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Author Topic: F4U Corsair  (Read 3077 times)
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Don McLellan
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« on: June 11, 2021, 11:48:10 PM »

Going to take a swing at a peanut scale Corsair, using my craft cutter.  Generally, the balsa is .040" thick, and quite heavy.  I've made no attempt to lighten the balsa with holes etc, but have to say, not sure why.  I think lighteng holes are quite neat.........maybe brain fade.

First pic shows some formers cut with my craft cutter.  Second pic shows some parts that have been cut out.

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F4U Corsair
F4U Corsair
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Don McLellan
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« Reply #1 on: June 11, 2021, 11:54:39 PM »

The next pic shows my first attempt at gluing the fuse together, starting at the nose.  The second pic shows the less than stellar fuse former alignment, even with the 'pegs' (on the side rails) which should help to align the formers.

And yes, there is a fatal flaw.
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Re: F4U Corsair
Re: F4U Corsair
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Don McLellan
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« Reply #2 on: June 12, 2021, 12:48:56 PM »

The formers in the first fuse attempt were a little random, so decided to make the side rails in one piece (first pic).  The side rails are connected at the rear plus at two internal cross braces (which will be removed later).  The second and third pics show the partially strung fuse and the nose. 

Currently building the wing, then will do some surgery on the fuse to allow the wing assembly to be installed.
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Re: F4U Corsair
Re: F4U Corsair
Re: F4U Corsair
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Russ Lister
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« Reply #3 on: June 12, 2021, 02:00:27 PM »

Following with interest, Don   Smiley
I use my craft cutter for vinyl so I'm a bit worried about the dust from balsa getting on subsequent vinyl cuts ... does it produce much?
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Don McLellan
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« Reply #4 on: June 12, 2021, 03:13:54 PM »

Hi Russ,

Yes, my cutter does produce both dust and the odd small chip.   

In addition to cutting balsa, I also occasionally cut numbers from vinyl for 1/32 scale slot cars.  No ill affects from the balsa so far.
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Sky9pilot
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« Reply #5 on: June 12, 2021, 03:51:08 PM »

Nicely done Don, and that cowl is great.  I shall follow with interest!  I built a peanut Corsair awhile back but have a larger one on the "To Do" list!
Sky9pilot
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« Reply #6 on: June 12, 2021, 03:56:44 PM »

Hi Russ,

Yes, my cutter does produce both dust and the odd small chip.   

In addition to cutting balsa, I also occasionally cut numbers from vinyl for 1/32 scale slot cars.  No ill affects from the balsa so far.

Thanks Don .... nice to know that it doesn't cause problems
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tross
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« Reply #7 on: June 12, 2021, 07:05:58 PM »

That's a great looking F4U Corsair peanut Don.
Also will be following.

Tony
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Instructions: Step One...Assemble the pile of sticks shown in pic "A" to look like the model airplane shown in pic "B"........
Don McLellan
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« Reply #8 on: June 13, 2021, 09:02:01 PM »

Thank you Sky and Tony.  The leading edge of the central portion of the bent wing is made up of 3 laminations.  Pic shows three laminations glued together (and a spare) plus the center spine of the wing.  All cut with my craft cutter.
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Re: F4U Corsair
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DavidJP
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« Reply #9 on: June 14, 2021, 03:15:29 AM »

Quite impressed.  What more can one say?  Some people have the ability to cut wood like that by hand - I would find that easier I think than understanding the mysteries of persuading a craft cutter to do my bidding, so not bad for a septugenerarian!
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pedwards2932
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« Reply #10 on: June 15, 2021, 08:46:30 AM »

Do you ever cut thicker wood than 1/32?  I found with my cutter if I go to 1/16 and use the 60 degree blade I get drag marks as the blade crosses the balsa while cutting.  Do you just use the 1/32 and then laminate parts when you need thicker parts?  I still have problems getting the notches to cut cleanly which is why I moved to a laser....it will cut up to 1/8 balsa and does notches pefectly.
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Don McLellan
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« Reply #11 on: June 15, 2021, 12:31:06 PM »

Thank you David.

Hi Pedwards:  My craft cutter will cut up to .040" thick and this is the thickness of the wood I'm using for the Corsair.  One of the remaining hobby shops locally sells balsa labeled 1/32 but is actually .040" thick.

Have done some work on the wing.  Still have a few bits to glue, then sand the whole thing.  Then have to get the wing to fit in the fuse.
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Re: F4U Corsair
Re: F4U Corsair
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pedwards2932
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« Reply #12 on: June 15, 2021, 01:17:30 PM »

Do you use the 45 degree blade?  Mine will cut 1/16 with the 60 degree blade but you have to careful when fully extended as I said it will drag across the balsa.  I was never able to resolve cutting decent nothes on 1/16 but maybe it would work on 1/32
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Don McLellan
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« Reply #13 on: June 15, 2021, 02:21:14 PM »

Yes, I believe it is a 45 degree blade.  As mentioned, I can cut up to .040" material with this blade.  And agree, notches can be problematic.  When I cut balsa, I do it in several passes.  For harder balsa, sometimes up to 8 or 9 passes; softer balsa, 7 or 8 passes.  Also, when I draw the file, I extend the cut lines slighly past the corners, where possible.  This seems to help a little, making better, crisper cuts.  (Your mileage may vary).

