H-20 Miracle specs

My H20 specs. are as follows.

Length 19 ft. 2 1/2

Mast Length. From the place where the main would hang from on the top of the mast to the top of the front beam.

30 ft. 10 1/2

.

The mast top to bottom is 31 ft. 3 3/4

.

I beleive the first mast measurement is how we should measure masts.

Front beam which is the widest point on my boat is 8 ft. 6

exactly. I measured the rear beam and it is 8 ft. 4" which makes sence since the hull tapers down as it comes back.

If someone could explain an accurate way to measure my main and jib I would gladly go measure it.

Mike Hill

H20 #791

The Texel website has a diagram to calculate sail size

Go to:

http://www.texelrating.knwv.nl/

Click on

Description & Calculation

It's about 1/2 way down

Mike ther are a few things you should know when mearuring you sails. I will write them down here.

First a pictures of the mainsail

The methode boils down to this :

-1- you lay the sail flat on the floor with the battens in the pockets but without tension. You tension the sail just enough to take the creases out and pin (nail) it down like that. (In the way that the sail spans the biggest area.)

-2- you hamer a few nails around the sail on the drawn places.

-3- you measure the identified sides of the triangles. INCLUDING the very small triangles that span the space between the sail and the nails used for measureing.

-4- You calculate the total area of the sail by calculating the area of each triangle and adding them up where ofcourse the small traingles outside the sail near the nails are subtracted.

REMEMBER to calculate; Triangles with only straight sides by 0,5 *base* height (where base and height are perpendicular to each other) And

triangles

with a curved side by using the formula 2/3 * base * height. (where base and height are perpendicular to each other)

Measureing the jib works the same (go for the picture to the Texel site)

When you present the rsult please give two area's. I'm not sure wether the Hobie 20 has a large flap underthe mainsail but this area can be substantial but is also found to hardly produce any sailforce. So when comparing mainsails I would suggest that only teh area above the lowest batten is taken in cosideration, So give teh area without the flap and with the flap.

If you have more questions about this measurement methode please mail me or one of the Texel officials (mail adresses found on the Texelrating site www.texelrating.knwv.nl)

Good luck

Wouter

I'm a little confused. I have the basics down but here are a few questions.

Meetpunt's: Why would they be outside the area of the sail? I was assuming I would use the Head tack and clew corners as my meetpunts. So I don't understand the picture that has the meetpunt outside a rounded corner. Of course I don't have any rounded corners on my sail.

Second question: Is the point where S7 and S8 meet always at the end of the first batten? And is the point where S4 and S6 meet always at the end of the second batten? Or do you try to move these points to try to make it look more like the picture?

Would I use a big old square to try to get the H1, H2, H3, and H4? What are the tools commonly used by the pros to measure these sails. Just give me a rundown on the toolkit that would be helpful.

In answer to your bottom area question, we don't have a bottom batten. We just have the boom. Mostly boomless rigs have this bottom area. The only one I can think of is the N6.0. Does the 5.8 also have this bottom flap? I can't remember. I also beleive that we should measure sail area period. They can put it wherever they want. I'd bet the 6.0 would adapt a boom rig with all the sailarea uptop like conventional rigs. However they can do what they want as long as it is smaller than the max sail area allowed.

Mike Hill

H20 #791

For the Chute?

Is the sail area RSAS, MSAS, or RSAS + MSAS?

Thanks,

Mike Hill

I think it is neither of all. The genaker is calculated via it's own formula which can be found on the Texel site and F18 / iF20/ F16 HP rules. This measurement is NOT equal to actual area, but a rough approximation of it.

I don't have the formula with me now. Maybe Carl can copy paste it from the F16 rules.

Wouter

>>Meetpunt's: Why would they be outside the area of the sail?

To provide easy measurements on rounded sails and because when you use firmly fixed nails you can tension the measuring tape and get truelly accurate results. Not really that important for your approximate measurement. Just make sure you use teh same spot as a reference point.

>>I was assuming I would use the Head tack and clew corners as my meetpunts.

By all measn use them as Measurementpoints (literally translated meetpunt) , the math will ensure that you will arrive at the sail area.

>So I don't understand the picture that has the meetpunt outside a rounded corner. Of course I don't have any rounded corners on my sail.

Actually the math is such that it doesn't really matter much where the meetpunt is. Just place it where is convenient in measureing. Don't forget to substract the little triangles that fall outside the sail.

>>Second question: Is the point where S7 and S8 meet always at the end of the first batten? And is the point where S4 and S6 meet always at the end of the second batten? Or do you try to move these points to try to make it look more like the picture?

No I would just the general ratios. the lines drawndevide the sail in 1/5 part realtive to luff length. I would take the batten end approximated by these devisions. As long as it roughly looks like in the picture you do alright the math will take care of most differences in measuring.

>>Would I use a big old square to try to get the H1, H2, H3, and H4? What are the tools commonly used by the pros to measure these sails. Just give me a rundown on the toolkit that would be helpful.

I'm not a measurer myself but that is what I would do. For a full breakdown of the toolbox mail to geert Ruesink he is a Texel official : g.ruesink@hccnet.nl or Nico Boon himself at Nboon@hetnet.nl

They are both Texel officials and were very helpful to me.

Good luck,

Wouter