login   |    register
General Aircraft
This forum is for general aircraft modelling discussions.
Hosted by Kevin Brant
MONOGRAM F-80 WARPED WING QUESTION
Bigrip74
_VISITCOMMUNITY
Texas, United States
Joined: February 22, 2008
KitMaker: 4,812 posts
AeroScale: 2,615 posts
Posted: Sunday, September 22, 2019 - 01:18 PM UTC
I picked up a MONOGRAM F-80 kit for change. Just now got around to looking at it with the intention of maybe building it for some relaxation.

The wing bottom is one peice and warped almost to the point of looking like a bow.

I thought that I had read in a post some years back that boiling water was used to take out warps.

If anyone has a tip on how to do this please help me out.

Bob
Kevlar06
_VISITCOMMUNITY
Washington, United States
Joined: March 15, 2009
KitMaker: 3,086 posts
AeroScale: 708 posts
Posted: Sunday, September 22, 2019 - 03:09 PM UTC
You can dip the wing briefly in water that has been briefly brought to the boiling point, then turn the heat off before the dipping-- but wear gloves and be careful. Another technique is to play a hair dryer back and forth over the part and carfully bend it back into shape. I have a folding travel hair dryer on my workbench just for this purpose and to assist with difficult decals (Roden's for example) the travel types are usually smaller, putting heat into a smaller area. But-- have you tried to see if the parts will straighten out by placing the top wings on and using a rubber band to see if that works first?
VR, Russ
Naseby
_VISITCOMMUNITY
Slovakia
Joined: October 15, 2010
KitMaker: 814 posts
AeroScale: 468 posts
Posted: Sunday, September 22, 2019 - 06:13 PM UTC
Glue a spar in the wing. Using the hot treatment is a huge risk. I
messed up an Avenger wing this way in the past.
Bigrip74
_VISITCOMMUNITY
Texas, United States
Joined: February 22, 2008
KitMaker: 4,812 posts
AeroScale: 2,615 posts
Posted: Sunday, September 22, 2019 - 06:57 PM UTC
@ Naseby: I tried cutting out a spar, but the wing is so thin that my efforts were not good.

@ Russ: I have clamped 1/2" x 1/2" wood to the wing and thought that I would try the hot water method.
magnusf
_VISITCOMMUNITY
Stockholm, Sweden
Joined: May 02, 2006
KitMaker: 1,803 posts
AeroScale: 1,752 posts
Posted: Sunday, September 22, 2019 - 07:34 PM UTC
Give it a try but I think the chances for a good-as-new-result are slim . I had a minor warp on a wing once that curled up like a piece of bacon in a hot frying pan when trying to straighten it using hot water...

Sorry for being pessimistic!



Magnus
Bigrip74
_VISITCOMMUNITY
Texas, United States
Joined: February 22, 2008
KitMaker: 4,812 posts
AeroScale: 2,615 posts
Posted: Sunday, September 22, 2019 - 07:54 PM UTC
Magnus, thank you for your input. I will try the hot water and it will be no loss if the wing does not weather the effort. It only cost $1.26 USD. So this could be a test kit.

Bob
Kevlar06
_VISITCOMMUNITY
Washington, United States
Joined: March 15, 2009
KitMaker: 3,086 posts
AeroScale: 708 posts
Posted: Monday, September 23, 2019 - 02:16 AM UTC
Bob, I'd try the boiling water trick as a last resort. I usually grab the hair dryer tick first. You've got the right idea with the board, but some wood will warp as well in hot water-- I use a foot long aluminum ruler, depending on the part. I forgot to mention that. Getting an entire wing into a pot of near boiling water is a trick in itself-- use a pair of kitchen tongs-- I also forgot to mention that.
VR, Russ
M4A1Sherman
_VISITCOMMUNITY
New York, United States
Joined: May 02, 2013
KitMaker: 4,307 posts
AeroScale: 159 posts
Posted: Monday, September 23, 2019 - 03:43 AM UTC

Quoted Text

Bob, I'd try the boiling water trick as a last resort. I usually grab the hair dryer tick first. You've got the right idea with the board, but some wood will warp as well in hot water-- I use a foot long aluminum ruler, depending on the part. I forgot to mention that. Getting an entire wing into a pot of near boiling water is a trick in itself-- use a pair of kitchen tongs-- I also forgot to mention that.
VR, Russ



AGREE-

Hi, Russ!
M4A1Sherman
_VISITCOMMUNITY
New York, United States
Joined: May 02, 2013
KitMaker: 4,307 posts
AeroScale: 159 posts
Posted: Monday, September 23, 2019 - 04:42 AM UTC
Hi, All-

Interestingly enough, I bought one of those when they first came out, back in the late 1970s. My Lower Wing was warped, but not very badly. My cure was to use the old, slow-drying TESTORS (tube) Cement- This was the old "recipe" stuff before they changed the formula to comply with the ofttimes ridiculous EPA/CPA/FBI/CIA/AFLCIO/ICCMC/SWAK/EVOO and IOU regulations.

HOWZZAT fer "Alphabet Soup"???

I glued the Upper Wing halves to the Lower Wing and clamped them all together, using a half-dozen of the old-style wooden clothespins with the metal springs in them. I slipped a washcloth between the surfaces of the Upper and Lower Wings and the clothespins in order to protect the surfaces from being marred. I then very carefully slipped two 6-inch steel rules in-between the clothespins and the washcloth, making sure that the steel rules were placed in positions in support of the Lower Wing, and lining up with the Upper Wing halves. These steel rules were added to give me a little bit of extra rigidity...

