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Search: Posts Made By: David Z
Forum: Painting your RV Today, 08:59 AM
Replies: 13
Views: 421
Posted By David Z
I wiped away all the sanding residue with damp...

I wiped away all the sanding residue with damp paper towels. Cleaned with isopropyl alcohol.

Water is nearly free and harmless to handle (dumped the excess water on my grass and it's not dead yet...
Forum: RV-8/8A Yesterday, 07:11 PM
Replies: 34
Views: 18,745
Posted By David Z
Do you happen to know the pressure and flow...

Do you happen to know the pressure and flow capabilities of the transfer pump from Turtle Pac? I'm trying to compare it to what I'll be using. Since you can't over-pressure the wing tanks, that's...
Forum: RV-8/8A Yesterday, 05:49 PM
Replies: 34
Views: 18,745
Posted By David Z
Dan 57: what transfer pump are using for the...

Dan 57: what transfer pump are using for the fuselage Turtle tank?

I'm assuming 3/8" transfer line from the Turtle tank and typical 1/4" vent lines?
Forum: RV-8/8A Yesterday, 02:09 PM
Replies: 34
Views: 18,745
Posted By David Z
Has anyone come up with a good solution to the...

Has anyone come up with a good solution to the accidental overfill problem? Obviously we're going to watch fuel levels and never intentionally over fill the tank. The consequence of doing that is...
Forum: RV-15 06-16-2022, 06:13 PM
Replies: 57
Views: 15,520
Posted By David Z
5 blade prop is up to the builder, not Van's....

5 blade prop is up to the builder, not Van's. However...

4 - turbine engines
1 - 1st prototype
5 - 50 passengers
X - Xtra back-country mission capable
V - Very slow

Sounds like a deHavilland...
Forum: Alternative Engines 06-16-2022, 05:04 AM
Replies: 42
Views: 3,626
Posted By David Z
UL Power is making great headway, and spending...

UL Power is making great headway, and spending dollars on marketing too. If they made a FWF kit with all the goodies that Van's offers (or better), I bet they'd sell lots. The reputation of...
Forum: RV-7/7A 06-16-2022, 04:58 AM
Replies: 1
Views: 563
Posted By David Z
My understanding of history is that the RV8 "Dash...

My understanding of history is that the RV8 "Dash 1" wing was designed for parts commonality and improvements developed from the RV7.

Essentially the RV8 "Dash 1" wing is an RV7 wing with some...
Forum: RV Building Tips/Techniques 06-13-2022, 07:13 PM
Replies: 6
Views: 787
Posted By David Z
Still do at my job. We call it "start taxi",...

Still do at my job. We call it "start taxi", "up", down" and "engines off" and have to write it down manually. Most airlines track all this remotely through electronic means.
Forum: RV-15 06-05-2022, 09:01 PM
Replies: 51
Views: 18,027
Posted By David Z
180hp on floats with the same airframe capable of...

180hp on floats with the same airframe capable of 260hp would create the fastest boat on the lake. :D Maybe a restriction of "210hp min for float equipped aircraft".
Forum: RV Building Tips/Techniques 06-05-2022, 08:58 PM
Replies: 8
Views: 469
Posted By David Z
Just for throwing another's setup out there, this...

Just for throwing another's setup out there, this is what I do.

-One bigger air line (1/2" IIRC) at 90psi for tools with motors or want fixed 90 psi. Works great for my impact wrench when changing...
Forum: RV-8/8A 06-04-2022, 07:43 PM
Replies: 5
Views: 418
Posted By David Z
I'm actually building a new bracket right now for...

I'm actually building a new bracket right now for my Newton duplex valve.
Forum: RV models of the future (RV-??) 05-28-2022, 04:53 PM
Replies: 53
Views: 8,438
Posted By David Z
Between this thread and the RV-twin thread...

Between this thread and the RV-twin thread (https://vansairforce.net/community/showthread.php?t=202652), it's got me thinking of the Velocity Twin. While I'm sure they're great planes, not sure how...
Forum: Safety 05-22-2022, 07:15 PM
Replies: 3
Views: 1,245
Posted By David Z
Been flying the work plane a lot recently too. It...

