E-Impact Update

[Norm500]

One caution on setting the idle with the throttle trim.  You might 
find that if you ever reach LVC during the flight, the motor might 
not restart for you and you'll have to dead stick.  Most 
controllers allow a restart from LVC after reducing the throttle 
to idle, but if the trim has been raised it might not see a low 
enough signal to restart.  You can, of course, reduce the throttle 
trim and then get a restart if you have the time and awareness to 
realize what has happened.

Norm

----- Original Message ----- 
From: <Jim_Woodward at beaerospace.com>
To: <discussion at nsrca.org>
Sent: Wednesday, June 15, 2005 5:44 AM
Subject: E-Impact Update


> Hi All,
>
> I now have 6 flights on the Impact.  Not a hint of a problem 
> yet.  I've
> tamed the "kick" of the Hacker by using a simple procedure. 
> Once plugged
> in, I raise the left slider (now slaved as throttle trim) so 
> that the
> engine starts turning over in the 300 rpm range (which has no, 
> to just a
> very small kick), then raise the throttle to full throttle, then 
> down to
> idle.  With the Acro 90 set, I then reset the idle rpm for 
> around the 300
> rpm range, and fly.  The idle stays through out flight.  Also, 
> Acro 90 is
> set with the "exponential" curve in the controller, and I've 
> adjusted the
> transmitters (9WCII) to somewhat of a reverse expo, and the feel 
> is really
> nice like this.  Small reductions from full throttle are 
> noticable, and
> the baseline stuff is at a nice (slow to medium) speed.  The 
> small
> reduction from full throttle having good resolution is 
> important, because
> you do not need full throttle to fly P05 (only after the upline 
> snap).
>
> The power side of the equation is close to "set", however, the 
> Impact has
> some interesting characteristics to get use to.  The timing on 
> snaps and
> spins is different than I am used to, due to (what I believe) 
> are heavy
> wing panels.  It would be interesting to know if someone has cut 
> foam
> cores for this model yet....  This also gives a "wallowy" look, 
> if you fly
> too slow which is all to easy to do with the E-setup.  Although 
> the
> general flight is definitately slower than with a glow setup, 
> you need to
> still set the plane in a speed envelope where it "flys" its 
> best.  Also, I
> did not recognize during the build process that the vertical fin 
> has right
> thrust built into it. During building, I added a smidgen more 
> R-thrust,
> and this will now need to be removed.  However, the tip of the 
> rudder
> counterballance is 3/16" off center of the vertical fin, so I 
> don't think
> this amount of offset is entirely due to my little extra 
> R-thrust.
>
> CG:  Mine is flying around 35 mm ahead of the recommended range, 
> and still
> a little tail low.  It is not squatting through radius anymore, 
> and still
> seems to fly light in the pitch axis.  Mixes: only 2% down 
> elevator to low
> throttle.  Although I'm still fiddeling with the tracking 
> (rudder trim,
> wing weight), it seems very close, and no other need for mixing 
> has been
> blareling obvious yet.  In regards to CG, try not to get caught 
> up in
> "simple" tests (or the trim chart) or relative prior experience. 
> Continue
> to play with the CG until the plane is flying better.
>
> Thanks,
> Jim W.
>
>
>
> 


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