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Search: Posts Made By: Bob Kuykendall
Forum: RV-8/8A 10-17-2020, 09:06 PM
Replies: 9
Views: 2,925
Posted By Bob Kuykendall
Here's a quick guide;...

Here's a quick guide;


http://www.hpaircraft.net/rv8/nut_test2b.jpg

See Steve Smith's "Breaking News" thread for details.

--Bob K.
Forum: RV-8/8A 06-17-2020, 05:54 PM
Replies: 9
Views: 2,925
Posted By Bob Kuykendall
I would recommend sending a cheap endoscope down...

I would recommend sending a cheap endoscope down the tower and seeing what type of nuts are there. If they're the MS21042-6 or NAS679A6 nuts, I would recommend replacing the bolts with NAS6606-27 and...
Forum: RV General Discussion/News 01-27-2020, 05:22 PM
Replies: 28
Views: 3,724
Posted By Bob Kuykendall
Fair enough. When the market is right, that...

Fair enough.



When the market is right, that often works. After you account for business expenses and opportunity costs, the value of the labor sometimes even approaches minimum wage.

My take is...
Forum: RV models of the future (RV-??) 01-22-2020, 05:45 PM
Replies: 36
Views: 20,239
Posted By Bob Kuykendall
Maybe the RV-15 should be a well-designed trailer...

Maybe the RV-15 should be a well-designed trailer for the RV-12.
Forum: RV General Discussion/News 01-22-2020, 05:19 PM
Replies: 8
Views: 1,879
Posted By Bob Kuykendall
I'd suggest at least 33oz thick. In my shop we'd...

I'd suggest at least 33oz thick. In my shop we'd probably throw down some clear gelcoat, one ply of pretty 6oz cloth, then three plies of whatever 12oz is lying around.

--Bob K.
Forum: RV General Discussion/News 01-08-2020, 12:59 PM
Replies: 34
Views: 9,142
Posted By Bob Kuykendall
Not that weekend, but in the days leading up to...

Not that weekend, but in the days leading up to it, Steve Smith flew me from Ashland down to Montague in his RV-8 to see the skunk works shop where he and Bob Mills are making the tapered carbon...
Forum: RV-8/8A 01-06-2020, 03:24 PM
Replies: 127
Views: 70,222
Posted By Bob Kuykendall
Still tight!

...Last weekend Steve (scsmith) and I checked the torque on his RV-8 gear leg nuts. They hadn't budged any since we last checked them, and in fact hadn't budged significantly since the original...
Forum: RV-12/RV-12iS 02-28-2019, 04:41 PM
Replies: 18
Views: 5,250
Posted By Bob Kuykendall
If you want a real scare, read the warning labels...

If you want a real scare, read the warning labels on rock climbing gear. Nothing gets your attention like a carabiner with a red warning sticker that says "YOU MAY DIE TODAY."

Fortunately, I don't...
Forum: RV-14 01-15-2019, 11:33 AM
Replies: 37
Views: 8,495
Posted By Bob Kuykendall
Someone should make a sticky note about 6-32...

Someone should make a sticky note about 6-32 taps. Because of their combination of small diameter and (relatively) coarse threads, they are the taps most likely to break.
Forum: RV-10 12-18-2018, 06:33 PM
Replies: 12
Views: 2,457
Posted By Bob Kuykendall
Just so! It'd be interesting to try to control...

Just so! It'd be interesting to try to control the variables and get an apples to apples comparison.
Forum: RV-10 12-18-2018, 05:00 PM
Replies: 12
Views: 2,457
Posted By Bob Kuykendall
Well, maybe. At issue here is not the panel...

Well, maybe.

At issue here is not the panel stiffness (resistance to out of plane loads), but its shear stiffness, for which honeycomb or other sandwich core is pretty much immaterial. As such, the...
Forum: RV General Discussion/News 12-13-2018, 11:36 AM
Replies: 5
Views: 862
Posted By Bob Kuykendall
Probably Cleveland. But if it turns out not,...

Probably Cleveland. But if it turns out not, given its vintage and sand cast appearance, it might be a Cleveland clone made by Fred Rosenhan way back in the day.

Fred was better known for the...
Forum: RV General Discussion/News 11-13-2018, 04:39 PM
Replies: 14
Views: 2,764
Posted By Bob Kuykendall
I'm going to respectfully disagree. I think that...