Been flying the work plane a lot recently too. It has pneumatic wing deice boots. They've been rather "crusty" as of late too. By crusty, I mean ice bits that aren't entirely removed by the boot...
Forum: RV General Discussion/News 05-21-2022, 11:45 AM
Replies: 35
Views: 6,348
Posted By David Z
Maybe the price of engines will go down? :D As...

Maybe the price of engines will go down? :D

As one who's still building and looking forward to flying, I sure wouldn't mind if our hobby became a little cheaper.

If someone buys an airplane as an...
Forum: Traditional Aircraft Engines 05-20-2022, 06:31 AM
Replies: 19
Views: 1,711
Posted By David Z
Modern automotive oils aren't designed for leaded...

Modern automotive oils aren't designed for leaded fuels, or lead contaminants. Wasn't the case post WW2 when automotive gasoline was leaded. Not suggesting it was okay then, but it's even less okay...
Forum: RV General Discussion/News 05-20-2022, 06:14 AM
Replies: 37
Views: 4,880
Posted By David Z
Yes Please! While the standard tanks are just...

Yes Please! While the standard tanks are just adequate for my planned uses, a little extra will be great for those headwind days. I'm contemplating a small fuselage tank, but this is a much cleaner...
Forum: RV-15 05-17-2022, 10:41 AM
Replies: 51
Views: 18,027
Posted By David Z
I second that! Need some pretty big tires to...

I second that!

Need some pretty big tires to roll over the trees and rocks in the Canadian Shield. Lots of lakes though :D
Forum: Primers 05-12-2022, 08:08 PM
Replies: 13
Views: 964
Posted By David Z
I've done varying treatments throughout the...

I've done varying treatments throughout the plane.

Tail got mating surfaces primed with hardware store rattle can primer.
Wings got zinc chromate over everything with alumiprep/alodine
Fuselage is...
Forum: Traditional Aircraft Engines 05-12-2022, 07:55 PM
Replies: 14
Views: 2,202
Posted By David Z
Turbos also heat the intake air. That's bad for...

Turbos also heat the intake air. That's bad for detonation. What might be okay down low with little/no turbo boost will create a lot of compressive heating of the intake air up high once the turbo...
Forum: RV-8/8A 05-12-2022, 06:49 AM
Replies: 5
Views: 710
Posted By David Z
Alodine is the "proper" way to prep for priming...

Alodine is the "proper" way to prep for priming and paint. Many people skip this step due to it being highly toxic. Myself included.
Forum: RV General Discussion/News 05-12-2022, 06:42 AM
Replies: 35
Views: 2,893
Posted By David Z
Fridge

I'm surprised nobody has mentioned a fridge/freezer. Great for keeping those beers cold for after a good work day. Secondary use is freezing sealants, paint, primer and other things for extending pot...
Forum: RV-15 05-09-2022, 08:53 PM
Replies: 40
Views: 19,713
Posted By David Z
It's a new hemoglobin based primer product. Uses...

It's a new hemoglobin based primer product. Uses iron instead of zinc from the zinc chromate primers of yester-year.

No breathing protection required, but the person applying this primer will still...
Forum: Electrical Systems 05-07-2022, 07:16 PM
Replies: 59
Views: 5,808
Posted By David Z
At the rate I'm building my RV8, perhaps I'll...

At the rate I'm building my RV8, perhaps I'll have primary and secondary electrical generation from Monkworks ;)
Forum: RV General Discussion/News 04-29-2022, 07:19 PM
Replies: 28
Views: 2,374
Posted By David Z
If someone wants to cruise an IO-360 at 110hp and...

If someone wants to cruise an IO-360 at 110hp and 7500', that can be done at full throttle, being 22" and 2400rpm (made up numbers for example sake). Now if ram air can deliver an extra bit of...
Forum: RV General Discussion/News 04-28-2022, 04:42 PM
Replies: 28
Views: 2,374
Posted By David Z
Anything restricting the intake lowers engine...

Anything restricting the intake lowers engine efficiency. This includes a throttle plate, air filter or anything. Unfiltered ram air increases manifold pressure, so to maintain the same total power,...
Forum: RV-15 04-27-2022, 01:38 PM
Replies: 16
Views: 2,749
Posted By David Z
With all the secrecy and hoopla being created...

