Today's Message Index:
----------------------
1. 07:25 PM - Engine stop / propeller stop - need opinions please (Charles Dewey)
2. 08:06 PM - Re: Engine stop / propeller stop - need opinions please (N1BZRich@AOL.COM)
3. 11:22 PM - Re: Engine stop / propeller stop - need opinions please (Daniel DW)
Message 1
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| Subject: | Engine stop / propeller stop - need opinions please |
My Jabiru 3300 engine died on final the other day when coming down from full throttle
to low throttle... interesting note- the propeller stopped dead in its
tracks- unlike most planes where the prop keeps spinning after stopping- is this
normal? Is the engine dying on low throttle just a matter of adjusting the
idle up? I*'d like to keep the engine from cutting off in the future... By the
way, the engine did start right up after landing- the landing was done with
the engine off...also...anyone experience any problems with their Lightning pulling
to the left or right (not flying hands off?). Mine is pulling (banking)
to the left...need opinions on how to correct that as well... Thanks Charles
--- On Fri, 2/13/09, Wayne Lenox <waynelenox@juno.com> wrote:
> From: Wayne Lenox <waynelenox@juno.com>
> Subject: Re: Lightning-List: LAKESIDE LIGHTNING SHOW AND TELL
> To: lightning-list@matronics.com
> Date: Friday, February 13, 2009, 10:02 PM
> Lightning fly-in starts at 9:00 AM Tomorrow at lakeside.
> See you then.
> Wayne
>
> ____________________________________________________________
> Make money while staying at home. Click here for
> information on top-notch home businesses.
> http://thirdpartyoffers.juno.com/TGL2141/fc/PnY6rw1SEY9YouG90bcuK7Ils8y71U710CDcP1IwExrVKshcCV2JF/
Message 2
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| Subject: | Re: Engine stop / propeller stop - need opinions please |
Hi Charles,
Good to hear you are flying your jet and hopefully having a ball. The
things you mentioned are pretty easy to fix. First, for the prop to stop
turning that quickly is normal - for two reasons. First, whether you have a
wooden Sensenich or the carbon fiber one, it is lighter than the metal props you
are use to flying with. The light prop doesn't have as much inertia to keep
it turning or wind milling when the engine stops. Also, since you are at a
pretty slow airspeed on final, with the engine compression working against the
airspeed on the prop, the prop will stop quickly.
And as you surmised, making sure the idle is adjusted correctly is very
important. Another thing to check is to make sure when you do pull the
throttle to idle, that you don't actually pull too hard. Pulling too hard is
sometimes easy to do if you have the throttle friction set too high or too low.
Also, you might want to put a second collar stop on the throttle cable at the
carb end as Mark suggested some time ago.
The airplane wanting to turn (left or right) when hands off is also not
unusual. First, check your ball to make sure you don't have a rudder yaw
problem. But most likely yours turning left just means that when the wings were
installed and the incidence set, the right wing was set at a very slightly
higher angle of incidence than the left one. Your airplane was probably built
before Nick came up with the tool to very accurately set the incidence.
Prior to that tool, the guys just aligned the wings with the "karmen" on the
fuselage (the wing butt outline) and that was sometimes not accurate enough.
The fix is relatively easy - just lower the flap on the left wing slightly by
adjusting the left side flap push rod. Or if you can, raise the flap on the
right side. Many Lightnings have had to do the flap adjustment, so your are
not alone. My Esaual was the same way.
One other comment since I mentioned the yaw or ball centered situation
above. As far as yaw or rudder trim, you want the ball to be centered at the
speed you use most of the time for cruise. Slower than that speed or faster
than that speed will send the ball out slightly to one side or the other.
You can adjust most yaw situations by tightning up a rudder cable, but when
that doesn't work, a small rudder trim tab can be used. Linda has a very
effective and not even noticeable tab on her rudder. I will try to get a photo
of
it for a future newsletter, but it is a small wedge shaped strip that is
currently taped to the trailing edge of the rudder. Works great. It is
something that we used to use in the aerobatic world on the Pitts Special.
Good luck with your flying.
Buz
**************Need a job? Find an employment agency near you.
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Message 3
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| Subject: | Engine stop / propeller stop - need opinions please |
Hi Buz=2C
you mentioned in your e-mail below Nick has a tool to very accurately set t
he incidence.
How does it work? Any pictures available?
Regards
Daniel
From: N1BZRich@aol.com
Subject: Re: Lightning-List: Engine stop / propeller stop - need opinions p
lease
Hi Charles=2C
Good to hear you are flying your jet and hopefully having a ball. The
things you mentioned are pretty easy to fix. First=2C for the prop to stop
turning that quickly is normal - for two reasons. First=2C whether you ha
ve a wooden Sensenich or the carbon fiber one=2C it is lighter than the met
al props you are use to flying with. The light prop doesn't have as much i
nertia to keep it turning or wind milling when the engine stops. Also=2C s
ince you are at a pretty slow airspeed on final=2C with the engine compress
ion working against the airspeed on the prop=2C the prop will stop quickly.
And as you surmised=2C making sure the idle is adjusted correctly is ve
ry important. Another thing to check is to make sure when you do pull the
throttle to idle=2C that you don't actually pull too hard. Pulling too har
d is sometimes easy to do if you have the throttle friction set too high or
too low. Also=2C you might want to put a second collar stop on the thrott
le cable at the carb end as Mark suggested some time ago.
The airplane wanting to turn (left or right) when hands off is also not
unusual. First=2C check your ball to make sure you don't have a rudder ya
w problem. But most likely yours turning left just means that when the win
gs were installed and the incidence set=2C the right wing was set at a very
slightly higher angle of incidence than the left one. Your airplane was p
robably built before Nick came up with the tool to very accurately set the
incidence. Prior to that tool=2C the guys just aligned the wings with the
"karmen" on the fuselage (the wing butt outline) and that was sometimes not
accurate enough. The fix is relatively easy - just lower the flap on the
left wing slightly by adjusting the left side flap push rod. Or if you can
=2C raise the flap on the right side. Many Lightnings have had to do the f
lap adjustment=2C so your are not alone. My Esaual was the same way.
One other comment since I mentioned the yaw or ball centered situation
above. As far as yaw or rudder trim=2C you want the ball to be centered at
the speed you use most of the time for cruise. Slower than that speed or
faster than that speed will send the ball out slightly to one side or the o
ther. You can adjust most yaw situations by tightning up a rudder cable=2C
but when that doesn't work=2C a small rudder trim tab can be used. Linda
has a very effective and not even noticeable tab on her rudder. I will try
to get a photo of it for a future newsletter=2C but it is a small wedge sh
aped strip that is currently taped to the trailing edge of the rudder. Wor
ks great. It is something that we used to use in the aerobatic world on th
e Pitts Special.
Good luck with your flying.
Buz
Need a job? Find an employment agency near you.
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