On 22.6.2012 6:15, jannis1indoor wrote:
> Would recommend building the prop hub with sockets so that you can
> rotate the blades to change the pitch and have a good pitch gage along
> so that you set the pitch on site. A-Z sells a real nice variable pitch
> gage. A pitch range of about 23 to 35 inches is what I would recommend
> but this all dependent on your prop design, rubber size you want to fly
> on and your overall aircraft which you will not know until you test it
> out at the site.
Sockets is a good thing, but I would also recommend some means of
adjusting the low pitch without turning the blades in the sockets. As
Nick pointed out, once you get too low in the low pitch, the prop starts
to act as airbrake, making the model dive, so there may be some need to
adjust the low pitch (but once you get it right, not the same need to
trim per site as for high pitch and pre-tension). So possibly a setscrew
is not needed, some shimming with balsa or bending some wire would do.
The reason to adjust the low pitch without turning the blades is that if
you do the latter, you also change the high pitch and the pre-tension,
meaning that you essentially need to start trimming the VP from the very
start.
-Tapio-
Received on Thu Jun 21 2012 - 22:48:58 CEST
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