Laser / Turbo prop build

[forgues research]

after sheeting the wings, locating the servo installation, I have sanded both the leading edge and trailing edge , then added the leading edge stock.

Roger

[David A]

Hi Roger.

At the rate you are going we should see it fly at the Stetson Funfly on Sept 13 and 14. Just kidding but hope you can drop by.

Dave Asquini
www.stetsonflyers.com

[forgues research]

	Quote: Originally Posted by David A
	Hi Roger. At the rate you are going we should see it fly at the Stetson Funfly on Sept 13 and 14. Just kidding but hope you can drop by. Dave Asquini www.stetsonflyers.com

Hey Dave,
Nice to see you here, I will try and be there for sure, but not with the Laser

Roger

[forgues research]

The trailing edge is glued but not shaped, while this is going on I worked on the stab , man this is not an arf, not even laser cut but the most fun I had in a long time..

Roger

[jack strickland]

	Quote: Originally Posted by forgues research
	The trailing edge is glued but not shaped, while this is going on I worked on the stab , man this is not an arf, not even laser cut but the most fun I had in a long time.. Roger

Hi Roger, Wait till you get that baby in the air! You will not find a better design for crisp aerobatics, I suspect you will build the 40% next, suspect, hardly, I'll give 10 to 1 odds you will, I know its not possible, but the 40 is a little easier to fly, prolly cause we can see it , and those reynolds numbers don't lie. Am glad you are having a lot of fun with this project, thats what this hobby is all about.
Regards
Jack

[forgues research]

Thanks Jack , yes the 40% is not far off

On another note, I just finished making a new prop for the laser engine, 24*10

Next I will grow Balsa trees

Roger

[jack01]

Roger, since that thing is a turboprop, how about making a prop that looks like this?

[forgues research]

	Quote: Originally Posted by jack01
	Roger, since that thing is a turboprop, how about making a prop that looks like this?

it will be easier to grow balsa trees in the snow country

[jack01]

	Quote: Originally Posted by forgues research
	it will be easier to grow balsa trees in the snow country

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?

[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.