Yellow Aircraft F/A-18C Twin (Two Engines) KIT Full Build BUILDER'S Thread
05-20-2008, 05:02 PM
#426
Senior Member
Join Date: Jan 2006
Location: wetlands, US MINOR OUTLYING ISLANDS
Posts: 264
Likes: 0
Received 0 Likes
on
0 Posts
RE: Yellow Aircraft F/A-18C Twin (Two Engines) KIT Full Build BUILDER'S Thread
True. however there are some other pitfalls with that method but hope it goes well given you only get one shot at joining the PU rubber. Tom, your model is looking good.
05-20-2008, 05:15 PM
#427
RE: Yellow Aircraft F/A-18C Twin (Two Engines) KIT Full Build BUILDER'S Thread
ORIGINAL: DaveMatthews
Hi Tom,
How you going to center the (2) moulds when joining the 2 halfs with the rubber poured and jelly set?
Dave
Hi Tom,
How you going to center the (2) moulds when joining the 2 halfs with the rubber poured and jelly set?
Dave
Dave,
Thanks for the compliments.. i've got a "centering" pin located where the axle is. the pin is a 1/4" OD piece of aluminum that is glued into the ply baseplate. I then put the tupperware (glad the GF didn't mind haha) "bowl" over the centering pin and glued it to the baseplate.
Here's what the right wing panel looks like so far... have one very light coat to put over the panel line details to get them to blend in. I'm not looking for them to match perfectly, as the darker primer under the light coat should help w/ the weathering effect.
05-20-2008, 06:08 PM
#428
My Feedback: (12)
Join Date: Aug 2002
Location: Scottsdale, AZ
Posts: 4,462
Likes: 0
Received 0 Likes
on
0 Posts
RE: Yellow Aircraft F/A-18C Twin (Two Engines) KIT Full Build BUILDER'S Thread
Its tricky but you could always make both halves and let them cure then use adhesive to join them, theres some serious adhesives for PU out there.
05-20-2008, 07:28 PM
#429
RE: Yellow Aircraft F/A-18C Twin (Two Engines) KIT Full Build BUILDER'S Thread
ORIGINAL: ianober
Its tricky but you could always make both halves and let them cure then use adhesive to join them, theres some serious adhesives for PU out there.
Its tricky but you could always make both halves and let them cure then use adhesive to join them, theres some serious adhesives for PU out there.
Ian,
I've seen what you are talking about.. the company i got all the PU from sells some that is supposed to "molecularly" bond the 2 pieces together... we'll see how 1 tire comes out w/ the sandwich method. if it works, i'll go with that method.. if not, we'll try others
05-20-2008, 08:32 PM
#431
RE: Yellow Aircraft F/A-18C Twin (Two Engines) KIT Full Build BUILDER'S Thread
Well.. Here's Terry's pane line and access panel technique complete And a little bit of weathering started. gotta get some chalk pastels tommorrow to finish the weathering on the wing.. but i gotta order my markings first. All of the rivet detail is about 4 hours worth of work, and thats JUST the top of the wing.. ugh... and i wasn't going to do this scale.. guess i kinda have to now. haha you'll notice the big paint chip missing from one of my "aluminum" tape panels. it kinda ticked me off at first that it peel that big of a piece off, but i think putting a random dab of paint on the panel will give it a nice weathered / chipped paint look. The other aluminum bits showing thru are where i just scraped a lil bit of paint off the aluminum tape.
05-21-2008, 10:04 AM
#432
RE: Yellow Aircraft F/A-18C Twin (Two Engines) KIT Full Build BUILDER'S Thread
Here's the 2 mold halves for the main tires. Still debating on how i'm going to get the front tire off of the rims as they wont come off for the life of me.... anyone have any ideas?
05-21-2008, 01:10 PM
#435
RE: Yellow Aircraft F/A-18C Twin (Two Engines) KIT Full Build BUILDER'S Thread
ORIGINAL: YellowAircraft
Hi,
Some new front tires?
Hi,
Some new front tires?
i've got some brand spankin new ones, just can't get them off the rims. PM me your paypal addy and the cost of a new front tire w/ shipping to 22812 and i'll get some $$ shipped off to ya
05-21-2008, 03:14 PM
#437
RE: Yellow Aircraft F/A-18C Twin (Two Engines) KIT Full Build BUILDER'S Thread
ORIGINAL: yeahbaby
are they hard rubber or original foamie style?
bro' I need to order a set of brakes from ya'. I'll give a shout L8R
buck
are they hard rubber or original foamie style?
bro' I need to order a set of brakes from ya'. I'll give a shout L8R
buck
ORIGINAL: YellowAircraft
Hi,
Some new front tires?
Hi,
Some new front tires?
