Newsgroup: it.sport.windsurf
Titolo: IMCS??

CIAO A TUCH!!!!
non sono molto bravo con gli acronimi....quindi vi chiedo cosa vuole dire
albero imcs.
č un tipo di albero superato?
perchč chi sa sa e chi non sa chiede!!!
grazie e CIAO BELLI
-- 
questo articolo e` stato inviato via web dal servizio gratuito 
http://www.newsland.it/news
 segnala gli abusi ad 
ab...@newsland.it

IMCS = Index Mast Check System
e' l'indice di rigidita' dell'albero. Ogni albero (a seconda della
lunghezza) ha un IMCS diverso
Tutti gli alberi moderni sono classificati per il loro IMCS

IMCS e' l'indice di rigidita' dell'albero. Ad eccezione degli alberi
molto lunghi (dove si possono trovare IMCS diversi per alberi della
stessa lunghezza), per gli alberi moderni c'e' praticamente una
corrispondenza univoca lunghezza-IMCS.
In base alle vela che hai per le mani, ti sara' richiesto di montare
un albero con una particolare lunghezza e IMCS.
Davide

 grazie e CIAO BELLI
Questa che segue e' secondo me la spiegazione migliore e piu'
dettagliata che si possa scrivere ...
MCS / IMCS MAST MEASUREMENT SYSTEMS
MCS
The MCS (Mast Check System) allows comparison of stiffness and flex
between masts by measuring the deflection under a fixed load at points
along the mast. As the stiffness of a cylindrical mast section is
proportional to the fourth power of the diameter, slight variations in
taper, wall thickness and materials have a great effect on the mast's
behavior. Since windsurfing masts are developed by individual
manufacturers in a variety of stiffness and flex, the MCS system is
useful in determining mast / sail compatibility. In the MCS system,
the 'character' of the mast is described by a dimensionless stiffness
coefficient and base - tip flex percentages.
How to Make an MCS Measurement
1) Place the mast on two low-friction pins located 5cm in from each
end.
2) Determine the mid-point and the 1/4 points between the pins.
3) Hang a weight of 30 kilos (66 pounds) at the mid point and measure
the deflection at the mid and 1/4 points.
Hints:
1) You may want to use a small (2-5 pound) weight to preload the mast
slightly and eliminate slop in the joint or other minor variations.
This weight must be placed in the middle and remain in place for all
measurements.
2) To determine the deflections, take differences from the undeflected
(no 30 kilos) and deflected (with 30 kilos) positions at the top edge
of the mast.
3) Strap the butt-end to it's pin while still allowing for rotation to
prevent the mast from moving back and forth on the pins and possibly
falling off.
To determine the stiffness and flex, enter the data into the following
formulas:
MCS = (Length x 10 ) / Mid def(cm)
Base % = (1/4 def ) / Mid def
Tip % = (3/4 def) / Mid def
Mast Categories
Under the MCS system most popular windsurfing masts found in the
marketplace can be placed into three basic categories:
Constant Curve
Any mast with a base - tip percent of mid-point difference in the 10%
- 14% range is considered to be a 'constant curve' mast. The 'classic'
definition of a constant curve mast is a mast having a 76% tip
defelection percentage and a 64% base deflection percentage. These
masts are often labeled as 12% constant curve masts.
Flex Top
Any mast with a base - tip percent of mid-point difference in the 18%
- 22% range is considered to be a 'flex top' mast. The 'classic'
definition of a flex top mast is a mast having a 82% tip defelection
percentage and a 62% base deflection percentage. These masts are often
labeled as 20% flex top masts.
Combi Curve
Any mast with a base - tip percent of mid-point difference in the 14%
- 18% range is considered to be a 'combi curve' mast. The 'classic'
definition of a combi curve mast is a mast having a 79% tip
defelection percentage and a 63% base deflection percentage. These
masts are often labeled as 16% combi curve masts.
IMCS (INDEXED MAST CHECK SYSTEM)
Windsurfing masts are developed by individual manufacturers in a
variety of lengths as well as stiffnesses. As the defection under load
varies with length it is necessary to account for the length factor
when selecting a mast. The IMCS system 'normalizes' the MCS stiffness
coefficients to a standard length mast which then allows direct
comparison of masts. Currently, IMCS is the standard by which all
windsurfing masts are categorized. Once an MCS measurement is made,
the IMCS is determined as follows:
Converting MCS to IMCS
IMCS = (MCS x (Length)2) / (460)2
The chart below gives the conversion for most popular masts currently
in existence.
MCS - IMCS
400 - 25 - 18,9
430 - 25 - 21,8
430 - 27 - 23,6
460 - 25 - 25,0
460 - 27 - 27,0
480 - 27 - 29,4
480 - 30 - 32,7
500 - 28 - 33,1
500 - 30 - 35,4

 Converting MCS to IMCS



