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M.K. 1 SPITFIRE from you won't believe its coro

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Old 01-15-2004, 10:00 PM
  #1
deadeye11987
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Default M.K. 1 SPITFIRE from you won't believe its coro

This is the page where I will walk you through the building process of the Spits wing.I am very busy right now but I will try to get this done asap. Take your 3 views from Spitfire in action and enlarge them to a 37 inch wingspan (real plane 36ft 10 inches)10%of this span is 3. 7 inches.To make the math easier enlarge your wing from 37 inches to 40 1/2 inches,adding 3 and a half inches to the span but do this like you have been enlargeing the entire wing, span and cord.
I recently have seen the plans for the Mig seven just to see how it was built and the wings are simillar except for a few areas.The spitfire is a 3 piece wing.One of the changes made from the Mig is you don't fold the wing once at the leading edge,you make 2 folds the space of which is the distance of 1 pliece of 4 mill and one piece of 2mill about 5/16ths of and inch apart.when the center section is folded back over the spar you end up with a flat front leading edge about 5/16 thick.You are now able to reinforce the leading edge with anything you like.We have used titanium embeded in balsa, 5/16th wooden dowel or arrow shaft.The glues used are zap and Kicker which you must use the plane cannot be built without kicker and poly urethane glue from Elmers.which you spray window cleaner on to activate it.Just before you make the fold put a heavy thick bead of the poly glue on the two leading edge folds, and spray with the window cleaner.That is how all of our airplane wings are built.So you must cut a center section from 2 mill and just like the mig make it so it can be folded back over the spar but remember to make the 2 folds for your square leading edge.The center sectoion on the spit is 5 and 1/2 inches wide with a cord of just over 8 inches LESS the leading edge you will add later.Also make sure you cut the top portion of the center section and the out side panels a little wider than needed so they will be long enough to make it all the way to the trailing edge when folded over. Always mark your wing panel blanks with a top and bottom so you don't wrap the wrong side over.The outer panels are drawn the same way except for the following.Your double fold line only goes out 2 and 3/4 inches on the outer panels.At this point you stop and cut the leading edges apart back down to your first fold line.From this point outward you cut the coro out following the eliptical leading edge. When you are done you will have the outer panel joined for the first 2 and 3/4 inches and then they will be separated the rest of the way out.From the cut point on the bottom panel you now install about a3 flute wide piece of 4 mill coro cut flush to the leading edge of the bottom panel,and glue this in place.Now when you fold the top panel over you now glue the top panel leading edge to the 4 mill coro and that will match the fold line from the center section and your first 2 and 3/4 outer panels.This glue joint MUST BE COMPLETELY DRY before you continue the fold over to the trailing edge. So you take your center section on a flat table and join the two outer panels to it using 2 inch wide pieces of coro leaving space in the center for your spar.Put these joiner strips of coro on the top panel as well as it will give you something to glue the fold over to at both of the center section breaks.Also you must decide if you want balsa tips or just coro .If you want balsa tips stop the coro wing at the end of the ailerons,if not just trace the entire wing outline.The balsa tips are just for appearance and do nothing to help the way the wing flys.Back shortly on the spar ailerons and final wrap.
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Old 01-15-2004, 11:11 PM
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Default RE: M.K. 1 SPITFIRE from you won't believe its coro

deadeye, thanks a ton for posting the information. I'm sure you plan to but please post some pictures of the process as well. I think I understand it pretty well but like they say a picture is worth a thousand words.

Thanks!
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Old 01-17-2004, 09:54 AM
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Default RE: M.K. 1 SPITFIRE from you won't believe its coro

Cool I've bin waiting for this thread to start.
I'm always interested in new coro construction technique.
I understand most of the walk through so far but some pic's would help.
This is going to be cool.
Thanx.
MrG.....
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Old 01-19-2004, 09:25 PM
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Default RE: M.K. 1 SPITFIRE from you won't believe its coro

Here are the pics to go with the first info set. The silver is a MK 7 and the white is a MK 1 with balsa tips . The silver does not have the ailerons cut out yet and will have coro tips. This shows the cutting of the coro and where to fold it. Back soon
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Old 01-19-2004, 09:43 PM
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Default RE: M.K. 1 SPITFIRE from you won't believe its coro

2nd set of pics
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Old 01-19-2004, 09:48 PM
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Default RE: M.K. 1 SPITFIRE from you won't believe its coro

Last set for spit wings
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Old 01-22-2004, 04:11 PM
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Default RE: M.K. 1 SPITFIRE from you won't believe its coro

Awesome
I've built a few 3 piece wings.
But nothing as good looking as this one's going to be.
I like the double fold LE too.

I know the rest of You guys that were giving Ace Bogie a hard time, are reading this post..
Any comments?
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Old 01-22-2004, 11:33 PM
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Default RE: M.K. 1 SPITFIRE from you won't believe its coro

I'm still learning about coro methods. I couldn't quite tell how you will join the 3 pieces? Do the outer pieces slide into the center and then the edges glued? Also i may have missed it but what type of glue are you using?

thanks,
dave
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Old 01-23-2004, 08:01 PM
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Default RE: M.K. 1 SPITFIRE from you won't believe its coro

The glues are Elmers polyurethane and for tacking everything together use CA and Kicker.More building info coming this weekend. It has done nothing but snow here,not much time to do anything but shovel.Another pic of what these planes [img][/img]look like when we are done a MK 1. and 2 MK 9s
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Old 01-23-2004, 09:24 PM
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Default RE: M.K. 1 SPITFIRE from you won't believe its coro

MK-1 and2 MK-9s
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Old 01-25-2004, 03:03 AM
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Default RE: M.K. 1 SPITFIRE from you won't believe its coro

