AMATEUR CONSTRUGTOR

ByArthur W. J. G. Ord-Hume

Druine Turbulent and Turbi

All constructors of the Druine Turbulent and Turbi are advised that the following modification is to be carried out.

The modification concerns the attachment of the tailplane to the f,uselage.

In the event of the failure of the glued joint between the ash blocks and the surrounding structure, the tailplane might become completely detached from the attachment bolts. lt has therefore been thought"necessary to tie the attachment blocks to the structure by steel straps passing round the spars and their ends serving as washer plates on the outside of the plywood skin.

These straps are to be lf inch wide and are to be manufactured from 20 gauge mild steel plate.

At tfiis point the strap should undergo protective treatment, i.e. painting c.' cadmium plating, as it will not be removed'again.

Coat the inner face of the strap where it will touch the spar with Duralac jointing compound. Insert the strap and bend the other end carefully on the job. Drill back from the other side through the top end of the strap.

If ash packing blocks are used to support the tailplane clear of the rear fuselage, these should be fitted prior to the fltting of the straps which should pass over them. If blocks are fitted they should extend the full width of the spar as shown in the accompanying sketch.

TYPICAL STRAP INSTALLATION.

Aviation Diary

Sept. 2-8

Sept. l4-15

Sept. l9-22

To facilitate their insertion, carefully mark out and cut a slot in the plywood behind the spar at each attachment hole. These'slots should be 15lT6 inch long and 3132 inch wide. The edges should be radiused to prevent splitting.

Cut the strap to the correct length and bend up one end. Insert the other through the slots in the plywood skin. Pass a drill down through the ash block and make a centre spot on the strap end. Withdraw the strap, ensure that the spot is central and drill through full size.

Society of British Aircraft Constructors

-Flying Display and Exhibition. Farnborough

P.F.A. Rally. SYwell

Innsbruck and Salzburg International Air Rally, organised by the Austrian Aero Club.

SMA.LL ADVERTISEMENTS

Members of the Popular Flying Association may have the use of thjl column for'advertising articles wanted, exchange or disposal for ONE INSERTION r.tp to 24 words FREE. If more than one insertion it must be paid cash ii advance at the rate of 4d. per-word.(min. l2-wo-rds)Box No. ls. 6d. extra. Non-members chargeable at the rate of 6d. per word(min. 12 words). Box No.ls.6d. extra.

Cheques and Postal Orders should be crossed and sent to Fryers Advertlsing Service,lO Mitchom Lane, S.W.16.

WANTED Good original,Srfntings or drawings of flying scenes; owners or art'ists please write to James Henderson. 9a B-eJJearue Road. Edinburgh, 7.