I'm trying to work out a geometry calculator where you can enter in six, maybe seven measurements on your VP mechanism and it will tell you what your yoke angle and prop rotation angles would be.
The basic geometry is pretty simple - just solving for isosceles triangle angles. Solving the required spring constant needs the angular travel of the yoke between the high pitch and low pitch screws.
Regards.
Mike Kirda
--- In Indoor_Construction_at_yahoogroups.com, Tapio Linkosalo <tapio.linkosalo@...> wrote:
>
> On 11.12.2012 22:50, mkirda_at_... wrote:
> > Can you estimate the angular difference between low and high pitch?
> > Maybe 20 degrees?
>
> Bottom pitch at 150mm radius 24 degrees = 420mm
> Top pitch 42 degrees = 850mm
> Angular difference in blades 18 degrees.
>
> Yoke diameter 5mm, actuating arm length 4.5mm -> change in the spring
> angle 5/4.5 * 18 degrees = 20 degrees (bingo!) Prop pitch starts to
> reduce at approximately 8 to 9 g*cm.
>
>
>
>
> -Tapio
>
Received on Wed Dec 12 2012 - 14:01:22 CET
This archive was generated by Yannick on Sat Dec 14 2019 - 19:13:47 CET