Laser / Turbo prop build

[forgues research]

	Quote: Originally Posted by tonyc9075
	You make it look easy. Have you ever done a laminated prop? Are laminated prop's stiffer?

To make a laminated prop, the work is exactly the same, but you would first prepare thin layers of wood, glued together first, then on to the machine.

The problem with an apparatus like I have is there is a lot of artistic to it since you have to finish the prop by eye balling it and balancing it., That's why I dont' sell any

Roger

[Fastasp]

Bruce! From what you said in your post about your friend's QQ YAK, it must have been a Wren 54. I have two AirWorld Ravens and Composite Arf Yak and have had no problems with "hot wings." How far was the exhaust from the wing and what was the wing made out of? Thanks! Hayes Hutchins

[forgues research]

Today, after a very nice flying session at the field, my buddy came back to my place and helped me cut the top part of the second wing..

Roger

[forgues research]

Since I couldn't get 1/4 square spruce, from the local hobby shop, I decided to make my own, and today, I installed some on the second wing. , also the tube socket is in and glued.

and for Tony about the props, here is the biggest one I made a few weeks ago, for my EVO 300, its 36*12...

Roger

[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

[forgues research]

	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,
For the tube socket holes, I made plywood templates for the root and for the 4th rib. you have to align them exactly and I use little nails through the foam with masking tape also so nothing moves..

On the plans from Jack he does show you how to go about it., Its not hard at all.
Also aside from myself here, Jack is on here for questions that I might not be able to answer, after all it is his design. and Scott Morgan who has built a few of these...You are not alone LOL

For the spruce being replaced by balsa with carbon fiber, I can't answer this since I haven't done it, I presume you could ...But also the weight saving in this area might not justify the amount of work , Jack and Scott can chime in for this as they have more experience with this design

The airplane is already built very light.. remember that..

Roger

[KEITH RUSH]

Roger,

Thanks for the reply. I went back and read from the beggining and seen how you did the wing tube. Sorry for the redundent question. I aslo seen your building the 33% and not the 40%, so I will have to ask Jack about the 106. I'm enjoying watching you progress step by step.

Thanks,

Keith

[tonyc9075]

Keith, I am building the 40%, along with the help of Scott and Jack. The answer to your carbon fiber question is no one will use it. Spruce, 1/4 " stock is all it takes. Jack doesn't use carbon fiber, Scott doesn't use it and since they have great flying Lasers mine does not use carbon fiber. I know that Scott's 40% use a 3W, 106 and his came out at 28Lbs.
Hope this helps.
Tony

[BAS]

I am not sure which Wren it is the exhause are about 1 and 1/2 feet away from leading edge it is a balsa and lite ply wing with ultracote for covering. He even put some brass plates on top of the wing around the leading edge before the fire but they still got hot.

[KEITH RUSH]

Tony,

Thanks for the info. I didn't know that they were only 1/4". It wouldn't be worth the trouble.

Does anyone know if a set of foam core wings would weigh about the same as the jig built ones? I was just thinking that the cost to make the jigs, and the other materials, you might be able to get a foam core set cut for the same money.

Thanks,

Keith

[tonyc9075]

Mine is foam core, cut by Scott, Scotts is foam core also cut by Scott. Like I said, Scotts Laser is 28 lbs finished. Scott has both wings, foam core and foam rib, he flies foam core. Must be a reason. All I am doing is following the methods that have proven sucussful for Scott. Find his 40% Laser build here on FG. Lots of good info.
Tony

[FlyguyXII]

This is really kool keep up the good work and the pics!!

[KEITH RUSH]

Tony,

Thanks for the info. I will look for his.

Keith

[jack strickland]

	Quote: Originally Posted by KEITH RUSH
	Roger, Thanks for the reply. I went back and read from the beggining and seen how you did the wing tube. Sorry for the redundent question. I aslo seen your building the 33% and not the 40%, so I will have to ask Jack about the 106. I'm enjoying watching you progress step by step. Thanks, Keith

Hi Keith, The 106 should fly the 40% Laser just fine, at 28#, depending on what you want to do with it, personally I do not like foam wings, I feel they are inferior to, strength wise, weight wise, and longitivy, to the built up wings. The I beam spar is much stronger than foam, IMHO. I fly IMAC so I am concerned with the weight, and 30 to 34 pounds is ideal for windy conditions, in competition, also I prefer a 150 cc engine for the vertical performance it provides. At any configuration on the wings, you will be amazed at the flight performance on the Laser Keep in touch.
Regards
Jack

[Fastasp]

Bruce! Thanks for the information! None of my engines have that spacing between the exhaust and the wing and I have not had "hot wing" issues. Must be the material that the wings are made of. Thanks again for the information. Hayes Hutchins