The Reader's Digest, Volúmenes17-18Reader's Digest Association, 1930 |
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Página 624
... plane will ascend only 100 feet a minute . This is the " service ceiling " above which it does not pay a commercial operator to fly the plane . After reaching the ' service ceiling , " he keeps right on until the ship refuses to climb ...
... plane will ascend only 100 feet a minute . This is the " service ceiling " above which it does not pay a commercial operator to fly the plane . After reaching the ' service ceiling , " he keeps right on until the ship refuses to climb ...
Página 1044
... plane . When the plane was inclined 18 degrees from the horizontal the leather slid down . At 28 degrees the rubber went coasting . Not until the plane was slanting 42 degrees did the cork creep down . Fascinating applications of cork ...
... plane . When the plane was inclined 18 degrees from the horizontal the leather slid down . At 28 degrees the rubber went coasting . Not until the plane was slanting 42 degrees did the cork creep down . Fascinating applications of cork ...
Página 1081
... plane owners and operators . The automobile industry never reached its present scale by reason of commercial traffic . Millions of private cars use the roads , justifying the ex- pense of maintaining them . Avia- tion needs right now ...
... plane owners and operators . The automobile industry never reached its present scale by reason of commercial traffic . Millions of private cars use the roads , justifying the ex- pense of maintaining them . Avia- tion needs right now ...
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