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14-16, Pedder Street, Hangkong Telephone: 30311
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THE CHINA MAIL, THU
ENGINEERING PAGE BRITAIN, COMMONWEALTH PREPARE FOR BIF 1950
Reverse Power For Aircraft
Bringing down a four-engined" transport at a 404 dograd angle with a forward speed of 190 miles on hour is not the orthodox procedure but a system which takes full advantaga of this procéddie has been" developed by the Propeller Division of the Curtiss-Wright Cor! póration.
Such a rate of decent, it is believed, would com- tribute greatly to the safety of high altitude flying of the aircraft could come down quickly and safely in on emergency.
also
Preparations are now proceeding in Britain did......
the Commonwealth for the 1950: British Jn. dustries Fair, to be hold in the United Kingdóm from May 8 to 19 of next your,
Hong Kong, which impressed greatly with its stand
this year, is again expected to send a delega tion to the. 1950 Fair
national trade
fafr. Only manufactofers whose “goods are produced within the United Kingdoni' 'may exhibit. A Commonwealth section at Earts Court will include reproteḥtative Common- displaya urganised by wealth Goverdinent
could
Improve the is not careful, the engines can be at the Fair in 1980. The most Et operating effelenty of high at-stopped altogether.
itude aircraft by permitting, for with an example, a transport
of cruising altitude virtimum
30,000 feet
In general, the very wide rangó of industries and treden which have diffibited at the" BIF in recent years Mil be refresented
notable extension in 1950 will be the addition of a considérable For this reason, the throttle area fa the open' aly' section" at do arranged that when it is pulled Castle Bromwhis," which__‚will ne
procedure, full reverse' power is applied,
to begin the descent past nocinal' during tho' reversing 'commodato a spectat 'display of
onty 10 a landing when for minutes from the landuly Geld instead of 90 minutes out as al present.
·
G.W. Brady. Curtiss-Wright's chief engines, and H O. Fisher, seat pilot ide the Propeller Divi- zion of Curtiss-Wright, have betti working on this problem since the It was in that year 1843: Curtiss-Wright perfected rever- sible propellers for land aircraft, and the question arose as to what would happen if these propellers inadvertently reversed in sight.
of the Colonel H. M. McCoy
reversing U.S. Army had tried two inboard engines of an experi- mental B-17. His reports showed that the stalling speed rose and the alreran began settling of an accelerated rate.
of fun same time.
Care had beep- taken, however, to ensure they had not exceeded the maximum of 2,700 r.p.m. which was established as the up- per hit for the Pratt & Whitney R-2000 engine.
Overspeeding could result when the propellor momentarily in the zero pitch position, where it is neither subject to a load nor to the regulation extion of the constant speed governor.
The tendency to over-specu'te- old greater as the air speed of the aircraft increases. It was that the found by these tests upper mit 22,700′ г.pm. was reached on the C-54 at an in- dicated afrspeed of 205 miles per hour, The rate of descent, of the C-84 with all propellers roveted is chown in the accompanying alperam together with the cor- respording in for the me aircraft making a conventional emergency descent.
Síned it is improbable that more than two propellers on a four- engined alrerit would reverze at once, no one attempted to go fur- ther than MeCoy until Fisher,
what begon to speculate us to
At a recent demonstration held would! happen if all the propellers for military, airline and govern- at the ment officials, Fisher brought the nirernit reversed
aircraft down from 15,000 feet at a point four miles from the air- port to 1,000 feet above the run way in one minute and 22 seconds. The tin and approach for the hading requited another minute and 23 seconds, bringing the total title for let down and laiding to mutes and 35 seconds.
He discussed the problem with Brady, and as a result on ex- perimental programine was set up using a C- which Curtia Wright was operating for the Air Force for test purposes,
two
„A 'conventional' C-34' which was flying beelde Fisher came down
civil dhkinettlög contractors plant.
In continuation of the policy of
19501
1 with their Oversoza Bayern Badge. The charge to boyers from the United Kingdom will be 2- 68. a
cupy,
Admission
Trade buyers friar avortbar proc the textile and clothing industriessenting an oficial-invitation' er a the major display organised at business card at any entrance to the lost Fair will not be repedted the Fair will be given an Overs until 1961. Nevertheless, the tex-mas Brein Badge which will secure them free admisalon to alí tile and clothing display now in
to 4 pm, preparation for BIF 1960 will be actions between the hours of one of the largest sections of the opening, 9.30 sim
(except Sunday when the
Bhir Fair, und will be held at Earla throughout the period of the Fair Court, London.
closed) and from- 9:30 pm to 4 pant on the last day, Mar. 10.
