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HelicopterMain Discussion › Over revving with GV1?
10-22-2004 12:00 PM  13 years agoPost 1
daz59

rrApprentice

Tokoroa, New Zealand

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Hi,

I have a GV1 in my R50, when I descend I get over revving.
On idle up 1 I have the head speed set at 1700rpm, when I descend it jumps to over 1800.
Anyone have any idea why the GV1 isn’t stopping this?

Darren

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10-22-2004 12:02 PM  13 years agoPost 2
cjw

rrVeteran

UK - Cheshire

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Sounds like your engine could be running too lean?

GV-1 Setup, make sure your idle point, high and low are set correctly.

Clive

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10-22-2004 12:23 PM  13 years agoPost 3
daz59

rrApprentice

Tokoroa, New Zealand

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Hi,

the idle point is set right.
When I land the engine head is around 210f so it shouldnt be lean?
After about 4 seconds the revs come back down to what they should be.

Darren

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10-22-2004 12:32 PM  13 years agoPost 4
cjw

rrVeteran

UK - Cheshire

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If it takes a while for the revs to come down it is most likely too lean.

On my OS50, the temp just below the head is below 200F (usually around 180 - 190F).

Try richening a little and see if it helps. Nothing to lose

Clive

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10-22-2004 12:42 PM  13 years agoPost 5
Drunk Monk

rrProfessor

Preston, UK

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What servo you got on the throttle? I get alittle overspeeding with mine with an DS811 but only for a very short time.


Stephen

I only open my mouth to change feet.....

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10-22-2004 01:12 PM  13 years agoPost 6
dariof

rrVeteran

Henderson, NV /​Laguna Niguel, CA

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daz59

4 seconds is way to long for the idle to come dwn after landing and reducing throttle. Waaaay too long.

The engine should go right into smoothe idle within a second or so.

I 2nd whomever said it was too lean. Try Richening the low end just slighty. (Low end because when you land and the throttle is down, it takes 4 seconds to settle into a normal idle according to your post).

Best Regards, Dario

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10-22-2004 09:08 PM  13 years agoPost 7
daz59

rrApprentice

Tokoroa, New Zealand

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HI,

Not when I land just when I descend.
I will try richening it up.
The servo is hitech, cant remember the numbers but its .14second.

Darren

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10-22-2004 10:48 PM  13 years agoPost 8
TurboStew

rrApprentice

Ft Collins, CO

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You know, I have seen this problem a few times. I found the fix to be setting some "expo" in the throttle linkage. Make the throttle stroke more for a given servo movement at full throttle and less towards idle. This usually means moving out a hole on the servo arm, reclocking it, and either lengthening or shortening the linkage. This always seems to smooth out the GV-1 for me. Anymore, I just always set up mine (and other people's) this way from the start. No problems and seems to work better than a linear setup.

8.5 pound 90 birds Rock!

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10-22-2004 11:38 PM  13 years agoPost 9
SPB

rrElite Veteran

Athens - Greece

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I also have a small overspeeding in descent with GV1. I think it's normal but as alexander said it's 100-150 rpm and only in descent.

My engine setles down after 2 secs mol.


Sotiris
myhelis.com Flying Team

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