irvine 36 MKII, throttle doesnt cut

[Oliver]

Hi

I have an irvine 36. It was dusk and cold and the engine wouldn't cut at
lowest throttle. Is this common? How can i make my throttle cut switch
work?

Oliver

[Tim]

"Oliver" <my_first_name_here@raincode.co.uk> wrote in message
news:bms2gv$gdd$1@hercules.btinternet.com...
> Hi
>
> I have an irvine 36. It was dusk and cold and the engine wouldn't cut at
> lowest throttle. Is this common? How can i make my throttle cut switch
> work?
>
> Oliver
>
>
Apologies if this sounds patronising, but the following is a mistake I have
made several times: on my JR 662 the throttle cut switch to work only works
in "normal" flight mode. This has lead to much frustration when I have been
wondering why the engine didn't want to shut down! I imagine the same may be
true of other radios - i.e. you need to be in a specific flight mode for the
throttle cut switch to work.

Alternatively, try bringing the trim (and sub-trims, if any) all the way
back. I find that the TT39 on my Raptor starts off at one trim setting and
then I have to progressively reduce the amount throttle trim during a
session in order to reduce the idle RPM. No bad thing as it is less likely
to cut out when I don't want it to!!

Tim


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[Oliver]

Hi

My problem is the throttle is as closed as it goes but the engine still runs
very slowely.

Oliver


"Tim" <void@invalidemail.com> wrote in message
news:Csgkb.651$tg6.393@news-binary.blueyonder.co.uk...
>
> "Oliver" <my_first_name_here@raincode.co.uk> wrote in message
> news:bms2gv$gdd$1@hercules.btinternet.com...
> > Hi
> >
> > I have an irvine 36. It was dusk and cold and the engine wouldn't cut
at
> > lowest throttle. Is this common? How can i make my throttle cut switch
> > work?
> >
> > Oliver
> >
> >
> Apologies if this sounds patronising, but the following is a mistake I
have
> made several times: on my JR 662 the throttle cut switch to work only
works
> in "normal" flight mode. This has lead to much frustration when I have
been
> wondering why the engine didn't want to shut down! I imagine the same may
be
> true of other radios - i.e. you need to be in a specific flight mode for
the
> throttle cut switch to work.
>
> Alternatively, try bringing the trim (and sub-trims, if any) all the way
> back. I find that the TT39 on my Raptor starts off at one trim setting and
> then I have to progressively reduce the amount throttle trim during a
> session in order to reduce the idle RPM. No bad thing as it is less likely
> to cut out when I don't want it to!!
>
> Tim
>
>
> ---
> Outgoing mail is certified Virus Free.
> Checked by AVG anti-virus system (http://www.grisoft.com).
> Version: 6.0.528 / Virus Database: 324 - Release Date: 16/10/2003
>
>

[MPA]

On Sat, 18 Oct 2003 20:31:03 +0000 (UTC), "Oliver"
<my_first_name_here@raincode.co.uk> wrote:

>Hi
>
>My problem is the throttle is as closed as it goes but the engine still runs
>very slowely.
>
>Oliver

If you are certain the throttle is shut it sounds like air leak at the
carb somewhere.
Gotta get air from somewhere to run.

[Mike]

>On Sat, 18 Oct 2003 20:31:03 +0000 (UTC), "Oliver"
><my_first_name_here@raincode.co.uk> wrote:
>
>>Hi
>>
>>My problem is the throttle is as closed as it goes but the engine still runs
>>very slowely.
>>
>>Oliver
>
>If you are certain the throttle is shut it sounds like air leak at the
>carb somewhere.
>Gotta get air from somewhere to run.
>
Some carbs have a throttle stop screw, which acts to stop the carb from cutting
completely. Usually with a helicopter these are wound right out, so the cut is
controlled by the servo.

So, you could have a look and see if you have a screw that doesn't appear to be
doing very much :-)

You could also try running the engine without the servo screw installed (hold
the head, you won't be flying), and then decrease throttle, remove the servo
arm, and physically push the carb lever closed...does it stop now? If it does
you have a linkage problem.

[MPA]

On 19 Oct 2003 20:19:31 GMT, mikespruce99@aol.comnospam (Mike) wrote:

>>On Sat, 18 Oct 2003 20:31:03 +0000 (UTC), "Oliver"
>><my_first_name_here@raincode.co.uk> wrote:
>>
>>>Hi
>>>
>>>My problem is the throttle is as closed as it goes but the engine still runs
>>>very slowely.
>>>
>>>Oliver
>>
>>If you are certain the throttle is shut it sounds like air leak at the
>>carb somewhere.
>>Gotta get air from somewhere to run.
>>
>Some carbs have a throttle stop screw, which acts to stop the carb from cutting
>completely. Usually with a helicopter these are wound right out, so the cut is
>controlled by the servo.
>
>So, you could have a look and see if you have a screw that doesn't appear to be
>doing very much :-)
>
>You could also try running the engine without the servo screw installed (hold
>the head, you won't be flying), and then decrease throttle, remove the servo
>arm, and physically push the carb lever closed...does it stop now? If it does
>you have a linkage problem.

And if not leaves the option of air leak.

[Oliver]

Hi

My carb does have a throttle stop screw, but though i shoudl obay the
instructions and not tutch it. I do recall looking through the carb and it
was visibally open on one side, but as i couldnt see through the other i
thought it was fine.

Ill have a look at this now.

Im sure its not a link problem as the throttle refuses to close any more no
matter what i try.

Thanks for you time guys :)


Oliver


"Mike" <mikespruce99@aol.comnospam> wrote in message
news:20031019161931.15639.00000654@mb-m13.aol.com...
> >On Sat, 18 Oct 2003 20:31:03 +0000 (UTC), "Oliver"
> ><my_first_name_here@raincode.co.uk> wrote:
> >
> >>Hi
> >>
> >>My problem is the throttle is as closed as it goes but the engine still
runs
> >>very slowely.
> >>
> >>Oliver
> >
> >If you are certain the throttle is shut it sounds like air leak at the
> >carb somewhere.
> >Gotta get air from somewhere to run.
> >
> Some carbs have a throttle stop screw, which acts to stop the carb from
cutting
> completely. Usually with a helicopter these are wound right out, so the
cut is
> controlled by the servo.
>
> So, you could have a look and see if you have a screw that doesn't appear
to be
> doing very much :-)
>
> You could also try running the engine without the servo screw installed
(hold
> the head, you won't be flying), and then decrease throttle, remove the
servo
> arm, and physically push the carb lever closed...does it stop now? If it
does
> you have a linkage problem.