I'm going to respectfully disagree. I think that 7725, sometimes called "Rutan BID," or more accurately "Jiran BID," or by it's Interglas equivalent 92125, is the best thing for this. It drapes well,...
Forum: RV-10 10-09-2018, 05:02 PM
Replies: 22
Views: 3,773
Posted By Bob Kuykendall
I strongly recommend that if you want to use...

I strongly recommend that if you want to use carbon, you put down at least one ply of fiberglass to separate the carbon from the aluminum. Epoxy can absorb and retain a tiny bit of water, and the...
Forum: Fiberglass 10-05-2018, 04:26 PM
Replies: 7
Views: 7,685
Posted By Bob Kuykendall
I could make you one. I helped Steve Smith...

I could make you one. I helped Steve Smith install anchors for a pod in the belly of his RV-8, but we never got around to building a pod. Feel free to look me up off-forum.

--Bob K.
Forum: RV-12/RV-12iS 10-05-2018, 04:21 PM
Replies: 4
Views: 1,613
Posted By Bob Kuykendall
Just so; it's more a measure of cable and...

Just so; it's more a measure of cable and airframe stiffness than anything else.
Forum: Primers 10-04-2018, 12:19 PM
Replies: 18
Views: 3,226
Posted By Bob Kuykendall
BTW, in my shop we generally keep two or three...

BTW, in my shop we generally keep two or three brand new HF spray guns on the shelf and ready to go. We usually break out a new one for any big spray (in-mold primer for wings or fuselage), when the...
Forum: RV General Discussion/News 10-03-2018, 12:59 PM
Replies: 43
Views: 9,392
Posted By Bob Kuykendall
The titanium was made in the heart of some...

The titanium was made in the heart of some long-forgotten star, whose last glimmer of nova-shed brilliance has escaped the edge of our galaxy.

Russia just mined the ore and turned it into ingots to...
Forum: RV General Discussion/News 10-02-2018, 05:04 PM
Replies: 43
Views: 9,392
Posted By Bob Kuykendall
A while back I bought a bunch of...

A while back I bought a bunch of attractively-priced 4130 from one of the big US aircraft materials places. It was mill marked as having been made in China. It seemed every bit as strong as all the...
Forum: RV-8/8A 09-05-2018, 04:53 PM
Replies: 23
Views: 6,589
Posted By Bob Kuykendall
Good on you for using the high-strength nuts! Are...

Good on you for using the high-strength nuts! Are those what come in the kit these days, or did you swap them out yourself?
Forum: Fiberglass 08-10-2018, 01:21 PM
Replies: 11
Views: 7,678
Posted By Bob Kuykendall
...Also known as straight TETA, Is hands-down the...

...Also known as straight TETA, Is hands-down the most sensitizing hardener I have ever used. Back in the bad old days we used a lot of TETA with Epon 815C resin, a mix we came to call "Redeye." Now...
Forum: Safety 07-19-2018, 12:54 PM
Replies: 13
Views: 2,897
Posted By Bob Kuykendall
It seems like your question boils down to, can...

It seems like your question boils down to, can you trust whomever did the pre-buy?

They are telling you the repair would be difficult, which is basically saying it is the same as complex and...
Forum: COMM 06-21-2018, 12:35 PM
Replies: 7
Views: 1,152
Posted By Bob Kuykendall
It looks like this one has pretty much been...

It looks like this one has pretty much been covered:

* Wingtip-mounted com antennas don't really have enough room for the height of a proper 1/4-wave whip or dipole.

* Com signals, especially with...
Forum: RV General Discussion/News 06-13-2018, 11:16 AM
Replies: 14
Views: 3,182
Posted By Bob Kuykendall
The EAA's official position:...

The EAA's official position: (https://www.eaa.org/en/eaa/aviation-communities-and-interests/homebuilt-aircraft-and-homebuilt-aircraft-kits/frequently-asked-questions/non-builder-maintenance)



--Bob...
Forum: Safety 06-07-2018, 11:36 AM
Replies: 52
Views: 9,727
Posted By Bob Kuykendall
Not to argue or dogpile this issue, but rather to...

