Hi Pete,
NZL-20 still in stand-by since removal. Searching for a new lab !!
By memory real AC:
Loa 24mt
Lwl 19mt
Dspl 24T
Bulb 20T
You ca deduct the rest.
Real scale produce a very low DSPL and some time impossible to construct the model. i.e. AC120
scale factor 1:20
Model Dspl = real Dspl /20x20x20 = 24000kg / 8000 = 3kg
Assume a bulb of 20000kg /8000 = 2.5kg tghis give a margin of 0.5kg to build the full boat = mission impossible !!!
Of course it is not necessary at model level to use a ratio between boat and bulb of 83%
70% is necessary to warrant good stability of the model, therefore 3000 x 70% = 2.1kg in the bulb and 0.8kg for the construction = again mission impossible !!.
Thank you Claudio, Great information , NZL-20 is a beautifull Boat. In the first set of drawings you have for her , you show the tandem Keel with a wider beam , Do you have a drawing of the frame’s to go with it ? I may consider building her instead
Hi,
Alan and I we have disregarded the model with twin fin for two reasons, AC120 Rules observation and not sure that will work at model level… who knows anyhow !!
Best regards,
CD
Hi Peter,
to complicate your choice, eheheh ! I noticed that there is another model the “Areva” that collected various excellents results at National regattas. See plans and pictures at :
Thank you Claudio, I am thinking that I am leaning toward BMW ORACLE , I have a question I was looking over the plans that I got from Renato Chiesa site , it does not give me the frame spacing , is it the same as set up as NZL-20
Hi Claudio, There is a lake by my house ( open waters )where I sailed my Herreshoff Buzzards Bay 14 ( no Radio ) she ‘s built at 3/4" = 1’ - 0 " the other spot is a man made pond . that is where people with RC boats sail.( close waters ) average wind speed is 5 to 17 knots. I talked with a few people that sail there and the largest boat is 36" (914.4 mm ) they had never heard of the IACC 120 Class . Most of those boats are plastic kits . could one of your boats be scaled down to that size ? and still give the same performance ? I completed the Herreshoff at the beginning of the month (july ) here are a few photos of her on her maiden voyage
Hi,
by average I was intending how many days a years the wind is blowing at 7kt and how many days a years is blowing at 17kt.
Below 8-9kt it is possible to choose the more efficient CP.
Actually my models are designed around a CP of about 0.58. Probably a CP of 0.54/0.55 would be better below 8kt wind speed !
About classes, other then the AC120 I developed in 2007/2009 does exist already the AC100 that is just 1mt long that I designed in June 2009. Several drawings are available in the Amon site I passed to you before. A non skilled modeler should not choose the AC100A since the displacement is too low to allow an easy construction. in 2010 I designed the AC100-B that is somewhat easier with composites materials, AC100-D and AC100-U are for wooden veneer construction.
these films where taken at 3/5kt for my first AC100B
Hi Claudio, After watching the Videos, the wind speed in them looks to be about the same wind speed as around here. I will look into the AC100 Boats , I thought I had this all figured out , Now I will re think this . I did enjoy watching them sail