AOPA Pilot Magazine - March 1958 - (Page 57)

moisturn tends to increase bride atrmgkh and weight of undoped f&r.k The strength of fabric dried o& by impropm storage may aometimw be reahred by leaving it in a p h where t humidity is sufficient. h Dope? on the other b d , doesn't give a hoot about moisture? but i8 extremely sensitive t changes i t e m p ~ a h w e . ~ a n Gold makes it britkle and hard Xeat makes it a d t and ductile. Skudies conduck& br the CAA T ~ h i c d Devdopment and Evaluation h h r at Indiana~&, h d * ?have proved that gwd fabric covered with brittle dope will show s u c W v e fdure-'%tst by cracking of the dope, and finally by breding of the fabric." To complicute the testing problem mare, the study ahow6 that the combination of plastic and M e ~ doped I I fabric does not permit a ~ p l addie tion of the valne~of the propertha of the aepaxatx mahiah. Dopa and fabric act -h te M give the &in ib rewired mrvim a~~ One of the d n reasom for doping b t put a prohcthe seal over the cloth? a era of New York City?poinb out that ECSTASY in ETCHING The exciting new ADVENTURE IN ADVERTISING . your product, building or frudernark, pemanently etched .. . a n everendurin~ vinyl .. . "If it will PHOTQGRAPI-L ; will t PERMA ETCH" - atem from them facts: I Tempmature and humidity condi. tiens affecting fabric atrengkh are not controlled. One of the moat p p u h field testma 2, The test m y not be @ o d i i s the Seybth tesbr which ahow the n a way ka p m d w the ma& accurate r! e- amount of re&tance a doped fabric tion against a m a puncher. As sulb & which the w r h-capable, When t o or more fldd bt.~the the punch e w on n the fabric, r & e~ =me fabric show &Ear& remlta, here of t ?thmads causes a pist~nin the the are some of the t h i m which rn h btmr i~ be pushed up. The dkkr~ce responsible: pktm is q m e d increaaea with the Even a *pie fxsting drmice c d l s f ~ r fabric sken&. a s&hd testing In the W m h i w n officm of the CAA, there i~ a tension-ty~eWd h t e r which r e quires that a earn& be cut from the p h , s b i p p d of dope and ~ u b j b d pull. R w l Q will be WmYneoUs, however, if the mahrid i~ cat t t not ob m m m width md properly wcwed iQ the b3frkr'~ grip. A h m n a s o thh f test will be affwted by the dightast residue of dope on the sample, CAA SWL Ein Washinghu m y samp ham been h o r n b b t 20 m a & l a gma*r than thw would have had tbe fabric hen p q e r l y drippd. Thh i s the kind of error WE&a n a 4 y occur i the field. n Such a ample might have been subjected to a punch tmt and f d d . Y it & wmld appear h have p d t pull b test b m w a the dope residue did in fact Puw cam ~~ c a m a false reading. Another rwmn for hco-t test resdta ia that airerdt wv* can vary in skength o w its d a c e . Deteriorated and good cloth often exid side by aide. Wealmess may be =used by flaws or cracks in the dqm where mohture has enkred, or by m d posure t smshina Mewncm in ml- ~ 0 r k On d8Vd0pm-t of a fidd h 8 k o ored pigment may also permit one area of the impact type. This device canMARCH, 1958 83fH Mmcbesier Ave., St, Louis 17, Mo. A d m k h g SF-* At- C~~ the M d o a

Table of Contents for the Digital Edition of AOPA Pilot Magazine - March 1958

AOPA Pilot Magazine - March 1958
Contents
Calendar
Legally Speaking
Editorial
What About Airspace Use, Mr. Pyle?
10,000 Seconds Under the Hood
Flying Weather One Month Ahead
AOPA Weathercast
AOPA 185579
Air-Age Teenagers Give City a Lift
Your Radio and You
Operation Cost Cut
Put Your Fabric to the Test
Are You "Compasss Punchy?
Yankee Duster in Latin America
South American Challenge
I Lived Through a Graveyard Spiral
Safety Corner and Accident Report
On the Airways
Travel
What's New?
Classified Department

AOPA Pilot Magazine - March 1958

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