Buck, i believe they are still the original foamie tires. Either way, i'll figure out some way of getting some rubber ones made. I thought mine would be easier to get off since they are somewhat old, but those things might as well be welded onto the rim they fit so tight. And i dont want to have to cut them off b/c i need them in 1 piece to get a decent plug out of em...
The Good news is, the first tire is done cooking. Only took about 2 hours for it to reach a semi-cured but EXTREMELY hard state.. pics to come soon
Here's the pics. unforunately, my mold shifted slightly putting the tire halves off center, so the first tire is unuseable, but no worries, i'll get the next ones right.
The thread halves are only off about 1/16" so it "may" still be useable, just depends on if you want a "perfect" tire or not. haha
05-21-2008, 03:32 PM
#438
Senior Member
Join Date: Jan 2006
Location: wetlands, US MINOR OUTLYING ISLANDS
Posts: 264
Likes: 0
Received 0 Likes
on
0 Posts
RE: Yellow Aircraft F/A-18C Twin (Two Engines) KIT Full Build BUILDER'S Thread
ORIGINAL: invertmast
Here's the pics. unforunately, my mold shifted slightly putting the tire halves off center, so the first tire is unuseable, but no worries, i'll get the next ones right.
Here's the pics. unforunately, my mold shifted slightly putting the tire halves off center, so the first tire is unuseable, but no worries, i'll get the next ones right.
This is what I thought would happen in my past post. but good first go.
05-21-2008, 03:33 PM
#439
Senior Member
Join Date: Jan 2006
Location: wetlands, US MINOR OUTLYING ISLANDS
Posts: 264
Likes: 0
Received 0 Likes
on
0 Posts
RE: Yellow Aircraft F/A-18C Twin (Two Engines) KIT Full Build BUILDER'S Thread
When you do the front tyres you will have to make a cone to fit the tyre on the rim or it won't go on.
05-21-2008, 04:06 PM
#440
RE: Yellow Aircraft F/A-18C Twin (Two Engines) KIT Full Build BUILDER'S Thread
ORIGINAL: DaveMatthews
This is what I thought would happen in my past post. but good first go.
ORIGINAL: invertmast
Here's the pics. unforunately, my mold shifted slightly putting the tire halves off center, so the first tire is unuseable, but no worries, i'll get the next ones right.
Here's the pics. unforunately, my mold shifted slightly putting the tire halves off center, so the first tire is unuseable, but no worries, i'll get the next ones right.
This is what I thought would happen in my past post. but good first go.
I 'thought i had thought of everything to keep it from shifting, but my centering pin and then the 1 alignment pin i had around the outside circumference of the mold wasn't enough.. so i've put 5 alignment pins in place now, which should keep it from shifting. I'm also making up a small "tub" to put the entire mold in to keep it aligned that was as well.
And i'm beginning to wonder if the front tires dont wear out all that quickly, if it is even worth the hassle of upgrading the fronts to rubber.... I could let a pair of mains go for well under $100 that way..
05-21-2008, 05:19 PM
#441
Senior Member
RE: Yellow Aircraft F/A-18C Twin (Two Engines) KIT Full Build BUILDER'S Thread
One way is to pour the first half of the mold. When cured, cut little triangular keys all around the "live area" then pour the second half. This also helps with any deformation between the two halves during molding.
You would at that point also cut your "Fill" and "Vent" channels. Then you could inject the material into your closed and mated halves. This would yield no flashing and a single piece without having to mate two halves during the process. Not a big deal for a few tires, but huge after about the 10th or 20th set.
I was wondering if the tires would look like foam in the final cure. I think dipping the tires in resin would seal them and create a smooth surface to mold from...and also allow them to be demolded easier and not have a foam-looking surface. I was even thinking that it may be rough to get the masters out of the mold as the molding compound might soak into the foam a bit and then cure. It's pretty closed cell foam though.
Looking good. And fun to do, right?
Also, I've found that removing to screws that connect the two halves of the YA mains wheels, without stripping one or two, can be challenging. Proceed with caution here.
Paul
You would at that point also cut your "Fill" and "Vent" channels. Then you could inject the material into your closed and mated halves. This would yield no flashing and a single piece without having to mate two halves during the process. Not a big deal for a few tires, but huge after about the 10th or 20th set.
I was wondering if the tires would look like foam in the final cure. I think dipping the tires in resin would seal them and create a smooth surface to mold from...and also allow them to be demolded easier and not have a foam-looking surface. I was even thinking that it may be rough to get the masters out of the mold as the molding compound might soak into the foam a bit and then cure. It's pretty closed cell foam though.
Looking good. And fun to do, right?
Also, I've found that removing to screws that connect the two halves of the YA mains wheels, without stripping one or two, can be challenging. Proceed with caution here.
