Fred,
Thanks for reminding me about your files. I just downloaded them & have been
entering some "imaginary" data. I haven't ever recorded "unused turns" so I
will need to start recording that data before I can get any meaningful
results. I think it will be interesting to experiment with different motor
widths/weights & see how the results compare to the theoretical data.
Gary
In a message dated 11/27/2008 9:13:38 A.M. Central Standard Time,
frash_at_chartertn.net writes:
Happy Thanksgiving, Gary and ALL,
If you go to the files section of Indoor_construction, there are two rubber
motor files from me, one compiled .exe file and one spreadsheet. Both do
about the same and let you enter launch and landing winder turns and rubber batch
for a few batches. Then run the plot. The area between the launch vertical
line and the landing vertical line is your area and it is calculated for you.
You can also calculate the prop revolutions per second and the average power
used during the flight. I calculate the power in milliwatts.
To answer your real question requires more knowledge than I have, but at
least this can help you measure and calculate something to compare between
various motors and props.
Fred Rash
---- Warthodson_at_aol.com wrote:
>
>
>
>
> ____________________________________
> From: Warthodson
> To: Indoor_Construction_at_yahoogroups.com
> Sent: 11/26/2008 9:54:31 A.M. Central Standard Time
> Subj: low ceiling high duration
>
>
> I am interested in hearing what strategies seem to work for increasing
> duration in cluttered low ceiling sites. Particularly sites where it is
not
> practical to spend much time "scrubbing" because of the clutter & high
likelyhood
> of getting hung up. Assume making the airplane (less rubber) lighter is
not an
> option.
> Are airfoils with greater camber of any help? Would you agree that for
high
> ceiling sites, cambers seem to be 3% to 5%? How about low ceilings?
> In categories with no limit on rubber weight what seems to be better:
> Low pitch props & thin rubber or higher pitches & thicker rubber, or some
> other combination? I.E. How do you optimize the "area under the curve" of
the
> rubber when you are limited to a low ceiling & minimal scrubbing?
> Thanks,
> Gary
>
>
>
>
>
>
> ____________________________________
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Received on Sat Dec 06 2008 - 06:52:35 CET