Prop Tongue

[Steveo63]

Hi
I am fairly new to RC boats as I have recently bought a Revolt and have enjoyed it heaps. I am interested in experimenting with different props and I have been reading articles about sharpening and balancing them. The one thing I don,t understand is why de-tongue the prop. What effect does this have on the boat. Why do they cast a prop with a tongue when :huh:we are going to remove it.
Can someone please explain.
Cheers Steve.

[Fluid]

http://forums.offshoreelectrics.com/showthread.php?12920-Sharpening-Balancing-and-Detongue&highlight=detongue
http://forums.offshoreelectrics.com/showthread.php?29137-X-amp-M-prop-series&highlight=prop
http://forums.offshoreelectrics.com/showthread.php?26224-prop-modifying&highlight=prop




.

[bob_t]

Octura makes the "M" series that are de-tongued "X" series props. Taking some of the tongue out of the prop unloads the prop, letting it spin faster (less blade area to "bite") and can change the characteristics of the prop. The amount of blade area can have different effects on how the boat carries the bow, can add/subtract stern lift, and can affect prop slip (how efficient the prop is). Most of that stuff is application and/or individual hull specific (how close to the "desired" shape the hull actually is, for example fore-aft twist in the hull, hook in the bottom, etc) in addition to just the general application (catamaran, deep V, shallow V, displacement hull, etc). When someone "finds" a prop that works for a particular boat, that is a great step forward for everyone else that has that same model, as it gives them a good starting point.

[Steveo63]

Thanks guys for the info. I now have a much better understanding of props and how they work.
I am very glad to have joined the OSE forum as there is so much to learn from you experts out there. I live on the west coast of Australia about 3mins from my local pond where we are fortunate to have boating all year round wife permitting.

[785boats]

Steve.
For a bit more understanding on props, SweetAccord has three pages of info in a 'sticky' at the top of the 'Props' forum page. Here's the link.

http://forums.offshoreelectrics.com/album.php?albumid=991

[seehuusen]

sweet link! Thanks 785boats :)

[785boats]

Glad to help seehussen.
But SweetAccord deserves your thanks for putting all that info in one spot.