lift pressure - RC Groups
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Jul 27, 2017, 10:13 PM
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lift pressure

I'm building a bagged hovercraft that measures 48"x30". I will be using 2-400w counter rotating motors 5x4.5 3 blade props to fill the bag and create the lift. Lift air will be what exits 6, 1" diameter holes from the air bag. The lift motors are mounted on either side and approximately 1/3 of the way from the front. The estimated

Will I get enough air flow to create enough lift or will I need more air flow from the bag?
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Jul 28, 2017, 12:38 PM
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raw89's Avatar
Total flow needed depends on weight, shape, ducting, etc. Start w/ fewer or smaller holes and keep increasing them until the bag pressure is just slightly higher than the bottom lift pressure (the bag will get softer & the bottom skirt gap will increase).....good luck....send pictures....
Jul 28, 2017, 01:38 PM
Registered User
The bag is going to be rectangular, the lift motors will be mounted in vertical ducts that with minimal clearance for the props. I'm going to try getting enough lift to handle a total weight around 20lbs.
Jul 28, 2017, 08:17 PM
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raw89's Avatar
20 Lbs???? I'd say that's about 10 times what's feasible w/ your hardware......
Jul 29, 2017, 09:02 AM
Registered User
I'm gonna test it before I get to far into it. If it doesn't work I will make changes based on how it performs. Either add another set of lift motors or go a completely different direction.

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