UK-Cherub Forum

Cherub Chat => Tech Chat => Topic started by: ross_burkin on March 26, 2008, 10:11:35 PM

Title: Rudder gantry
Post by: ross_burkin on March 26, 2008, 10:11:35 PM

What do they do exactly? Talking pre T-foils hear. The only thing I can think of is that they keep most of the tiller out of the boat giving the helm more room.

Title: Re: Rudder gantry
Post by: Stuart Hopson on March 26, 2008, 10:54:04 PM

Surely if that was the case you would have a shorter tiller  ???

Title: Re: Rudder gantry
Post by: Will_Lee on March 27, 2008, 07:38:23 AM

Basically that's it: Ergonomics. With the single wire boats especially.

Title: Re: Rudder gantry
Post by: tim_unerman on March 27, 2008, 08:42:35 AM

I think it can sometimes help with balance as  the rudder contributes towards the center of lateral resistance.

Title: Re: Rudder gantry
Post by: Phil Alderson on March 27, 2008, 08:53:50 AM

It is largely ergonomics, giving you more space in the boat. Also you are increasing the distance between the CB and the rudder which gives the rudder more authority and the boat less twitchy. This is more important on boats that have the CB quite far back.

I almost expect gantries to get shorter and shorter now with the use of the T-foil as it gets the lift more under the boat.

On another note does anyone want a solid purple gantry. I removed one from Primal when I rebuilt and it is on its way to the skip at the moment.

Title: Re: Rudder gantry
Post by: ross_burkin on March 27, 2008, 09:32:41 AM

Maybe me! If its worth adding one to FS and it's not to heavy...

Title: Re: Rudder gantry
Post by: ghislain_devouthon on March 27, 2008, 09:35:01 AM

That's funny, I was thinking the gantry would become longer with the T-foil  :-X.

Actually by moving back the gantry and the T-Foil you increase the lever.

Title: Re: Rudder gantry
Post by: phil_kirk on March 27, 2008, 01:12:38 PM

As i understand it moving the rudder back and mounting it on a gantry allows
1) more space for the helm and crew in the cockpit
2) more leverage and less twitchness due to the increased distance between the CB and rudder
3) the helm to get back over the transom without the angle of the tiller and extension becoming to small( making steering twitchy again).

with the t foil you want to get the helm's weight over the foil otherwise the boat will become quite nosey.
so the gantry wants to be shorter to support more of the weight of the boat and the helm.