Not to argue or dogpile this issue, but rather to add some context for new builders as to why we find so many control surface hinge jam nuts loose:

When you're fitting the control surfaces, the...
Forum: Safety 06-04-2018, 06:10 PM
Replies: 52
Views: 9,727
Posted By Bob Kuykendall
The temptation might be to look at this as an...

The temptation might be to look at this as an issue of the jam nuts preventing the rod ends from unthreading themselves. You'd see that the angle brackets on the stabilizer prevent the rod end from...
Forum: RV-14 06-03-2018, 11:08 PM
Replies: 3
Views: 1,666
Posted By Bob Kuykendall
I'm pretty sure nothing in the Vans world except...

I'm pretty sure nothing in the Vans world except wing twist (or lack thereof) is specified down to the fractional degree. As suggested Tom023, I suspect that that's -5˚, not -.5˚.

--Bob K.
Forum: Autopilots 05-22-2018, 12:23 PM
Replies: 32
Views: 5,267
Posted By Bob Kuykendall
I'd consider that screw a candidate for...

I'd consider that screw a candidate for investigation if it was software configurable.
Forum: RV General Discussion/News 05-08-2018, 04:32 PM
Replies: 39
Views: 6,551
Posted By Bob Kuykendall
It's actually 15%, and appears to be still in...

It's actually 15%, and appears to be still in effect:

Title 14 Chapter I Subchapter F Part 91 Subpart D §91.323...
Forum: RV General Discussion/News 05-08-2018, 01:07 PM
Replies: 39
Views: 6,551
Posted By Bob Kuykendall
In my official capacity as an EAA Technical...

In my official capacity as an EAA Technical Counselor, I am obligated to advise you to stick with the maximum gross weights specified by the kit manufacturer.

I suggest you deviate from those...
Forum: RV General Discussion/News 05-07-2018, 07:38 PM
Replies: 39
Views: 6,551
Posted By Bob Kuykendall
Vans position on this is pretty well...

Vans position on this is pretty well established:

https://www.facebook.com/notes/vans-aircraft-inc/what-price-a-masterpiece-by-dick-vangrunsven/237594966250883
Forum: RV-8/8A 05-07-2018, 03:38 PM
Replies: 127
Views: 70,222
Posted By Bob Kuykendall
Garden-variety AN hardware is probably adequate...

Garden-variety AN hardware is probably adequate for the RV-12. It is a lighter airplane with shorter landing gear, so the moment applied to the gear leg attachments is substantially smaller than on...
Forum: RV-8/8A 05-05-2018, 08:38 PM
Replies: 127
Views: 70,222
Posted By Bob Kuykendall
I just saw a post on the Van's builder's Facebook...

I just saw a post on the Van's builder's Facebook page complaining that the landing gear nuts ought to be castellated with cotter pins to keep them from loosening. Steve's analysis and our tests make...
Forum: Alternative Engines 04-10-2018, 04:01 PM
Replies: 45
Views: 11,225
Posted By Bob Kuykendall
The subject of my favoritest scathing review by...

The subject of my favoritest scathing review by Alfredo Scotti:

http://www.seqair.com/Other/PFM/PorschePFM.html

[OT] BTW, didja see Brad on the cover of March 2018 Soaring Magazine? Nice to see him...
Forum: Alternative Engines 04-09-2018, 05:22 PM
Replies: 45
Views: 11,225
Posted By Bob Kuykendall
Does that include a 0.8 correction factor?

Does that include a 0.8 correction factor?
Forum: RV General Discussion/News 03-07-2018, 03:56 PM
Replies: 10
Views: 1,796
Posted By Bob Kuykendall
You could install clean coal powered lights and...

You could install clean coal powered lights and apply for a subsidy. Just a thought.
Forum: RV General Discussion/News 02-20-2018, 09:47 AM
Replies: 27
Views: 19,770
Posted By Bob Kuykendall
FYI all, this thread was resurrected after about...

FYI all, this thread was resurrected after about 11 years of slumber. So please don't expect responses from the original participants.
Forum: RV Photo/Video URLs 02-14-2018, 12:35 PM
Replies: 7
Views: 2,694
Posted By Bob Kuykendall
A once in a lifetime experience. I'm a...

A once in a lifetime experience. I'm a professional writer, and I haven't the right words for what we saw and felt.

