Tigs. 20,21,22. IT.A.C.A. Technical Memorandum No. 745. … Figure 20.- Two-engine Bbeing-247 transport plane* Note the clean engine installation; the wheels retract partways in the wing. Figure 21.- Two-engine Douglas "Airliner1'; largest twin*-engine transport plane. The wheels are fully retracted. Figure 22.- Lockiieed "Electra? the fastest airplane of…
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