Anybody heard of tip fins or tip loading a propeller

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05-10-2018, 10:42 AM
kaneboats

Anybody heard of tip fins or tip loading a propeller

So, I came across this propeller with tip fins on ebay. Seemed kinda strange. The ad said to look up "increasing propeller efficiency with tip fins". Made me wonder if it actually works and, if so, why ACME wouldn't already be doing this. Anybody seen this? Is it just a gimmick? Or is the difference so slight that it is just not worth the cost to produce? If someone posted this on April 1 I would be laughing.

https://www.ebay.com/itm/Acme-537-13...QAAOSwALhaXrX1

https://www.researchgate.net/publica...gh_Tip_Loading

https://www.nap.edu/read/5870/chapter/64
05-10-2018, 10:59 AM
jmvotto

Didn't vornado do this with fans ..
05-10-2018, 11:54 AM
Stazi

Quote:

Originally Posted by jmvotto

Didn't vornado do this with fans ..

Similar in theory as the the winglets on the ends of airliner wings. It helps prevent the pressure drop at the tips due to the vortices that occur there. Would be interesting to see how it performs on a boat, and also if there is an extra noise etc.

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05-10-2018, 12:07 PM
Shoebox

Looks like the q-tip airplane propeller. Seems like a good way to waste $345.

http://m.aviationweek.com/bca/remember-q-tip-prop

https://uploads.tapatalk-cdn.com/201...fa0c9f5d14.jpg
05-10-2018, 12:19 PM
MLA

might just be the pic, but 3 tips look folded and the 4th looks rolled. I dont think the seller realizes they have just a bent prop
05-10-2018, 12:25 PM
Shoebox

Quote:

Originally Posted by MLA

might just be the pic, but 3 tips look folded and the 4th looks rolled. I dont think the seller realizes they have just a bent prop

Sure he does. He also realizes there's a fool born every minute. [emoji23]
05-10-2018, 02:37 PM
kaneboats

Gee, I bent 2 fins on my prop . . . think I'll just bend the other 2 to kinda match . . .
05-10-2018, 02:44 PM
Shoebox

They don't look to be all bent exactly the same. The vibration would be ridiculous.
05-10-2018, 03:11 PM
5:00

"Sold as AS IS condition with no return"
05-10-2018, 03:15 PM
zabooda

Sometimes known as cupped blades.

https://images.search.yahoo.com/sear...f&action=click
05-10-2018, 03:17 PM
Stazi

Quote:

Originally Posted by zabooda

Sometimes known as cupped blades.

https://images.search.yahoo.com/sear...f&action=click

Cupping is typically waaaaaay more subtle.

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05-10-2018, 03:23 PM
zabooda

You think? LOL.
05-10-2018, 04:28 PM
Broke Pilot

Quote:

Originally Posted by Shoebox

Looks like the q-tip airplane propeller. Seems like a good way to waste $345.

http://m.aviationweek.com/bca/remember-q-tip-prop

https://uploads.tapatalk-cdn.com/201...fa0c9f5d14.jpg

Agreed... lol