"The
public will be admitted to the Fair in London only on Satur day Biny 18 and Wednesday May In London, at Earls Court the admission and Olympia charge to each building will be in 6d: In Biriningham, the public will be admitted after 2 m. dally at' a' change' of2u: "Gd;, Publicad mission is restricted to these tires solely for the convenience of over- seas, visitors: ;
It may be convenient for in- terested trade buyers to note that
London Fashion Fortnight, the will open on May 30, 10 days after the closing of the British India: tries Patr.
Trade Groups
For the convenience of vialtors some 20 industries represented at the Fair will be arranged in 20 groups of trades closely allled according to the ustial range of buyers Interests A booklet of floor plans giving the detallet location of each exhibitor will be presentou with a catalogue, free of charge, to ovory overseas, buyer on first admission to the Fatt!
Overseas B
Buyers Clubs
Special clubs are provided in exclusive use of overseas buyers; each of the Fair buildings for the as temporary headquarters dating the peried of the Fair
Adsaner ante flandeditions of the catalogack are publied covering the London and Birminge ham sections of the Fair The advance edition will igave the United Kingdom In February 1950, and will distributed in Htmltou, numbers to United King Actual tests began in November
dóm Government representatives 1047 using the reverse piich mechanism which is standard for
areas, for the use of oversens ground braking. Under these con- for a simulated emergency lander beftir starting their jour ditions the propeller, can travel 1g at the same time. This alter to the Fair
crats took four minutes and 4 The final edition of the catalo--and acords of interpreters at the from a fully advanced position corps preach the ground and gue will be available only at the (cruising) of plus 47 degrees had to descend in a series of entrances to the Fair, Overseas through flat pitch or 0 degrees to spirals. With the reversible pro-yers will receive one copy minus 18 degrees.
pellerr Fisher, was able to come con
at sh downth a straight pati angle of 40 degrees.
Actually, a negative pitch of 18 degrees is too high for braking in the air, and the maximum that Kis used for, this purpusu is
minus 8 degrees.
انه
Careful consideration also to be given to the matter of reverse windmilling at low negative pitch, This condition, arises when the
hailand
pick. Although the advantages Refore full reversing of proof a quick descent in an emer- pellers to fight can be applied to zeney are readily appreciated by the conventional transports, furthe airlines, it's not likely that ther studies will have to be made they will instal such systems on dr other aircraft and reversing their present transports." system will have to be designed specifically for this purposer
airstream passing the reversed The propeller will have to be
The location of these clubhis clearly shown in the plan booklet sue to each buyer, en first ad- mission to the Fair, and buyers are silvist to make themselves known in the cirb before making their
building tour of the
Cortespondenco may be ad dressed to overseas visitors" CATO of any one of these chibs. They refreshments are available, and are comfortably rfilshed, light otch club has a Reception Offeer service of visitors ha
Representatives of the Travel Association will advise visitors of tours anil' Holidays in Britain, and the Automobile §* Association will!} provide information on vel eat hire, atea
road tras
Services For Overseősí Buyers
Inquiries for any of the follow The reni advantages, to being acffes why be hade at the gained - only become apparent Ovetidhi Sthlm Clubs:: when descents are to be reads stortiond and typewriting ser more a
GALVANIZED PIPE
Stocks carried by
A. MING & CO., LTD
105, Des Voeux Ru, C
Contrar Market)
Re
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By
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for
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Pedder Building
FOR
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Tel:- 20001...
QUALITY-DURABILITY DESIGN
INSTALE
Standard
PLUMBING FIXTURES
WINITE FOR OUR HOME BOOKLET-
Agents:
probeiders tries to turn them in equipped for constant speed from altitudes of, 30,00 feet or viosa interpreters international ANDERSEN, MEYER & CO., LTD.
the opposite direction. If the pllof reverse as
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U. SPALINGER & CO. LTD.
ENDINUBRINGADIER
FALS 28091.
Belling
Connaught. Ron
foz Available
NG TRADING Co.
TEL. 19785.
COUNTY