pa 18 stabiliser and elevator relationship.
- Thread starter ron
- Start date
mike mcs repair
Registered User
chugiak AK
you need to clarify your terms in your questions....
nose up/down referring to the plane traveling?, or the elevator/stabilizer themselves?.....???
opposite positions.....
nose up/down referring to the plane traveling?, or the elevator/stabilizer themselves?.....???
opposite positions.....
cubdriver2
FRIEND
upstate NY
Nose up on stab referring to the aircraft trim indicator,or if you like the leading edge of the stab fully down .
Thanks PerryB.I understand when trimmed in flight this is the objective.When not flying I cannot figure out where the elevator stab relationship should be.As Glen indicated it depends on the bungee tension.BUT what is the ideal.My aircraft is very heavy on the elevator at approach speeds with full nose up stab.I was wondering if this has something to do with this problem.
skywagon8a
MEMBER
SE Mass MA6
What loaded CG are you making this observation? If the plane is loaded towards the forward CG limit, this would be expected.
Steve Pierce
BENEFACTOR
Graham, TX
Do you have the bungee spring on the top and bottom? The bottom spring was used on older Super Cubs and was later eliminated. If it is installed it would make the elevator heavy on approach. Cub Crafters 2300 gross weight increase requires the bottom bungee spring.
Hi Steve,have removed the bottom one.
Thanks PerryB,I suspect this is how it should be statically set?
Hi Pete,think we have discussed aspects before.With even two pilots and half fuel one is still having to apply nose up elevator with full nose up stab on finals (40 mph)
skywagon8a
MEMBER
SE Mass MA6
Ron, Is your trim installed like this?
Or like this?
The second one is correct.
Or like this?
The second one is correct.
supercub24a
Registered User
Ron if all parts are installed correctly sounds like you have checked that then you put stabilizer in neutral position (that’s when aircraft is level stabilizer is level) the upper bungie spring and cable is at proper length so that elevators are level also then check if you have proper stabilizer travel up and down this is “control surface movement” (2 1/2 degrees up +\- 1/2) (4 degrees down +\- 1/2)
Thanks supercub24a,all checked as per your post. Maybe just put a bag of sand in the boot!
adamgrenda
Registered User
King Salmon, AK
Steve Pierce
BENEFACTOR
Graham, TX
Later airplanes don't have the fittings for it welded to the fuselage since it wasn't needed.
