Acro Image

Aerobatics Server

ACRO E-mail Archive Thread: [Acro] RE: Alternate modes of spin recovery

[International Aerobatic Club] [Communications] [Aerobatics Images]

Disclaimer: These aerobatics pages are developed by individual IAC members and do not represent official IAC policy or opinion.

[Usage Statistics]

ACRO E-mail Archive Thread: [Acro] RE: Alternate modes of spin recovery


Thread: [Acro] RE: Alternate modes of spin recovery

Message: [Acro] RE: Alternate modes of spin recovery

Follow-Up To: ACRO Email list (for List Members only)

From: mike.torbett at

Date: Mon, 22 Jul 2002 21:57:09 UTC


    When I was practicing rudder-less spin recovery I was keeping my feet
off of the pedal and did not try to account for the effect the rudder return
spring might have. That would be easy to test however as on the 2A the
cables run right by my hands. I could easily grab one and pull on it to
relieve the spring tension and thus simulate the effect of a broken cable.
As you say though, the springs as weak and exert little force - I would be
surprised if they made any difference but its easy enough to verify. 
    Actually, I think this is exactly the kind of thing you should try at
home !
Best regards,

-----Original Message-----
From: DSowder at [mailto:DSowder at]
Sent: Monday, July 22, 2002 2:44 PM
To: mike.torbett at; acro at
Subject: Re: [Acro] Alternate modes of spin recovery

In a message dated 7/22/02 8:15:58 AM Pacific Daylight Time,
mike.torbett at writes:

I said to myself at the time that after I
got my plane flying again I would go up and experiment with spin recovery
without using any rudder.

I am curios to know how you dealt with the rudder pedal return springs when
simulating a broken rudder cable. It's true that these springs are weak, but
they do provide a small amount of centering tendency. And, if a cable is
broken, only the spring on the good side will be active, providing a small
amount of pro-spin rudder. In other words, simply taking your feet off the
pedals doesn't simulate a broken rudder cable, even if you're already

Another possible factor would be the position of the tailwheel and the
friction in it's pivot, which could affect the force that the tailwheel
springs apply to the rudder. Just some thoughts along the lines of "don't
try this at home...."

Doug Sowder 


© Dr. Günther Eichhorn
Email Guenther Eichhorn