RE: The Scratch Plane featured in Fly Rc  
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All Forums >> RC Airplanes >> Scratch Building, Aircraft Design, 3D/CAD >> RE: The Scratch Plane featured in Fly Rc
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RE: The Scratch Plane featured in Fly Rc - 4/9/2008 6:28:30 AM   
jg95762


 

Posts: 17
Joined: 1/10/2005
From: cameron park, CA, USA
Status: offline 		The second wing went together much more quickly, partly because I discover the razor plane for shaping the 1/4 leading edge!

Here are some pictures of my partially complete fuselage. It took longer than I expected to glue the 1/64 ply and 3/32 wing supports and then sand the wing support to shape. I could certainly do it faster next time.

To make sure the wings sit correctly in the fuselage I ended up drawing some lines on the plan to see that a line through the two holes in the ribs should be parallel with the top line of the fuselage extended. I then drew a line on the ribs and a line of the fuse and carefully sanded until I could get the wing to fit in with these lines parallel. I am not sure how critical this is, but it obviously effects the angle of attack.

I then extended the lines on the plans that show where the formers go so that I could put the fuselage halfs on the plan an mark where the formers go.

It was a little tricky gluing it all together. I cracked on of the formers because the CA set so quickly and I didn't have the former square. But some additional CA fixed that! I managed to round off the top of the fuselage where the horizontal tail feather goes but fixed it but glue on some 1/16 balsa and sanding it down.

Tonight I put most of the skin on the fuse and am happy to see that it is square and seems strong.

Anyway, so far no major screw ups. At least not that I am aware of.

I was trying to figure out how to glue the 1/4 wing tips to the wings but wasn't sure how best to do it. Has anyone done this yet?

When it comes to putting on the monocote or whatever the covering is I am clueless - are there any good forums that someone can point me at?



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John Gray

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       Post #: 26

RE: The Scratch Plane featured in Fly Rc - 4/9/2008 10:20:57 AM   
lrglnman


 

Posts: 328
Joined: 5/22/2006
From: Cookeville, TN, USA
Status: offline 		Jg I got my wing tips glued on monday. all you have to do is center the leading edge and trailing edge with your tips and glue with thin ca. after it is glued in place , come in at the main spar and glue in some wing tip angle bracing on top and bottom. thats it! my wing looks real nice . the razor plane make easy work of the leading edge. also a balsa strip cutter is real nice as well.

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The Large Lineman
James Smith

(in reply to jg95762)
       Post #: 27

RE: The Scratch Plane featured in Fly Rc - 4/9/2008 8:55:16 PM   
jg95762


 

Posts: 17
Joined: 1/10/2005
From: cameron park, CA, USA
Status: offline 		When you say wing tip angle bracing is this a piece of triangular shaped balsa or something special? If balsa, what dimension (1/4, 1/8, 1/16) did you use? Any photos??

I have a balsa strip cutter - it is great tool. I also had the razor plane when I built the first wing but was too dumb to think to use it!

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John Gray

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RE: The Scratch Plane featured in Fly Rc - 4/10/2008 1:57:03 AM   
lrglnman


 

Posts: 328
Joined: 5/22/2006
From: Cookeville, TN, USA
Status: offline 		I hope this drawing will help. I will post pics as soon as I can.

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The Large Lineman
James Smith

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       Post #: 29

RE: The Scratch Plane featured in Fly Rc - 4/10/2008 1:59:13 AM   
lrglnman


 

Posts: 328
Joined: 5/22/2006
From: Cookeville, TN, USA
Status: offline 		well It did not turn out like it was suppose to. Sorry. As soon as our club photographer sends me the photos I will post them here.

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The Large Lineman
James Smith

(in reply to lrglnman)
       Post #: 30

RE: The Scratch Plane featured in Fly Rc - 4/10/2008 5:32:16 AM   
jg95762


 

Posts: 17
Joined: 1/10/2005
From: cameron park, CA, USA
Status: offline 		Thanks - Your drawing is plenty good enough for me to see what you did. I will add the same type of 1/4 inch wing braces in line with the spars, top and bottom. They make a lot of sense and I am surprised they were not called for on the original plan.

I epoxied my two wing halfs together tonight - took quite a while to get set up to glue them, but I am hopeful they will come out straight! If they don't I wont be happy.

I found a good series of videos on how to apply ultracote - http://www.rcuniverse.com/magazine/article_display.cfm?article_id=726
Now I need to go buy and iron and heat gun. Any recommendations on what to get? Also is there particular covering material that I should use or not use?

