B-17 Pilots Manual.pdf

to holding the wing level, because the directional stabilityproduces a noticeable turning tendency with onewing down.WARNINGCare should be taken to avoid excessivethe ailerons.(5) ROUGH AIR OPERATION.use ofW The ailerons and rudder can be used withoutconcern regarding excessive loads. It is almost impossibleto damage the system without a deliberateattempt to do so. The forces required are smallenough and the resultant responses large enough tomaintain ample control of the airplane.(Q) In the case of the elevators, however, caremust be exercised to assure smooth operation. Inthunderstorms, squalls, and in or near extremelyturbulent cumulous clouds, it is possible to developexcessive load factors with the elevators unless propercare is exercised.(.0 Operation in rough air should be made onthe basis of holding constant the air speed with theelevator. Corrections for changes in altitude mustbe done with power, and for very rapidly rising aircurrents, it may be necessary to lower the landinggear.(g) The airplane should not be dived through acloud layer or through rough air at the maximumdiving speed, nor should high-speed flight be attemptedin rough air.(6) OBTAINING MAXIMUM PERFORMANCE.(!D The ceiling and climb at 35,000 feet are asgreat or greater than that of many fighter airplanes,but the high speed is not as great as most fighters atnormal altitudes; therefore, in order to outperformany enemy at 35,000 feet it will be necessary to outclimbhim rather than to outdistance him.(Q) The increase of speed obtained by nosingthe airplane down below the horizontal at rated powerand at any high power condition is smaller than thatobtained by fighters.(g) In order to obtain maximum climb, the followingtechnique should be used:1. Maintain the proper climbing air speed(135 mph indicated).~. In any emergency whatever, such as beingpursued by the enemy, engine speed should be increasedto 2500 rpm. The increase in rpm has a veryappreciable effect on increasing propeller efficiencyand rate of climb under conditions of climbing speedand high altitude, and, in addition, is not detrimentalto the engine. The pilot should avoid the use of lessthan 2500 rpm when primarily interested in a highrate of climb at high altitudes.~. 21,300 rpm has been determined to be themaximum operating turbo speed with a 5 percent overspeedallowance in emergencies. This would providean emergency rating of 22,400 rpm. At any altitudegreater than 30,000 feet and at any power obtained inautomatic rich (with 2300 rpm or 2500 rpm, full throttleand turbos set for manifold pressures indicated in thefollowing table), the exhaust gas temperatures aredropping rapidly and it is very unlikely that criticaltemperatures will be approached. The following tentativelydetermined manifold pressures will permitsafe operation of the turbo under the given conditions:Manifold Pressures giving Manifold Pressures givingrated power at 2300 engine military power at 2500 engineAltitude rpm and 21,300 turbo rpm rpm and 21,300 turbo rpmS.L. 39.0 I>,°.....47 in. I""""°I-