With all the secrecy and hoopla being created over the RV15, I'm surprised there isn't a poster of a skunk on the wall somewhere. The "Van's Skunkworks".
Forum: RV-10 04-26-2022, 08:15 AM
Replies: 29
Views: 6,358
Posted By David Z
I'm going to disagree. The 200-300hp range is...

I'm going to disagree. The 200-300hp range is very popular outside RVs. The RV10 platform is perfect to experiment within that range. There's lots of talk of ~200hp turbines going on the RV8 because...
Forum: RV-10 04-25-2022, 12:43 PM
Replies: 29
Views: 6,358
Posted By David Z
At one point, Lycoming was the...

At one point, Lycoming was the "alternative".

Rotax was the alternative option that now seems to have done a pretty good job at making the O-200 and O-235 obsolete.

As much as we love our -360 and...
Forum: Safety 04-17-2022, 07:43 AM
Replies: 41
Views: 4,748
Posted By David Z
Never hurts to clarify what was meant. I'd rather...

Never hurts to clarify what was meant. I'd rather have a grumpy controller come back and "yes that's what I said..." than to bust a clearance.
Forum: Traditional Aircraft Engines 04-15-2022, 07:09 AM
Replies: 10
Views: 1,193
Posted By David Z
I flew Navajos for a while. Nothing fancy, old...

I flew Navajos for a while. Nothing fancy, old instruments, but decent airplanes. Turbo angle valve TIO-540 rated at 350hp running ROP at 65% (31", 2200rpm) burned 17gph each. This was about 100°...
Forum: Visual Flight Rules 04-13-2022, 06:27 PM
Replies: 10
Views: 1,302
Posted By David Z
There is a Canadian requirement for redundancy....

There is a Canadian requirement for redundancy. Not that it's applicable to aircraft outside of Canada, but some food for thought.



In practice it means two seperate navigation sources AND two...
Forum: RV Building Tips/Techniques 04-12-2022, 06:56 AM
Replies: 10
Views: 1,243
Posted By David Z
My tanks have been in storage for 10 years and...

My tanks have been in storage for 10 years and counting. I knew it was going to be a long build, so I Alodine'd the tank parts too. I had a friend who worked in large aircraft structures, and he said...
Forum: Reviews 04-09-2022, 08:10 AM
Replies: 3
Views: 700
Posted By David Z
I've used nothing but Lightspeed for a while now....

I've used nothing but Lightspeed for a while now. Customer support has been fantastic. I'm a happy repeat customer.
Forum: RV General Discussion/News 04-05-2022, 07:00 PM
Replies: 25
Views: 2,674
Posted By David Z
There are several neighbours in my area that are...

There are several neighbours in my area that are busy working in their garages. Across the back lane, there's a guy who does a lot of wood working. Those saws are loud! My direct neighbour does some...
Forum: RV Building Tips/Techniques 04-01-2022, 08:30 PM
Replies: 13
Views: 1,345
Posted By David Z
Up-size the drill bits slowly, especially when...

Up-size the drill bits slowly, especially when getting close to final size. I have a good collection of fractional bits, so generally use those, going up small increments at a time. Bit before final...
Forum: Traditional Aircraft Engines 03-25-2022, 05:51 PM
Replies: 109
Views: 7,954
Posted By David Z
But that's the magic question. How much...

But that's the magic question. How much detonation margin is left with 91, 93 or 94 octane fuels on 7.5 pistons? 8.5 pistons? 9.0 pistons? There is a standard detonation test and experience shows it...
Forum: Traditional Aircraft Engines 03-25-2022, 11:03 AM
Replies: 109
Views: 7,954
Posted By David Z
That's how I understood the comment it too. My...

That's how I understood the comment it too. My point remains that we should be careful how much we eat into safety margin. This thread is specifically discussing detonation margin.

What failure rate...
Forum: Traditional Aircraft Engines 03-24-2022, 07:37 PM
Replies: 109
Views: 7,954
Posted By David Z
I took a bird in a cooling air intake. It was a...

I took a bird in a cooling air intake. It was a sparrow, so had no effect on the engine. Also a Piper Navajo, so twice the chance of it happening. Luckily it wasn't the seagull I took in the prop a...
Forum: Painting your RV 03-24-2022, 06:33 PM
Replies: 40
Views: 4,537
Posted By David Z
I set some small parts on a south-facing window...

