Futaba GV-1 function GvOf

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Robert Roland - 27 Jun 2008 22:48 GMT

If I understand correctly, the GvOf function is supposed to disengage
the governor when full throttle is applied. This makes sure you get
the engine's full power, even if it means overspeeding the rotor.

When I enable this function, the SwCd function still indicates "ON"
when I move the stick to full throttle. Is that correct behavior?

The manual states that the RPM setting must be set to 1600RPM or
higher for this function to work. Some googling, however, might
indicate that it is the actual head speed that has to reach 1600 for
this function to activate. Is that right?

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RoRo

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Nigel Heather - 28 Jun 2008 23:58 GMT

My guess is that

(a) - GvOf can only be enabled if the speed is SET to 1600 or more.

(b) - Obviously GvOf will only come into play if the full throttle drives
the throttle above the SET speed.

(c) - I suspect that you won't see SwCd change from ON because it will only
go to off when the throttle is full and the rotor speed is above the SET
speed. Unless you are using head loaders you wouldn't want to be putting
your head anywhere near the GV-1 to read the display.

Cheers,

Nigel

> If I understand correctly, the GvOf function is supposed to disengage
> the governor when full throttle is applied. This makes sure you get
[quoted text clipped - 7 lines]
> indicate that it is the actual head speed that has to reach 1600 for
> this function to activate. Is that right?

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Beav - 29 Jun 2008 20:34 GMT

> If I understand correctly, the GvOf function is supposed to disengage
> the governor when full throttle is applied. This makes sure you get
> the engine's full power, even if it means overspeeding the rotor.

Correct.

> When I enable this function, the SwCd function still indicates "ON"
> when I move the stick to full throttle. Is that correct behavior?

It is, because the gov is still seeing "zero" head speed (or more correctly,
zero engine speed). It will be looking at the figure you set as your maximum
governor speed divided by the gear ratio you set, but of course, it can't
"do" anything until it sees this calculated number because nothing is
spinning.

> The manual states that the RPM setting must be set to 1600RPM or
> higher for this function to work.

Rotor revs (engine rpm/gear ratio)

?Some googling, however, might

> indicate that it is the actual head speed that has to reach 1600 for
> this function to activate. Is that right?

Thereabouts, yeah.

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Beav

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Model Forum / Radio Controlled / Helicopters / June 2008

Futaba GV-1 function GvOf