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Author Topic: The science of refinish  (Read 8442 times)

Offline Randy Powell

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The science of refinish
« on: March 20, 2012, 12:47:00 PM »
I've sort of decided that I have a whole stable of planes, most with various problems. Some fixable, some not so much. So for the lost causes, I plan to salvage them and get them out of the rack. For the fixable stuff, I am (gasp!) going to fix them. First up is a refinish of my 3rd Slider. It was a very straight, very light airframe that fell victim to both a local rodent and my heavy finger on the paint trigger. So, I plan to strip it back down to bare wood, fix a couple of things and refinish it. Same for another plane I have (a USA-1 variant). Another plane I have needs new flaps and a home. I may look for a suitable recipient (Perhaps Shultzie).

So, no new planes, but some fixes in the works. This will all be after I fix the Avenger.
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Offline Mark Scarborough

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Re: The science of refinish
« Reply #1 on: March 20, 2012, 12:59:22 PM »
So Randy, are you doing a strip , repair, and refinish on the Avenger, or just make repairs as needed,,
inquireing minds want to know,,

Not sure what will go next in my world,, I know finishing the 109 is a priority,,

Good to see you tidy up the stable,, maybe have a couple back ups for those "moments"
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Offline Bill Little

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Re: The science of refinish
« Reply #2 on: March 20, 2012, 01:43:59 PM »
HI Brother Randy,

With the present state I am in, I have thought about doing the same thing.  Some say it is just easier to build a new plane, but I don't think so.  With "Dad's Stripper", the old finish comes off easily!  So I have a couple of models in line for stripping and repairs (will even lighten a few up by doing this!).  One is a Sterling Spitfire that is well built but 40 years old.  Never got too many flights on it, but will look over the controls, make the tank removable, add adj. LOs, tip weight box, etc..  The other is the Spacehound which needs new covering for sure.  Just looking at the silkspan makes it rip........  Also I can take some more weight out of it by hollowing the blocks more, etc., and the Spitfire will get the same.  Plus I am going to shed the hard plastic wheels on the Spacehound, never heard a model make so much noise on landing! ROTFLMBO!!!
Then it is on to modifying a '59 Ares to take an OS .25VF and a pipe!  (won't use it anymore in Classic)

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Re: The science of refinish
« Reply #3 on: March 20, 2012, 08:05:19 PM »
Roy DeCamara has a good write up on removing the finish on a plane in the Jan-Feb issue of SN. He shows how to remove the finish and silk span. I am doing this on a very old hanger queen that I got from a estate of a local model builder. This plane has been stored awhile. One thing that I tried was to take my heat gun and heat up the silk span on the wing. It came off real easy. I am doing a total strip using Roy's method.

At this point I am not planning on flying this plane. Just using it as a test base for working on my finishing skills.
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Offline wwwarbird

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Re: The science of refinish
« Reply #4 on: March 20, 2012, 10:19:04 PM »
 More interesting stuff from the "Powellworks". I'm definitely interested in watching some of this work. y1
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Offline Randy Powell

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Re: The science of refinish
« Reply #5 on: March 21, 2012, 11:58:23 AM »
Mark,

The Avenger will just get repaired. I can pretty much make the damage undetectable. I have to cut into it to change a couple of things in the controls (as we discussed). But I think the finish can be repaired.

The Slider 3 (the "Batplane") will get a complete refinish. The USA-1ish will also get some work and we'll fly them a bit to see what we have. The Shoe will probably get salvaged and the Slider 4 will probably either get salvaged or will find a new home.
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Offline Mark Scarborough

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Re: The science of refinish
« Reply #6 on: March 21, 2012, 12:07:49 PM »
before salvage operations begin, we should talk, I need something to fly locally that I wont hurt  :-[ everything locally to fly on is pretty rough,,, Though I am working on Gordon's suggestion as well,, ( he garauntees it will get my bottoms down,, )
of course there are others who may benefit more from your "cast offs " LOL,,
hey it was a good week despite your struggles,, I hope your overall vibe was positive from the week....
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Offline Randy Powell

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Re: The science of refinish
« Reply #7 on: March 21, 2012, 12:15:04 PM »
Mark,

Hey, if you would like the red and yellow Slider... I was thinking Tim, but if you want it...
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Offline Mark Scarborough

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Re: The science of refinish
« Reply #8 on: March 21, 2012, 12:43:25 PM »
what is it set up for power wise?
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Offline Clint Ormosen

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Re: The science of refinish
« Reply #9 on: March 21, 2012, 05:29:19 PM »
What's the advantage of stripping all the way to bare wood? If the plane had a decent finish on it to begin with, why not just get down to the covering and filler coats? Obviously, if the open bay areas are full of holes already it would be easier to recover than to patch. But the solid surfaces should be good to go once you get under the old primer, right?
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Offline Bill Little

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Re: The science of refinish
« Reply #10 on: March 21, 2012, 07:30:57 PM »
What's the advantage of stripping all the way to bare wood? If the plane had a decent finish on it to begin with, why not just get down to the covering and filler coats? Obviously, if the open bay areas are full of holes already it would be easier to recover than to patch. But the solid surfaces should be good to go once you get under the old primer, right?

