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20-Nov-2008
Catégorie: Fuselage : Cabin

The flaps position system needs to sense the flaps position so I install a linear sensor.
First I fabricate a small bracket with some leftover aluminium. Here the bracket is already riveted in position.



The sensor is then screwed to the bracket. The sensing arm is at the lower right.



Then I use some parts that were part of the aileron trim and that are not used there to connect the sensor to a clamp on the flaps tube. The clamp will be replaced as it's not the correct size.
The part with the red mark will have to be slightly modified as there is some interference with the clevis.
After final assembly some adjustement can be made by moving the clamp or cutting some length from the rod.
On the picture the flaps are up, and the slider on sensor is completely out.



On this picture, the flaps are down and the slider on the sensor is retracted.



I also riveted the small bracket fabricated yesterday and bolted on the microswitch.




Working time on this subpart
Today :  4h (Total : 202h)

Lectures (2884)
19-Nov-2008
Catégorie: Fuselage : Cabin

I will need the flaps position for two of my systems, so I need to fabricated the sensors' brackets.
I begin by reinstalling all the parts in the fuselage. Some washers are really interesting to get in place.
This is how it looks qith the flaps in the up position.



And the extended position.



The first sensor is a micro-switch that will tell the AoA system that the flaps have left the full up position.
This is a lever type micro-switch. The lever is actuated by the bolt on the cushion clamp (for the time the clamp is too small).
The system allows for some fine tunig by rotating the clamp, adjusting the length of the bolt or folding the lever.




Working time on this subpart
Today :  3h (Total : 198h)

Lectures (2835)
18-Nov-2008
Catégorie: Finishing : Landing gear

I will modify the front wheel fork. The assembly of the front wheel is somewhat akward. The picture shows one of the mushrooms that will hold the wheel in position. Both mushrooms are held in position by torqueing the axle bolt.
The mushrooms are supposed to stay put as the wheel turns, but sometimes they begin to turn. This can induce some oscillations and shimmy.



I found all the informations on VansAirforce. One of the builders even asked Vans about the mod and they didn't object to it. The idea is to install a bolt on the fork that will hold the mushroom.
The only deviation from the informations on the website is that, as suggested by Vans, I'm using a smaller bolt (AN509-8R12).



Here the assembly is done. I only tapped the mushroom, to avoid any cracks in the fork.



Then it's priming time for the fork.



Then the fork is installed on the gear leg, for another special task. It's not possible to verify the torque of the big bolt with a torque wrench. So there is a small trick, it's done by using a small scale. The measure has to be taken a few times after the fork has been rotated a few times to each stop.



Once the correct value set, the gear leg is drilled for the cotter pin.



And now the wheel can be installed.




Working time on this subpart
Today :  4h (Total : 16h)

Lectures (2989)
17-Nov-2008
Catégorie: Finishing : Landing gear

Today I begin by making the brakes lines going from the fusleage exit to the caliper. Nothing very difficult.



The lower part is routed around the wheel axle this will allow enough play as the caliper is moving during braking. Along the gear leg, the tubing is protected by small PVC hose parts. Some electric tape will hold everything inc position during final assembly.



Then I begin working on the front wheel, which was not completed. I take of the wheel and will also take off the fork as I intend to modify it slightly but I first have to do some research on that, so it will next time.



I also installed the engine mounts. The parts are the same but the assembly sequence is different between the upper and lower mounts. The compression points are not the same. It's visible by increasing the size of the picture (see the parts with the small yellow line).




Working time on this subpart
Today :  2h (Total : 12h)

Lectures (2837)
15-Nov-2008
Catégorie: Finishing : Landing gear

I begun today by torquing all the bolts on or near the firewall (brake fluid reservoir, rudder pedals, battery mount...). Then I torqued the six bolts on the engine mount, on one I needeed to add a second washer so that the cotter pin actually prevents the bolt from turning.




I the use my hoist to lift the fuselage. Guillaume gives me a hand to install the gear legs, but it can be done alone.




After thirty minutes, the fuselage can be lowered on the wheels. It looks quute high, I will have to use some steps to climb on board for the time being.




As there is no engine for the time being, the center of gravity is way aft. So I have to keep the sawhorse in the back. I had to add a cardboard box to get the correct height. After the picture, I tied everything down with a rope.




The front gear lecg bolt is inserted from the cabine via a hole drilled earlier in the firewall.




That hole get a small cover that will also get some sealant to avoid fumes from the engine compartment entering the cabin.




And here the left gear leg having been torqued.




Working time on this subpart
Today :  4h (Total : 10h)

Lectures (2854)

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