Bud,
Thanks for that. I was relying on the wingtips being at the correct
angle, and setting the ailerons up to match the wingtips, and then
setting the flaps to match the ailerons. Now I understand I need to set
the flap using the root incidence board. Then matching the ailerons to
match the flaps. I will need to check for twist. As you say, I am being
as careful as possible during the build to reduce trimming during test
the test phase.
Cheers,
Brian Phillips,
489.
On 30/03/2020 1:43 am, budyerly@msn.com wrote:
>
> Brian,
> Don't overlook that initial statement to check for twist.
>
> During the initial setting of the wing sockets, I use two level saw horses or
trestles to set my socket and at the same time, I set the incidence using the
root incidence board on both wings dead even. I also make a wing tip incidence
board. I align the tops of these two boards and check each wing to the other.
>
> Carpenters have made dead flat tables for years with just two straight sticks
set on the end to get the top level. I use the same technique. Stand back and
check the "sticks" are dead level with no twist on one wing, then go to the
other wing and set the incidence boards in the same place on the other wing and
check. If the wings are very close (and they normally are). I press on.
>
> Then make no mistake, I set the flaps using the root incidence board exactly
the same on each wing. If they aren't, fix it. One flap may be high, or set
farther back, whatever, make them the same. If the flap brackets are off, make
or buy new ones and get it right. Then set the ailerons with the flaps. If
the tip isn't quite right (many times slightly high). Then I cut it.
>
> That careful work during the build will pay dividends during the trimming
> phase
of your flight test period. But things don't always go as planned.
>
> See my Trimming 101 for a already built wing. Yes, I have cosmic T square
> holders
made from nylon blocks that hold my T squares in exactly the same place.
But I also rely on my Mark One eyeball, and that tip incidence board will come
in handy.
>
> Best Regards,
> Bud Yerly
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=495461#495461
>
>
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