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cdewey6969(at)yahoo.com
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 Posted: Wed Feb 18, 2009 7:25 pm Post subject: Engine stop / propeller stop - need opinions please |
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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(at)juno.com> wrote:
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N1BZRich(at)AOL.COM
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| Posted: Wed Feb 18, 2009 8:06 pm Post subject: Engine stop / propeller stop - need opinions please |
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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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Kayberg(at)aol.com
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| Posted: Thu Feb 19, 2009 4:47 am Post subject: Engine stop / propeller stop - need opinions please |
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In a message dated 2/18/2009 10:27:48 P.M. Eastern Standard Time, cdewey6969(at)yahoo.com writes:
| Quote: | | Mine is pulling (banking) to the left...need opinions on how to correct that as well... |
I know Buz has given you some aerodynamic explanation, but there is another.
Were you the only occupant?
Was you fuel load equal?
If you want it to fly perfectly straight, you have to decide if that will be accomplished solo or dual. Having a body sit on the right would cure the left turn..... if you dont have one now.
Also, if you have unequal fuel load, it will cause a turn, particularly to the left.
I would test fly for that before I changed the flap.
Doug Koenigsberg
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pennington(at)q.com
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| Posted: Thu Feb 19, 2009 4:47 am Post subject: Engine stop / propeller stop - need opinions please |
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<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]--> Good morning Charles
I think most of us have had the engine die on final when pulling off the throttle during the first flight or so. I adjusted my idle up slightly, (875 rpms minimum), and installed the cable stop. I am very surprised that the engines are still going out with the idle set low. In my mind, it could be hazardous.
With respect to the plane pulling left, mine did too. The angle of incidence on my wings is within 1/2 degree of each other and it still yawed and rolled left . However, I must tell you that it depended somewhat on the weight distribution. What I mean is, if I was in the plane by myself, it yawed and rolled. With a passenger, not so much. Also, it varied with speed. I tried adjusting the flaps and ended up with them way out of whack! Not a safe condition...especially when doing stalls. I finally adjusted the flaps and ailerons normally and made a small trim tab for the right aileron and one for the rudder. I used thin aluminum. The first tabs were rather large, (1"x1"x8"). I simply taped them on (temporarily) with Duct Tape.....yes, good old Duct Tape, and then flew with them. I gradually trimmed them down till the plane flew straight and level under my normal flying conditions, i.e. just me in the plane at normal cruise speed. Then, I painted them to match the plane and glued them on with GE Silicone. Note: use the Silicone sparingly for a neat job. To hold them in place till the Silicone cures, use green masking tape and let it cure for 24 hours. They are barely noticeable and work very well.
I hope your flying is the best.
Gary Pennington
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