REFLECTOR: PITCH & ROLL TRIM

Sun Oct 24 11:44:20 CDT 2004

Unfortunately, I'm not keeping a close enough eye on my email, & just
spotted this - sorry for the delay.

I've attached a drawing of how I installed it in the center section console.

Take a look and then feel free to e-mail me questions at my business address
(dtnelson at us.ibm.com).  I stay on top of that address.  I'm just leaving for
a week long business trip, but feel free to call me when I return.  My
number is 507-281-0469.

Sorry for the short note - I'd be happy to help if I can!

Dave
----- Original Message ----- 
From: "Brett Ferrell" <bferrell at 123mail.net>
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>; 
"DaveNelson" <davenali at charter.net>
Sent: Wednesday, October 20, 2004 2:47 PM
Subject: Re: REFLECTOR: PITCH & ROLL TRIM

> Dave,
>
> I don't suppose you could take a snapshot or two of that Strong system in 
> your
> plane for us?  I'm intersted in saving some space as well, and I'll also 
> like
> to hook a trim indicator up on the elevator, and I think this may be the 
> way to
> go, but looking at the website, I'm not entirely sure how you've fitted 
> this up
>
> Brett
>
> Quoting Dave Nelson <davenali at charter.net>:
>
>> Re: REFLECTOR: PITCH & ROLL TRIMI also tried various techniques to 
>> stiffen
>> the standard pitch trim spring setup before I gave up.  Part of the 
>> problem
>> for me was that the standard installation took up room behind the 
>> instrument
>> panel, which is why I worked hard to find an entirely different 
>> alternative.
>>
>> I've got almost 700 hours on my plane.  I started with a pure "standard"
>> installation, went to a modified installation after a significant panel
>> upgrade (which involved inverting the fiberglass spring and stiffening 
>> it),
>> and finally, the Strong pitch trim system.  I've got close to 100  hours 
>> on
>> the new Strong system, including dozens of instrument approaches (where 
>> you
>> really learn if you've got a good pitch trim system!), and I'm extremely
>> pleased with this new setup.  The factory systems never had the authority 
>> and
>> fine control that my new setup does.
>>
>> If your setup is working for you, that's great!  Mine wasn't, and so I 
>> came
>> up with this solution.  Your ideas + mine = more options for the rest of 
>> the
>> community!
>>
>> Thanks.
>>
>> Dave
>>   ----- Original Message -----
>>   From: Stephen Vaughen
>>   To: Velocity Aircraft Owners and Builders list
>>   Sent: Tuesday, October 19, 2004 12:48 AM
>>   Subject: Re: REFLECTOR: PITCH & ROLL TRIM
>>
>>
>>   Dave,
>>
>>
>>   I broke a series of stock pitch trim springs before waking up in the 
>> middle
>> of the night with the answer.  As with so many problems I've ever faced, 
>> the
>> answer was relatively simple, and was staring me right in the face.
>>
>>
>>   The answer was to create a pitch trim spring which was a series of 2 
>> bid
>> layers instead of one solid fiberglass spring.
>>
>>
>>   In other words, imagine the stock pitch trim spring shape and size, but
>> made up of 10 independent layers at 2 bid each.
>>
>>
>>   What happens is that the layers slide against one another and no 
>> individual
>> layer gets over stressed to the point of breaking.  Realize that 2 bid of
>> fiberglass can flex a lot farther without breaking than can a 10 bid 
>> layer.
>> A series of 2 bid layers can achieve the stiffness you want by just 
>> adding
>> more 2 bid layers.
>>
>>
>>   I recall that I found the sweet spot at about 10 layers, 2 bid each. 
>> No
>> more broken pitch trim springs and I have full override movement with
>> adequate stiffness.  You want more or less stiffness, add or remove 2 bid
>> layers.
>>
>>
>>   I mentioned to Scott Swing that I had conquered this problem on my 
>> plane,
>> so I hope that the word gets around.  Scott asked me how I made it, and I
>> told him that I started with the stock pitch trim spring, duct taped one
>> side, laid up 2 bid, covered it with plastic, another 2 bid, another 
>> sheet of
>> plastic, etc., etc.
>>
>>
>>   Come to think of it, it may have been 8 2 bid layers.  I'll count the
>> layers later this week.
>>
>>
>>   I hope this works for you.  Regards
>>
>>
>>   Steve
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>     I agree that the factory pitch trim system leaves alot to be desired.
>> Last winter I worked with Alexis Strong (of Cozy fame) to engineer a 
>> system
>> for my Velocity STD-RG based on his well proven design that's flying in
>> dozens and dozens of EZEs out there.  I've been (slowly... very slowly)
>> putting together an article to describe my results.  In net, working with
>> Alex, we modified the design for my Velocity and I'm very, very pleased 
>> with
>> the results.  I'll try to post more in the next couple of days if 
>> anyone's
>> interested.
>>
>>     Dave
>>
>>       ----- Original Message -----
>>       From: Tom Martino
>>       To: Velocity Email List (E-mail)
>>       Sent: Wednesday, October 13, 2004 9:51 AM
>>       Subject: REFLECTOR: PITCH & ROLL TRIM
>>
>>
>>       I like most everything about the Velocity design except for the 
>> pitch
>> and roll trim.  So I am finally doing something about it.  I am 
>> installing
>> tiny trim servos in the elevator and one aileron and outfitting them with
>> piano hinged trim tabs.  The wires will be run inside the torque tubes. 
>> I am
>> happy to be eliminating that clunky linear activator and the cumbersome
>> fiberglass trim spring on the canard and the string & spring roll trim.
>>
>>       Anyone else ever do this?
>>
>>       BTW - I have forgotten to post the paint designs I promised . but 
>> it's
>> been difficult to get my graphic artist to send me the digitals.  All I 
>> have
>> now are large print-outs.  They should be coming soon.
>>
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