HI Clint,

In my case, I can now apply a lighter, better looking finish from the bare wood up.  If it is one of "newer" models, I would not go to the bare wood.

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Offline Randy Powell

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Re: The science of refinish
« Reply #11 on: March 21, 2012, 10:26:30 PM »
Mark,

It was powered by a RO-Jett 65 with pipe.

Clint,

Well, this plane had a checkered history during finish. It has, ah, a lot of paint on it. I'll use stripper and take it down to wood then see if I can put a much lighter finish on it.
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Offline Dennis Adamisin

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Re: The science of refinish
« Reply #12 on: March 22, 2012, 05:20:02 AM »
I have two old birds I would like to strip down, so I will be watching & learning!
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Offline Randy Powell

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Re: The science of refinish
« Reply #13 on: March 22, 2012, 08:38:12 PM »
Dennis,

I've done it before. I stripped the Cobra I had after having to do a bunch of changes (besides, the original finish was a 6 day special and didn't look all that great). the process isn't too tough. A can of stripper and some patience.
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Offline Randy Powell

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Re: The science of refinish
« Reply #14 on: March 25, 2012, 03:06:29 PM »
Ok, change of plan. I got the Shoestring down and looked it over. I'm just convinced that the problem is the stab. It's got to be misaligned. so I pulled the control surfaces and took it apart and I'm going to strip it, put in a new stab and refinish it, checking the incidence and alignment as I go. It was a cool looking plane and worth trying to save. This should be fun.

I'll post pics as I go along if anyone is interested.
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Offline Will Hinton

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Re: The science of refinish
« Reply #15 on: March 25, 2012, 04:53:12 PM »
I am!  Maybe I can see better ways to do this than the last refinish I did winter before last!
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Offline Randy Powell

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Re: The science of refinish
« Reply #16 on: March 25, 2012, 07:09:43 PM »
Hi Will,

Well, here's a couple of pictures. I used Jasco 15 minute stripper. Only got the outboard wing done, but that only took about 20 minutes. Will still need some sanding to prep it for a new finish and I still have to cut the stab out and build a new one.
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Offline wwwarbird

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Re: The science of refinish
« Reply #17 on: March 25, 2012, 10:35:58 PM »
 Not using "Dad's" stripper?
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Offline Mark Scarborough

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Re: The science of refinish
« Reply #18 on: March 26, 2012, 09:32:15 AM »
Oh the one liners I could get outta this,, "Dads stripper," no she was to old and wanted to much money,,  n~

15 minute stripper that took 20 minutes, hmmm ok

but all kidding aside, I have always loved this plane Randy, I am jacked to see you rework it,, Though the repairs on the Avenger still need be made,,
keep us posted,,
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Offline Randy Powell

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Re: The science of refinish
« Reply #19 on: March 26, 2012, 10:17:32 AM »
Mark,

I'm too irritated with the Avenger right now so it got taken apart, cleaned and put in the rack. It's the headrest really. So it can cook for awhile while I think about it.
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Offline Mark Scarborough

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Re: The science of refinish
« Reply #20 on: March 26, 2012, 10:23:57 AM »
sorry to hear the frustration is winning out Randy,, but I have no doubt you will get reenergized and figure out a way to correct the headrest issue,, Still a really cool plane,,
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Offline Tim Wescott

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Re: The science of refinish
« Reply #21 on: March 26, 2012, 10:56:18 AM »
sorry to hear the frustration is winning out Randy,, but I have no doubt you will get reenergized and figure out a way to correct the headrest issue,, Still a really cool plane,,

Sometimes the best thing to do with a project is to put it in a cool, dark place and let it sit for a while.

Like wine, it'll mellow as it ages, and come out better than when it went in.
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Offline Bill Little

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Re: The science of refinish
« Reply #22 on: March 26, 2012, 11:04:09 AM »
HI Randy,

I have total faith in your abilities, so the models you are working on will come out better than before.  Again, I think that redoing a model is easier than building a new one, at least if it was built correctly.

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Offline Mark Scarborough

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Re: The science of refinish
« Reply #23 on: March 26, 2012, 11:04:34 AM »
Sometimes the best thing to do with a project is to put it in a cool, dark place and let it sit for a while.

