Seaplanes Aircraft that typically take off and land on water...radio control seaplane discussions are in here.

Prop spray

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Old 10-12-2011, 11:43 AM
  #1
dabrown
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Default Prop spray

Is there a good way to stop water from being sucked into the prop? My quasi-modified-Sportster 90/120 uses a 16-8 prop which is around 5" above the water but it will always pull some water and that really slows it down.

Would adding strakes or deflector strips to the inside edges of the floats do any good? Or is it that the prop is sucking water directly from the surface of the lake...

I will be going to a shorter prop this weekend, maybe a 15-10 or 14-10 if I can find such.

Dave
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Old 10-12-2011, 12:46 PM
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Default RE: Prop spray

Got any pictures taking off in that pool, one landing would would nice too. Adding a spray rail to the inside of each float could help.
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Old 10-12-2011, 01:36 PM
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Default RE: Prop spray

Sure, I do touch and goes all the time in the pool. The only hard part is dodging the swimmers... No pics of it though too hard to fly and operate camera at the same time.

May go ahead and try the spray rails. Hopefully can find some easy temporary way to test it out before spending alot of time...something involving duct tape I'm thinkin'

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Old 10-12-2011, 01:53 PM
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Default RE: Prop spray

I cut my spray rails out of a sheet of ABS. The float plans (Great Planes) included a pattern. I just stick them on the floats, which are finished with monokote, with double-side servo/foam tape. Works great and I have only had to replace tape twice in about 6 years.

It really keeps the spray off your prop.
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Old 10-13-2011, 05:58 AM
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Default RE: Prop spray

Looks like you did exactly what this Cessna has. For some reason I was thinking of something different. Obviously I wasn't thinking at all.

I have the ABS and double-sided foam tape...problem solved!

Thanks.
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Old 10-13-2011, 08:48 AM
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Default RE: Prop spray

Wish I could take credit, but it was right off the Great Planes instrucitons. They call them splash strips in the instructions and spray rails in the drawing, here are pages from the instructions that shows what they suggest and the patterns.

Good luck, let us know how it goes this weekend.

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