Irens A-65

PIL66 - XL2

Super Anarchist
2,682
737
Stralya
How much did you just add to XL2? Do you think she's be slower with another 10' added in the middle?
XL2 is on the boarder of max width for length.... to the point where it is way more likely to pitchpoll than capsize.....
Sailing A narrow 14-16ft version of XL2 in my paddock would be super stressful .... and not on my to own list 

 

[email protected]

Super Anarchist
1,061
426
43 south
XL2 is on the boarder of max width for length.... to the point where it is way more likely to pitchpoll than capsize.....
Sailing A narrow 14-16ft version of XL2 in my paddock would be super stressful .... and not on my to own list 
I'm not talking about reducing beam, but extending length. Keeping all else equal, would she sail better at 50'?

 

Sidecar

…………………………
2,909
1,292
Tasmania
XL2 is on the boarder of max width for length.... to the point where it is way more likely to pitchpoll than capsize.....
Sailing A narrow 14-16ft version of XL2 in my paddock would be super stressful .... and not on my to own list 
I'm not talking about reducing beam, but extending length. Keeping all else equal, would she sail better at 50'?
But it can never be all else equal. Weight would go up for a longer boat.

That said, if you extend LWL of the hulls only without adding any more accommodation, the weight increase isn’t big and the boat should be significantly be faster in medium/heavy winds and slightly slower in light/medium winds.

To fag packet illustrate, using (expired) XL2 data off the current OMR listings:

RL: 11.47, RWeight (no crew): 1120 kg, RSA (Main and jib only): 38.48 m2. Indicative Base (average) Speed: 12.2 knots.

if you extended the hulls to (say) 13 metres and the weight increase was (say) 150 kg, the numbers become:

RL: 13.00, RWeight (no crew): 1270 kg, RSA (Main and jib only): 38.48 m2. Indicative Base (average) Speed: 12.5 knots.

If you were to put XL2 on a diet and save 150 kg in weight, the numbers become:

RL: 11.47, RWeight (no crew): 970 kg, RSA (Main and jib only): 38.48 m2. Indicative Base (average) Speed: 12.6 knots.

And if you put the 150 kg weight saving back as extra  length, the numbers become:

RL: 13.00,  RWeight (no crew): 1120 kg, RSA (Main and jib only): 38.48 m2. Indicative Base (average) Speed: 13.0 knots.

FWIW, OMR doesn’t rate beam, so extra RM gained with beam is free performance.

 
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SeaGul

Super Anarchist
1,346
99
Oslo Norway
To fag packet illustrate, using (expired) XL2 data off the current OMR listings:

RL: 11.47, RWeight (no crew): 1120 kg, RSA (Main and jib only): 38.48 m2. Indicative Base (average) Speed: 12.2 knots.
What?? Is XL2 only 1120kg?? No I think its more around 3200 maybe a little more... 

 

Sidecar

…………………………
2,909
1,292
Tasmania
What?? Is XL2 only 1120kg?? No I think its more around 3200 maybe a little more... 
Apologies. Well spotted. I jumped a row reading across the spreadsheet. The RSA is incorrect as well.

So RL is still 11.47 and Rweight is 3260 kg and RSA is 101.61 m2. Doesn’t change the principle though, Corrected Base (average) Speeds in the same order as above: 12.9 knots, 13.0 knots, 13.6 knots and 13.7 knots respectively.

I thought it was a bit light……

 
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