Posts: 8
Joined: 4/4/2002 From: Hartford,
WI, USA Status: offline
Pete, how long did it take for you to receive you vacuum system? I ordered one last week and still have not gotten a shipping conformation. I was only planning on using it for the wings, stabs, and rudder, but after seeing you use yours for all the foan pieces I am going to have to give it a try. Keep up the great build thread.
Looks like you're moving right along pete, I see you like the bagger! Only thing I see wrong with the last pic. is the dusty uncovered 3.0 meter, barrow a bed sheet from the wife, the airplane police would not be happy!
Posts: 130
Joined: 3/9/2004 From: Forest,
VA, USA Status: offline
Can't put the 3m under a bed sheet, she's afraid of the dark! That is a good idea though.
I installed the phenolic socket using Probond; I drilled small holes along the cut line to inject the glue. I also capped off the support plates, so that the wing tube can't slide too far to the side and damage the foam in the wing.
Posts: 130
Joined: 3/9/2004 From: Forest,
VA, USA Status: offline
Next step was to start laying out the wing. Barry convinced me that I should use 3 servos for each aileron; with a wing this big I think he's right. I altered the servo layout a bit; I pushed the outboard servos closer to the aileron tips. I also moved all three servos 1" closer to the hinge line.
I made a template that fit the JR9611A servo, and the associated mounting rails. I then used my Dremel tool to route out the space for the rails (about 1/8th" deep), then routed out the center section for the servo bay.
< Message edited by pcastine -- 1/18/2006 4:56:11 AM >
Posts: 747
Joined: 11/4/2005 From: harrisburg,
PA, USA Status: offline
pete, it's vince.
it was cool seeing your extra fly. build looks interesting also. i'll keep checking back for progress. you have a lot to do.. should you really have been flying today?
Posts: 163
Joined: 10/21/2002 From: largo, FL, USA Status: offline
Just wanted to share with you that I have about 15 flights on my yak right now with 2 9152 servos per wing with no problem. I think 2 is fine and 3 is even better. Looks like your build is going great. I built mine so if you have any questions don't hesitate to ask and I will help out if I can.
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Posts: 130
Joined: 3/9/2004 From: Forest,
VA, USA Status: offline
Thanks - I'll probably take you up on that.
I was thinking that with the huge wing area and wide chord, it would be better to use 3 servos on the wing. I'm sure 2 is fine, but I want to be able to stop those snaps on a dime!
Posts: 130
Joined: 3/9/2004 From: Forest,
VA, USA Status: offline
Well, I haven't been in the shop much these past few days, busy with work. But got some stuff done tonight. I was trying to find a foam cutter that would allow me to cut the channel through the wing for the servo wires. I finally found one at Radio Shack, but they had mis-labelled it as a "100 watt Soldering Gun". That must've been why it took me so long to find it. $13.49, wotabargin! I made a little wire fixture to cut the channel. The wooden piece is there to help control the depth, and also to run along a long ruler taped to the wing.
< Message edited by pcastine -- 1/26/2006 4:41:03 AM >
Posts: 130
Joined: 3/9/2004 From: Forest,
VA, USA Status: offline
I tried cutting a few channels in some scrap foam before I cut the wing. Honestly, I did. But, I screwed up the wing panel anyway. I found out that after cutting along a ways, the gun cooled a bit at the outer tip of the loop (but the inner piece got hotter). This melted the foam pretty badly and made a terrible channel. I built a new fixture with the wires separated, and it worked much better.
However, I wasn't happy with the results so I called John and ordered a new panel.
Posts: 130
Joined: 3/9/2004 From: Forest,
VA, USA Status: offline
To make matters worse, when installing the phenolic sleeve into the other core, I used a bit too much Probond, and underestimated how much it would expand. I didn't tape the pieces, or put the wing in the shucks with weight to hold things in place. The Probond expanded and pushed the ply stress plate away from the foam. LESSON HERE: Always clamp your stuff really well, even if you think it won't matter!!!
I tried to fill the gaps, but again wasn't happy with the result. So, since I was ordering one wing panel, might as well get two!
I wasn't looking forward to sanding the wire marks out of the wing panels anyway. I'm hoping that the next set are a little smoother from the factory.
Posts: 130
Joined: 3/9/2004 From: Forest,
VA, USA Status: offline
The stabs turned out better than (the first set of) the wings. I'm setting up the stabs for 2 servos per elevator. Although a single JR8611A would probably be enough power for each elevator, I like the extra security of having two servos. I've seen planes almost destroyed because a linkage came loose on the only elevator servo, and it was only exceptional flying that the plane wasn't demolished.
Posts: 130
Joined: 3/9/2004 From: Forest,
VA, USA Status: offline
When cutting the sheeting for the stabs, my wife offered to let me use her rotary cutter. She uses it mainly for paper and fabrics, and I didn't think it would really cut balsa well. Well, I was wrong! It cuts a great clean line, and when using it with the mat and brace, it's easy to cut a square line through balsa. The stabs are sheeted with 1/16th balsa, but the Fiskars cutter even cut cleanly through 3/32" sheeting.
I don't think my wife's getting her cutting system back!
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RE: Yet Another Yak! - 