Paul
05-21-2008, 05:41 PM
#442
RE: Yellow Aircraft F/A-18C Twin (Two Engines) KIT Full Build BUILDER'S Thread
ORIGINAL: SDCrashmaster
One way is to pour the first half of the mold. When cured, cut little triangular keys all around the "live area" then pour the second half. This also helps with any deformation between the two halves during molding.
You would at that point also cut your "Fill" and "Vent" channels. Then you could inject the material into your closed and mated halves. This would yield no flashing and a single piece without having to mate two halves during the process. Not a big deal for a few tires, but huge after about the 10th or 20th set.
I was wondering if the tires would look like foam in the final cure. I think dipping the tires in resin would seal them and create a smooth surface to mold from...and also allow them to be demolded easier and not have a foam-looking surface. I was even thinking that it may be rough to get the masters out of the mold as the molding compound might soak into the foam a bit and then cure. It's pretty closed cell foam though.
Looking good. And fun to do, right?
Also, I've found that removing to screws that connect the two halves of the YA mains wheels, without stripping one or two, can be challenging. Proceed with caution here.
Paul
One way is to pour the first half of the mold. When cured, cut little triangular keys all around the "live area" then pour the second half. This also helps with any deformation between the two halves during molding.
You would at that point also cut your "Fill" and "Vent" channels. Then you could inject the material into your closed and mated halves. This would yield no flashing and a single piece without having to mate two halves during the process. Not a big deal for a few tires, but huge after about the 10th or 20th set.
I was wondering if the tires would look like foam in the final cure. I think dipping the tires in resin would seal them and create a smooth surface to mold from...and also allow them to be demolded easier and not have a foam-looking surface. I was even thinking that it may be rough to get the masters out of the mold as the molding compound might soak into the foam a bit and then cure. It's pretty closed cell foam though.
Looking good. And fun to do, right?
Also, I've found that removing to screws that connect the two halves of the YA mains wheels, without stripping one or two, can be challenging. Proceed with caution here.
Paul
paul,
i like your idea about the triangular keys, i might have to try that. Ya know, i was a wee bit leary of the silicon molding rubber soaking into the wheels, but amazingly it is EXTREMELY easy to pry off of the foam tires. I can say, that the 95 duro rubber i'm using should last a LOOONNNGGGG time. these things are as hard as car tires! lol
05-21-2008, 05:47 PM
#443
My Feedback: (12)
Join Date: Aug 2002
Location: Scottsdale, AZ
Posts: 4,462
Likes: 0
Received 0 Likes
on
0 Posts
RE: Yellow Aircraft F/A-18C Twin (Two Engines) KIT Full Build BUILDER'S Thread
Silicone molding is the best, hardly need mold release, if any, and it lasts a long time.
05-21-2008, 05:59 PM
#444
RE: Yellow Aircraft F/A-18C Twin (Two Engines) KIT Full Build BUILDER'S Thread
Ian,
no lies there. i bought 3 can of Universal mold release thinking i would be going thru this stuff like hot cakes (like when molding fiberglass parts in fiberglass molds).. but i haven't even used 1/4 of a can yet...
no lies there. i bought 3 can of Universal mold release thinking i would be going thru this stuff like hot cakes (like when molding fiberglass parts in fiberglass molds).. but i haven't even used 1/4 of a can yet...
05-21-2008, 07:35 PM
#445
RE: Yellow Aircraft F/A-18C Twin (Two Engines) KIT Full Build BUILDER'S Thread
ORIGINAL: ianober
Silicone molding is the best, hardly need mold release, if any, and it lasts a long time.
Silicone molding is the best, hardly need mold release, if any, and it lasts a long time.
Can you bring some samples of your work with this to the Willow on screening night?
05-22-2008, 01:17 PM
#446
RE: Yellow Aircraft F/A-18C Twin (Two Engines) KIT Full Build BUILDER'S Thread
First 2 "useable" tires are completed. again, their not perfect, but they are getting better everytime. I'm going to keep these 2 for myself since they are not "perfect" in what i'm expecting others would want. The test tire is extremely hard, and i can say that this could be the last set of main tires you'll ever need.
05-22-2008, 01:44 PM
#447
My Feedback: (12)
Join Date: Aug 2002
Location: Scottsdale, AZ
Posts: 4,462
Likes: 0
Received 0 Likes
on
0 Posts
RE: Yellow Aircraft F/A-18C Twin (Two Engines) KIT Full Build BUILDER'S Thread
No, not really BW.
Those look great Thomas, should get some long life out of em. What is the shore strenght of the compound you used? 95A?
Those look great Thomas, should get some long life out of em. What is the shore strenght of the compound you used? 95A?
