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What ie ratio of ducted fan dia. to outlet dia. on plane?

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What ie ratio of ducted fan dia. to outlet dia. on plane?

Old 09-01-2019, 12:05 PM
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Default What ie ratio of ducted fan dia. to outlet dia. on plane?

I got a ducted jet someone else built and gave to me. He put a 70 mm fan unit in a 30 inch wing span jet that has a 55 mm outlet hole in it. Plane will not get off ground from paved runway or "just flies" if it does make it to air.This person put a 6s 2150 KV fan motor on this small plane, but I think he used a 3s or 4s battery. Plane is way under powered and no way to put a 6s battery in it. Weight of plan with out battery is 28 OZ. I am thinking a 64mm set up for 3s or 4s would make a better fit and with higher KV motor of around 3500 plus KV should put out around 30 OZ thrust. I think that should fly at a reasonable speed for first time jet pilot. Any help here would be greatly appreciated by me. Thanks for your time.
Old 09-01-2019, 04:49 PM
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use an area number based on fan swept area(diameter of fan blades minus the diameter of hub/motor).
depending on total number of blades(fan density), a percentage of the fan swept area of a minimum of 85% up to 100% or greater is recommended.

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