|Sep 29, 2012, 10:11 AM|
Or you could paint with a water based urethane clear coat 1st then after dry
HIT IT with impunity using regular foam eating types of paint.
Regardles, it's not pink anymore :-)
Terrific work and progress.
|Sep 29, 2012, 12:24 PM|
|Sep 29, 2012, 11:20 PM|
I found some urethane spray paint at the store but at $12 a can Vs $3 for regular primer, I cheaped-out & went with the primer.
Are we forgetting something?
I was so eager to get her painted I plum forgot about the battery hatch. Its just as well I ran out of paint yesterday. My plan is to make the front canopy removable giving access to the battery tray. Using masking tape I outlined the hatch...
A buddy loaned me a hot-wire foam cutter. Using the tape as a guide I cut the hatch free...
That looks like plenty of access to the battery area...
Now I can get back to painting her...
That's enough primer, I'll let that dry overnight.
In the meantime I turned my attention to the wing. I'm planning to add a short center section to the span. First I need to glue two pieces of foam together to get sufficient thickness. Time to break out the Gorilla Glue again...
Spreading the glue evenly...
Adding water to the other piece...
Slap the two pieces together...
...and once again its dinner plate time...
While that dries I started work on the template ribs that'll be used to guide the hot-wire cutter...
Unfortunately my wood-shop is being used as a pint-booth for the fuselage, so now's not the best time to use the belt sander to shape these template ribs. So that's as far as I'm going today. Hoping to get the wing cut tomorrow.
|Sep 30, 2012, 07:42 PM|
Well after my success carving out the fuselage battery hatch I was looking forward to trying the hot-wire gizmo again. I pinned balsa template ribs to both ends of a block of foam...
You maybe wondering what the notch in the rib is all about. Well the Cub's wings use a carbon fiber tube as the main spar. I couldn't come up with an easy way to drill a hole span-wise down the wing piece I was about to make so I decided instead to just cut a slot. I'll use expanding foam or something to fill the slot later on...
So it was time to use the spiffy hot-wire cutter. This was the unfortunate result...
Apparently this isn't as easy as it looks. I'd love to play with this more, definitely want to master this process but in the interest of getting this bird done I switched to...
Starting with a new block of foam I broke out the router & cut a slot for the wing-rod...
Now that's a nice clean slot, MUCH better...
Then it was back to my trusty belt-sander to shape the airfoil...
Here's a comparison of the hot-wire wing on the right & the sanded wing on the left...
Don't get me wrong though, I have nothing against hot-wire foam cutting. I'm just not very good at it yet. There's lots of great threads on the subject, I'll read-up on it, practice some & hopefully next time will yield better results.
So here we are test fitting the sanded center section. Looks pretty good to me...
Yellow & Black
Meanwhile back in my wood-shop/paint-booth more progress was made...
While the finish is far from perfect its about what I expected having painted directly on foam. Its certainly plenty good for this silly project...
I'm going to let this paint dry overnight then I'll mask out the rest of the windows & the lightning-bolt graphic & lay down a couple of coats of black.
|Oct 01, 2012, 10:54 AM|
Not sure what the current cost to H2O based varathane in a brush can is these days.
$12 for spray does sound high.
Light weight spakle make s good filler too.
I like your sander alternative to HW !
Great Progress !
BTW today is moving day.
I'll then be on the road until Saturday.
C U L8r
|Oct 01, 2012, 10:12 PM|
I've heard spackle mentioned before. I'll have to give that a try next time. That H2O stuff looks interesting too, thanks.
The funny thing about spray painting is you spending hours on end masking & then about 30 seconds spraying...
Yet another template, aren't computers great?..
The idea here is to carefully cut through both the template & the masking tape below...
Peal away the excess tape...
Add the window lines...
Then wrap her up like a last minute birthday present...
20 seconds of spraying...
And we have windows!..
We're not done yet though. Next is the signature Cub, Flash Gordon lightning bolt...
There we have it (the yellow doesn't quite match but what can ya do?)...
Looking pretty snazzy in a Cub sorta way...
|Oct 02, 2012, 03:30 AM|
This is lovely and I hope it flies a treat, you going to slope it on the maiden? Going back to the hot wire cutting and templates, looks like the heat melted into the wood templates, you can also try making templates out of malamine veneer , available at kitchen cupboard guys, pcb or fibreglass board, aluminium , all seem to handle the hot wire ok , but must be sanded nice and smooth.
Keep up the great thread
|Oct 02, 2012, 11:26 AM|
I'm not too worried about matching the yellows. In a way the mismatch helps highlight the bits I built Vs the stock Cub.
I've not decided where I'll maiden her. There's a smallish grass hill I may toss her off to get the trim & whatnot figured out. Proper slope flying is an hour plus away. I have local access to a winch & a few eager tow-plane pilots, so we'll see. I do prefer to get the plane up nice & high on a maiden so there's room to fiddle with the trim.
This & my mirror posts on other RC forums have given me a good idea of what I did wrong with the hot-wire cutting. Stuff like, don't use balsa as a template, its too soft, it'll burn & the wire will snag on it. Use something harder/heat proof. Stick guide T-pins in the leading & trailing edge so the wire has somewhere to rest during the start & exit. Don't cut the spar slot with the wire. All great advice, thank you.
|Oct 02, 2012, 08:23 PM|
After a little head-scratching I came up with an effective way of squaring up the fuselage to my workbench before attaching the tail...
This should result in a nice level tail that should align with the wing once that's done (waiting on a longer CF wing-rod to arrive)...
The rudder hinge was damaged in a nose-over a while back. I removed it so I could make a proper repair but having it off of there got me to thinking, maybe I should take this opportunity to enlarge the rudder a little...
A fat bulbous nose section, a short-coupled tail-moment & an extended wing are all conspiring to make this puppy a little lacking in yaw authority. More rudder area can only help. So I think that's what I'm going to do, make a slightly larger rudder...
Now that the tail's on I can move ahead & get the rudder & elevator servos mounted & functional. That'll have to wait for the glue to dry though, not sure I'll get to that tonight. We'll have to see.
|Oct 02, 2012, 11:21 PM|
Well I got a little more done tonight after all. Here's the new enlarged rudder...
Figuring a larger surface area will translate into more stress I'm reinforcing the control-horn/tail-wheel area...
Reinforcing glued in place...
I think that should help her track nicely while maintaining the scale tail's looks...
I'll put a few coats of paint on her (won't bore you folks with that process) & that'll do for today.
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