REFLECTOR: Stick Force
Joe Ewen
Jewen at comporium.net
Fri Dec 21 14:24:35 CST 2007
Al,
This info is definitely a help, it will give me a starting point. I appreciate the time you spent getting this for me. Hope you have a great holiday as well.
Joe (Completed Bi-Annual this week, flying is like riding a bicycle.)
----- Original Message -----
From: Al Gietzen
To: 'Velocity Aircraft Owners and Builders list'
Sent: Friday, December 21, 2007 11:11 AM
Subject: Re: REFLECTOR: Stick Force
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
To: 'Velocity Aircraft 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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