Okay, maybe twice in a lifetime, if I make it to the 2024 pass.
Forum: RV Photo/Video URLs 02-13-2018, 12:58 PM
Replies: 7
Views: 2,694
Posted By Bob Kuykendall
I've seen it, it's pretty good. But it's been...

I've seen it, it's pretty good. But it's been eclipsed.
Forum: RV General Discussion/News 12-31-2017, 12:44 PM
Replies: 55
Views: 30,622
Posted By Bob Kuykendall
For the curious, and for folks who just like to...

For the curious, and for folks who just like to see things go bang, here is the YouTube video of the spar coupon static test:

https://www.youtube.com/watch?v=BBeTSSfe_3Q

For this test, the stresses...
Forum: California 12-14-2017, 09:40 PM
Replies: 1
Views: 712
Posted By Bob Kuykendall
Will build for fun weekday evenings SF South Bay area

I stay in Mountain View or Sunnyvale four nights a week, and I wouldn't mind helping out on a RV project in MV, S'vale, San Jose, or Santa Clara while I'm down here.

I have helped build an RV-8 with...
Forum: RV General Discussion/News 12-01-2017, 01:31 PM
Replies: 85
Views: 22,379
Posted By Bob Kuykendall
Talking We do happen to have that tapered RV wing under...

We do happen to have that tapered RV wing under development, designed by the guy who developed the RV-10 and RV-14 wing profile... ;)
Forum: RV General Discussion/News 11-29-2017, 04:53 PM
Replies: 8
Views: 1,593
Posted By Bob Kuykendall
Talking 0.8 Correction factor in three, two, one...

0.8 Correction factor in three, two, one...
Forum: RV General Discussion/News 11-29-2017, 04:50 PM
Replies: 85
Views: 22,379
Posted By Bob Kuykendall
How about an ELSA amphib equivalent to the Icon...

How about an ELSA amphib equivalent to the Icon A5? They could leverage most of the RV-12 wing, use their matched-hole construction for the rest of the airframe, and maybe a fiberglass or carbon...
Forum: RV-7/7A 11-22-2017, 10:56 AM
Replies: 9
Views: 2,434
Posted By Bob Kuykendall
I do that in exactly one place on the HP-24 kit...

I do that in exactly one place on the HP-24 kit sailplane. Well, two places, one in each wing. Some notes and commentary:

* The place where I use the turnbuckle arrangement is to set the downlock...
Forum: Alternative Engines 11-21-2017, 10:03 AM
Replies: 79
Views: 27,752
Posted By Bob Kuykendall
Add engine designer Jack Kane to the naysayers...

Add engine designer Jack Kane to the naysayers column. (http://epi-eng.com/aircraft_engine_conversions/evaluating_a_conversion.htm)
Forum: RV-9/9A 11-20-2017, 05:25 PM
Replies: 11
Views: 1,941
Posted By Bob Kuykendall
Of course, you could just drill a new hole in the...

Of course, you could just drill a new hole in the steel handle so that it is the mirror image of how it is now. But then this RV would be different from every other RV in terms of which way you twist...
Forum: RV-8/8A 10-25-2017, 04:18 PM
Replies: 9
Views: 1,503
Posted By Bob Kuykendall
Well, more like affects wing shaking itself off...

Well, more like affects wing shaking itself off of the airplane.

Not to dogpile this, but mass balancing is pretty serious business, and you mess with what's there at your peril.

I think that way...
Forum: RV-8/8A 10-07-2017, 10:39 AM
Replies: 55
Views: 19,366
Posted By Bob Kuykendall
Here's the thread...

Here's the thread (http://www.vansairforce.com/community/showpost.php?p=320444&postcount=1) where Steve Smith and I showed that it pays to use good hardware on the landing gear clamps.
Forum: RV General Discussion/News 02-22-2017, 06:46 PM
Replies: 22
Views: 9,852
Posted By Bob Kuykendall
Thanks, nicely done!

Thanks, nicely done!
Forum: RV General Discussion/News 01-02-2017, 12:01 PM
Replies: 12
Views: 2,492
Posted By Bob Kuykendall
Looks like a homemade brass end piece. 3/8" brass...

