Model Forum / Radio Controlled / Helicopters / November 2003

David

The T9VHP actually has 12 point throttle curves for each flight mode but is
from the era when it was thought that using an invert switch was the way to
go for inverted flight. It was top of range kit in its day,  but the
individual curve points can only directly be varied within a very limited
"window" around a straight line with a rather inflexible step change being
applied below mid stick when Idle ups are selected.

Ken

I know it sounds that way, David, but unfortunately, it's true.  The orginal
Futaba 9 channel was the 9VHP.  It looked and operated very much like the 9ZHP
with the same 13 points on the throttle and collective curves.  The only
problem was, for some unfathonable reason, Futaba wouldn't let you take the
lowest program point to 100%.  The best you could get as I recall was around
60% or so.  It also wouldn't let any individual program point move beyond a
certain percentage off the adjacent program point.  This severely limited the
flexibility of the 9V radio.

The ironic part was that, Futaba had released it's 7UHP radio at about the same
time the "new" 9V system came on the market.  The 7UHP system, a radio that
cost at or a little less than HALF the price of the 9V, had a 5 point program
curve for throttle and collective that allowed the user to program any point
between 0 and 100% which made the cheaper 7 channel radio much more flexible
than the "top line" 9 channel system.

Needless to say, there were MANY unhappy Futaba pilots in the world and it
wasn't long before the 9V was upgraded to the 9Z, the radio that the 9V
"should" have been from the start.

Fly Safe,
Steve R.

I suppose you could do it that way but that's making it a lot more complicated
than it needs to be.

I control my governor with a single Pmix.  The GV-1 has a connector that can be
plugged into an aux channel to control the program rpm of the governor.  You
can then use a switch on that channel to control the programmed rpms or you can
use a pmix for the same purpose.  This is how I do it.

1.  Go to the model menu (MDL) and select function (FNC).  Select the aux
channel you want to use to control the governor.  In my case, I use Aux2.  Now
set the control and trim (CTR & TRM) functions to Null.  The screen will
display "+/- ***" at both location if you've done this correctly.

2. Now setup a program mix for each flight condition you've got active in the
radio.  Set the mix type to offset (OFS).  When you do this, the Master
selection will display "***".  Set the Slave selection to Aux2 or whatever
channel you're going to use.  Now go to the next (NXT) screen and you've have a
single box to input data in.  For any flight condition you want the governor
off in, put "-100".  Any flight condition you want a slower rpm in, put "0" and
any flight condition you want a higher rpm, put "+100".

3.  Now activate your radio system and the GV-1 governor and set the three
speed selections to "Off", "Lower rpm (1500 in my case)", and "High rpm (1800
in my case)" respectively.  Now flip through the programmed flight conditions
and watch what the governor's display shows.  It should indicate "off" in any
flight mode that's programmed to -100, your lower rpm setting when programmed
to 0 and the higher number at +100.  About the only thing that can go wrong
here is if the governor speeds are backwards.  In this case, simply reverse the
aux channel used to control the governor.

It works very well for me.  About the only disadvantage is that you'll only
have two program speeds using this method.  Using a switch allows you to have
three speeds but I've not found that to be a big deal.  I just use one speed
for hover and the higher speed for aerobatics.  The good part is, there's no
extra switchs to flip.  The governor activates and controls the programmed
speeds as a function of the flight condition you're in.  It's all automatic.

For me, I set normal mode and throttle hold to -100 to turn the governor off
for starting and autorotations.  Idle1 is my hover mode and gets "0" and I've
got Idle 2 and Idle 3 which are set at +100 for aerobatics.  The only
difference between those two are the collective curves.

There are a number of ways to control the GV-1 with a 9V or 9Z.  This one may
sound complicated but I promise, it takes a lot longer to describe than to
actually do!

Hope this helps & Good Luck!
Fly Safe,
Steve R.

Tom

It is exactly this idea of using a clever mix that I am looking for.
Unfortunately I am not an expert on unconventional programming and I was
hoping that someone could confirm that:-

a) Someone had definately been successful in using clever mixing  to create
a Vee curve which could be switched in using an idle up switch
b) the eMail address of the said person :-)

Ken

20% is enough Tom. A governor (any of theose on the market today) will work
perfectly with the VHP.

And with a gov in the system, it'd be almost impossible to beat. I wish I
still had mine, but thankfully, I've got an FC28 which was a very similar
radio BUT with the "" curve function which I haven't used since I started
using governors. :-)