Page:Dictionary of aviation.djvu/132

 108 DICTIONARY OF AVIATION

ged nimbus; irregular fragments or patches of cloud torn from, or floating below, a nimbus or rain^cloud ; scud.

fracto-stratus /fssekto'stjee-tas n. [plural fractOfstrati] ir- regular fragments or edges of stjatus cloud.

frame fseem n. a structure which servs as a support or skel- eton; the rigid main part of an airship or flyer, to uhich other parts, such as the motor and passenger^accemmo- dations, are attacht; the framework.

frame-member 'fseen^membaz n. one of the members or parts of the frame of a kite; a frame-stick.

frame-stick 'fseem,stik n. one of the sticks or reds forming the frame of a kite; a frame-member.

framework 'fseem/weizk n. a structure which constitutes a frame or rigid portion in an airship, flyer, or kite; the frame.

freedom 'fsii-dam n. the property of being free to move in a tganslatory or rotary manner in one or more directions or about one or more axes; capacity for unrestjaind flight or aerial movement : as, the degrees of *freedom of an aerodone. '

free-flight 'fsi^ftait adj. characterized by free flight; re- lated to unrestgaind or unhinderd flight : as, *free^flight models; the *free?flight method of experiment, see under flight.

freshen 'fse$an intr. become fresher or stronger; increase in velocity : as, the breeze *freshens.

friction 'fsik$9n n. the resistance which any body meets with in moving over the surface of another.

internal friction of a fluid, the friction inside of a mass of fluid due to the relativ motions of the particles; vis- cosity.

skin friction, see skimfriction.

friction-plane 'f5ik$9ii,pLeen n. an aeroplane or plane aero- foil used 'in determining the skin^friction generated by the motion of an aerofoil thru the air.

frontage 'fsAntids n. the spred, or tip-to-tip width (of an aeroplane or flyer).

frost fse:st n.

1. the act or state of freezing or becoming frozen; the temperature of the atmosfere when below the freezing-point of water.

black frost, frost not accompanied by hoar or rime : dis- tinguisht from white frost.

2. frozen dew or vapor; hoar; rime; hoarfrost; luhite frost.

frost-bite 'f5e:st,bait n. the inflamed or gangrenous con-

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