ddw55(at)hotmail.com
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 Posted: Wed Feb 18, 2009 11:22 pm Post subject: Engine stop / propeller stop - need opinions please |
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Hi Buz C
you mentioned in your e-mail below Nick has a tool to very accurately set the incidence.
How does it work? Any pictures available?
Regards
Daniel
From: N1BZRich(at)aol.com
Date: Wed C 18 Feb 2009 23:03:35 -0500
Subject: Re: Engine stop / propeller stop - need opinions please
To: lightning-list(at)matronics.com
Hi Charles C
Good to hear you are flying your jet and hopefully having a ball. The things you mentioned are pretty easy to fix. First C for the prop to stop turning that quickly is normal - for two reasons. First C whether you have a wooden Sensenich or the carbon fiber one C 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 C since you are at a pretty slow airspeed on final C with the engine compression working against the airspeed on the prop C the prop will stop quickly.
And as you surmised C 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 C 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 C 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 C 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 C 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 C 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 C raise the flap on the right side. Many Lightnings have had to do the flap adjustment C 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 C 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 C but when that doesn't work C 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 C 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
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