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Ch09 - Main Landing Gear and Landing Brake

I will build my own retracts main landing gear. I made extensive researches and a lot of drawings. The next few days will be exciting.

In the second image the first drawing is the thickness profile. It`s fit very nice in the strakes. I don`t copied any other gear legs, I developed my own profile.

The second one is the displacement to FS 110, there are alignment tiny circles to glue the A4 paper size. The 9 rectangles support`s the fiberglass mold.

	08/10/2008 Some drawings of the retract gear leg.. After I have printed in A4 size paper and glued then in a 2.5mm MDF. There`s one nail in the center of the shaft just to check the position on the fuselage. Sounds good. 2 Matco wheel`s triple piston brakes to check the heigth inside the strakes and the width/thickness of the final portion of the leg. All is very empiric knowledge and trying fit`s.
	24/10/2008 Steel shaft 3/4" 4130 length 6". Some grooves to better junction with roving, flox and shaft.
	Grooves are in two directions. After fixed in place the shaft will receive the uni roving around.
	Roving of 2400 tex E-glass. The legs don`t need to be made of S-glass, that`s just superstition. Take a look in the link below, is one brazilian builder that build there own leg and tested with a 2200lbs weigth. http://www.youtube.com/watch?v=V2nHbwoK0Gk
	Bundles ready to go.
	Tools to punch the uni inside the mold.
	26/10/2008 Template to make the thickness of the leg fixed in the foam block. Now comes the hot wire. That one makes the contour of the leg to get a perfect fit inside the strakes.
	Width template fixed in the foam.
	The width template makes the displacement of the wheel axels to the FS 110.
	Leg ready to receive polyurethane finish paste and contour to build the female mold.
	One more shot.
	And other.
	01/11/20008 Finishing the legs plug to make the mold.
	I used polyurethane paste to contour the foam. And after sealed with polyvinylic alcohol.
	04/11/2008 Mold ready and fixed inside the supports.
	Another view.
	Center shaft in place. The roving will cross by the sides and around the shaft.
	07/11/2008 Today I laminated the test leg. Whith this one I will make some destructive tests.
	6 hours to make the leg. I used the 220minutes pot life hardenner.
	08/11/2008 Leg looks good. I am very impressed. I think the gaps was filled with epoxy and flox, and is not a real problem. I think if I use the 2200tex roving instead the 2400tex, I can make the work more accurate.
	Leg weight`s 15 lbs.
	Cooooolllll!
	02/01/2009 Here I removed the landing brake with one stileto. Sanded the depression in 1/8". I am building the landing brake with my carbon/aramide hinge. The hinge is floxed in place. I don`t have the plywood or hardware, nor the aluminum hinge. Is just carbon/aramide hinge with a lot of flox. I am making a movie. When I finish the landing brake I will post on youtube.
	LB of 2plies carbon, made in vacuum. The 2 brackets supports are made of carbon and aramide. After ready they were floxed in place and 1 ply of carbon aplied. Look the hinge. In the movie you will see how I made the hinge and the LB. I must do one layup of 2 plies of glass around the hinge. Crossing to one side by the other side. Like that my LB is strong enuff to hold the pressure. I think more 3 days of work here.
	05/01/2009 The actuator is one 4" stroke of 110lbs by Spal. The plywood base mounting will be fixed on the seat back. I floxed one 0.063" aluminum tab with tree riveted MK-1003 betwen 2 plywoods. The actuator support have 12 plies each arm and base. Weights: Actuator with hardware, 2.60lbs Base mounting, 0.14lbs Actuator support, 0.12lbs Complete LB with ancors and hinge, 1.69lbs Floxed Hinge, 0.09lbs SS pin of 0.059", 0.04lbs Aprox. epoxy-flox, 0.26lbs Total, 4.94lbs
	07/01/2009 Base mounting fixed in place with 6 plies of glass.
	Actuator mounted aft of the seat back.

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