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Apr 29, 2008, 03:59 AM
Registered User
please forgive my humble scratching, its been years since I've done any drafting. anyway my generic turnfin, feel free to modify the design(since it has never been made(that I know of) or tested, it may or may not need refinement. hth
rex
edit
when sharpening, you bevel one side only. bevel goes on the side away from the boat(right side for right turnfin, leftside for left fin)
Last edited by Rex R; Apr 29, 2008 at 04:07 AM. Reason: mindfart
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Apr 29, 2008, 06:45 AM
Registered User
Cool, Pimp my address is fhhobbies@mts.net if ya want to send CAD files, ty!
May 01, 2008, 08:40 PM
Registered User
Quote:
Originally Posted by Rex R
please forgive my humble scratching, its been years since I've done any drafting. anyway my generic turnfin, feel free to modify the design(since it has never been made(that I know of) or tested, it may or may not need refinement. hth
rex
edit
when sharpening, you bevel one side only. bevel goes on the side away from the boat(right side for right turnfin, leftside for left fin)
Great job...your humble scratching is much appreciated...one of our clan will be making us up a batch.
May 01, 2008, 09:09 PM
full time pirate
pimp_squeak's Avatar
Quote:
Originally Posted by Rewound
Great job...your humble scratching is much appreciated...one of our clan will be making us up a batch.
Mind mailing me a pair? I can paypal for cost of shipping and whatever the guy making them wants as compensation for time/materials.
May 01, 2008, 09:34 PM
Registered User
Quote:
Originally Posted by pimp_squeak
Mind mailing me a pair? I can paypal for cost of shipping and whatever the guy making them wants as compensation for time/materials.
He is going to make up a couple of dif sizes that we are going to try next week ...before hacking up a bunch of alumnium...but I will put a pair aside and let you know when we have a winner.
May 02, 2008, 12:37 AM
Registered User
I note that the super vee's turn fin is pretty much a simple square...just about any turnfin will be better than no turnfin. you don't want them to 'drag' when the boat is running straight.
May 02, 2008, 01:17 AM
full time pirate
pimp_squeak's Avatar
Quote:
Originally Posted by Rewound
He is going to make up a couple of dif sizes that we are going to try next week ...before hacking up a bunch of alumnium...but I will put a pair aside and let you know when we have a winner.
Perfect, send me a PM when you've got it all figured out and I'll paypal the cash ^_^
May 02, 2008, 01:32 AM
3d and other
kevbeer's Avatar
pimp squeak...export as pdf or dxf.
May 02, 2008, 05:04 PM
Registered User
Rewound, would you like me to post the prop test vid?

Tutor
May 02, 2008, 05:47 PM
full time pirate
pimp_squeak's Avatar
Quote:
Originally Posted by kevbeer
pimp squeak...export as pdf or dxf.

hm?
May 02, 2008, 08:58 PM
Registered User
Quote:
Originally Posted by tutor
Rewound, would you like me to post the prop test vid?Tutor

...I did not know we had some...yes please!
May 02, 2008, 09:43 PM
Registered User


here is a vid I shot of the prop testing on Wed

Tutor
Oct 04, 2008, 10:59 PM
Registered User
Quote:
Originally Posted by Rewound
We are at the moment trying both...In mine 3/4 of the prop is in the water when the boat gets on plane...two of the other boats are running with the prop 1/2 way in the water...so far the jury is still out which will be the best in the end...right now the 1/2 submerged is showing the same speed and drawing a little less amps.

Thanks for the interest.
correct me if im wrong but, if the prop is halfway in the water would'nt it cavitate?
Oct 04, 2008, 11:04 PM
Registered User
Quote:
Originally Posted by Rewound
We are at the moment trying both...In mine 3/4 of the prop is in the water when the boat gets on plane...two of the other boats are running with the prop 1/2 way in the water...so far the jury is still out which will be the best in the end...right now the 1/2 submerged is showing the same speed and drawing a little less amps.

Thanks for the interest.
correct me if im wrong, but if the prop is halfway out of the water wouldn't it cavitate?
Oct 05, 2008, 09:23 AM
dry docked
quicksilver's Avatar
no, it would be a surface-piercing propeller. This actually eliminates cavitation and as this article suggests, replaces it with ventilation.

http://www.well.com/~pk/SPAprofboat.html

Almost all fast electric rc boats use surface-piercing props, the main class of NON-surface(subsurface) racing boats are the ECO class, which is raced mainly in Europe.


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