After setting the Wing assembly aside to dry overnight, I went on to other things. (Namely, my second MONOGRAM 1/48 B-17G) The following morning, I saw that this "method" worked in straightening out the "wing-warp" of my F-80. "Old school", yes. But it worked...

As I said in the beginning of this post, my Lower Wing wasn't very badly warped, so it stands to reason that the Lower Wing conformed to the "strength" of the two Upper Wing parts AND the "stiffening-help" of the two steel rules. Not quite as drastic or as dangerous(?) as the boiling water-trick, but this method was still quite effective in giving me a properly-straightened Wing assembly, without ruining the dihedral-angle of the Wing...

(Note: dihedral- the angle of which the wings of an aircraft are vertically inclined- Websters Collegiate Dictionary)- NOT being a smart-aleck; some of the newer modelers may not be familiar with the term "dihedral", that's all...

I'm not saying that this method will work in the case of this particular F-80 kit, but it might work in other cases. I've used this little "trick" several times subsequently, with good results...

VR, Dennis
Jessie_C
_VISITCOMMUNITY
British Columbia, Canada
Joined: September 03, 2009
KitMaker: 6,785 posts
AeroScale: 6,079 posts
Posted: Monday, September 23, 2019 - 08:38 AM UTC

Quoted Text

@ Naseby: I tried cutting out a spar, but the wing is so thin that my efforts were not good.

@ Russ: I have clamped 1/2" x 1/2" wood to the wing and thought that I would try the hot water method.



Clamping it to wood will probably work. Clamp first, then pour the just-boiled water over.

Have you thought about a very thin metal spar? Maybe a bit of piano wire from the RC section of the hobby shop?
Bigrip74
_VISITCOMMUNITY
Texas, United States
Joined: February 22, 2008
KitMaker: 4,812 posts
AeroScale: 2,615 posts
Posted: Monday, September 23, 2019 - 09:17 AM UTC
Jesse, great idea. I read the post too late.

The experiment is over now:

The wing shattered while taking the clamps and wood off..



If anyone would like an F80 kit with a broken wing. Postage is all it would take.

Bob
M4A1Sherman
_VISITCOMMUNITY
New York, United States
Joined: May 02, 2013
KitMaker: 4,307 posts
AeroScale: 159 posts
Posted: Monday, September 23, 2019 - 10:39 AM UTC
Hi, Bob!

Wowww... That's a shame...

Maybe SOMEDAY some enterprising model manufacturer will take matters in-hand and produce a DECENT 1/48 P/F-80A or C. The old MONOGRAM kit is ACTUALLY BETTER than the much newer HOBBY BOSS offerings. Hold onto the parts, though- You never know when you might come across another one of the MONOGRAM F-80 kits "for cheap", or even a partial "parts kit" with a good Lower Wing. Check Ebay, too...
Bigrip74
_VISITCOMMUNITY
Texas, United States
Joined: February 22, 2008
KitMaker: 4,812 posts
AeroScale: 2,615 posts
Posted: Monday, September 23, 2019 - 11:26 AM UTC

Quoted Text

Hi, Bob!

Wowww... That's a shame...

Maybe SOMEDAY some enterprising model manufacturer will take matters in-hand and produce a DECENT 1/48 P/F-80A or C. The old MONOGRAM kit is ACTUALLY BETTER than the much newer HOBBY BOSS offerings. Hold onto the parts, though- You never know when you might come across another one of the MONOGRAM F-80 kits "for cheap", or even a partial "parts kit" with a good Lower Wing. Check Ebay, too...



I was thinking the same thing. So I will just shelve it for now.
Jessie_C
_VISITCOMMUNITY
British Columbia, Canada
Joined: September 03, 2009
KitMaker: 6,785 posts
AeroScale: 6,079 posts
Posted: Monday, September 23, 2019 - 03:27 PM UTC
Okay, that looks actually repairable. All you need is some sheet plastic to back the cracks and that same piece of wood. As a bonus, I'll bet that the warp would come out a lot flatter
M4A1Sherman
_VISITCOMMUNITY
New York, United States
Joined: May 02, 2013
KitMaker: 4,307 posts
AeroScale: 159 posts
Posted: Monday, September 23, 2019 - 08:34 PM UTC
Hi, All!

I think Jessie may have something there; it wouldn't hurt to try what she says...
Bravo1102
_VISITCOMMUNITY
New Jersey, United States
Joined: December 08, 2003
KitMaker: 2,742 posts
AeroScale: 59 posts
Posted: Monday, September 23, 2019 - 10:01 PM UTC
Jessie is right. An armor builder like me found it easier to fix a major warp in a wing after it snapped into several pieces. That was some very brittle Russian plastic too. Can't tell to look at the built kit.
Kevlar06
_VISITCOMMUNITY
Washington, United States
Joined: March 15, 2009
KitMaker: 3,086 posts
AeroScale: 708 posts
Posted: Tuesday, September 24, 2019 - 04:10 AM UTC
Well that's a real bummer.... maybe gentle heat from a hair dryer would have worked better? I think you should still try and repair it. One thing I notice frequently in old silver molded Monogram plastic kits is a lot of "swirls" in the plastic... I wonder if the wing broke along one of those "swirl" lines? I've read somewhere those are caused by differences in temperature of the plastic as it's injected into the molds, and can cause weak spots.
VR, Russ
Bigrip74
_VISITCOMMUNITY
Texas, United States
Joined: February 22, 2008
KitMaker: 4,812 posts
AeroScale: 2,615 posts
Posted: Tuesday, September 24, 2019 - 04:22 AM UTC
I had offered the kit and Jesse has shown interest. So it should be mailed out in a couple of weeks.

Bob