Awesome Spit's
I hope Mine will turn out as good as any one of those birds.
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Old 01-26-2004, 12:17 AM
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Default RE: M.K. 1 SPITFIRE from you won't believe its coro

The next step is to make the spars.The center section is 1 inch high and cut to length of the center section span.From this point the outer panel length goes from 1 inch thick to 3/8ths at the tip.The wing has 1 and 5/8ths diehedral from the center section break to the tip.So with the center section laying flat your piece of tapered outer spar is 1and 5/8ths above the center section bottom measured at the tip bottom.I make the spars out of honeycombed carbon fibre all one piece. I will also show how to make them out of a wooden ruler made of soft pine 1/8th inch thick.The carbon fibre spar is cut all in one piece . The ruler is cut in 3 pieces and then joined at the diehedral break on each side of the center section with small pieces of ruler as doublers. Photos show the finished spars and 2 shots of the honeycombed carbon fibre that I use.The carbon fibre is much much lighter than the ruler but very expensive.It is one of the reasons the plane performs so well at this size.
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Old 01-26-2004, 12:19 AM
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Default RE: M.K. 1 SPITFIRE from you won't believe its coro

2 shots of the carbon fibre
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Old 01-26-2004, 01:23 AM
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Default RE: M.K. 1 SPITFIRE from you won't believe its coro

Now cut out of 4 mill coro the leading edge doubler and the aileron. Make the aileron flutes run past the outer panel break and half way onto the center section (DO NOT GLUE TO CENTER SECTION YET)as the photo shows.Note the notch in the leading edge of the doubler to allow for the fold.These are now C A glued into position to the outer panels only.
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Old 01-26-2004, 02:02 AM
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Default RE: M.K. 1 SPITFIRE from you won't believe its coro

Next it is time to join the 3 wing panels together and install the spar.Cut several strips of 2 mill coro 2 inches wide. These will be used to join the bottom panels together .Also glue them to the upper panels so when the fold is made you have an edge to glue to the top skin where it joins the center section.Mark a line 3 inches back from the center section leading edge. Lay the outer panels in position and continue this line out to where the spar ends using this line as a guide for installing the spar.Place the spar in position and draw a line across the center section front and back to show you where to cut the 2 inch coro joiners. The bottom and top 2 mill coro joiners may now be CA glued to the bottom wing skin going from the spar to the leading edge making sure you can still make the 90degree fold in the leading edge and from the spar to the aileron flutes. This will now join the 3 piece wing together.On the top skin glue the joiners to the outer panels only at this time.Glue the spar in position starting at the center section using CA and kicker.When solid glue the spar to one outer panel and when hardend by the kicker glue the spar down on the other outer panel.With the spar in place the bottom skin now carries the correct diehedral and you are now ready for the poly urethane glue and the final fold.Photos of the above to come.
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Old 01-29-2004, 03:44 PM
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Default RE: M.K. 1 SPITFIRE from you won't believe its coro

So far so good.
Can't wait for the next part.
Thanx
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Old 01-29-2004, 05:56 PM
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Default RE: M.K. 1 SPITFIRE from you won't believe its coro

Here are the pics to go with the last post.It has been a while since I built the Spit and to make the leading edge match the fold you must add a piece of 2 mill coro to the leading edge doubler.Use your aileron cut out material as this already has a curved edge to match to the leading edge curve.
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Old 01-29-2004, 06:03 PM
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Default RE: M.K. 1 SPITFIRE from you won't believe its coro

Next the leading edge must be glued down. fold the upper panel in place and glue the top panel to the leading edge.Do not glue it to the spar as of yet.use CA and get lots in the fold area and make sure your leading edge is firmly glued in place. You cannot allow the leading edge to come apart or everything will be shot.
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Old 01-29-2004, 06:04 PM
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Default RE: M.K. 1 SPITFIRE from you won't believe its coro

One more shot of the above step
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Old 01-29-2004, 07:35 PM
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Default RE: M.K. 1 SPITFIRE from you won't believe its coro

The next step and this is the most important step to the wing. You must tack glue a 5/16th jig under the wing on the aileron hinge line to give you the needed washout.Do not omit this step or you are just wasting your time. The jig is 5/16th at the one end and 1/8th inch thick at the other and is 12 inches long.
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Old 01-29-2004, 07:38 PM
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Default RE: M.K. 1 SPITFIRE from you won't believe its coro

Now stand the wing up on the leading edge and run a heavy bead of poly urethane glue on the top of the spar and the bottom of the spar.
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Old 01-29-2004, 07:51 PM
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Default RE: M.K. 1 SPITFIRE from you won't believe its coro

I use a straight piece of wood as a platform to clamp the wing to. .Now pin the wings leading edge to the board so that it will not lift up when folding the top wing skin in place.Apply CA to the trailing edge and the aileron front where the top skin will glue to.With 2 seperate clamps clamp the top skin down to the trailing edge and to the aileron. Let this dry thourghly before proceeding.This will lock the proper washout into the wing.
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Old 01-29-2004, 07:54 PM
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Default RE: M.K. 1 SPITFIRE from you won't believe its coro

Proceed to the other panel and repeat the process exactly. Now it is time to fold over the center section.
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Old 02-04-2004, 11:52 AM
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Default RE: M.K. 1 SPITFIRE from you won't believe its coro

That washout jig is a great idea.
Do You think double sided tape would be strong enough to hold the jig in place?
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Old 02-04-2004, 04:01 PM
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Default RE: M.K. 1 SPITFIRE from you won't believe its coro

Looks great, those walmart clamps are awsome for the price and handy as hell.
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