UK-Cherub Forum

Cherub Chat => Tech Chat => Topic started by: JP233 on August 27, 2015, 03:28:19 PM

Title: Rudder stock flange.
Post by: JP233 on August 27, 2015, 03:28:19 PM
One of the many things I didn't do this nationals was to look at everyone's rudder stocks.
Does anyone know how big the plate making the bottom gudgen should pertrude around the stock?

Currently mine is quite big/heavy and could quite easily be a second planning surface.
Title: Re: Rudder stock flange.
Post by: RobinJones on August 27, 2015, 05:30:43 PM
Guess you're on about the flange around the stock where the bottom gudgeon is?

Of all the stocks I have, 2 are I14 stocks - these have about 0.5cm all around, but more at the front and back. I also have an aardvark stock which split up the back edge (including the flange). this has perhaps 0.75cm around the sides, but it tapers out slightly towards the edge.

Not at all an expert, but from this, I'd have guessed between 0.75 and 1cm all around, with plenty of material around the trailing edge to tie the back of the stock up.

What thickness of plate are you using?
Title: Re: Rudder stock flange.
Post by: JP233 on August 27, 2015, 07:04:26 PM
picture 01 is of shinys current (ex) stock
Picture 02 is an aardvark stock built for riot van
picture 03 is the new 'turbo' stock

plate is 8mm thick.
Title: Re: Rudder stock flange.
Post by: JP233 on August 27, 2015, 07:09:49 PM
It so big, it has to go in another post.
Title: Re: Rudder stock flange.
Post by: RobinJones on August 27, 2015, 08:02:44 PM
That fillet on the turbo foil (whats it made of?) looks to have about 15mm overlap onto the flange?

I'd trim it to that, leaving a smooth curve on the trailing edge, and obviously plenty of area around the gudgeon hole on the front edge - based purely on what i have before me, all my stocks have greater than 10mm material all the way around the gudgeon hole.

Though there are far wiser people than me on here, but I'd suppose the 15mm material all the way round with that thickness of plate would be sufficient, just avoid any sharp corners.
Title: Re: Rudder stock flange.
Post by: HighwaytoHelm on August 27, 2015, 10:57:10 PM
Quote from: JP233 on August 27, 2015, 07:09:49 PM
It so big, it has to go in another post.

Do you hear that often jamie?
Title: Re: Rudder stock flange.
Post by: JP233 on August 27, 2015, 11:07:08 PM
Quote from: HighwaytoHelm on August 27, 2015, 10:57:10 PM
Quote from: JP233 on August 27, 2015, 07:09:49 PM
It so big, it has to go in another post.

Do you hear that often jamie?

you did see me in that suit, yes?
Title: Re: Rudder stock flange.
Post by: Tim Noyce on August 28, 2015, 07:36:40 AM
Sand the bog fillet, laminate over it. Then trim it all off flush at the base of the fillet all the way round. (apart from at the front where you probably want more to put the hole in it).