WONDERFUL PROPELLERS.
, A modern aeroplane-propeller is one of the strongest and most perfect products pf man's handicraft. Some aeroplane engines l'un at ivK} revolutions a minute, and can be geared up to 20Q9. An engine of this power would use a- $■ foot 6-inch propeller, and' the speed, of tlve blade-ends would bo m the neighborhood of 600 miles an hour. Revolving at this terrific rate, the slightest imperfection m th« wood from v.hich the propellers are made would tend to dJiftr.upt them, and icausc them to fly to pieoee. For this reason oniiy tl.' htst »n<l' hardest wood .from the hean of the tree m used for pcopoller-blade:-. It takes 20C0 feet of tfrmUr m the roug to furnish 200 Uwi of u'ot^d 1 good .enough for propellers. B'laek walnut is the very best kind of wood for propeller-blades* for, be#id«s being immensely tough, it does not splinter when hit by a "projectile. Next, m the order named, como mahogany, whito oak, ash, maple, birch, and dierry.
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https://paperspast.natlib.govt.nz/newspapers/PBH19180716.2.10
Bibliographic details
Poverty Bay Herald, Volume XLV, Issue 14658, 16 July 1918, Page 3
Word Count
167
WONDERFUL PROPELLERS.
Poverty Bay Herald, Volume XLV, Issue 14658, 16 July 1918, Page 3
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