REFLECTOR: Elevator Trim Spring
Alex Balic
alex157 at pwhome.com
Mon Jan 30 17:49:21 CST 2006
How about just adjusting the incidence of the canard- not making it
adjustable, just changing it fro this particular aircraft- seems like it
might be a tad out of whack......
-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Scott Derrick
Sent: Monday, January 30, 2006 3:12 PM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Elevator Trim Spring
This is what Beech did to the Starship and it help bankrupt the project.
There is a huge difference between an articulating tail(non-lifting)
surface on a conventional aircraft and an articulating lifting surface.
Scott
Andy Millin wrote:
> I suppose you could if you wanted to experiment.
>
> I'm not an aerodynamic engineer. Just some thoughts.
>
> It would make it difficult to seal the doghouse. Would be cold and windy.
>
> Would need to find a way to attach and balance the whole canard. Attach
> points would probably need to go right about where the middle of the spar
> cap is now. But, you could find a new attach if you wanted to work at it.
>
> Would be quite a bit of mass to move around with the controls.
>
> The canard provides a significant amount of the lift. Small changes in
> incidence would probably translate into large changes in pitch. Would
want
> to have plenty of mechanical advantage to keep it from slamming to the
> stops.
>
> If you screw it up, you'll probably only get one chance at it.
>
> Not my cup of tea.
>
> Andy
>
> -----Original Message-----
> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
> Behalf Of Andrew Ellzey
> Sent: Monday, January 30, 2006 2:55 PM
> To: Velocity Aircraft Owners and Builders list
> Subject: Re: REFLECTOR: Elevator Trim Spring
>
>
> Just a thought for everyone, not that we need to reinvent the wheel. Why
> couldn't the angle of attack of the canard be made adjustable for trim,
just
>
> like Mooney's tails are made to pivot for pitch trim. There isn't any
> additional drag induced at any trim settings with the Mooney's tail
> configuration.
>
> Andy
>
> ----- Original Message -----
> From: "Scott Derrick" <scott at tnstaafl.net>
> To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
> Sent: Monday, January 30, 2006 1:02 PM
> Subject: Re: REFLECTOR: Elevator Trim Spring
>
>
>
>> John,
>>
>> I wasn't suggesting you use a shim block, you get to do whatever you
>> want
>> to. though I got the idea from a factory A&P.
>>
>> I was asking Ron why he chose to move the actuator when adding a shim
>> block seems much simpler and accomplishes the same thing in my mind.
>> Maybe I'm missing some aspect that moving the actuator accomplishes?
>>
>> Scott
>>
>> John Dibble wrote:
>>
>>> Ronnie,
>>>
>>> I'm sorry, but I'm getting more confused. My problem is that I don't
>>> have enough down
>>> (elevator up) trim at cruise. I can see how moving the actuator forward
>>> could help
>>> this problem. I don't understand why I need to cut the bracket. Can't
I
>>>
>
>
>>> simply move
>>> it forward and make new holes in the canard? I didn't build so maybe
>>> that is why I
>>> don't understand.
>>>
>>> Scott D - I think your idea of the block is going to send me in the
>>> wrong
>>> direction.
>>> Appreciate your help here.
>>>
>>> John
>>>
>>> Ron Brown wrote:
>>>
>>>
>>>
>>>> Morning John,
>>>>
>>>> No, lets try again.
>>>>
>>>> The objective is to move the actuator forward a bit which provides
>>>> more
>>>> up
>>>> (elevator down) trim. (That is if you have a problem with not enough
>>>> "up"
>>>> trim when in cruise configuration, only one person in front seats.
This
>>>> solution allowed me to not only cruise without pushing forward on the
>>>> stick,
>>>> but also to trim for a 500 fpm descent with a slight reduction in
>>>> power).
>>>>
>>>> To move the actuator forward, you will need to cut the canard attach
>>>> bracket
>>>> so that the hole is gone. Now drill a new hole that is 1/4" to 3/8"
>>>> forward
>>>> of where the old hole was.
>>>>
>>>> By the way, the bracket shown in the new on-line manual is different
>>>> from my
>>>> 1999 kit. The new bracket (Long Bracket VAB-02) shown on page 10-8 of
>>>> the
>>>> online manuals is shorter than mine. What ever bracket you have, the
>>>> objective is to move the forward part of the actuator about 3/8" toward
>>>> the
>>>> nose of the plane.
>>>>
>>>> Ronnie Brown
>>>>
>>>> ----- Original Message -----
>>>> From: <aminetech at bluefrog.com>
>>>> To: <reflector at tvbf.org>
>>>> Sent: Sunday, January 29, 2006 10:03 PM
>>>> Subject: Re: REFLECTOR: Elevator Trim Spring
>>>>
>>>>
>>>>
>>>>> Ok. Let's see if I got this. You're talking about the bracket
>>>>> that attached the actuator to the canard? And you shortened the
>>>>> bracket so you could move it aft? And then
>>>>> you drilled a new hole in to bracket and attached to the old aft hole
>>>>> in
>>>>> the canard?
>>>>> Did you drill a new forward hole in the canard for the other bolt?
