Headspeed Problems...(Shuttle).

[Bobby Bee]

Hi Guys,



I have a problem in achieving a consistent head speed, on two different
Shuttles, from one flight to the next. I would very much appreciate your
experience in helping me to understand what is going on.



I have 2 Hirobo Shuttles. The first is a 2year old ZTS with bearing
upgrade and has an OS32SX with a Zimmerman muffler. The other is a brand new
ZTS Plus with no bearing upgrade and runs an OS32SX with the original kit
silencer. Both engines use Coolpower 10% fuel. Neither model has been
crashed.



When I set the half stick hovering head speed of the ZTS to say 1600rpm,
then do a full stick climb out in order to set the top end pitch, or indeed
just fly a circuit or two then land, all seems and sounds OK. Should I then
takeoff again and go into a hover, the head speed is not that which was
previously set. It has, on occasion, reduced to as low as 1200rpm whilst
hovering for this second time, but, it is never the same on any two
consecutive flights. Normal mode is -1 +5 +9, and idle-up 1 is -3 +5 +9 at
present. Tracking is spot on.



I have since tried the same tests with the new ZTS Plus, and get similar
results, but the rpm difference between flights is not quite as much.



The only component that is used with both helicopters is the
transmitter, a JR X3810. The engine silencers are different, as stated above
and the blades on bothe helicopters are aftermarket wooden types. The
original wood Hirobo blades were not used on either model because they were
warped out of the box.



Is it possible to achieve a consistent head speed with a Shuttle?...
Please help.



In desperation. Bobby Bee.

[Mike]

>Subject: Headspeed Problems...(Shuttle).
>From: "Bobby Bee" rob.flyboy@btinternet.com
>Date: 01/11/03 14:45 GMT Standard Time
>Message-id: <bo0gum$76n$1@sparta.btinternet.com>
>
> Hi Guys,
>
>
>
> I have a problem in achieving a consistent head speed, on two different
>Shuttles, from one flight to the next. I would very much appreciate your
>experience in helping me to understand what is going on.
>
>
>
> I have 2 Hirobo Shuttles. The first is a 2year old ZTS with bearing
>upgrade and has an OS32SX with a Zimmerman muffler. The other is a brand new
>ZTS Plus with no bearing upgrade and runs an OS32SX with the original kit
>silencer. Both engines use Coolpower 10% fuel. Neither model has been
>crashed.
>
>
>
> When I set the half stick hovering head speed of the ZTS to say 1600rpm,
>then do a full stick climb out in order to set the top end pitch, or indeed
>just fly a circuit or two then land, all seems and sounds OK. Should I then
>takeoff again and go into a hover, the head speed is not that which was
>previously set. It has, on occasion, reduced to as low as 1200rpm whilst
>hovering for this second time, but, it is never the same on any two
>consecutive flights. Normal mode is -1 +5 +9, and idle-up 1 is -3 +5 +9 at
>present. Tracking is spot on.
>
>
>
> I have since tried the same tests with the new ZTS Plus, and get similar
>results, but the rpm difference between flights is not quite as much.
>
>
My first thought when reading this one was that the mixture setting may be a
bit lean.. i would richen it up until the heli wont run properly, then weaken
it by a couple of clicks.. see what happens.
Sorry for short reply, dog barking to go out :-)

[Bobby Bee]

Thanks for your reply Mike,

I believe the mixture is ok as I have setup both heli's engines on
headloaders and have definitely gone for the "slightly richer" setting.
There is a healthy amount of smoke being produced.
(I've been r/c flying for some 30years but only 2years or so with
helicopters...)

Cheers...BB

"Mike" <mikespruce99@aol.comnospam> wrote in message
news:20031101132404.20427.00000053@mb-m17.aol.com...
> >Subject: Headspeed Problems...(Shuttle).
> >From: "Bobby Bee" rob.flyboy@btinternet.com
> >Date: 01/11/03 14:45 GMT Standard Time
> >Message-id: <bo0gum$76n$1@sparta.btinternet.com>
> >
> > Hi Guys,
> >
> >
> >
> > I have a problem in achieving a consistent head speed, on two
different
> >Shuttles, from one flight to the next. I would very much appreciate your
> >experience in helping me to understand what is going on.
> >
> >
> >
> > I have 2 Hirobo Shuttles. The first is a 2year old ZTS with bearing
> >upgrade and has an OS32SX with a Zimmerman muffler. The other is a brand
new
> >ZTS Plus with no bearing upgrade and runs an OS32SX with the original kit
> >silencer. Both engines use Coolpower 10% fuel. Neither model has been
> >crashed.
> >
> >
> >
> > When I set the half stick hovering head speed of the ZTS to say
1600rpm,
> >then do a full stick climb out in order to set the top end pitch, or
indeed
> >just fly a circuit or two then land, all seems and sounds OK. Should I
then
> >takeoff again and go into a hover, the head speed is not that which was
> >previously set. It has, on occasion, reduced to as low as 1200rpm whilst
> >hovering for this second time, but, it is never the same on any two
> >consecutive flights. Normal mode is -1 +5 +9, and idle-up 1 is -3 +5 +9
at
> >present. Tracking is spot on.
> >
> >
> >
> > I have since tried the same tests with the new ZTS Plus, and get
similar
> >results, but the rpm difference between flights is not quite as much.
> >
> >
> My first thought when reading this one was that the mixture setting may be
a
> bit lean.. i would richen it up until the heli wont run properly, then
weaken
> it by a couple of clicks.. see what happens.
> Sorry for short reply, dog barking to go out :-)
>