Rudder placement on hydroplane design

Anything related to Raingutter Regatta racing and event coordination.
Post Reply
jlcrowley
Apprentice
Apprentice
Posts: 1
Joined: Sun Nov 09, 2008 12:48 pm
Location: Holmdel, New Jersey

Rudder placement on hydroplane design

Post by jlcrowley » Sun Nov 09, 2008 2:33 pm

Hi,

I have found a design for a hydroplane using the standard BSA kit on the web. I followed the design - but I need to use all the parts in the kit. Plan says to cut a slot in the hull 1.5" from the stern and insert the keel as a rudder. Bit I don't know if that means the front of the slot is 1.5" from the stern, or the middle, or what.

If the front of the slot is 1.5" from the stern, the hull, the end of the keel/rudder is flush with the stern.

Can anyone advise as to correct placement?



Teeeman
Pine Head Legend
Pine Head Legend
Posts: 1581
Joined: Fri Apr 01, 2005 2:40 pm
Location: Huntsville, AL
Contact:

Re: Rudder placement on hydroplane design

Post by Teeeman » Tue Nov 11, 2008 2:15 pm

sounds like you have the right interpretation, but how heavy is the keel?

If it makes the boat's nose really light... could be good or bad...

suggest testing it...

go with the best location :)

-T


"I dunno..." - Uncle Eddie, Christmas Vacation

BlackLotus
Master Pine Head
Master Pine Head
Posts: 122
Joined: Tue Jan 15, 2008 10:02 am
Location: Boonies, Nevada

Re: Rudder placement on hydroplane design

Post by BlackLotus » Fri Nov 14, 2008 6:50 pm

If you must use all parts, I would probably grind it as thin as possible (or drill holes in it to reduce weight), reshape it a little and use it as a spar to conect the pontoons. I would then use the rudder supplied in the kit attached into the rear spar and watch my boy speed down the gutter.



rdlongsc
Apprentice
Apprentice
Posts: 13
Joined: Wed Sep 19, 2007 3:45 pm
Location: Richmond, VA

Re: Rudder placement on hydroplane design

Post by rdlongsc » Sun Nov 23, 2008 10:06 am

Our pack also requires using all parts in the kit. Gluing the rudder flat on the top of the hull or bottom of the trampoline has become a favorite way of meeting this requirement, especially on the catamarans, which don't need it. It becomes a "decoration" :lol: .



boss429
Pine Head
Pine Head
Posts: 50
Joined: Tue Jan 27, 2009 12:07 pm
Location: Houston, TX

Re: Rudder placement on hydroplane design

Post by boss429 » Thu Feb 19, 2009 4:20 pm

You can glue the metal "keel" on top near the back as a weight to balance the boat to push the nose out of the water. You don't need the weight underneath, the boat won't capsize.

Use the plastic "rudder" for the keel/rudder again under the back of the boat.

The hydroplane design is meant to keep the nose out of the water and minimize the amount of hull that rides below the waterline.

When you blow into the sail the boat has a tendency to tip forward so use the weight to balance the boat accordingly.



Post Reply