Bill,
Thanks for your reply. We still have a questions on further
modifying the Ikara prop for wash-out. Any suggestions?
Thanks,
Tom
--- In Indoor_Construction_at_yahoogroups.com, Bill Gowen <b.gowen@...>
wrote:
>
> Tom
> The most successful local LittleSquare is using the high
performance
> wing design shown as an alternate on the plan. I believe this is
an 8%
> camber. It seems to be about half a minute better than the plain
vanilla
> wing in a low ceiling.
>
> I haven't had much experience with Super Sport since I have a lot
of Tan
> II. Last Friday I was helping a team flying a nicely built one of
Dave's
> models on .095 SS and the backwards Ikara prop that he supplies.
They
> topped out at about 1 1/2 minutes. A change to .095 2/98 TanII put
them
> at around 2:15. They are changing to the bigger prop and will be
flying
> on .100 7/02 next time.
>
> The Chamblee team has 2 LittleSquares using the modified wing
section
> and the big prop. They are in the 3 1/2 minute range in 25 feet
also
> flying on .100 7/02.
>
> I think the big prop requires heavy rubber for low ceilings. For a
> higher ceiling maybe a little less would be okay. If you have to
use SS
> I'd probably go somewhere over .100. But 10% turns left is not bad
so
> maybe your model is flying on less power than these.
>
> My best luck with the big Ikara has been with the TE of the blades
cut
> off flush with the spar and the pitch set around 14.
>
> On Mon, 2008-03-17 at 03:10 +0000, soslipstream wrote:
> > Bill Gowen-
> >
> > Thanks for publishing the LittleSquares plan. Two weeks ago my
> > daughter Ruth patiently made notes on its features. She is using
my
> > Hi-Espect design and was using a wing camber that was almost
dead-on
> > with your design. She also has twin circular fins formed using a
> > small glass olive jar. The airplane is ballasted up to 6 grams.
She
> > flies on .087 Tan SS rubber.
> >
> > Last week she built a new wing with 5% higher camber and had me
time
> > two flights at the high school. At a max of 21'(bottom of
scoreboard
> > box in the gym's center) both flights were over 3 minutes. She
was
> > only using 3/5's max torque on the motor winds. The cruise was
over
> > 50% of the flight time. The airplane came down with 10% winds
left.
> >
> > We would both like to know this; she is using the fat Ikara prop
> > with your suggested modifications. She wants to modify a second
> > version and have some wash-out on the tips. How does she add
this
> > wash-out and much area should she modify?
> >
> > The IN state finals are under a 35' clean area with probably an
> > orbit diameter of 50'+ available. She plans on flying a large
orbit
> > with a slow climb, long cruise and slow descent. Will the added
wash-
> > out help? Should she consider upping the cross section on the
rubber
> > motor?
> >
> > Thanks,
> > Tom
> >
> >
> >
> >
> >
> >
> >
>
>
> [Non-text portions of this message have been removed]
>
Received on Mon Mar 17 2008 - 08:53:41 CET
This archive was generated by Yannick on Sat Dec 14 2019 - 19:13:45 CET