Looks like a homemade brass end piece. 3/8" brass rod, a shop lathe, and about ten minutes oughta do it.
Forum: RV General Discussion/News 12-22-2016, 06:56 PM
Replies: 18
51%
Views: 6,080
Posted By Bob Kuykendall
As I recall, there is nothing in the rules that...

As I recall, there is nothing in the rules that says they have to be people. I think if you can train ferrets to do the work, it's fine. You just can't pay the ferrets--that would count as commercial...
Forum: Rocket 12-07-2016, 01:41 PM
Replies: 78
Views: 42,501
Posted By Bob Kuykendall
And anyhow, my wing is much better than the Czech...

And anyhow, my wing is much better than the Czech tapered wing. It is being developed by Steve Smith, who designed the RV-10 wing profile for Van.
Forum: Rocket 12-06-2016, 05:52 PM
Replies: 78
Views: 42,501
Posted By Bob Kuykendall
Let me know when you're ready for a tapered wing...

Let me know when you're ready for a tapered wing for it.
Forum: RV General Discussion/News 11-30-2016, 11:57 AM
Replies: 22
Views: 4,903
Posted By Bob Kuykendall
Just as a data point, for my gliders I use 1/8"...

Just as a data point, for my gliders I use 1/8" OD Nylaflow tubing for the entire brake circuit. In areas where the tubing gets flexed on gear actuation or is subject to abrasion, I armor it by...
Forum: RV-8/8A 11-29-2016, 10:28 PM
Replies: 13
Views: 5,655
Posted By Bob Kuykendall
I sure wouldn't. It's pretty easy for the main...

I sure wouldn't. It's pretty easy for the main gear axle station to be a half inch off, and that can make a pretty big difference in the CG location. In the HP-series gliders I support I have seen...
Forum: Canada 11-18-2016, 01:00 PM
Replies: 9
Views: 3,584
Posted By Bob Kuykendall
With or without the 0.8 correction factor?

With or without the 0.8 correction factor?
Forum: Safety 11-04-2016, 04:19 PM
Replies: 39
Views: 15,007
Posted By Bob Kuykendall
I hope I'm not the only one to observe that there...

I hope I'm not the only one to observe that there is perhaps a tiny bit of irony to saying "Don't try this at home!" in a community dedicated to building airplanes at home...

Anyhow, the rubric I...
Forum: RV-8/8A 11-01-2016, 05:51 PM
Replies: 8
Views: 4,060
Posted By Bob Kuykendall
[partially off-topic] It's been my experience...

[partially off-topic]

It's been my experience that plexi does strange things when you heat it up on its own. One of the things I make is sliding windows for bubble canopies, and I've found that you...
Forum: Fiberglass 10-26-2016, 12:31 PM
Replies: 11
Views: 8,271
Posted By Bob Kuykendall
They haircut easier if you do it while the...

They haircut easier if you do it while the plastic wrapper is still on. We use our open throat shear for this; one snip and done.

--Bob K.
Forum: Fiberglass 10-26-2016, 12:27 PM
Replies: 11
Views: 8,271
Posted By Bob Kuykendall
My condolences. The last time someone tried to...

My condolences. The last time someone tried to give me a hundred yard roll of 7781 I sent them home with it to save myself the trouble of throwing it away. It is hateful undrapey stuff with a tight...
Forum: RV-8/8A 10-25-2016, 11:22 AM
Replies: 16
Views: 8,733
Posted By Bob Kuykendall
The primer on the right forward fuselage suggests...

The primer on the right forward fuselage suggests there might have been a repair to the right side gear tower. I would look carefully in that area for wrinkled metal, including under the inspection...
Forum: RV-9/9A 09-30-2016, 04:58 PM
Replies: 10
Views: 2,644
Posted By Bob Kuykendall
Having done a handful of control system design, I...

Having done a handful of control system design, I can say that a tiny amount of interaction between the stick axes is almost unavoidable unless you go to heroics to separate them. In practice, the...
Forum: Alternative Engines 09-29-2016, 11:12 AM
Replies: 15
Views: 9,854
Posted By Bob Kuykendall
Direct link to .pdf...

Direct link to .pdf doc:

http://www.autopsrus.com/ckfinder/userfiles/files/Home%20Built%20Airplane%20Response.pdf

Wow, I sure got a lot of airplay out of that one!
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