Today's Message Index:
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1. 07:15 AM - Re: Aileron trim-drag question (t41pilot)
2. 10:32 AM - Re: Aileron trim-drag question (t41pilot)
3. 11:46 AM - Re: Re: Aileron trim-drag question (Larry Cottrell)
4. 12:51 PM - Re: Aileron trim-drag question (t41pilot)
5. 01:19 PM - Re: Re: Aileron trim-drag question (Larry Cottrell)
6. 02:49 PM - Re: Re: Aileron trim-drag question (Dana Hague)
Message 1
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Subject: | Re: Aileron trim-drag question |
My Firefly needed aileron trim as well. It was only a problem at full or cruise
throttle settings so may be a P-Factor thing. At reduced throttle and approach
speeds, the ailerons felt fine. I opted for a trim tab because I don't have
much room in my cockpit area. I noticed an immediate improvement. The angle on
the tab was a guess to start with and I just used test flights to get it dialed
in. It's attached with #6 screws right now. I'm pretty much there now and
it ended up at the same angle as my rudder tab. I think it's in the neighborhood
of 22 to 25 degrees. I'll attach it permanently after I paint it....next spring.
It's the dead of winter here right now. My tab is the width of 1 rib bay
but a longer narrower tab could be used and would give more attach points if
you so desired. I was scared while drilling the ribs that the drill bit would
slip and I would ruin my cover job but managed without incident. Just slow
and careful is the rule here with new bullet tip drill bit. In conclusion, I'm
glad I did it. My only regret is that I needed a tab at all. Was it a building
error or P-factor? I'm don't know but am not gointg to worry about it. The
plane flies well now. It's possible I may have lost a mph or 2 but my firefly
is so light and quick that I can't tell for sure since I'm affected by winds
more than you. I have an install picture but am having trouble getting it small
enough to post here. I'll work on that. Meanwhile, I can E-mail one to you
if you are interested.
--------
Gregg Kaat
2011 Firefly
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=392578#392578
Message 2
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Subject: | Re: Aileron trim-drag question |
Here's the pic of my Tab. I'll paint to match in the spring
--------
Gregg Kaat
2011 Firefly
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=392594#392594
Attachments:
http://forums.matronics.com//files/pa270080_837.jpg
Message 3
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Subject: | Re: Aileron trim-drag question |
Fireflies must be different than Firestars, Mine is pointed in the other
direction. You probably should make sure that you need the elevator to go
up or down before you fasten it in a permanent fashion.
Larry
On Fri, Jan 18, 2013 at 11:32 AM, t41pilot <t41pilot@frontier.com> wrote:
>
> Here's the pic of my Tab. I'll paint to match in the spring
>
> --------
> Gregg Kaat
> 2011 Firefly
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=392594#392594
>
>
> Attachments:
>
> http://forums.matronics.com//files/pa270080_837.jpg
>
>
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Subject: | Re: Aileron trim-drag question |
Not sure what you meant by elevator up or down. This is an aileron trim tab. I
determined what direction the ailerons needed to move before I made the tab to
achieve the desired trim. The tab can be mounted up or down as long as the proper
aileron side is chosen to do the type of mount you desire and the aileron
deflects in the direction desired. In my case, I would achieve the same result
with a downward pointing tab mounted on the opposite aileron. It may be a
matter of what is more visually appealing to a person. The plane has already
flown in the current configuration and my trim problem was solved. I just haven't
got it mounted permanently yet. It's possible that a tab may work better
in one configuration as compared with the other but an engineer would have to
help with that. I don't know that answer.
--------
Gregg Kaat
2011 Firefly
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=392599#392599
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Subject: | Re: Aileron trim-drag question |
Oops, I thought that it was an elevator. You are of course correct. ( The
sun was shining on my computer screen and I couldn't see the screen
clearly. You believe that?)
Larry
On Fri, Jan 18, 2013 at 1:51 PM, t41pilot <t41pilot@frontier.com> wrote:
>
> Not sure what you meant by elevator up or down. This is an aileron trim
> tab. I determined what direction the ailerons needed to move before I made
> the tab to achieve the desired trim. The tab can be mounted up or down as
> long as the proper aileron side is chosen to do the type of mount you
> desire and the aileron deflects in the direction desired. In my case, I
> would achieve the same result with a downward pointing tab mounted on the
> opposite aileron. It may be a matter of what is more visually appealing to
> a person. The plane has already flown in the current configuration and
> my trim problem was solved. I just haven't got it mounted permanently yet.
> It's possible that a tab may work better in one configuration as compared
> with the other but an engineer would have to help with that. I don't know
> that answer.
>
> --------
> Gregg Kaat
> 2011 Firefly
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=392599#392599
>
>
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Message 6
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Subject: | Re: Aileron trim-drag question |
My Ultrastar was off in roll trim when I bought it. The top cross tube on
the cage was visibly bent, not enough to be unsafe but enough to reduce the
left wing incidence. I fixed it by making a new universal joint block (on
the US the U-joint is at the main spar) with one hole offset about
1/8". Now the wings are even and the plane flies straight.
My point in relating this is that if the roll trim is off, this is a simple
way to fix it without adding a trim tab.
-Dana
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