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RE: G & L Hobbies Extra 300 build thread - 12/10/2007 4:33:35 AM   
lrglnman


 

Posts: 379
Joined: 5/22/2006
From: Cookeville, TN, USA
Status: offline 		I will try to sheet the wings this week and do other things as I can . Oh the suspence is killing me !!!!! Looks like the Evolution gasser is going on the nose of this baby!!

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James Smith

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RE: G & L Hobbies Extra 300 build thread - 12/11/2007 3:01:30 AM   
lrglnman


 

Posts: 379
Joined: 5/22/2006
From: Cookeville, TN, USA
Status: offline 		Well, Got down to work and did a little sheeting today. Lets take a look.

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James Smith

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RE: G & L Hobbies Extra 300 build thread - 12/11/2007 3:23:26 AM   
lrglnman


 

Posts: 379
Joined: 5/22/2006
From: Cookeville, TN, USA
Status: offline 		Pic 1 shows the wing laying on the balsa sheetingI am getting ready to cut the sheeting to size and I am allowing 1/4 inch overhang on all sides.
Pic 2 shows the cut sheeting and notice how I labeled everything? These wings look the same top and bottom but there is a true top and bottom. I thing its a good idea to lay some cling wrap down to protect the shucks and to keep the wing from sticking to them.
Pic 3 & 4 shows the sheetingand some more labeling
Pic 5 shows the wing fully guled and sheeted on both sides and placed in the shucks with 30 lbs of weight to sandwitch everything in place. Now lets talk about how I got to this step.
After I cut the sheeting to the size of the wing with a little overhang >NOTE< ( On the first wing I allowed 1/4 inch overhang all around I found this to be the minimum overhang.On the next wing I allowed 1/2 inch. This is better) I used Gorilla glue and with a plastic card I spread it real thin all over the sheeting. Then rubbed a wet towel over the wing itself. placed the bottom sheeting in the shucks then placed the wing on top. I spread glue on the orher wing sheeting and dampened the top part of the wing. Place the sheeting on the wing and make sure you have the correct amount of overhang. Place the top shuck down over the wing and add the weight to hold everything in place.
When you fool with Gorilla glue the stuff expands a bunch so you need to allow for this.I had 30lbs of weight to hold a 34 inch wing down and this stuff was powerful enough to move the wing off the sheeting. You have to keep an eye on it and reposition the sheeting on the wing. This glue does not take long to set up to where it will stop expanding. 30-45 min depending on weather. Here in Tennessee its real humid so this glue expands alot. Keep an eye on it!!!!!
Pic 6 shows the glue at work!!!
Pic 7 shows the fully sheeted wing.

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James Smith

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RE: G & L Hobbies Extra 300 build thread - 12/11/2007 3:24:29 AM   
lrglnman


 

Posts: 379
Joined: 5/22/2006
From: Cookeville, TN, USA
Status: offline 		More to come tomorrow

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James Smith

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RE: G & L Hobbies Extra 300 build thread - 12/11/2007 1:11:18 PM   
ron12901


 

Posts: 18
Joined: 9/10/2003
From: palos park, IL, USA
Status: offline 		I am closely following this thread since I have a G & L Chipmunk on order. I was wondering if you could use Gorilla glue for gluinfg the formers, etc. to the fiberglass fuselage?

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RE: G & L Hobbies Extra 300 build thread - 12/11/2007 10:47:13 PM   
lrglnman


 

Posts: 379
Joined: 5/22/2006
From: Cookeville, TN, USA
Status: offline 		I would definitly say yes. Make sure when you get it to wash it good with a mild soap inside and out to remove any mold release. then scuff the area good where the former goes and spray a bit of water on one side and glue the other. should foam up and real nice and hold well. I used 30 min epoxy I got from Hobby Lobby craft store, mixed micro baloons in and stuck it.Rember if you use it to sheet the wings keep and eagle eye on it cause the foaming will move the skin around and get it out of place.it takes 30 - 45 min for it to set and most of the foaming to stop. I am sure the build will be very close to this one and if I can help you pm me . I have seen this kit at Gregs and it looks like a nice kit. He does top notch fiberglass work . The build is faster than a wood kit and weighs about the same.