Like wine, it'll mellow as it ages, and come out better than when it went in.
I wonder if that is why Linda keeps turning the lights out whenever she leaves a room with me in it,, hoping I will mellow with age,,
I dont think its working though,,
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Offline Tim Wescott

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Re: The science of refinish
« Reply #24 on: March 26, 2012, 11:10:31 AM »
I wonder if that is why Linda keeps turning the lights out whenever she leaves a room with me in it,, hoping I will mellow with age,,
I dont think its working though,,
If you notice her ordering a great big oaken barrel -- worry.
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Offline Randy Powell

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Re: The science of refinish
« Reply #25 on: March 26, 2012, 11:59:21 AM »
Naw, Mark. You're just a mushroom.
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Re: The science of refinish
« Reply #26 on: March 26, 2012, 12:20:18 PM »
thanks for your support guys,, it makes me all warm and tingly,,

or not,, n~
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Offline Will Hinton

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Re: The science of refinish
« Reply #27 on: March 26, 2012, 01:52:32 PM »
Errr, what is it mushrooms grow on? LL~ LL~

Randy, thanks for the info on the stripper - that's a new one to me.  I have to be so careful what I use on music instruments, I'll give this one a try to see whahoppens.  (I have a couple of junkers on hand for just that purpose.)
I'm thinking of refinishing my number one Crosswind, so will be following closely.
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Offline Randy Powell

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Re: The science of refinish
« Reply #28 on: March 26, 2012, 04:45:04 PM »
One of the problems is that I usually cover planes then put on the fillets. This eats the paint, loosens the paper so it can be peeled off (I peeled the bottom of this wing in one sheet. That was weird). It doesn't really effect the fillets, but it loosens the paper under them and allows you to just pull the fillet up with the paper. But any areas where the filler (in this case, SuperFil) is attached directly to the balsa, well, it just doesn't go anywhere. So you have to get a block out when all the paper is off and go after those areas. I will do the other wing tonight and hopefully the fuse will take up the rest of the week. Then I can block the whole thing down, cut the stab out and get the new one built, get it aligned (checking about a million times) then build new control surfaces. I suspect I will be ready to start putting the new finish on in a couple of weeks, maybe sooner.
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Offline Tim Wescott

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Re: The science of refinish
« Reply #29 on: March 26, 2012, 05:39:33 PM »
cut the stab out and get the new one built, get it aligned (checking about a million times) then build new control surfaces.

It's not the 106 checks that always get me, it's the 106 +1 operation, when I glue things together and screw it up...
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Offline Randy Powell

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Re: The science of refinish
« Reply #30 on: March 30, 2012, 08:54:33 PM »
So, I have it about half done. Getting the fillets off is fun. Cut the stab out and that went pretty well. Should be able to finish the stripping tomorrow and I can start sanding and building the new stab and control surfaces.
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Offline Randy Powell

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Re: The science of refinish
« Reply #31 on: March 31, 2012, 09:05:53 PM »
OK, the tear down is done and it's time to start rebulding.
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Offline Bill Little

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Re: The science of refinish
« Reply #32 on: April 01, 2012, 04:20:03 PM »
HI Randy,

Hopefully a new stab with proper alignment will solve the issue!

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Offline wwwarbird

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Re: The science of refinish
« Reply #33 on: April 01, 2012, 08:31:02 PM »
 Approximately how much actual time from the very beginning of the stripping process to the current "bare bones" status?
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Offline Randy Powell

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Re: The science of refinish
« Reply #34 on: April 01, 2012, 10:46:07 PM »
Wayne,

Couple of hours.

It's all sanded down now and I made a new slider (split slider for independent adjustment). Figured I'd correct a couple of things while I'm at it. The new parts are cut out and the stab is almost ready to go in. I should be ready to start finishing (or refinishing) in a few days.
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Offline wwwarbird

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Re: The science of refinish
« Reply #35 on: April 01, 2012, 11:23:41 PM »
 Wow, that's pretty quick. Makes it kind of tempting to re-do a couple of my own.
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Offline Tim Wescott

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Re: The science of refinish
« Reply #36 on: April 01, 2012, 11:40:20 PM »
Wow, that's pretty quick. Makes it kind of tempting to re-do a couple of my own.
I am often amazed at how much less time a repair takes than a rebuild from scratch.  I've taken some models that looked like they were good for nothing but shoving into the nearest garbage can, and rebuilt them in significantly less time than it would have taken to build from scratch.

Unless large parts of the model are just flat out pulverized, a repair is usually quicker than toss-and-rebuild.
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Offline Randy Powell

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Re: The science of refinish
« Reply #37 on: April 02, 2012, 11:00:19 AM »
Unless it's a ready to fly Flight Steak.    LL~
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Offline Shultzie

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Re: The science of refinish
« Reply #38 on: April 02, 2012, 11:30:18 AM »
 BW@ RANDY!
That beautiful SHOE' truly was one of the most tasty n' beautiful CLPA models that this old BADBOY (another name that I was thinkin; bout before virtually total burnout!
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Re: The science of refinish
« Reply #39 on: April 02, 2012, 11:41:57 AM »
Unless it's a ready to fly Flight Steak.    LL~

WEll played sir Randy,, well played
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Re: The science of refinish
« Reply #40 on: April 02, 2012, 12:02:23 PM »
Donnie,

yea, that's me looking down at the thing trying to figure out what was wrong with it. At least I can take my time and get it right this time.
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Offline Matt Colan

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Re: The science of refinish
« Reply #41 on: April 02, 2012, 05:13:18 PM »
Donnie,

yea, that's me looking down at the thing trying to figure out what was wrong with it. At least I can take my time and get it right this time.

