Skip to main content

Banking tendency during takeoff; strut problem, or...?

My '65 Deb (C33) has been "banking" to the left during the takeoff roll. IOW, it feels like there's either a blistering crosswind from the right (there isn't) or the left strut is completely bottoming out. Also, there's no additional drifting to the left beyond the usual torque/P-factor tendency which is easily counteracted by rudder.

The struts look normal on the preflight (3-4 inches of extension) and after liftoff all is normal. Is it struts, an overweight pilot or something else?

Model: Debonair 35-C33
Aircraft Serial Number: CD-963
Posted 11/7/2023 - 3 months ago
|

Replies Sort

I'd be inclined to make sure the struts have the correct amount of 5606 fluid in them, then service with Nitrogen.

Mike
ABS Technical Advisor

Posted 11/7/2023 - 3 months ago
|
Quote

With control wheel level, verify that the aileron trailing edge lines up with trailing edge of flaps and both flap trailing edge are even with bottom of fuselage.
If everything does not line up check your ailerons first to ensure the screws are in the attach brackets and not just through the aileron. It is very easy to miss the bracket when reinstalling an aileron.

Bob Ripley
ABS Technical Advisor

Posted 11/7/2023 - 3 months ago
|
Quote

By "banking" do you mean wanting to head to the left, on take off?

This behavior may be the result of your engine. Does your aircraft have it's original engine? Or have you (or someone else) "upgraded" the engine to a more powerful engine?

I suspect that your aircraft's behavior is secondary to "P" factor. You can investigate this by searching for "P" factor.

Essentially, this factor occurs when you are applying full power too quickly on take off or when making a go around. In other words, discontinue shoving the throttle in so fast during take off.

Oh, you will find that this problem does not occur when you are departing with a cross wind from the right.

Most newer Bonanzas have their engine canted to the right a bit to counter this problem.

Recently a Cirrus was landing at my home airport which ended in a crash, without killing the passengers. He was landing and suddenly encountered a cross wind. Shortly after his crash, I was talking to a fellow who said that he did not know someone was landing. Then he heard the sound of an engine producing a lot of power followed immediately by sudden silence.

I think that the sudden power sound was the pilot shoving in the throttle very fast. The sudden loss of sound was the result of the left wing striking the ground followed by the engine's prop hitting the ground. In other words, if the fellow had been a few more feet into the air, he and his passenger would have been killed by the "P" factor's affect on the aircraft.

Tom

Posted 11/8/2023 - 3 months ago
|
Quote

"By "banking" do you mean wanting to head to the left, on take off?"

No, there's just the usual tendency to drift left when power is applied, which is easily counteracted by a bit of right rudder pressure. I'm feeling like I'm rolling down the runway in about a five-degree left bank; like the left main gear strut has totally "bottomed out." It's really uncomfortable, similar to the feeling you get during uncoordinated flight with the ball way out of center.

After liftoff everything feels normal.

Posted 11/12/2023 - 3 months ago
|
Quote

Is this a change from prior flights?

Have you flown in another Bonanza recently? does the same thing occur in that airplane?

If this is a new thing, I would seriously check both of the landing gears.

Elevate your airplane on jacks. Then open the ABS booklet about the landing gear. Now let the air out of both of the main struts. Remove the valve cores. Then, with the valve out of the strut, lift up a wheel and observe when oil comes out of the top of the valve. Do this with the other side.

I suspect that one strut is low on hydraulic fluid.

You might want to remove both struts and send them to Delta Strut for rebuilding (They do a wonderful job).

Tom

Posted 11/15/2023 - 3 months ago
|
Quote

Banking tendency during takeoff; strut problem, or...?