I set some small parts on a south-facing window ledge. 6 months later, the epoxy primer was a very different shade of green. Since then, I haven't store primed parts on the window ledge anymore.
Forum: Traditional Aircraft Engines 03-24-2022, 06:24 PM
Replies: 109
Views: 7,954
Posted By David Z
Instrumentation won't solve problems that occurs...

Instrumentation won't solve problems that occurs enroute. For example, bird smacks into the cooling air intake and those cylinders shoot up to 500°. It would be nice to be comfortable knowing the...
Forum: RV-14 03-22-2022, 06:43 AM
Replies: 3
Views: 1,124
Posted By David Z
All winter long, I live at -3000 to -6000 feet...

All winter long, I live at -3000 to -6000 feet density altitude and that's on the shore of Lake Superior. Even right now, I'm at -1300. Many cities in the Canadian Praries will be -2000 +/- density...
Forum: Alternative Engines 03-16-2022, 10:52 AM
Replies: 24
Views: 4,764
Posted By David Z
It appears the engine is flat-rated to some...

It appears the engine is flat-rated to some degree. The following quote is from the TurbAero website (linked in post 1).



Granted, nobody is going to cruise around at max take-off power and...
Forum: Alternative Engines 03-12-2022, 07:46 PM
Replies: 24
Views: 4,764
Posted By David Z
What problem do RVs have that a turbine will...

What problem do RVs have that a turbine will solve?

Power? The airframe doesn't need more power, most of them are bumping up against airspeed limits (practically speaking, Vno), so don't need more...
Forum: RV Ongoing Maintenance Issues 03-12-2022, 05:39 PM
Replies: 19
Views: 1,767
Posted By David Z
This begs the question, why is there a hobbs...

This begs the question, why is there a hobbs meter in the plane? I've always worked on "SUDS", that being times for:
Start
Up
Down
Stop

Write it on a scrap piece of paper or wherever. Use that to...
Forum: Canada 03-12-2022, 09:20 AM
Replies: 41
Views: 3,857
Posted By David Z
This is a thread about the Canadian ADS-B...

This is a thread about the Canadian ADS-B mandate, in the Canada regional forum. Yes, the FAA requirements will be different than Canada’s. In this case, appears vastly...
Forum: RV-8/8A 03-12-2022, 08:55 AM
Replies: 3
Views: 845
Posted By David Z
I had the same problem with the F-8108 rails....

I had the same problem with the F-8108 rails. Considered using shims to make up the difference, but decided some forceful persuasion was better. Basically set it up between blocks of wood and beat it...
Forum: COMM 03-07-2022, 08:36 AM
Replies: 41
Views: 3,669
Posted By David Z
Install two COM 1s

I've had several radio failures in airline flying. Coincidentally, they were all COM #2. So by this (twisted) logic, you'll be fine as long as you never have COM #2, then COM #2 won't fail.

VFR,...
Forum: RV Ongoing Maintenance Issues 03-05-2022, 06:40 PM
Replies: 20
Views: 2,569
Posted By David Z
That's been my go-to. Also a great external...

That's been my go-to. Also a great external reminder and prevents the walk across the apron to go check. Can look at the plane from across the apron and see the nav lights are on/off to answer the...
Forum: RV Building Tips/Techniques 03-05-2022, 06:38 PM
Replies: 13
Views: 1,011
Posted By David Z
This has helped me a lot too. Looking at others'...

This has helped me a lot too. Looking at others' builder's logs helps put everything together in my head. I'll read the next section, gain an understanding of what's going to happen, research VAF and...
Forum: RV General Discussion/News 03-04-2022, 08:22 PM
Replies: 25
Views: 2,366
Posted By David Z
Didn't mean to be insulting, I apologize. Just...

Didn't mean to be insulting, I apologize. Just that a small single engine piston aircraft is a bit different than a fly-by-wire jet fighter. Maybe not quite apples to oranges, but maybe Golden...
Forum: RV General Discussion/News 03-03-2022, 08:19 PM
Replies: 25
Views: 2,366
Posted By David Z
Sounds like people are looking for a "maximum...

