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Predicting Wing Lift Loads, PBY-6A from Accelerometer Measurements

With the loan, through the eourtesy of the Office of Naval Research, 
Of PBY—6A aircraft project for measurement and 
Invegttgatlon of atmospheric turbulence und convection, numerouz 
problems have arisen concerning the use of thie airplane az a 
meteorologleal tool and eoncerning Instrumentation. These 
problems center around the detection of atmospherie motiona, euch 
az drafte and gusts, from an extended object which is Itself in 
motion the Much 0 oneørnlng aero— 
and e truetural characteristiee of the aircraft itself 
hau been needed in order to interpret ably the readlnge of 
the meteorologieal instruments that are mounted on and it. 
Por these purposes a eon•uliing engineer, Given A. Bre•er, ha• 
been retained by the pro pre •ent report consti tute• 
the results of one of tho very essential studies of the aircraft 
made by him.

The study of gust distribution and eharaeter18tiog In tho atmos— 
phere 18 of importance in both or the separate field' of aero— 
nautic. and meteorology. To utilize properly an airplane for 
air sounding ml "Ion. It is necessary to Ins tmment the Alrplanø 
eo that the gut forces acting upon the aircraft may be determined 
by out table inztrumentß within the fuselage. The most convenient 
method for determialng VI ng loade through the use uf a 
fuselage accelerometer end assoel•tlng recording apparatus. 
Shifting •pan—vise lift distribution In aecelerated flight, 'Ing 
over—travel, flexibility of the accelerometer supports, and fuse— 
lage rotation ail create false accelerationg at the Instrument. 
A test; progræn oarrlod out to the correlation be— 
Ween 'Ing loads and aceølerome ter measurements on the PBY—6A 
airplane. Wing lift loads of the rcraft vere determined by 
moans Of electric gaugen on the lift; vhile 
electric eccelerometøra faatenad vi thin the funelage vero used 
to record Onal And rotational acceleration. 
The florn at various angles Of attack In 
and observations made of 1 if t strut A 
flight In vhleh the put a mmber 
eonprl •Ing chandellen and pull—outs at high speed 
•eoeierated loadings upon •Ing. Readings of 
steady 
•eeona 
Of maneuvera 
made Impo•lng 
strut 8 train