The effect of high tip speeds on the performance of aeroplane propellers
dc.contributor.author
Douglas, George P.
en
dc.date.accessioned
2018-09-13T15:47:24Z
dc.date.available
2018-09-13T15:47:24Z
dc.date.issued
1924
dc.description.abstract
en
dc.description.abstract
SUMMARY.
Thrust, Torque, Efficiency, Thrust Grading and
Blade Twist have been measured for a model airscrew
running at tip speeds up to 1300 ft. /sec. i.e. 1.2 times
the velocity of sound.
en
dc.description.abstract
CONCLUSIONS.
(1) There was found to be a considerable loss of
efficiency when the blade tips were run at speeds
exceeding 75% of the velocity of sound.
en
dc.description.abstract
(2) The lift coefficient of s blade section' was found
to increase rapidly as its velocity rose from
60 to 80% of the velocity of sound.
en
dc.description.abstract
(3) At high tip speeds the designed thrust distribution
along the blade is liable to serious modification
by blade twist.
en
dc.description.abstract
(4) As the velocity of a blade section approaches that
. of sound the centre of pressure moves back and the
drag coefficient increases.
en
dc.description.abstract
(5) There should be no difficulty as regards strength
in constructing wood airscrews to run at tip
speeds up to the velocity of sound.
en
dc.identifier.uri
http://hdl.handle.net/1842/31769
dc.publisher
The University of Edinburgh
en
dc.relation.ispartof
Annexe Thesis Digitisation Project 2018 Block 20
en
dc.relation.isreferencedby
en
dc.title
The effect of high tip speeds on the performance of aeroplane propellers
en
dc.type
Thesis or Dissertation
en
dc.type.qualificationlevel
Doctoral
en
dc.type.qualificationname
[unknown]
en
Files
Original bundle
1 - 1 of 1
- Name:
- DouglasGP_1924redux.pdf
- Size:
- 17.79 MB
- Format:
- Adobe Portable Document Format
This item appears in the following Collection(s)