Prop blocks met lage spoed

Een prop block is een stukje hout met exact bepaalde vorm waaruit relatief eenvoudig een efficiŽnte 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.

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Stahl Albatros

 

 

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

 

 

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

 

 

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

 

 

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

 

 

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

 

 

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

 

 

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”
     
     

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laatst gewijzigd op 10-nov-2012