So Randy, if you don't mind me asking, what was wrong with it?
Matt Colan

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Re: The science of refinish
« Reply #42 on: April 02, 2012, 10:19:33 PM »
Matt,

There's about a million words written somewhere here about it's issues. The thing refused to track. It wandered around like a drunken sailor (no, not Ty). I finally dialed in enough down thrust and down elevator to get it to track in level flight but then it wouldn't turn inside.

It's an alignment issue. After talking to a bunch of guys and having some very sharp stunt minds look at it in flight, it was decided (mostly by me) that the stab is just flat out of alignment, twisted or has demons. So that stab is now gone (here's a tip, don't use a triangular airfoiled stab no matter what the plans say) and the new one will have minor airfoil at the front and that's it and I will use 4 different incidence meters when I put the new on in.

Tonight I spent the evening car shopping. Man, I hate that.
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Offline Tim Wescott

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Re: The science of refinish
« Reply #43 on: April 02, 2012, 10:45:15 PM »
Unless it's a ready to fly Flight Steak.    LL~

Hey!!  I only changed out a few wing ribs and two other parts.
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The problem with electric is that once you get the smoke generator and sound system installed, the plane is too heavy.

Offline Allan Perret

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Re: The science of refinish
« Reply #44 on: April 03, 2012, 05:54:53 AM »
I will use 4 different incidence meters when I put the new on in.
That sounds like fun.  I would suggest you set up a simple test fixture to see if the 4 meters all agree.
Do you remember where you set the incidence on the old stab, and what incidence will you be shooting for with the new stab ? 
Allan Perret
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Offline Randy Powell

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Re: The science of refinish
« Reply #45 on: April 03, 2012, 10:41:11 AM »
Tim,

Uh huh. I seem to remember photo evidence ...

Allan,

Yea, the ones I have are adjustable and I will zero them with each other. I suspect that I managed to get negative incidence in originally partially due to the triangular airfoil stab. Anyway, I will try to put enough positive incidence in just to be sure that there is no negative incidence. I usually put a degree or so of positive incidence in.

When I can get to it, I will put the fuse back in a fuse jig and block it so that the wing is 0-0 with the thrust line then use the incidence meters to set up the stab.
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AMA 67711
 Randy Powell

Offline Allan Perret

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Re: The science of refinish
« Reply #46 on: April 03, 2012, 11:15:33 AM »
I suspect that I managed to get negative incidence in originally partially due to the triangular airfoil stab.
I had a triangular shaped stab on my RMD, no tracking issues.  To help with getting the incidence set right I made a rectangle shaped saddle around the center section for mounting in the fuse.  Posted some pictures during the build on BOR site, lost in the crash.  I still have the pics if you want to see again.
Allan Perret
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Slidell, Louisiana

Offline Tim Wescott

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Re: The science of refinish
« Reply #47 on: April 03, 2012, 12:28:38 PM »
Tim,

Uh huh. I seem to remember photo evidence ...

Fuselage, stab.  That's two parts.  Right?
AMA 64232

The problem with electric is that once you get the smoke generator and sound system installed, the plane is too heavy.

Offline Randy Powell

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Re: The science of refinish
« Reply #48 on: April 03, 2012, 03:38:35 PM »
Allan,

With a triangular airfoil stab, the margin of error as pertains to alignment is somewhat smaller than, say, a flat stab. I suspect that the stab on the Shoe was both out of alignment and twisted. Besides, it's incorrect in reference to the original. I built the first plane according to the Flying Models plan which I discovered was radically incorrect. The second used a Skylark wing (which the original used) but I foolishly used the tail from the Flying Models plan. I have since found out that the original had a flat stab. So a flat stab goes in this time.

Tim,

I suppose if you are talking major assemblies. Seems to me there are only 3. Wing, empennage and fuselage. You replaced much of two out of three.  8)
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Offline Tim Wescott

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Re: The science of refinish
« Reply #49 on: April 03, 2012, 04:59:07 PM »
Tim,

I suppose if you are talking major assemblies. Seems to me there are only 3. Wing, empennage and fuselage. You replaced much of two out of three.  8)

You make confabulation hard.
AMA 64232

The problem with electric is that once you get the smoke generator and sound system installed, the plane is too heavy.


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