3498 research outputs found
Sort by
The aerodynamic characteristics of a family of related hovercraft shapes
No full textThe handling qualities of hovercraft indicate the need for a better
understanding of the influence of the basic aerodynamic characteristics.
This report is the first of a series in which the aerodynamic
characteristics of hovercraft shapes are studied with particular reference
to current design variables starting with simple solid block models and
progressing to more sophisticated hollow models having cushion efflux and
air-induction
Push-pull fatigue properties of wires in an iridium - 5% tungsten alloy
No full textIntroduction
This memorandum reports a series of tests to determine the fatigue
properties of an iridium - 5% tungsten alloy at 600°c and 700°C.
A previous memorandum, Memo. Mat. 61, reports the fatigue properties
at room temperature of the same alloy
Theoretical aspects of aero-engine altitude relighting performance
No full textThe purpose of this note is to review some current theories of
ignition in stagnant and flowing mixtures, and to present an alternative
theory to describe the process that occurs in a turbojet combustion
chamber when the engine is being relighted after a flame-out at high
altitudes
The thermal degradation of epoxy resins 4: the thermal degradation of polypyromellitimides 2
No full textA summary of work carried out between 1st September, 1967 and 1st March,
1963 on the thermal degradation of the resin hardener systems DEM/EP274,
DDM/KOPDX171, PA/EP274, PA/KOPDX171, THPA/EP274, PMDA/EP274
The measurement of biaxial strains in coated fabric materials using the disc-replica method
No full textA method of measuring biaxial strains in coated fabric type materials
is presented whereby the strain is deduced from the distortion of a circular
impression made on the material. The impression is placed on the material
when loaded, enabling all measurements to be made with the material in its
relaxed, unloaded, state
Test report no. PLBO/5: comparative wear tests of PERPRO tools grade N35/RD80 against Sanvik SIP machining EN 9
No full textTools of grade N35/RD80 and S1P were tested at 600 fpm cutting speed, 0.010 in.rev. feed and 0.10 in. depth of cut to 0.030 in. flank-wear. The results showed
that the grade S1P gave a tool life between six and seven times
greater than grade N35/RD80 together with less crater wear
Test report no. PLBO/7 evaluation of PERPRO tools grade RD 92 machining EN 9
No full textFour tips of RD 92 were tested at 600 fpm cutting speed, 0.010 in./rev.
feed and 0.10 in. depth of cut to 0.030 in. flankwear. Two tips gave a
tool life of 56 min., but with severe crater wear. The other two tips gave
a shorter life - one failing after 30 min. cutting as a result of the breakdown
of the crater lip
Horizontal band-saw
No full textThe effect of various parameters on the performance of the band saw
when cutting mild steel-with a 10 t.p.i. raker-set blade were established
over a limited range. These are discussed fully in the ‘conclusions'.
With this limited survey it was not found possible to establish the optimum
conditions of operation