The Volutera Cozy Mark IV Project #1504 by Alexandre Souto

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Ch13 - Nose Section

26/02/2009

NG-30 glassed per plans. But, I laminated 2plies UND all over the foam. Not just the 2" extension in the center part.

Not contoured yet.

15"Hg of vacuum.

10/03/2009

Outside portion of NG-30 with the 1/4" plywood alum. insert. Aluminum tab floxed after the 6plies was vacuumed.

And 3 pre laminated 15plies of glass in plans position.

Note that my NG-30 is 2" longer, one inch front and one inch aft.

Nose bulkheads laminated on both sides, now is just triming work.

All was made in the vacuum.

You can see the 2" extension long nose in the drawings.

20/03/2009

Here a litlle deviation from the plans.

I will build my own nose gear leg of kevlar roving wraped in 3k carbon BID.

The MKNG6 and MKNG15 will be all composite made.

First I built both of carbon.

21/03/2009

MKNG6, the withe filet inside the tube is flox.

What touch the carbon is 2 plies of glass BID not the steel rail.

Carbon laminate begins with the stack sequence of 90/0/30/0/-30/0/90/0.

From this point, when the carbon is flush with the rail of the tapered roller bearing the sequence is 90/0/30/-30/0.

The zero is carbon roving, tigthening with pressure rolling around the tube to get off excess epoxy and to compress the others plies.

Drawing the templates, same dimensions and locations as the plans one.

But the leg is 1" longer.

Foam ready to be hot wired in the width.

Now the height of the leg.

Job done.

After contour the edges and smooth the leg, I aplied 4 hands of poliurethane paste and sanded the plug to good shape.

23/03/2009

After 8 plies of glass the mold is ready.

I built one support of plywood, so my mold don`t distort.

Shot.

MKNG15 in place and with one support to hold the alignment.

The PVC pipe will hold the alignment of the MKNG6.

New heater with one device that we use to make eggs to become litlle chickens, sorry I don`t know the English name, incubator

27/03/2009

All process during 13:30h to 17:00h.

After the perforated film comes the caul plate and the tire tube strips to make pressure.

Vacuum of 20"Hg and 60degrees C until cured.

29/03/2009

Ok, here the kevalr leg. Not ready, there are some triming work to do.

Is very difficult to sand and trim kevlar. What I do is to sand and make the fuzzys, after with one stilleto blade I cut off the fuzzys.

Weight is 1794g. I don`t know the glass leg weight with the MKNG6 and 15 fitted.

The kevlar roving was laminated around the two tubes of NG6 and NG15, in one continuos session. That is were the tension forces act, in the front portion.

Aft the leg, strips of roving connect one to the other.

There are some little gaps that was filled with epoxy. But the final product is real good.

Well, kevlar is excellent in tension, and in the nose gear we need one real good spring piece.

If that fails, the nose wheel don`t hit the prop, cause the kevlar in that thickness simple don`t break in two parts .

And I will build one good nose bumper, just in case.

24/05/2009

Back to the work. NG0, mine is NG-1.5.

The leg looks real good with the 2 plies BID 3k carbon.

 

NG0 floxed in place with BID tapes, always with the 0.25" recess in the foam.

I used pieces of 3" plywood between the NG30.

Also the NG3 and NG4 clamped at 6.71".

 

 

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