Paul,
I agree with your conclusion. It is imperative not to let the landing
gear crowd the starboard side of the tunnel, where the brake master
cylinder is mounted. The tubes of our mounting frame that are supposed
to be parallel to the firewall are not coplanar, and the compromise
position we used left the wheel displaced slightly to the starboard
side. Even after putting a shim between the mounting frame and the
swinging arm bearing block, to center the wheel, I still had to make the
modification that the factory published for moving the cylinder outward,
so the tire would clear the cylinder. I also had to re-route the fuel
lines to the port side of the flap/gear lever, which turns out to be
right where we will have to add another lever when we get the new glider
wings... Yet another case of 20/20 hindsight!
The other parameter that is affected by the mounting position of the
landing gear frame is the thrust line of the engine. We had to add a
couple of washers to correct a slight down thrust. Getting the front
face of the frame perfectly vertical at this point might not guarantee
that the thrust line is horizontal, however, due to whatever droop may
be caused by the weight of the engine.
Dave DeFord, #A135
flying wrote:
> I'm in the process of fitting the landing gear mounting frame. The book says
> the correct position is when the top and down tubes are in the vertical
> plane of the fire wall adn within 3mm of it. This is difficult to judge
> given that the fire wall is not perfectly flat. Would I be correct in
> thinking that what is more important than these measurements is that the
> landing gear swinging arm (LG02) is parallel to the centreline of the
> aircraft. I was going to use this to establish the final position of the
> frame. Any thoughts.
>
> Paul Stewart #432
>
>
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