REFLECTOR: Elevator Trim Spring
steve korney
s_korney at hotmail.com
Wed Feb 1 11:29:27 CST 2006
Guys.....
The sparrow strainer takes care of the trim in cruise and top speed... If
it's set right...
Best... Steve
----Original Message Follows----
From: Scott Derrick <scott at tnstaafl.net>
Reply-To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
Subject: Re: REFLECTOR: Elevator Trim Spring
Date: Wed, 01 Feb 2006 08:08:24 -0700
I can see how he might need more travel.
As my trim is set up, I have just enough down trim to cruise at 65% power
with just me in the front. If its bumpy I don't have enough, I have to
constantly give it a shove forward or use George. If have two in the front
I don't have enough up trim for a hands off 90 knot approach, just me its
fine. If I fix it so I can fly a 90 knot approach hands off with two, I'd
loose my hands off cruise trim setting.
So as Scott B. said, I could possibly stiffen up the spring, I don't like
this option because I think it would be hard enough trying to fly it with
an inoperative trim system as it is, any stiffer and I'd be out of muscle
pretty fast. Or I could use a trim actuator with more travel. I had not
considered that and will have to think about it.
However I do like the design of the Strong Pitch Trim system and would
welcome the added space behind the panel if I removed the fiberglass spring
trim system. Strong now has a PWM controller for his trim system for fine
pitch adjustments at fast speeds. A problem I partially solved on the
original system with a electric brake.
Scott
Ron Brown wrote:
>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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>
>_______________________________________________
>To change your email address, visit
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>
>
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