Laser / Turbo prop build

[forgues research]

	Quote: Originally Posted by jack01
	Haha. I think Santa grows some of those. He lives near you right? Snow sounds pretty good right about now though. 60% + humidity and 90-100 degree highs is getting old... Seriously though, this is turning out to be a really neat project! That's good your friend liked the prop! Do you have any plans to produce and sell them, or is it just for fun?

Thanks Jack for the kind words , it is a fun project to say the least.

As for the props, I don't intend sell any props, it is very labor intensive since I dont' use CNC machines.

Besides there so many prop makers nowadays

Roger

[forgues research]

There is something I have been wanting to stress for a while and just keep forgetting.

On the wings when you are doing the spars, the webbing between the stringers top and bottom, make sure you don't make the webbing just glued on the side, I know its a lot easier and faster but you will be relying on the glue joint only to hold things together.

By putting the webbing between the stringers, then the glue holds it in place but the webbing itself is doing the work ,

If anyone is not sure of what I am saying, let me know and I will make a sketch of it.

I will have some pictures later today as I am now shaping the leading edge and trailing edge of the wings.

Roger

[k3sui]

	Quote: Originally Posted by jbdesigns
	Keith, on using balsa/carbon for the spars instead of plain spruce. it is important to know that most wing failures occur due to a failure of the spar which is in compression. it most always bukles and then the wing fails. for example, the spar in compression would be the top spar if you are pulling positive g's. balsa and carbon laminates can be good and strong in tension, but unless they are done very well, they are not so great in compression to resist bukling. John

True, but in a bending moment, where there is compression, there is also tension ... in this case, the bottom of the wing. The tensile strength of the carbon fiber on the bottom would lessen the compressive forces in the top. That is why we see struts on the bottom of high wing planes. Cheaper and lighter than building the wing to carry all the load. The interrib webbing is the finishing touch that makes the whole wing an "I" beam.

[3Dguy]

Sketch, please...

[forgues research]

A little more work was done today, finished shaping the wing leading edge and trailing edge and cut out the ailerons.

And 3D guy, I will post some sketches later tonight.

Roger

[forgues research]

Here is two sketches of the webbing I spoke about.

the one with the side webbing is relying totally on the glue to hold things together, while the other one with the webbing sandwiched between the two stringers relies on the strenght of the webbing itself.

Roger

[3Dguy]

Oh, okay.

[jack strickland]

	Quote: Originally Posted by k3sui
	True, but in a bending moment, where there is compression, there is also tension ... in this case, the bottom of the wing. The tensile strength of the carbon fiber on the bottom would lessen the compressive forces in the top. That is why we see struts on the bottom of high wing planes. Cheaper and lighter than building the wing to carry all the load. The interrib webbing is the finishing touch that makes the whole wing an "I" beam.

Hello, thanks for your interest in this build. Please read all the posts, and number 191 for the I beam info. Thanks
Jack

[forgues research]

In these photos, I am installing the hinge blocks in the wings and ailerons before I install the trailing edge of the wing aileron cutout and the leading edge of the ailerons.

Also before the we close these off , I have also installed a hard wood control horn point .

The boost tabs will be cut out once this is all done..


Roger

[forgues research]

Today, I have the hinges done on the wings,
you will see in the photos , the procedures I am taking, I made a drill jig on the lathe for the hinge points.
and just capping the root plywood rib,

Roger

[forgues research]

This is the boost tab on the ailerons,

Roger

[McFueler]

	Quote: Originally Posted by forgues research
	Today, I have the hinges done on the wings, you will see in the photos , the procedures I am taking, I made a drill jig on the lathe for the hinge points. and just capping the root plywood rib, Roger

Looking good Roger , BTW robart sells a drill gig that work well .

[forgues research]

	Quote: Originally Posted by McFueler
	Looking good Roger , BTW robart sells a drill gig that work well .

Yes I know , I have one but I found it was not as accurate as I would like , maybe its the operator, ME.

Roger

[McFueler]

	Quote: Originally Posted by forgues research
	Yes I know , I have one but I found it was not as accurate as I would like , maybe its the operator, ME. Roger

Yea , I know what you are talking about .

[forgues research]

Today, I took a break from sniffing balsa dust and glue

So here is the making of a tail wheel ...

You wanted photos, you got them

Roger