Bruce, great write-up and something I can apply to my overweight
MiniStick, too.
LeRoy Cordes
AMA 16974
Chicago, IL
In God We Trust
On Sat, 20 Dec 2008 06:48:07 -0000 "Bruce McCrory" <hbm55_at_comcast.net>
writes:
> I don't see images, but the Utube video was enlightening. Prop looked
>
> good, and your comments mean there's a cheetah in the tank.
>
> Definitely wound to "no touch" torque. You want a torque meter, to
> record the no-touch force; then wind to 90% turns and back off to
> the "no touch" power. It will extend the flight time, giving you
> more
> turns, longer cruise torque.
>
> .039" (1mm) is going to be too powerful for the weight adjusted
> model. It's a good size for A6, however.
>
> Others on the list might see more than me. My thoughts:
>
> The wash can be reduced. I don't use any, relying on the MS to twist
>
> it in during launch torque and climb. Fixed wash equals cruise
> hassles and drag. This is a good opportunity to shave down the mass
>
> of the motor stick. Remove smidges of incidence - the bobbing can be
>
> that, or the high wash angles.
>
> MS should be about .08 - .10 grams. Mine are .07(-) and hard wood,
> 7# - 8#. Thinner sections twist better. Put about 5-7 degrees tilt
> in
> the stab - drop right side. Straighten the wing spars - no wash. Get
>
> some .023"-.027" rubber, same 11" length and wind it to 90% of break
>
> turns to test full model duration (and endurance). .027" is
> competition size for your lower ceiling. Start grinding down the MS.
>
> When the weight gets down close and the wound rubber doesn't break
> the stick, but the stab levels out with the wing spar line, you are
>
> close. The MS will automatically twist wash-in into the left wing
> panel. It's ready for fine tuning in the field house.
>
> If you can beat on the ceiling, test at full torque. A half, or
> third
> motor might help at this stage. The idea is to file down more wood
> section on the sides near the front wing post and increase the
> launch
> wash slightly. I've never done anything with the stick behind the
> posts but to reduce weight. MHO, the short moments counteract any
> advantage to moving the thrust line, like in EZB. Mini-stick seems
> to
> like steady, straight booms.
>
> This is fun homework.
>
> Bruce in Seattle
>
>
> --- In Indoor_Construction_at_yahoogroups.com, matthew taudevin
> <mattnsim_at_...> wrote:
> >
> > thanks bruce for the info.
> >
> > My props have helical twist.
> >
> > rubber is 11" loop of 1mm square and weighs .5grams
> >
> > The model weighs .6grams without rubber so all up weight with
> existing motor is 1.1grams. A little heavy but it is my first
> ministick. i may be able to take some weight off with some light
> sanding of the fuselage.
> >
> > ceiling is normal pointed variety and is about 20 feet high. here
>
> is video you will see the obstructions that I mean.
> > http://www.youtube.com/watch?v=-wzy7v0funk
> >
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>
>
>
LeRoy Cordes
AMA 16974
Chicago, IL
In God We Trust
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Received on Sat Dec 20 2008 - 10:18:47 CET