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P-38 too Heavy for flight??

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Old 03-04-2015, 07:42 AM
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dscaccia
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Default P-38 too Heavy for flight??

I recently revisited a project I had started over ten years ago - converting a K and A Models P-38 slope to a full functioning aircraft with retracts too! I'm really interested in trying to complete this project now, but I'm worried that it may have gotten too heavy. The wing area is 350 sq. in and the wingspan is 50", which makes it just about a 1/12th scale warbird. What is too heavy?? It weighs 3lbs. without radio gear, motors, battery, etc. When I run ecalc, the plane ends up weighing about 108 oz and says i need to use 5s with large motors! I think I need help. Thanks for any comments.
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Old 03-05-2015, 04:18 AM
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dscaccia
Too heavy to fly? You can make almost anything fly with enough power afterall modern jet fighters have wing loadings greater than a cast iron man hole cover, but at the moment it certainly looks like you are going the wrong way down the weight/power spiral - too heavy needs more power so yet more weight etc and it gets expensive too!
The question really is will flight be achievable at a speed that you are able to safely handle rather than whether it will fly.

The electric K and A 50" P38 has a ready to fly weight of 42 oz so you are over that already with just the bare airframe!
If you have experience in flying heavy planes then it might be ok but I guess you wouldn't be asking the question if you were!
I would put it to one side and build something of a more modest weight. You never know you may be able to complete it satisfactorily when you have more experience in electric flight.
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Old 03-10-2015, 08:20 AM
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Yeah the last thing you want to be flying is a heavy weight P-38. And Lord help you if you loose a motor.
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