Sorry - missed that one. I don't typically mess with the pitch
distribution. If I do at all it's usually just to try to get the pitch
to be close to the same across the prop diameter. I've had some success
with just bending the blades by hand to change the distribution.
On Mon, 2008-03-17 at 15:53 +0000, soslipstream wrote:
> 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]
> >
>
>
>
>
>
>
[Non-text portions of this message have been removed]
Received on Mon Mar 17 2008 - 08:58:54 CET
This archive was generated by Yannick on Sat Dec 14 2019 - 19:13:45 CET