Also, Tony Ross (tross) is an expert with these machines, so he may want to chime in.

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Don McLellan
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« Reply #14 on: June 16, 2021, 12:14:50 AM »

Weight of assembled wing, but unsanded is 2.57 grms.  Hopefully can bring that down slightly.  And weight of fuse and wing so far is 5.16 grms.
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Re: F4U Corsair
Re: F4U Corsair
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tross
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« Reply #15 on: June 16, 2021, 06:40:38 PM »

That is looking good Don.
Can't wait to see it fly.

I can post a picture of a cut if OK.
I'm using a 30° for the thin wood and tape, 45° for the initial cuts on thicker wood, and a 60° to finish.
As far as the chicken scratches Phillip I'm just lifting the blade holder up in the carriage.
When cutting .10" wood I lift the initial blade up 1/16", and the 60° blade up .1"

The mickey mouse cutter was modified to cut thicker and it wasn't too difficult Don.
I can send or post some pics and basic instructions in another thread if it helps.
The picture below is of 1/16" wood so any size model you want to design and build now.
I'm not over-cutting the notches.
Everything is one solid polyline and converted to a block.
One block is placed under the drawing and one in the cut layout.
Any changes to design change the cut file section of the drawing.
Moving the cuts around is made more simply.
That TE in the jig is only .036".

Now back to the Corsair if you please and thank you... Grin

Tony
Attached files Thumbnail(s):
Re: F4U Corsair
Re: F4U Corsair
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Instructions: Step One...Assemble the pile of sticks shown in pic "A" to look like the model airplane shown in pic "B"........
Don McLellan
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« Reply #16 on: June 17, 2021, 02:26:54 PM »

Hi Tony,

Yes, please post some instruction regarding cutting thicker material.  Posting here is fine with me.  The only time I've tried larger than peanut scale models, using my craft cutter, is if I glue two of the same piece together (for a fuse former) to get .080" thick formers.  Glued former for my B-17 shown in the first pic.

Did cut open the bottom of the Corsair fuse to allow fitting of the wing.  The weight as shown is 5.59 grms.

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Re: F4U Corsair
Re: F4U Corsair
Re: F4U Corsair
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tross
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« Reply #17 on: June 19, 2021, 08:48:14 PM »

Will do Don.
Those bones are a swing and a hit Grin
Tony
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Instructions: Step One...Assemble the pile of sticks shown in pic "A" to look like the model airplane shown in pic "B"........
Don McLellan
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« Reply #18 on: June 20, 2021, 12:15:26 AM »

Hi Tony,

Thank you!  Have to say this has been quite an interesting build, mostly because I'm doing 'stuff' on the fly.

And I did get my second Covid shot today, so am typing a little slower than usual...............haha..............

I did add some diagonal stiffeners to the outer wings.  Have no clue if these are really needed for a peanut model, but they only added about .015 grms, so I think well worth it.
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Re: F4U Corsair
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Crabby
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« Reply #19 on: June 20, 2021, 05:15:20 AM »

Don, how did you come up with only 5.59 grams with all that lumber? That’s amazing, (a word I only use very sparingly). You are on track for a 9-10 gram peanut Corsair. Did you mention the plan you are using?
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« Reply #20 on: June 20, 2021, 06:52:17 AM »

Ahh well you see Crabby Don is getting on a bit and had to guess the position of the decimal point.  It should be one digit to the right!
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strat-o
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« Reply #21 on: June 20, 2021, 02:51:37 PM »

You've got my interest piqued.  What version of the Corsair are you building? From the photos, I can't tell if this will be like a bubble canopy or a greenhouse canopy as in a F4U-1.  --Marlin
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Don McLellan
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« Reply #22 on: June 20, 2021, 08:28:17 PM »

Hi Crabby, 

All the formers, wing ribs and stringers are .040" thick.  Although it looks like a lot of lumber, it is still reasonably light.  It is a peanut, so that helps with the weight as well and the plan is by  Doug McHard.

Hi Marlin,

It will be the bubble canopy version.  I haven't yet made the buck for the canopy, so that will be interesting.
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Don McLellan
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« Reply #23 on: June 23, 2021, 07:16:13 PM »

Tail feathers more or less done.  The weight shown on the scale includes one small (required for assembly) clothspin.
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Re: F4U Corsair
Re: F4U Corsair
Re: F4U Corsair
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MKelly
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« Reply #24 on: June 23, 2021, 09:04:22 PM »

That's great Don, and very light for the amount of wood evident in the pictures.  Really pretty structure.

Mike
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