REFLECTOR: Elevator Trim Spring

[Ron Brown]

John,

I don't think you will need more travel if you use the unmodified factory ? 
shaped spring installed per the manual

You'll just need to adjust its location to get the amount of up and down 
trim needed for your plane.

Ronnie



----- Original Message ----- 
From: "John Dibble" <aminetech at bluefrog.com>
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Sent: Tuesday, January 31, 2006 6:56 PM
Subject: Re: REFLECTOR: Elevator Trim Spring


> Where can I get an actuator with more travel?
>
> John
>
> Scott Baker wrote:
>
>> While its interesting to think about the benefits of variable geometric
>> wings, canards, and winglets - lets remember the practical elements of
>> system design as it applies to weight, complexity of design and 
>> maintenance,
>> and of course cost.  The Beech Starship had a base list price of $3.9M 
>> when
>> it was introduced in 1989.  There are lots of cool things that would be 
>> fun
>> to try - given relief from $$ constraints.  The subject of pitch-trim has
>> been discussed on the Reflector off and on in the past.  The basic linear
>> actuator/fiberglass spring system works well to my liking.  I happen to
>> think it is one of the finer flying attributes of the Velocity.  If an
>> aircraft does not have enough pitch trim (in cruise or in slow flight) 
>> the
>> answer in most instances is to re-mount (adjust the location) of the 
>> linear
>> actuator so that it gives the needed travel.  Sometimes the fiberglass
>> spring needs stiffening - this can be done by adding a few plies of 
>> glass -
>> or replacing the spring with a new one from the factory.  A few builders
>> have installed linear actuators with an additional inch of travel (in 
>> order
>> to get enough up _and_ down trim).
>> Scott Baker
>>
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