..... We are finishing up repairs on the aircraft the FAA ran off the runway this week......
Seat of the pants, after going back and forth from an 84” Catto to the GA, says the GA pulls as hard out of the hole but is considerably faster even on the finest pitch. Also glass smooth if care is taken keeping the pitch and clamshell halves lined up.
One area the Catto may win on is the strength of their nickel leading edge. The stainless leading edge on my GA appears softer or maybe it’s just not as lucky as my Cattos;-)
Maybe Ford will chime in. He’s had a chance to play swap-a-prop on both wheels and floats.
thanks Steve will try thisA little more info on setting prop pitch and torqueing.
Steve,
The most common source of vibration after repitching a propeller is incorrect blade angle.The clamp gap on each side of the blades should be equal prior to setting pitch. A visual check is generally sufficient, but feeler gauges or similar tools may be used if desired.
View attachment 61386
Hand-tighten the clamp and through mount bolts until turning the blades requires some effort to counteract the friction. The blades should be snug but movable with moderate effort. Ensure the clamp gap is kept equal during this process.
After setting the pitch for a blade, tighten the clamp bolts(roughly 1/4 to 1/2 turn) around that blade to ensure it does not change pitch while adjusting the remaining blade. Ensure the clamp gap is kept equal during this process.
View attachment 61387
Torque the 4 mount bolts incrementally to full torque. Applying full torque to 1 bolt prior to tensioning others can rock the mount cover and change pitch of the blades(one blade goes up and one blade goes down).
Torque the 4 clamp bolts incrementally to full torque. Then re-check all bolts. It is common for a clamp bolt to turn another 1/8-1/4 turn after torquing the clamp bolts.
Recheck that clamp gap is approximately equal. You can also use the next pin size down to check that neither blade de-pitched during installation.
Who does FAA authorize to adjust the prop pitch on an aircraft with a standard airworthiness certificate? What, if any, log entries are required?
Just curious because the closest I can legally get to the propeller on my PA-28 is to check/replace the safety wire. I'm not considered competent to remove/replace/torque the bolts that secure its fixed pitch prop.
Those are some little tiny tires!
sj
Keeping my starter and foregoing the shoulder surgery at this point. I'll leave that hand propping to you young bucks.Starter button!? The cub gods are trying to send you a message. You don’t need the button or the starter attached. What you need is a good shoulder surgeon;-)
Add in the comments from the back seat FAA test pilot when the landing isn't so smooth. [emoji38]
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I have had my 82” GA prop for several months, but then I figured once the certification happened (long over due obviously) they would be hard to get. Hence I ordered mine a LONG time ago.I’ve had a few people try and order some for exp, sensnich must be really busy already. They never got back to them.
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Steve why is your gear splayed soooo far OUT??? Can't imagine how far that must tilt those tires when your at GW??? Is that being caused by the shocks not having correct tensions; to hold the weight of the plane?? Not being critical here, just an honest question?
The new Cub looks great.
E
Somewhere in Graham Texas there's a BBQ Grill up on blocks...Those are some little tiny tires!
sj
Steve why is your gear splayed soooo far OUT??? Can't imagine how far that must tilt those tires when your at GW??? Is that being caused by the shocks not having correct tensions; to hold the weight of the plane?? Not being critical here, just an honest question?
The new Cub looks great.
E