REFLECTOR: Stick Force

Al Gietzen ALVentures at cox.net
Fri Dec 21 10:11:42 CST 2007


Joe;

 

With the trim set at neutral elevator, at a point on the stick 6” above the
keel; I measured 3 to 3.5 lbs force on the stick to cause about 1” downward
trailing edge deflection of the elevator.  About 5 lbs to deflect 1 ½”.  The
forces pushing the stick forward seemed to be just slightly less – I guess
the ? spring is not quite symmetrical in its response.  At that point on the
stick, it turned out that the movement of the stick and the elevator
deflection were about the same. You’ll have to look at the relative
dimensions from the stick pivot point to get the movement of the pushrod. 

 

No precision in these measurements – calibrated eyeball for the distance,
cheap fish scale for the force.

 

Hope this helps.  Enjoy the Holidays!

 

Al

 

-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Joe Ewen
Sent: Tuesday, December 18, 2007 3:10 PM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Stick Force

 

All,

Thanks for the feedback on the topic, it is appreciated.

 

Al,

I would certainly appreciate any measurements you can make.

 

Thanks,

Joe

 

 

----- Original Message ----- 

From: Al Gietzen <mailto:ALVentures at cox.net>  

To: 'Velocity Aircraft <mailto:reflector at tvbf.org>  Owners and Builders
list' 

Sent: Tuesday, December 18, 2007 11:30 AM

Subject: Re: REFLECTOR: Stick Force

 

Subject: REFLECTOR: Stick Force

 

Has anyone measured the force on the control stick in flight?  If not does
anyone have an estimate on the force the trim spring applies or the force
required to make a control deflection.  I can not use the factory trim
spring, there is no room left behind the panel for it.  I think I have a
concept that will work, I just need to calculate the spring force and rate.
All help is appreciated.

Thanks,

Joe

Joe;

 

I’ll be at the airport sometime in the next few days, and can get an
approximate measurement on my plane for you if that would still be useful.
I narrowed the original factory spring to reduce the force to make it
possible to get near full deflection in one direction while the trim motor
was run to the extreme in the opposite direction.  Basically the idea is
that if the motor ran to full down trim (elevator up) for whatever reason
(such a case has been reported here), it would still be possible for a
fairly strong arm to pull back far enough (elevator down) for a good
landing.  The resulting spring is about 1 ½” wide, and gives a good stick
feel and trim control. 

 

I assumed that it would take nearly full down deflection for landing, but in
fact on my plane with the Wingco canard I’m sure I never use full
deflection; and generally find I have trimmed to about 1” down.  

 

Al


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