On Sat, Apr 23, 2011 at 2:06 PM, izgo <izgo_at_yahoo.com> wrote:
>
>
>
> Thanks all taking part in poll.
> The results are well spread on all options.
>
> Ignacio.
>
>
>
--- In Indoor_Construction_at_yahoogroups.com,
> Indoor_Construction_at_yahoogroups.com wrote:
> >
> >
> > The following Indoor_Construction poll is now closed. Here are the
> > final results:
> >
> >
> > POLL QUESTION: In the design of an F1D variable pitch propeller:
> >
> > What is the better pitch at wich the propeller has to be initially
> formed?
> >
> > CHOICES AND RESULTS
> > - Lower pitch, 7 votes, 30.43%
> > - Higher pitch, 7 votes, 30.43%
> > - Average pitch, 5 votes, 21.74%
> > - Doesn't much mattter, 2 votes, 8.70%
> > - Other (pelase post a message explaining), 2 votes, 8.70%
> >
> >
> >
> > For more information about this group, please visit
> > http://groups.yahoo.com/group/Indoor_Construction
> >
> > For help with Yahoo! Groups, please visit
> >
> http://help.yahoo.com/l/us/yahoo/groups/original/members/forms/general.html
> >
>
>
>
If one starts of with and initial higher pitch that is helical, then lower
the blade angle as the torque runs down, the effect is a gradual washout at
the tips and at the hub which I think increases the relative prop
efficiency. (cf. Herb Kothe's Wakefield prop)
Received on Sat Apr 23 2011 - 18:32:48 CEST