This competition only allows 2.0 gm rubber max, so a thicker motor
has to be shorter, and overall weight a constant. And assuming same
batch of rubber, energy stored is constant.
Jeff Anderson
Livonia, MI
--- In Indoor_Construction_at_yahoogroups.com, "John Barker"
<john.barker783_at_...> wrote:
>
> Brant
> There is not really enough information in your post to analyse your
10%
> extra time. However if you kept the same rubber length when you
increased
> width then you have increased the available energy in the rubber by
about
> 30% so the 10% increase in time is not a surprise. Also the torque
absorbed
> by the propeller varies as the fifth power of the diameter so the
large
> increase in diameter of your new propeller means that the
rotational speed
> will be much lower so you are not `running out of turns'.
>
> Did you increase the P/D ratio in an attempt to match the increased
flying
> speed dur to the extra weight of rubber?
>
> John Barker - England
>
>
> [Non-text portions of this message have been removed]
>
Received on Mon Jan 28 2008 - 13:06:21 CET
This archive was generated by Yannick on Sat Dec 14 2019 - 19:13:45 CET