## R/C Sailboat

I want to make a R/C sailboat, so far I have 4x32x1/4 inch balsa wood planks and they should last me the entire project. This weekend I'm going to visit a hobby store and get: waterproof wood glue, waterproofer for the wood. Then go to target and get a rotary tool.
The boat will be 3 inches tall with a 1 inch keel (keeps the boat from tipping) 5 inches wide and 15 inches tall.
I will get a cheap multi directional R/C car and use the steering mechanism to move the rudder and the drive motor to turn the sail.
Once I make the boat I'll fill the gaps with wood paste and water proof everything hopefuly with a silicon based sealant.
Any tips or flaws with my plans, please see the attached sketch.

floatingabout the Internet.Cheers,

Pat. Pending

Based on your drawing, you can easily find the 3D coordinates (height, width, length) for each point of the triangles. Now simply use the 3D distance formula:

D = sqr root( (x1-x2)

^{2}+ (y1-y2)^{2}+ (z1-z2)^{2})Find the length of all three sides (of each triangle.) You now have the exact dimensions of your section.

Draw one side of the triangle, and use a compass set to the length of the 2nd and 3rd sides--draw each one from the endpoints of the first side. The arcs cross at the third point ...

x -- width (from center)

y -- height (from baseline)

z -- length (along baseline from bow)

(these are arbitrary, whatever dimension convention you choose, be consistent.)

point defined as -- pX(x, y, z)

For the

garboard(lowest plank) triangle section of the bow, thebow stemlength (thestemis the front of the boat that 'cuts' into the water):p1 (0.0, 3.0, 0.0) (foremost point at bow--all the bow triangles will share this point)

p2 (0.0, 0.0, 3.5) (low point of the stem)

p3 (1.0, 0.5, 3.5) (the point off the center)

Distance(p1, p2) = ~

4.60977= sqr root( (0.0 - 0.0)^{2}+ (3.0 - 0.0)^{2}+ (0.0 - 3.5)^{2}) )(For the

lining offtechniques I mentioned, you'd need to change your drawing somewhat. With the distance formula, you can use your existing drawing.). Hmmmmm. Not sure. Looks to me like it half-a-cone, so I think you can use the same formulas that welders use to build "cones" from pieces of plate. Pyramid calcs might work. A 3-D modeling program might help (check http://www.sourceforge.net/).

yachetsdo but most models don't. There's bunch of guys who sail there boats at our park's pond every Saturday, and whatched them a few times, there pretty cool. RC cars don't usually have rack-and-pinion steering. They use a servo[] witch has a little arm hing that goes back and forth. If you use string to rig all of this up correctly, you will be able to make both the sail and rudder turn.:-)