Stefan Hafner
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Everything posted by Stefan Hafner
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Nearing completion. just awaiting fitting of radio and covering
Stefan Hafner posted a gallery image in Member Albums
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The March Grand Prize Draw
Stefan Hafner replied to David Ashby - Moderator's topic in All Things Model Flying
Oh yeah, that would be lovely with a set of floats -
Hey Don't be sad. I'm one of the younger generation of flyers, but all but one of my planes are artf. There's a few traditional kits but the last two were a 2m aerobat and a 1/4 scale T1 Bulldog, both built from plan
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The February Grand Prize Draw
Stefan Hafner replied to David Ashby - Moderator's topic in All Things Model Flying
I love ......... Plane -
Pick a plane 2008!
Stefan Hafner replied to David Ashby - Moderator's topic in All Things Model Flying
How about 1) P 38 Lightning (twin 60 Four stroke) 2) Eurofighter (EDF) 3) AV 8 Harrier (vectored thrust would be fun but a wee bittie ambitious perhaps) -
JP Mini Aviator free prize draw
Stefan Hafner replied to David Ashby - Moderator's topic in All Things Model Flying
I love .......... Plane -
Hi Does anyone know where to get a 1/4 scale pilot for a Scottish Aviation T1 Bulldog. I feel it really needs one as the cockpit look a bit bar
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With regard to the number of blades on a proppellor. As the propellor rotates it generates a trailing vortex from the tip, much like on a wing, which creates drag and at the speed that prop tips are moving this can be a significant loss. This means that a 2 blade propellor is more efficient than a prop with more blades because less of the power from the engine is used overcoming the drag force. On the likes of corsairs this is less of a problem because 1. They have a bucketload of power available 2. The RPM of these eninges is lower than model engines so they are generating less of a drag force as they are moving more slowly
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