Hydrofoils are generally prohibitively more expensive than conventional watercraft.

Hydrofoils of this type are known as surface-piercing since portions of the U-shape hydrofoils will rise above the water surface when foilborne.

* Hydrofoils are regularly operated on the three major Italian Lakes by branches of Ministry Of Transportation: Navigazione Lago Maggiore services routes on the Lake Maggiore between Locarno and Arona, Navigazione Lago di Como services routes on the Lake Como and Navigazione Lago di Garda services routes on the Lake Garda.

* Hydrofoils are sensitive to impacts with floating objects and marine animals.

* Hydrofoils are expensive to build.

Hydrofoils have less water resistance at the highest speeds just obtainable by humans and are thus usually faster than displacement boats on short courses.

Ferries reach Ponza from Naples, Terracina, Formia and Anzio ; there are also Hydrofoils ( aliscafo ) from Anzio and Formia that have travel time of about 75 minutes.

Commercial use of hydrofoils in the U. S. first appeared in 1961 when two commuter vessels were commissioned by Harry Gale Nye, Jr .' s North American Hydrofoils to service the route from Atlantic Highlands, New Jersey to the financial district of Lower Manhattan.

Hydrofoils can be artificial, such as the rudder or keel on a boat, the diving planes on a submarine, a surfboard fin, or occur naturally, as with fish fins, the flippers of aquatic mammals, the wings of swimming seabirds, or other creatures like the sand dollar.

Hydrofoils had their peak in popularity in the 1960s and 70s.

The Catamaran Dodekanissos Express and the Hydrofoils ( only during the summer ) connect Leros with most of the Dodecanese islands.

Hydrofoils require significant speeds to work, but once the hull is lifted out of the water, the drag is significantly reduced.

An earlier but still influential school of painting, surrealism, had suggested the way of dealing with the dream experience, that event in which seemingly incongruous objects are linked together through the curious associations of the subconscious.

We are desperately in the need of such invention, for man is still very much at the mercy of man.

Our collective policies, group and national, are similarly based on voodoo, but here we often lack even the empirically successful rituals and are still engaged in determing them.

Even in domains where detailed and predictive understanding is still lacking, but where some explanations are possible, as with lightning and weather and earthquakes, the appropriate kind of human action has been more adequately indicated.

These my grandmother left in their places ( they are still there, more persistent and longer-lived than the generations of man ) and planted others like them, that flourished without careful tending.

`` I care not how soon we reach Calcutta, and are placed in a still room, with a bowl of milk and a loaf of Indian bread.

You are still in France ''.

The curving benches are broken, chipped, tumbled, but still in place, as are the marble chairs, the seats of honor for the legislators.

To the extent that our sampling of the orientations of American college students in the years 1950 and 1952 may be representative of our culture -- and still valid in 1959 -- we are disposed to question the summary characterization of the current generation as silent, beat, apathetic, or as a mass of other-directed conformists who are guided solely by social radar without benefit of inner gyroscopes.

And although they were, as I have indicated, under increasing strain at the time of Racine, they are still alive in his theatre.

But in ways more fundamental than specific political opinions they are still what they always were: passionate, sure without a shadow of doubt of whatever it is that they are sure of, capable of seeing black and white only and, therefore, committed to the logical extreme of whatever it is they are temporarily committed to.

If we are to believe the list of titles printed in Malraux's latest book, La Metamorphose Des Dieux, Vol. 1 ( ( 1957 ), he is still engaged in writing a large novel under his original title.

But while war still serves as a catalyst for the values that Malraux wishes to express, these values are no longer linked with the triumph or defeat of any cause -- whether that of an individual assertion of the will-to-power, or a collective attempt to escape from the humiliation of oppression -- as their necessary condition.

But in so many other areas we still are dragging.

( Significantly, bitter echoes of the 1960 power struggle that saw Mosk moving into the national committee post over Ziffren are still audible in party circles.

However, there are still several types of calls that necessitate the use of telephone operators.

How can we old-fashioned parents, who still feel that adults are due some respect from children, battle the new type of advertising that appears on TV without denying the children the use of television entirely??

structurally, the U.N. is still fluid, vulnerable to the pressures that its new and enlarged membership are bringing to bear upon it.

As Critic Walter Kerr points out: `` Adaptations, so long as they are good, still qualify as creative ''.

and it is still very far from certain how valid the party's claim is that in `` a growing number of kolkhozes '' the peasants are finding it more profitable, to surrender their private plots to the kolkhoz and to let the latter be turned into something increasingly like a state farm.

`` the matters to be considered are obviously of a grave character, and I therefore respectfully request that the hearing be postponed for two weeks in order that I might make adequate preparation ''.

After allowing for group exposures, it is apparent that other factors must be considered if we are to comprehend fanaticism.

Orange and lemon are considered important as are such pastels as blue and lilac.

Two cities to be considered, Providence and Cranston, are an enigma.

But there are other contentions which might be considered more difficult.

These strengths are considered adequate to meet the essential roles and missions of the reserves in support of our national security objectives.

These men are considered managers of engineers.

To some extent the system can be considered a Gemeinschaft in which `` social-role occupancies are determined by birth, by attributes such as sex or caste, which are biologically or socially immutable ''.

They are still considered to be for use in restricted waters, however, and targets must come within a few yards of them.

Such cases are not considered here.

The input light distributions considered are P-11 and P-20 phosphor emission and the so-called `` night light '' ( N.L. ) as given by H.W. Babcock and J. J. Johnson.

When the frequency response characteristics of practical components are considered, their effect on stability does not present the most serious limit on the system loop gain.

These are substantially the same factors considered by Non-Catholics in family planning.

What determines the morality, they state, is not the means used, but the motive In general, the means ( excluding abortion ) that prove most effective are considered the most ethical.

It seems to be indispensable to the national self-esteem that the Negro be considered either as a kind of ward ( in which case we are told how many Negroes, comparatively, bought Cadillacs last year and how few, comparatively, were lynched ), or as a victim ( in which case we are promised that he will never vote in our assemblies or go to school with our kids ).

It is simply that in Taoist tradition -- as in all good mysticisms -- books, words, or any other manifestations that belong to the normal state of consciousness are considered only the surface of experience.

about 30 per cent call themselves Christians in order to keep up appearances and be considered respectable, and only the last 10 per cent are genuine Christians and believers in democracy.

`` Of course ( George's letter continued ), there are practical problems to be considered.

E. B. Tylor ( 2 October 1832 – 2 January 1917 ) and James George Frazer ( 1 January 1854 – 7 May 1941 ) are generally considered the antecedents to modern social anthropology in Britain.

Phylogenetic analyses place these genera into the following groups ( not all of these are considered amoeboid ( or " amoebas ") by all sources ):

ASCII includes definitions for 128 characters: 33 are non-printing control characters ( many now obsolete ) that affect how text and space is processed and 95 printable characters, including the space ( which is considered an invisible graphic ).

All modern amphibians are included in the subclass Lissamphibia, superorder Salientia, which is usually considered a clade, a group of species that have evolved from a common ancestor.