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Cox FW190 Balsa Build

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Cox FW190 Balsa Build Empty Cox FW190 Balsa Build

Post  duaneh Fri Aug 12, 2022 4:04 pm

The recent thread on the Cox FW190 got me motivated to build this one. The plan looks good, but the non-availability of the Cox foam wings is an obstacle for builders.

Thanks to GallopingGhostler and 944_Jim for linking to threads on Stunt Hangar. Following the links provided crucial dimensions for the wing, and a pdf file of the plan.

With this information, I can duplicate the wing in balsa, making for a straightforward build.

I have the fuselage and tail parts cut out, but still need rib patterns to build the wing. My draftsman is slacking.

Cox FW190 Balsa Build 100_3611
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Post  rsv1cox Fri Aug 12, 2022 5:02 pm

I have always liked the shape of the FW-190 and your rendition shows it very well. Nice balsa selection too. I gather it's going to be profile?
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Post  Levent Suberk Fri Aug 12, 2022 5:30 pm

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Post  Ken Cook Fri Aug 12, 2022 6:57 pm

It would be foolish to make tapered ribs. Make the wing a constant chord wing and offer tapered flaps. 1000 times easier to do. I wouldn't even put a spar in the wing as I would offer it a solid leading edge which would be all the strength it would need.
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Post  944_Jim Fri Aug 12, 2022 10:39 pm

Duane,
I can't believe how fast you go from thought to design to execution!

Is the wing tip detail at full scale? How about the cutout in the fuselage for the wing? Print off those views in full scale and trace onto Formica or 1/16" plywood...then sandwiched/stacked plates and a sanding block.

Always a pleasure watching your builds
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Post  duaneh Mon Aug 15, 2022 9:02 pm

Ken, Yes this will be a tapered wing. My intent is to replicate the shape of the Cox foam wing exactly, in order to build the model as it was designed.

Levent & Jim, Thanks for the hints on tapered wings, but I got that covered.

I drew this up this morning. It is the same dimensions and airfoil as the Cox wing. I added “sorta  FW-ish” tips. They look better than the flat plate style shown on the Cox plan.

Cox FW190 Balsa Build Cfw_wi10

It will be built upside down over the plan, that,s why the leadouts are on the "wrong" side.
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Post  944_Jim Mon Aug 15, 2022 10:01 pm

What can I say? Oh yeah...subscribed with notifications!
WooHoo...Go Duane!
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Post  getback Tue Aug 16, 2022 5:55 am

My draftsman is slacking. wrote:
Bull i think your draftsman is right on time from that drawing ! Very Happy Thumbs Up
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Post  duaneh Thu Aug 18, 2022 6:43 pm

A little more progress to report on the FW. I got the wing built.
Cox FW190 Balsa Build 100_3712


I’m finding out that I’m terrible at taking pictures of the build in progress. I just don’t think of it while I’m working, then when I do, I’ve missed interesting stuff.

Here is the plane taped together for a portrait.Cox FW190 Balsa Build 100_3713

All the pieces stacked on the scale. Everything is here but the tip weight and the covering. I'm pretty happy with the weight so farCox FW190 Balsa Build 100_3714
.
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Post  944_Jim Thu Aug 18, 2022 8:25 pm

Man! I'm digging this build. How do you find the time to do this? Only a few months ago you knocked out the Top Flite Junior Aces Trio...and  now this. I'm embarrassed by my stalled projects.

If I remember correctly, the Foam Wing one was six ounces and change. You may just beat that.


Last edited by 944_Jim on Fri Aug 19, 2022 9:20 am; edited 1 time in total (Reason for editing : Spelling)
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Post  duaneh Thu Aug 18, 2022 11:22 pm

Jim, you're still working full time, and I'm not. I've always been a serial builder, and these small profiles go together quick.
My weight goal for the FW is 6 oz. It's looking like I might make it for a change.
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Post  rsv1cox Fri Aug 19, 2022 6:23 am

"I’m finding out that I’m terrible at taking pictures of the build in progress."

It's a good habit to get into.

My long ago scratch built P-38 put together 50+ years ago went pictureless and I regret it as I have forgotten how I did much of it.  I would like to duplicate it today and have the wings built but I can't remember how I did the rest of it, so it sits.  

Cox FW190 Balsa Build P1013851

I bought a bunch of cheap cameras on ebay, mostly Olympus C-3000 some for a little as $5.00 and hung them all over, workshops, tractors, ATV's where they are always available.  When you get old, gray and used up like me you will appreciate the history and nostelgia they provide.  

