REFLECTOR: PITCH & ROLL TRIM
Scott Derrick
scott at tnstaafl.net
Sun Oct 24 12:30:21 CDT 2004
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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