How
>>>>>
>
>
>>>>> am
>>>>> I doing?
>>>>>
>>>>> John
>>>>>
>>>>> Ron Brown wrote:
>>>>>
>>>>> John,
>>>>>
>>>>> I had the same problem with my 173.
>>>>>
>>>>> I cut the trim actuator front mounting bracket off at the front of
>>>>> the old bolt hole.
>>>>>
>>>>> Then I drilled a new hole about 1/4" or 3/8" ahead of the old
>>>>> hole. Problem fixed, and I still have plenty of up trim for take
>>>>> off. Easy fix.
>>>>>
>>>>> Ronnie
>>>>>
>>>>> ----- Original Message -----
>>>>> From: "John Dibble" <aminetech at bluefrog.com>
>>>>> To: "Velocity Aircraft Owners and Builders list"
>>>>> <reflector at tvbf.org>
>>>>> Sent: Sunday, January 29, 2006 3:11 PM
>>>>> Subject: REFLECTOR: Elevator Trim Spring
>>>>>
>>>>> > Flying solo, I run out of down trim at 155 IAS. On the other
>>>>> hand I > have plenty of up trim for TOL. Can I make a wedge shim
>>>>> where the > spring attaches to the elevator tube to shift the
>>>>> adjustment range to > more down and less up, or do I simply have
>>>>> to add more glass to the > spring to make it stiffer?
>>>>> >
>>>>> > John
>>>>> >
>>>>> > _______________________________________________
>>>>> > To change your email address, visit
>>>>> > http://www.tvbf.org/mailman/listinfo/reflector
>>>>> >
>>>>> > Visit the gallery! www.tvbf.org/gallery
>>>>> > user:pw = tvbf:jamaicangoose
>>>>> > Check new archives: www.tvbf.org/pipermail
>>>>> > Check old archives:
>>>>> http://www.tvbf.org/archives/velocity/maillist.html
>>>>> >
>>>>>
>>>>> _______________________________________________
>>>>> To change your email address, visit
>>>>> http://www.tvbf.org/mailman/listinfo/reflector
>>>>>
>>>>> Visit the gallery! www.tvbf.org/gallery
>>>>> user:pw = tvbf:jamaicangoose
>>>>> Check new archives: www.tvbf.org/pipermail
>>>>> Check old archives:
>>>>> http://www.tvbf.org/archives/velocity/maillist.html
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> To change your email address, visit
>>>>> http://www.tvbf.org/mailman/listinfo/reflector
>>>>>
>>>>> Visit the gallery! www.tvbf.org/gallery
>>>>> user:pw = tvbf:jamaicangoose
>>>>> Check new archives: www.tvbf.org/pipermail
>>>>> Check old archives:
>>>>> http://www.tvbf.org/archives/velocity/maillist.html
>>>>>
>>>>>
>>>> _______________________________________________
>>>> To change your email address, visit
>>>> http://www.tvbf.org/mailman/listinfo/reflector
>>>>
>>>> Visit the gallery! www.tvbf.org/gallery
>>>> user:pw = tvbf:jamaicangoose
>>>> Check new archives: www.tvbf.org/pipermail
>>>> Check old archives:
>>>> http://www.tvbf.org/archives/velocity/maillist.html
>>>>
>>>>
>>> _______________________________________________
>>> To change your email address, visit
>>> http://www.tvbf.org/mailman/listinfo/reflector
>>>
>>> Visit the gallery! www.tvbf.org/gallery
>>> user:pw = tvbf:jamaicangoose
>>> Check new archives: www.tvbf.org/pipermail
>>> Check old archives:
>>> http://www.tvbf.org/archives/velocity/maillist.html
>>>
>>>
>>>
>>>
>>>
>> _______________________________________________
>> To change your email address, visit
>> http://www.tvbf.org/mailman/listinfo/reflector
>>
>> Visit the gallery! www.tvbf.org/gallery
>> user:pw = tvbf:jamaicangoose
>> Check new archives: www.tvbf.org/pipermail
>> Check old archives:
>> http://www.tvbf.org/archives/velocity/maillist.html
>>
>
> _______________________________________________
> To change your email address, visit
> http://www.tvbf.org/mailman/listinfo/reflector
>
> Visit the gallery! www.tvbf.org/gallery
> user:pw = tvbf:jamaicangoose
> Check new archives: www.tvbf.org/pipermail
> Check old archives: http://www.tvbf.org/archives/velocity/maillist.html
>
> _______________________________________________
> To change your email address, visit
http://www.tvbf.org/mailman/listinfo/reflector
>
> Visit the gallery! www.tvbf.org/gallery
> user:pw =vbf:jamaicangoose
> Check new archives: www.tvbf.org/pipermail
> Check old archives: http://www.tvbf.org/archives/velocity/maillist.html
>
>
>
>
_______________________________________________
To change your email address, visit
http://www.tvbf.org/mailman/listinfo/reflector
Visit the gallery! www.tvbf.org/gallery
user:pw = tvbf:jamaicangoose
Check new archives: www.tvbf.org/pipermail
Check old archives: http://www.tvbf.org/archives/velocity/maillist.html
More information about the Reflector
mailing list