be because the heavier fuel (batteries).
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Old Mar 09, 2015, 08:04 AM
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I find it handy to keep a collection of other folks' models, to see how they did some of the engineering, and to see what sizes of wood to use.

If you go to the RCM Plans thread in this forum: http://www.rcgroups.com/forums/showthread.php?t=2233857
you'll find a large collection of models of varied size and structure, most of the plans and instructions being in .pdf format. I recommend collecting some of these and using them as reference.

CD
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