--- In Indoor_Construction_at_yahoogroups.com, "Akihiro Danjo" <adanjo-373@...> wrote:
>
> Hi Tapio san.
> Glad to know you enjoy indoor because it must be cold even indoor in your country.
> >Then from 4 to 6 minutes the prop seems to switch over to low pitch, quite rapidly even though I have tried to make harder springs than I have had before.
>
> Why harder spring? Should you try softer spring?
Hi Aki,
I found it counter-intuitive initially, but it helped me to think of it this way:
- The range of deflection for the spring is fixed (from the high pitch stop to the low pitch stop)
- A spring with a higher spring rate will have a larger change in torque across the range of deflection
- A larger change in torque of the spring means that more turns will have to come off the motor to get from one end of the deflection range to the other
- Thus, a higher spring rate results in a longer change-over of pitch
Received on Mon Nov 26 2012 - 09:20:02 CET