REFLECTOR: PITCH & ROLL TRIM
Dave T Nelson
dtnelson at us.ibm.com
Mon Oct 25 09:56:14 CDT 2004
The spring assembly is an integral part of the Strong pitch trim system.
It is part of the component you purchase from Alex Strong.
Hope this helps.
Dave
Dave T. Nelson
T/L 553-4327, 507-253-4327
Scott Derrick
<scott at tnstaafl.n
et> To
"Velocity Aircraft Owners and
10/24/2004 12:30 Builders list" <reflector at tvbf.org>
PM cc
Dave T Nelson/Rochester/IBM at IBMUS
Subject
Re: REFLECTOR: PITCH & ROLL TRIM
What's the spring assembly? Homemade? part number? manufacturer?
>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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>>_______________________________________________
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>
>
>
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>To change your email address, visit
>http://www.tvbf.org/mailman/listinfo/reflector
>
>Visit the gallery! www.tvbf.org/gallery
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>Check new archives: www.tvbf.org/pipermail
>Check old archives: http://www.tvbf.org/archives/velocity/maillist.html
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