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  #1  
Old 03-26-2020, 02:42 PM
LettersFromFlyoverCountry's Avatar
LettersFromFlyoverCountry LettersFromFlyoverCountry is offline
 
Join Date: Jan 2005
Location: St. Paul, MN.
Posts: 4,821
Default When is good enough good enough?

I got a really nice note this morning from a builder whom I won't identify because I don't have his permission to who stumbled across a message in the middle of an old,old thread that had asked a question about whether something is good enough. In response in the middle of that thread, I said he had reached a point that old builders eventually must, and I referenced an article that was in the RV Builder's Hotline that I wrote.

That web link, of course, longer works, but I saved the whole site on my computer and I was able to find the old article (which I'd forgotten about, of course) and I think I'll start putting some of them up on my blog.

And maybe it'll be helpful here so unless Doug objects, I reprint the entire Christmas Eve 2006 article here.


This article, which I wrote, first appeared in the now defunct RV Builder's Hotline. Fortunately, I still have the entire site archived on my computer.

(Dec. 24, 2006) -- One of the things I enjoy about building my RV is how the project has made me particular about approaching various tasks in search of perfection. One of the things about building my RV that has frustrated me no end is how rarely I find it.


A few weeks ago I was wandering along the flight line at the Minnesota Wing of Van's Air Force meeting, looking at some truly fine examples of workmanship. My friend Warren Starkebaum was with me.

I was telling Warren about my experience building the "new" rudder on my 7 last winter (the one with the AEX wedge trailing edge rather than the single-piece bent skin trailing edge). "I worked very carefully to get it perfectly straight and it came out OK. "It didn't come out perfect, but it came out OK," I said. But I wasn't finished telling the story.

"And then I went to Oshkosh last summer and looked at all of these beautiful RVs," I continued. "And I looked at all of the trailing edges on the rudders and they were dead-on straight. Man, did I feel like the world's worst builder after that."

As we looked over Paul Hove's beautiful (and almost ready to fly) RV-7A, I was waiting for Warren to lecture me on stuff I already knew or should've known. But Warren's not the type of guy to rub it in.

"You gotta stop looking at other people's planes so closely," he said.

We only see each other a couple of times a year, even though we live fairly close in the Twin Cities and have a lot in common, RV-wise, but that's why I consider him my best RV-building bud.

Unfortunately, even if I stopped looking at other people's RVs so closely, I'd still have to answer to the one person who insists on perfect execution. Me. For all of the questions we see regularly on the bulletin boards from "newbies," this, it seems to me, is the thing every builder needs to learn: when is "good enough" good enough? And who do we rely on to decide?

Sure, we have rivet gauges, AC43.13, an occasional tech counselor visit, and the admonishment of Van's in the instructions and on the plans to guide us, but sometimes we have to answer to a higher authority and sometimes we don't like ourselves much because of it. Sometimes we're like the 4th grade piano instructor who says "again" after you just played a flawless version of "Jingle Bells."

The favorite expression on bulletin boards is "build on!" when someone posts a question about a task that he or she has questions about. And, yes, this is a person learning when good enough is good enough. But most of us on those boards aren't engineers and when you get right down to it, the place to go for these answers is actually the designer of the plane -- Van's Aircraft. Aside from the convenience of the boards, I contend that one of the reasons we don't rely on Van's expertise more often, is we're not sure we want to hear the answer to some questions.

It's true that we'd rather hear "build on!" than "again." But I've found over the course of this project that "build on" doesn't make the little voice in my head that says "again" go away.

Some things are just too important to ignore that voice. And quite often, you could just kick that voice's rear.



It happened to me this morning, as a matter of fact. You may recall from my wing-mating experience last summer, that I stupidly didn't drill the rear spar bolt hole straight on the right wing, despite my attempt to use a drill bushing to get it just right in that hard-to-reach spot for drill bushings. Here's a note: eyeball it! Van's said "be careful" here. I was careful. I still screwed it up.
After I installed the bolt and saw that it didn't go in straight, I, of course, kicked myself for again messing up. But there's no easy"again" with this part. And Van's makes it pretty clear that a 5/8" edge distance is required here. I immediately checked the edge distance on the fuselage "forks". Seven-eighths inches. "Whew," I said to myself.

I might not be perfect, but I am careful. And now that winter is here -- sort of -- and I have an unheated garage with an airplane in it, I usually spend much of the winter checking all of the instructions again, pouring over the plane parts, and taking another look at every part I've built, reassessing whether it's "good enough." I also take care of some of the little dinky things that I figured last summer I could take care of later -- nutplates in the wing skins for the wing fairing, and the shims for the not-straight bolt etc.