< Message edited by lrglnman -- 12/11/2007 10:53:42 PM >

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James Smith

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RE: G & L Hobbies Extra 300 build thread - 12/12/2007 2:47:58 AM   
Xtremerc


 

Posts: 96
Joined: 5/24/2003
From: Cookeville, TN, USA
Status: offline 		Just let me say thats NICE......
You've come a long way in a short period of time ,from a trainer to this.
WOW you had some great teachers .....................hehe
looks great.



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RE: G & L Hobbies Extra 300 build thread - 12/12/2007 3:53:10 AM   
lrglnman


 

Posts: 379
Joined: 5/22/2006
From: Cookeville, TN, USA
Status: offline

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James Smith

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RE: G & L Hobbies Extra 300 build thread - 12/12/2007 4:05:56 AM   
lrglnman


 

Posts: 379
Joined: 5/22/2006
From: Cookeville, TN, USA
Status: offline 		Well I did not do much building this evening but I did do quit a bit of sanding. Getting everything ready to install the leading edge and trailing edge.I will be using Titebond carpenters glue to install a piece of 3/8" balsa to the leading edge and a piece of 1/4 " balsa to the trailing edge.Hold it together with t pins till dry.
Greybeard, I will try to get some photos in the next nite or two showing how I will do the servo pockets. I have a spiral cut routerbit that should route a nice clean hole. I figure I will have to freehand it.

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James Smith

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RE: G & L Hobbies Extra 300 build thread - 12/13/2007 2:16:02 AM   
lrglnman


 

Posts: 379
Joined: 5/22/2006
From: Cookeville, TN, USA
Status: offline 		Well not much to report tonigh.
I did manage to get some pics though
[image][/image]

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James Smith

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RE: G & L Hobbies Extra 300 build thread - 12/13/2007 2:26:03 AM   
lrglnman


 

Posts: 379
Joined: 5/22/2006
From: Cookeville, TN, USA
Status: offline 		As you can see in the pics is the results of gorilla glue. I guess if I were to do it again I would use a lite coat of epoxy to sheet the wings . look in pic 3 and you will see what I mean keep and eagel eye on it until it sets up . the foaming action of gorilla glue will move the parts around as it foams. I had 30 lbs od lead weight and it still moved and I missed it. NowI have to scab a piece of balsa to cove this area. One thing though if you let the sheeting hang out 1/2 inch you can omit the 1/4 " trailing edge piece. As in pic 4 & 6.
Pic 5 showes the leading edge fully sanded and installed with titebond glue. I am having to think hard about how to drill stright holes in the fusealage to accept the aluminum spar and fit the wings to the fusealage.

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James Smith

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RE: G & L Hobbies Extra 300 build thread - 12/13/2007 2:59:09 AM   
Champ-RCU


 

Posts: 66
Joined: 2/7/2002
From: Mt. Pleasant, PA, USA
Status: offline 		Irglnman, IMHO, the sheeting that shifted was probably not the fault of the GG, chances are it moved when you put the weight on top. (Ask me how I know:-) If you are only using 30# of weight to put pressure on the skins to the core I feel that you would be very dissappointed in the result if you used epoxy. When I used weight to skin wings 100lbs+ is what I used. This sounds like alot but now I use vacuum and that is easier to control and is a more pressure that is evenly distrbuted over the surface of the wing. Once you try vacuum you won't want to go back to weights. (That is till you get a bag with a leak) That's why I still keep the weights around as a back-up.

Also I will use masking tape to hold the skins in place before I draw a vacuum or put the weights on.

Thanks for showing your build, Good luck.

MTY

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RE: G & L Hobbies Extra 300 build thread - 12/13/2007 12:17:57 PM   
lrglnman


 

Posts: 379
Joined: 5/22/2006
From: Cookeville, TN, USA
Status: offline 		thats great advice Champ.If I do many more of these a vacumn bag setup I will get. So far this is the only way to build kits IMO. I like the way the gorilla glue works ,Its just a learning curve.

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James Smith

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