Cox FW190 Balsa Build P-38_o22
Cox FW190 Balsa Build P-38_o21

A little battered today, it's my most flown control line airplane.  Lot's of encounters during WW2 with your FW-190.
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Post  getback Fri Aug 19, 2022 7:26 am

Hello , the wing looks good , do wish i new how those ribs and the wide spar? is put together i like the looks alot . Did you say you got a PDF of just the wing ? Would like a copy if not to much inconvenience . This Site Rocks!
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Cox FW190 Balsa Build Empty Finished!

Post  duaneh Sat Aug 20, 2022 2:15 pm

Eric, the ribs & spar are notched, so the ribs just slide on. It is the same method used on the Baby Flite Streak and Top Flite Junior Aces. For a pdf of the wing, PM me an email address. It may take a bit because I want to test fly it first, in case revisions are needed.

I got the markings finished up this morning. Finished weight came out to 5.8 oz., so barely under my 6 oz. target.


Cox FW190 Balsa Build 100_3715
Cox FW190 Balsa Build 100_3716
Cox FW190 Balsa Build 100_3717
Cox FW190 Balsa Build 100_3718
Cox FW190 Balsa Build 100_3719
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Post  rsv1cox Sat Aug 20, 2022 2:36 pm

Both look great, especially the camoflage job. Colors match perfect and I like the sharp angles. Did you take it from an actual FW-190?
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Post  944_Jim Sat Aug 20, 2022 6:13 pm

Hubba-Hubba! Man, that is beautiful.
And you beat the factory weight.

When is the maiden?

When you hang it by the lead-outs, how does it hang?
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Post  Marleysky Sat Aug 20, 2022 6:40 pm

Man,you do nice work!
Let us know where you start out with the CG and if you have to add any nose or tail weight. I checked my plans and there is no indicator for the Balance Point, or CoG. I'm guessing it should fly right off the plans if no balance point is shown.
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Post  duaneh Sat Aug 20, 2022 9:07 pm

Marley, it concerned me also that the Cox plan gives no recommended balance point. My actual balance point came out to be 1/2" back from the LE at the center. You can see my Sharpie marks here.
Cox FW190 Balsa Build 100_3720

This seems quite far forward to me. It does help explain why the leadouts also seem far forward. When we do the hanging test, it all works out.
Cox FW190 Balsa Build 100_3721

The Cox plan also shows no rudder or engine offset. I went with the straight-ahead rudder, but added 2 deg. engine offset.

The maiden could be as soon as tomorrow, if this crazy weather will settle down. We had a tornado warning today, unusual for Aug.
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Post  getback Sun Aug 21, 2022 6:41 am

p.m. sent , I didn't know you were building two ? I guess i missed something ?? They both look very good and hanging at a nice point Thumbs Up Hope the maiden goes good .
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Post  duaneh Sun Aug 21, 2022 8:04 am

No, there's only one airplane. It's done in faux German markings. Camo on top, blue bottom with yellow recognition bands on the tips.
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Post  rsv1cox Sun Aug 21, 2022 8:53 am

getback wrote:p.m. sent , I didn't know you were building two ? I guess i missed something ?? They both look very good and hanging at a nice point Thumbs Up  Hope the maiden goes good .

Got me too Eric, but I should have known better, camo up, blue down.
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Post  andrew Sun Aug 21, 2022 11:26 am

rsv1cox wrote:
getback wrote:p.m. sent , I didn't know you were building two ? I guess i missed something ?? They both look very good and hanging at a nice point Thumbs Up  Hope the maiden goes good .

Got me too Eric, but I should have known better, camo up, blue down.  

Same here -- I finally realized it, but it took a double look!
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Post  getback Mon Aug 22, 2022 7:31 am

duaneh wrote:No, there's only one airplane. It's done in faux German markings. Camo on top, blue bottom with yellow recognition bands on the tips.
Now that is True Camo !! LOL This Site Rocks!
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Cox FW190 Balsa Build Empty It Flys!

Post  duaneh Mon Aug 22, 2022 7:51 pm

Test flew the FW Sunday. My first impression was "Man, this thing is fast!" The engine is a new-to-me Black Widow, and it really turns up. Line tension was good. Maneuvers were smooth, but larger than expected. After the engine quit, it had a good glide, but dropped its nose when it slowed. It also passed the stress test when a pullout from an outside loop was about a foot too low. It was really hauling, and there was no damage from the high speed inverted landing. (Except the prop.)
I think the CG could be a little further back, but it's OK the way it is. A very fun airplane to fly.
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Post  944_Jim Mon Aug 22, 2022 9:12 pm

WooHoo, she flies!

Congrats. Fine job.
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