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John Gray

(in reply to lrglnman)
       Post #: 31

RE: The Scratch Plane featured in Fly Rc - 4/10/2008 12:03:30 PM   
lrglnman


 

Posts: 328
Joined: 5/22/2006
From: Cookeville, TN, USA
Status: offline 		http://www3.towerhobbies.com/cgi-bin/wti0161p?&I=LZ0813
This is the set up I use not too expensive. I like this one better http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXB361&P=0
Ultracoat is the easiest to use any of that will do fine. one thing though make sure you drill a small hole in each rib so hot air can escape as you install the covering. 1/8" hole will work fine. The trick to ultracoat is getting the iron hot enough to lay down the covering but minimize the shrinkage . Then come back with the iron hotter and shrink the covering. Any trouble spots hit with the heat gun. thats my method of doing it. work slow , take your time.

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The Large Lineman
James Smith

(in reply to jg95762)
       Post #: 32

RE: The Scratch Plane featured in Fly Rc - 4/10/2008 2:58:21 PM   
cdnarcher


 

Posts: 5
Joined: 9/21/2007
From: Airdrie, AB, CANADA
Status: offline 		I just picked up the rag yesterday and got the plans resized. I will start on it next week. Should be fun.

(in reply to lrglnman)
       Post #: 33

RE: The Scratch Plane featured in Fly Rc - 4/14/2008 8:50:58 PM   
jg95762


 

Posts: 17
Joined: 1/10/2005
From: cameron park, CA, USA
Status: offline 		huh - it looks like there were some server issues over the weekend and some entries were lost. I will repost the pictures that I added Friday night.

One of the questions I had was about the Trailing Edge, which is a fair bit deeper than the 1/4 deep aileron stock that I purchased per the plan. I am not sure if this is because I messed up or what. Anyway, I can glue some sheeting on to the bottom of the airleron to make it the same depth/thickness as the trailing edge, but I am not sure if this will change the flight characteristics???

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John Gray

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       Post #: 34

RE: The Scratch Plane featured in Fly Rc - 4/20/2008 6:09:50 PM   
jg95762


 

Posts: 17
Joined: 1/10/2005
From: cameron park, CA, USA
Status: offline 		Here are some pictures from a week or so ago that show how I glued to two wing halfs together. I used two 1/4 inch pieces of wood under the outer ribs, then used a big clamp that I built from a home depot yard stick. I put packing tape on the underneath of the wing halves before putting the epoxy on. I then put packing tape over the top of the wing and put a one-by-four on top of the whole thing to keep pressure on it while it dried. The result was good. I also put the nylon bolt through the wing into two pieces of 1/4 ply. I used a metal bolt of the same size with a notch in it to cut the thread and then ran thin-CA down the thread of the metal bolt and screwed it in and out to make the thread hard. Once I got the wing on with the dowel and the bolt there was small (1/16) gap under the wing. I guess this is due to the dihedral. Anyway, the last picture shows how I glued some 1/16 sheeting on to 'fill' this gap.

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< Message edited by jg95762 -- 4/20/2008 6:12:48 PM >

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John Gray

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       Post #: 35

RE: The Scratch Plane featured in Fly Rc - 4/25/2008 3:33:09 PM   
larrypaul


 

Posts: 8
Joined: 9/14/2002
From: Pensacola, FL, USA
Status: offline 		Finished my scratch, right after I got the magazine, built it with lighter materials, such as changing sizes in fuse sides and and fillers,also added landing gear, and this model does fly great, fully airobatic as well, built a lot of models but the scratch is #1 now, monokote covering, and a cf2812 Emax, with 7x6 prop

(in reply to lrglnman)
       Post #: 36

RE: The Scratch Plane featured in Fly Rc - 4/25/2008 3:35:22 PM   
larrypaul


 

Posts: 8
Joined: 9/14/2002
From: Pensacola, FL, USA
Status: offline 		11 volt 1000 ma battery supplys the power LiPo

(in reply to larrypaul)
       Post #: 37

RE: The Scratch Plane featured in Fly Rc - 4/25/2008 3:37:11 PM   
larrypaul


 

Posts: 8
Joined: 9/14/2002
From: Pensacola, FL, USA
Status: offline 		Great simple club project!!!!!!!!

(in reply to larrypaul)
       Post #: 38

RE: The Scratch Plane featured in Fly Rc - 4/25/2008 4:11:14 PM