Laser / Turbo prop build

[forgues research]

I would like to thank everyone participating in this thread with either questions or answers...

I would also like to say that the way I am doing this build is not the only way to do things, its just one of many but one I am comfortable with ..

Here I am showing you with pictures how I personally go about preparing the sheets for the wings.

I am using white glue as per Jack Strickland's recomandation and he is right , it does sand better then the yellow carpenters glue.

To apply the glue, I have found a small syringe in the wall paper department which comes filled with wall paper glue, I simply rinse it out and its good to go for this application...

Roger

[KEITH RUSH]

Jack,

Thank you for your response. I will be looking forward to receiving a set of your plans.

Thank you,

Keith

[rkorenek]

Hello Roger
I very much would like to see detail pictures regarding the leading edge of the wing, the trailing edge of the wing, and the ailerons. I would like also see pictures detailing what happens with the rear spar. I think the procedures you are using, making wings, are the best I've seen. I think they are light, strong, accurate and economical.

Thanks,
Randy

[rkorenek]

	Quote: Originally Posted by forgues research
	While waiting for my buddy to come over and help cut the wing I have been making the wing tube socket. For those interested, I wrap wax paper around the tube, then wrap a six inch fiberglass tape heavy tupe, and make it overlap until you have reached the lenght you need , in my case 16 inches..and hold in place with making tape, I will take pictures of the next one as I am making the different steps. Also I had to make another propeller so I can fly tomorow, here you see it with the fist coat of varnish, Roger

Hello Roger
Yes I am very interested in how you made the wing tube socket. I am amazed how much I paid for a cardboard tube. Can't wait to try your technique.
Thanks, Randy

[forgues research]

	Quote: Originally Posted by rkorenek
	Hello Roger Yes I am very interested in how you made the wing tube socket. I am amazed how much I paid for a cardboard tube. Can't wait to try your technique. Thanks, Randy

Hi Randy,
First for the wing techniques, its not my invention. but it works great..

As for the wing tube socket, Jack Strickland told me how to do it and guess what it is so easy...

You take the aluminum tube you are going to use, wrap a bit more the lenght of the socket you will need with wax paper from the grocery shop . I tape it so it will not unrol, two layers is good.

Then using Roving Fiberglass material, I use 6 in wide, roll it around on the waz paper overlapping it as you go for the lenght you will need.. again I tape the end so it stays put.
After this , you can use epoxy or polyester resin...

I used Polester resin, I mixed more then enough and then with latex gloves, I simply poured some resin on the fiberglass, and rubbed it in until the material changed color, you do this for the whole thing , and you should have plenty of time before the resin starts to cure. Leave alone until nice and cured. then pull the tube out of it, , voila a socket.

Roger

[forgues research]

while waiting for the balsa sheeting,, I think I could grow my own

I cut more spruce 1/4 square sticks for the fuselage sides..I also cut the front plywood and glued them with white glue (carpenter's glue) and put those sand bags to good use again.. and the turbine for encouragement lol

Roger

[forgues research]

This morning I got the two fuse sides started.

Also glued the top wing sheeting on the second wing again using the method I used in 1991. Both give the same results , its just a matter of preference.

Roger

[forgues research]

OOPS, here is the fuselage sides,

[stevep]

Looking good Roger, I love lasers

[McFueler]

Well it looks like Walt's dog (Boomer) is not the only famous dog now !!!!

[forgues research]

	Quote: Originally Posted by McFueler
	Well it looks like Walt's dog (Boomer) is not the only famous dog now !!!!

Ya but she don't care, give her food and she is happy, by the way she is a Golden Retreiver which I had shaved in late April

Roger

[jbdesigns]

	Quote: Originally Posted by KEITH RUSH
	How did you cut the holes in the ribs for the tube socket so that it is square in the wing panel? Also instead of using spruce for the wing spars, could you use balsa spars with carbon fiber mat laminated to one side for added strengh? The reason I ask is I am ordering a set of plans today from Jack, and I am thinking of using a 3W-106 and trying to think of ways to keep the weight down. Thanks, Keith

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. to be strong at all to resist buckling, they need carbon on both sides of the balsa stick, essentially making the stick into a mini I beam. the carbon strips are the top and bottom of teh beam and the balsa acts as the shear web in between. for all of the work to make this special spar, i just forget that busy work and use good old spruce. while i am confident that if designed properly and used, the carbon balsa spar is a little lighter. but i mean it has to be designed and determined that the spar is sufficient for the job. i don't like going right to the bleeding edge of technology as when you go there, you often get bit. i don't have the time resources to build multiple airframes while i experiement.

i am not trying to scare off anyone trying to substitute composite materials in place of the traditional natural ones. i just want those that go that direction to know there is inherent risks. with the risks, come rewards and possible failures. everyone has different thresholds for risks and that is what really determines how far some will go with their experimentations.

good luck to all who dare to be bold and venture into new territory. i love it all.

John

[forgues research]

	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. to be strong at all to resist buckling, they need carbon on both sides of the balsa stick, essentially making the stick into a mini I beam. the carbon strips are the top and bottom of teh beam and the balsa acts as the shear web in between. for all of the work to make this special spar, i just forget that busy work and use good old spruce. while i am confident that if designed properly and used, the carbon balsa spar is a little lighter. but i mean it has to be designed and determined that the spar is sufficient for the job. i don't like going right to the bleeding edge of technology as when you go there, you often get bit. i don't have the time resources to build multiple airframes while i experiement. i am not trying to scare off anyone trying to substitute composite materials in place of the traditional natural ones. i just want those that go that direction to know there is inherent risks. with the risks, come rewards and possible failures. everyone has different thresholds for risks and that is what really determines how far some will go with their experimentations. good luck to all who dare to be bold and venture into new territory. i love it all. John

Good information John, thanks for posting

Roger

[Pittsflyboy]

Interesting work Roger.

[eagle1]

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