As I was making one of the shims yesterday, I caught myself several times thinking it was "good enough." The bolt head was just about sitting flat against the shim and probably would be fine with a washer underneath the head. But each time I caught myself. "Good enough is not perfect," I said. I figured that someone would tell me to 'build on!", and they'd probably be right. But someone would know that it wasn't up to the best I could do. Me. So I continued until I got the shim perfect.

As I reviewed the plans, I knew I'd have to get a larger bolt than that which the plans called for, and I noticed the plans called for three washers. And so I was on the RV Builders Yahoogroup (Van's was closed) asking about their distribution when it hit me: "You measured the edge distance on the fuselage 'forks,' but did you measure the edge distance on the rear spar doubler?" I thought to myself.

I had -- once again -- the sinking feeling of a mistake. The admonishments -- many admonishments -- for the 5/8" edge distance zipped through my mind and I couldn't remember measuring the rear spar (the edge is blocked from view when you're actually drilling). I grabbed the Stanley 6" ruler out of the garage, and headed to the basement to check.

I held my breath as I measured from the center of the hole: 19/32" on the rear side, 18/32" on the forward side. Oh no!

Unless, of couse, I slid the ruler slighly outboard a bit. "Why not," I said, "maybe I'm not quite centered on the hole? Or maybe I'm not quite seeing the edge lining up with the 19. Maybe it really is the 20?"

But the voice in my head said "no." The voice in my head said "close enough" is not "good enough."

Stuff like that can really ruin a good day; especially since Van's is closed and there's nobody to tell me what to do. And so, like a (U who's been bad wondering what will happen when Dad gets home, I'm spending the weekend -- Christmas weekend of all things -- with a hundred different scenarios going through my mind. If Van's says rebuild the wing to get a clean doubler in there, I will. If they say "build on," I will. If there's something in between those two they want me to do, I'll do it.

What I won't do is listen to any voice in my head that says it's "good enough," if in my heart I know better.

(Update from the present: I ended up taking the doublers off the wing and replacing and removing the forks from the fuselage and replacing them too and repeating the process. I got it right the second time.)
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Bob Collins
St. Paul, MN.
Blog: Letters From Flyover Country
RV-12iS Powerplant kit
N612EF Builder log (EAA Builder log)
Last article: "Gonna Finish This Sucker" (Kitplanes)

Last edited by LettersFromFlyoverCountry : 03-26-2020 at 02:55 PM.
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  #2  
Old 03-26-2020, 04:32 PM
swjohnsey swjohnsey is online now
 
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Location: Kingsville, TX
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Default

I always wondered if the Wright Flyer was good enough or perfect. Same for the Spirit of St. Louis.
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  #3  
Old 03-26-2020, 04:55 PM
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wirejock wirejock is offline
 
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Location: Estes Park, CO
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Default Good enough

I did it too. Missed edge distance by .009".
It actually worked out really cool. It took months because of all the head scratching.
In the end, I drilled out the rear spar carry through.
I match drilled the new one using the old one plus an adjustment for the edge distance error and incidence adjustment to correct for the original install.
The new carry through was then inserted and floating. Wings installed. Rear bolts installed.
Then the floating assembly was adjusted port/starboard and up/down till all the measurements were exactly right. Better than the first time.
Next a couple holes each side were match drilled and the whole thing disassembled.
Clamp the two carry through spars together using the matching holes as guides and match drill all the other holes.
Reassemble and rivet the carry through spars.
Reinstall the wings.
Measure.
Right on the money. Good enoughi.
It ate a huge chunk of time but I sleep better and the measurements ended up even better than the original install.
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Larry Larson
Estes Park, CO
http://wirejockrv7a.blogspot.com
wirejock at yahoo dot com
Donated 01/01/2021, plus a little extra.
RV-7A #73391, N511RV reserved (2,000+ hours)
HS SB, empennage, tanks, wings, fuse, working finishing kit
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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  #4  
Old 03-26-2020, 06:43 PM
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LettersFromFlyoverCountry LettersFromFlyoverCountry is offline
 
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Location: St. Paul, MN.
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Default

Quote:
Originally Posted by swjohnsey View Post
I always wondered if the Wright Flyer was good enough or perfect. Same for the Spirit of St. Louis.