Sounds like people are looking for a "maximum fuselage weight", or more commonly known as a Zero Fuel Weight. So what's a reasonable ZFW to assume for an RV? I'm going to use the 7/8 weights because...
Forum: RV General Discussion/News 03-03-2022, 07:25 PM
Replies: 54
Views: 8,163
Posted By David Z
That's my concern too. Hoping UL Power continues...

That's my concern too. Hoping UL Power continues to become a more viable with FWF kits and will start putting significant cost pressure on Lycoming. 40 grand for 180hp is absurd.
Forum: Electrical Systems 03-02-2022, 06:09 AM
Replies: 6
Views: 763
Posted By David Z
That's great to hear. Thanks for posting the...

That's great to hear. Thanks for posting the conclusion too. Good to hear about good customer service.
Forum: Alternative Engines 02-23-2022, 08:32 PM
Replies: 74
Views: 8,647
Posted By David Z
The UL Power 520 series looks reasonable for RV...

The UL Power 520 series looks reasonable for RV 4, 6, 7, 8. Haven't seen much happen. Not sure why either.
Forum: Canada 02-22-2022, 08:24 PM
Replies: 41
Views: 3,857
Posted By David Z
I put the query into Dynon and haven't heard back...

I put the query into Dynon and haven't heard back yet. Anybody know if they are developing anything to meet this requirement?
Forum: RV Building Tips/Techniques 02-22-2022, 08:12 PM
Replies: 25
Views: 1,923
Posted By David Z
Apparently PEX and other plastic pipes can bust...

Apparently PEX and other plastic pipes can bust violently and send shards of plastic flying at everyone nearby. Metal pipes burst in a much safer fashion.Just a split and no shrapnel flying...
Forum: RV General Discussion/News 02-22-2022, 08:02 PM
Replies: 26
Views: 2,432
Posted By David Z
It's not just fancy letters on a license or...

It's not just fancy letters on a license or ratings on a resume. It's fantastic training and experience. The one day when something goes horribly wrong, the real plane will feel just like the sim....
Forum: RV Building Tips/Techniques 02-21-2022, 07:19 PM
Replies: 20
Views: 2,646
Posted By David Z
It's frustrating for me too, because I was...

It's frustrating for me too, because I was innocently taught the incorrect method when I first started building. End result is I'm out $3300 for new wing spars. I'm learning this lesson the...
Forum: RV Building Tips/Techniques 02-18-2022, 09:02 PM
Replies: 20
Views: 2,646
Posted By David Z
The countersink has a sharp edge, it goes from...

The countersink has a sharp edge, it goes from the 100* angle to flat with the sheet top. The dimple has slightly rounded edges. The dimpled top sheet will never sit flush until countersunk sheet is...
Forum: Canada 02-16-2022, 07:19 PM
Replies: 41
Views: 3,857
Posted By David Z
Short answer: No. Long answer: Sort-of....

Short answer: No.

Long answer: Sort-of. NavCanada decides on airspace classification, meaning they can decide if airspace is controlled or uncontrolled, transponder airspace or otherwise. NavCanada...
Forum: RV General Discussion/News 02-15-2022, 05:47 AM
Replies: 11
Views: 1,252
Posted By David Z
Sounds like that's a definition of fabricating an...

Sounds like that's a definition of fabricating an airplane. This thread is about fabricating parts. Former being a legal term, and latter being a fun discussion.
Forum: RV General Discussion/News 02-15-2022, 05:45 AM
Replies: 23
Views: 1,662
Posted By David Z
My concrete floor is horrible. Hasn't seemed to...

My concrete floor is horrible. Hasn't seemed to slow me down yet.
Forum: Canada 02-14-2022, 05:29 PM
Replies: 41
Views: 3,857
Posted By David Z
ADS-B Again

Looks like NavCanada is at this again:
https://www.navcanada.ca/en/air-traffic/space-based-ads-b/ads-b-performance-requirements.aspx

About a year to equip if you want to fly in class A or B...
Forum: Alternative Engines 02-14-2022, 05:19 PM
Replies: 74
Views: 8,647
Posted By David Z
Standardized interchange battery packs. Land,...

Standardized interchange battery packs. Land, taxi up to the FBO. They come over with a new battery on a cart, swap it sitting right there, spin up some electrons and go flying again.

We'd need some...
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