Prop blocks met lage spoed
Een prop block is een stukje hout met exact bepaalde vorm waaruit relatief eenvoudig een efficiënte propeller te snijden is. Om het juiste prop block te kiezen kan je het best eerst het artikel over propellers doorlezen. Wanneer de gewenste diameter er niet bij staat kan een ontwerp ook worden vergroot of verkleind zonder dat daarbij de P/D anders wordt.
| Nederlands | English | |
Stahl Albatros |
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Ontwerp: Earl Stahl, Model Airplane News, 1945 model: dubbeldekker, spanwijdte 45 cm (17½ inch) D = 15 cm (6 inch) P/D(50%) = 0,95 P/D(tip) = 0,95 bladbreedte = 3,6 cm (24%) |
 afmetingen (dimensions) in inches |
Design: Earl Stahl, Model Airplane News, 1945 model: biplane, span 45 cm (17½ inch) D = 15 cm (6 inch) P/D(50%) = 0,95 P/D(tip) = 0,95 blade width = 3.6 cm (24%, 1.4") |
Stahl MiG 3 |
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Ontwerp: Earl Stahl, Model Airplane News, 1943 model: spanwijdte 58 cm (23 inch) D = 19 cm (7,5 inch) P/D(50%) = 0,97 P/D(tip) = 0,97 bladbreedte = 4,7 cm (25%) |
 afmetingen (dimensions) in inches |
design: Earl Stahl, Model Airplane News, 1943 model: spanwijdte 58 cm (23 inch) D = 19 cm (7.5 inch) P/D(50%) = 0.97 P/D(tip) = 0.97 blade width = 4.7 cm (25%, 1.9") |
| "Select a very hard balsa or soft white pine block of the correct size for the propeller. Drill the tiny hole for the prop shaft and then cut out the blank as shown. A right-hand prop is to be carved. Cut away the back face of the blank first until the backs are as desired, then cut away the front until the blades are of the proper thickness. Reduce the depth of the hub and shape the blades in a manner similar to the prop on the original model. With rough and then fine paper sand the propeller to a smooth finish. Shape the spinner from a light grade balsa block, then notch it to fit over the prop hub. Before the spinner is attached permanently, the type of free-wheel gadget to be used, if any, should be considered and provisions made for it. Apply several coats of clear dope with light sanding between each to smooth and harden the surface." | ||
Stahl Hurricane |
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Ontwerp: Earl Stahl, Flying Aces, 1940 model: sport (geen schaal!) spanwijdte 80 cm (32”) D = 30 cm (12 inch) P/D(50%) = 1,05 P/D(tip) = 1,05 bladbreedte = 2,8 cm (9,3%) "One block 1" by 1-1/2" by 12" very hard balsa for prop" |
 afmetingen (dimensions) in inches |
design: Earl Stahl, Flying Aces, 1940 model: sport (not scale!) span 80 cm (32”) D = 30 cm (12 inch) P/D(50%) = 1.05 P/D(tip) = 1.05 blade width = 2.8 cm (9,3%, 1-1/8") "One block 1" by 1-1/2" by 12" very hard balsa for prop" |
Caudron peanut |
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ontwerp: Emmanuel Fillon model: Caudron peanut, 33 cm spanwijdte D = 12 cm (5 inch) P/D(50%) = 1,1 P/D(tip) = 0,9 bladbreedte = 1,7 cm (14%) |
 afmetingen (dimensions) in mm |
esign: Emmanuel Fillon model: Caudron peanut, 33 cm span D = 12 cm (5 inch) P/D(50%) = 1.1 P/D(tip) = 0.9 blade width = 1.7 cm (14%, 0.66") |
Cessna CR-3 |
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ontwerp: aeroaces model: Aeroaces CR-3 spanwijdte 55 cm (22 inch) D = 25 cm (10 inch) P/D(60%) = 1,5 P/D(tip) = 1,1 bladbreedte = 4,0 cm (16%) |
 afmetingen (dimensions) in inches |
design: aeroaces model: Aeroaces CR-3 span 55 cm (22 inch) D = 25 cm (10 inch) P/D(60%) = 1.5 P/D(tip) = 1.1 bladbreedte = 4.0 cm (16%, 1.6") |
Bill Henn |
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D = 25 cm (10 inch) P/D(60%) = 1,13 P/D(tip) = 1,18 blade width = 3.6 cm (14%) |
 afmetingen (dimensions) in inches |
Design: Bill Henn D = 25 cm (10 inch) P/D(60%) = 1.13 P/D(tip) = 1.18 blade width = 3.6 cm (14%, 1.45") |
Lindberg rubber powered pursuit |
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PAUL W. LINDBERG, October 1938, Popular Aviation: “This type of propeller is known as the true pitch” |
 afmetingen (dimensions) in inches |
PAUL W. LINDBERG, October 1938, Popular Aviation: “This type of propeller is known as the true pitch” |