Given the number of things that broke in the Wright Flyer before it flew a few feet, no.
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Bob Collins
St. Paul, MN.
Blog: Letters From Flyover Country
RV-12iS Powerplant kit
N612EF Builder log (EAA Builder log)
Last article: "Gonna Finish This Sucker" (Kitplanes)
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  #5  
Old 03-26-2020, 06:43 PM
Girraf Girraf is offline
 
Join Date: Dec 2017
Location: Southern Maryland
Posts: 157
Default

I ask myself whether my work is good enough everyday I pick up a tool. I've learned to accept less than perfect, but I will try, try again, until the likelihood of destroying the part exceeds the likelihood of getting better results.

Just happened today that I reset a single rivet in the very TE of the aileron rib 3 times when in hindsight, I should have left it well enough alone the first time. None of them were particularly bad, but they could have been better, and each successive result just got more challenging to achieve desired results. I finally ended up accepting a quality that was less than I wanted. Given that it was the last rivet on the entire part, it wasn't worth risking the skin with anymore attempts to reach my standard on that one rivet.
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  #6  
Old 03-26-2020, 07:52 PM
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PaulvS PaulvS is offline
 
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Location: Western Australia
Posts: 559
Default objective

It can be hard to know what is good enough, as this is largely a learning experience.

If the project gets finished and flies safely and well, and the builder feels satisfied, then it is probably "good enough".

But if perfection gets in the way of ever completing, then that would seem to defeat the purpose, and it wouldn't be good enough!
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Building RV-6A #22320 O-320 FP. Wings and tail complete, working on fuselage
Flying my Aeroprakt A-22 STOL and the aero club's RV-9A while I build
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  #7  
Old 03-26-2020, 08:14 PM
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LettersFromFlyoverCountry LettersFromFlyoverCountry is offline
 
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Default

The question I pose isn't about perfection. It's about understanding when good enough is good enough and being true to that standard and yourself.

It might be the most important skill.
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Bob Collins
St. Paul, MN.
Blog: Letters From Flyover Country
RV-12iS Powerplant kit
N612EF Builder log (EAA Builder log)
Last article: "Gonna Finish This Sucker" (Kitplanes)

Last edited by LettersFromFlyoverCountry : 03-26-2020 at 08:20 PM.
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  #8  
Old 03-27-2020, 03:34 AM
Shado Shado is offline
 
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Location: Princeton, New Jersey
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I remember a discussion somewhere on the forum that the important thought on whether something is good enough is also related to categorizing it as a "cosmetic" vs. "safety" mistake. Is this not related to this discussion? In the case of a "cosmetic" mistake, it would be up to the builder to determine if a "do-over" is warranted or "build-on". In the case of a safety mistake then it would seem to not be "go-enough". So I would submit that part of the challenge is to understand the eventual consequence of the imperfection/mistake (If there are no consequences, then is it "good-enough?). This could go a long way to determining what to do. However I can see the same issues as was just presented above. Who do you go to for this information?
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Model: RV14a (Working on Tail Kit) (QB Fuselage, QB Wings and Finishing Kit arrived)
Engine: Lycoming IO-390 Thunderbolt
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  #9  
Old 03-27-2020, 04:55 AM
leok leok is offline
 
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Location: Clarkston, MI
Posts: 406
Default Confidence

When the plane is out in the sun, and I stand back far enough to take it all in, I marvel that I built it. Then I move up to examine each surface and can see each slip of the rivet gun, each dimple that could have been slightly deeper, each flaw in the ?temporary? pain job I did. I have gained a whole new appreciation for anyone who polishes instead of painting their airplane. No way to hide those inevitable slips.

When I?m in the air, that?s when I think of perfection on the bolts, edge distances, torques and a thousand other details. What does it take to have confidence to set out across the country side, away from the runway below. Believe me, you think of that on the second and third flights when you start to go a little farther out that gliding distance to the runway. What does it take to have confidence to take my wife, kids or a friend up for a ride. That answers the question for me when ?good enough? is indeed ?good enough?.

Cosmetics is what gets you those satisfying comments on the ground.

Confidence comes from knowing that you never compromised, always asked questions when uncertain, always made sure it was right when it was something that counted when you are in the air.
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  #10  
Old 03-27-2020, 09:21 AM
Maxrate Maxrate is offline
 
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Location: League city, TX
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Default

I?ve enjoyed this thread. The fact that we?re even discussing this proves we live in the greatest country on earth. Thank you to all those who gave to procure these freedoms we enjoy!
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2021 Donation gladly paid..
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