Wombat,
The "Little Square" I built has the CG about 3/8" behind the
trailing edge with a 2g motor attached and 1/2" behind the TE
without a motor. It pretty much flew off the board, with the
exception of the tail incidence. I have found it to be very
sensitive to addjustments in the tail, but I suppose that is to be
expected with such a small tail chord (a change of 0.1" on the post
changes the incidence angle a whopping 4 degrees!). Flight times
were about 3:00 and still have a good bit of room for improvement.
Good Luck!
Eric Monda
--- In Indoor_Construction_at_yahoogroups.com, "Bill Gowen"
<b.gowen_at_...> wrote:
>
> The design program shows a static stability margin of 72% with
the CG at 1/8" behind the wing. You shouldn't have to change the CG
but feel free to do whatever it takes.
>
> My personal model has only one flight on it due to factors
beyond my control. That flight was outside at night and was around 2
minutes on an 800 turn wind. If I ever get to fly again (actually
should happen on November 18) I'll report on the results. I have a
wood wing on mine now but will try both wings if I have the time.
>
> ----- Original Message -----
> From: Neil Dennis
> To: Indoor_Construction_at_yahoogroups.com
> Sent: Friday, November 03, 2006 8:32 AM
> Subject: [Indoor_Construction] SO models
>
>
> Wonder, has anyone successfully flown the "little square"
model ? My
> group is having a problem with "tail standing", the one I built
also did
> that. So, what I'm wondering, the stab seems to be too small to
be a
> true lifting stab so the CG can be behind the wing, it doesn't
seem to
> have enough "control". The boys are not happy when the DD Mark
IV's we
> have putt around happily in the windy gym while the LS's fall on
their
> tails and usually break.
>
> Anyhow, I'm going to build another model with the same wing and
stab
> sizes but with the CG at about 50% of chord and see what happens.
>
> Any thoughts, I think the tail volume is much smaller than the
usual
> indoor model that has the CG well behind the wing.
>
> wombat
>
>
>
>
> [Non-text portions of this message have been removed]
>
Received on Fri Nov 03 2006 - 06:50:23 CET
This archive was generated by Yannick on Sat Dec 14 2019 - 19:13:44 CET