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Advertise on VAF.

@VansAirForceNet

November 17, 2017.   Issue No. 4,440.
  Wishing you and yours a happy, safe and RV-filled weekend.
 

Gear Shimmy Video ...13brv3

I'm familiar with the shimmy causes and fixes, so this is mainly being posted for your entertainment. Don't say I never gave you anything :-)

And a GREAT Landing Video ...same guy

 

Vinyl Wrap Weight ...Bevan

I weighed a square foot of vinyl (3m-1080) and multiplied that by my calculated surface area of the entire airframe. The calculated result was 17lb. I rounded that up to 20 to account for some overlap and estimating errors.

A local pro aircraft painter and I had a "why vinyl" versus paint discussion and weight came up. He confessed that an RV he recently painted in three colours base/clear system probably left 55lb of material on the airplane.

Even if his estimate was high by double, the vinyl is still lighter.

BTW, I ended up painting most of the fibreglass parts to color match the vinyl including engine cowl, spinner, wheel pants and wing tips.

 

Breaking the Mishap Chain: Human Factors Lessons Learned from Aerospace Accidents and Incidents in Research, Flight Test, and Development

...free e-book from NASA (updated August 2017).  This volume contains a collection of case studies of mishaps involving experimental aircraft, aerospace vehicles, and spacecraft in which human factors played a significant role. In all cases the engineers involved, the leaders and managers, and the operators (i.e., pilots and astronauts) were supremely qualified and by all accounts superior performers. Such accidents and incidents rarely resulted from a single cause but were the outcome of a chain of events in which altering at least one element might have prevented disaster. As such, this work is most certainly not an anthology of blame. It is offered as a learning tool so that future organizations, programs, and projects may not be destined to repeat the mistakes of the past. These lessons were learned at high material and personal costs and should not be lost to the pages of history.

 

Status Report ...David Paule RV-3B

Before I could rivet the long belly skin, the side skins need to go on. The bottom of the belly skin was already riveted to the various stiffeners and bulkhead flanges, so the only remaining parts were at the ends and the bulkhead shoulders, and they can wait till I do the lower longeron and bulkhead riveting for the side skins.

The tape bumps roughly in the middle are folded-over tape, giving me aen easy place to grab on to for removing the tape. I now like 3M's model 33 electrical tape. I've tried blue painter's tape, which is harder to remove, and green painter's tape, which is fine if there's a wider area to tape but is slightly harder to remove. However the green painter's tape conforms down into the dimples better.

One of the steps to this gluing is to mask off the areas adjacent to where the glue goes and then do a dry fit check to verify that the tape is in the right place. At the upper left, you can see that I needed to adjust this a bit. The tape is slightly apart from the joint so that I can form the glue squeeze-out into a fillet there.

 

Refurb Status ...BruceMe

The canopy on there now is 100% sikaflex built ~2006 (about 2 yrs before first flight). I honestly did a messy job. Others have posted better work. My canopy has never cracked or de-bonded to the frame despite really awful abuse. The "non-critical" skirt which I sikaflex'd as well, has de-bonded when the canopy slammed open rev'g to taxiing in wet muddy grass. I will rivet the skirt to the frame as well as sika. I will also repeat the Sika with this canopy re-cut project as I do really like it. I'll likely have to carefully die-grind (scotchbright wheel) off the old Sika in some spots, but I'm mostly cutting down the existing glass.

This is what I plan to do to the canopy...

 

Argument FOR filling empty hole with rivet ...Tdeman

Without knowing the exact circumstance (regarding where the hole is etc), the one question that can be addressed is:

"So, will driving a rivet do anything to restore part of the lost strength in this longeron?"

We'll see the greatest effect of this rivet itself in compression, where it will in fact carry some compressive loads.
That being said, there is still a benefit of having the rivet in the hole while the longeron is in tension, as pointed out in the article shared above by Kurt W (as well as other texts on mechanical behavior of materials...)

In case anybody didn't read the whole thing , one part that stood out is...

"Both cold working and interference fit fasteners set up residual compressive stress fields in the metal immediately adjacent to the hole (Fig. 14.26). The applied tension stress during fatigue loading must then overcome the residual compressive stress field before the hole becomes loaded in tension. The fatigue improvement due to cold working in 024-T851 aluminum is shown in Fig. 14.27"  ...

 

Rear Seat Heat ...DonPro

In my 6, my wife often wears a jacket and wants the heat full on and I am down to a T-shirt and still warm so I knew the 8A would need rear heat. Learning from the 6 I have aileron and elevator push tube boots to seal the tunnel. I had Larry Vetterman make both of my heat muffs and control boxes with 1.5" outlets which works great and he did for no extra charge but 2" will work too. The key part is made on a piece of 1/2 X 3" pine that is actually 1/2 X 2 1/2" from Lowes which I routed two corners off of. I rapped it with packing tape and put PVA release agent on it but it was still a bear to get the wood out when done. I had to drill it some. The inlet is leftover 1.5 push tube from the kit. At full deflection there is still 1/8" clearance and a plethora of hot air is coming up between the backseater's legs. Full disclosure, I am preheating my heat muff air with the oil cooler to save on cooling losses in the summer but you may not have to. My heat is very hot though!  more pics

 

RV-14A Build Site ...Bob Meyers

Here's a link to mine, first flight was in late June. Made it to Oshkosh and now have just over 100 hours.

 

To all RV-3, RV-4 and RV-6 builders: (Mothership)

"Van’s Aircraft has always prided itself on customer support. One aspect of this support is our commitment to continue the ready supply of parts for older models that have been superseded in design and ease of assembly. The RV-3, RV-4 and RV-6 were the basis of our product line for quite some time. In recent years we have seen their respective kit sales decline significantly. Although kits and spare parts for these models remain in our inventory, the cost to produce and warehouse parts that rarely sell is ever more burdensome. Therefore, to mitigate the costs and logistical difficulties that arise from low sales, we must adjust our production, pricing and delivery schedules.

This is to inform builders of these models that prices for these kits will significantly increase after January 1, 2018. Production runs for these kits will not cease, but the period between them will increase dramatically. We estimate production gaps of one year or more that can easily translate to delivery dates of one to two years from date of order.

We at Van’s want you to continue your project to completion and therefore suggest that you place an order for an empennage, wing, fuselage or finish kit now at current prices. If we receive enough orders for these kits beyond current inventory by years end, we will institute a production run to cover them all. This will yield reasonable delivery times. Spare parts will also remain available as supplies last. However, once depleted, parts may still remain available, but will be produced on a one-off basis. Production of any one part is expensive so an elevated price compared to a similar part in another model RV is to be expected.

Kits available for order are:
RV-3 Empennage, Wing, Fuselage and Finish
RV-4 Empennage, Wing, Fuselage and Finish
RV-6(A) Fuselage and Finish

Current prices will remain in effect for all kits ordered prior to December 31, 2017. Subsequent orders will be subject to the increased prices.

Van’s Aircraft"

(From Mitch Lock)
"This new policy is not to be misconstrued as a faltering in our commitment or willingness to support our customers whether an order was placed yesterday or forty-six years ago. We will produce a singular part if need be to make certain the reason an RV doesn’t fly is not due to us. But the economic reality to perpetuate this level of dedication compels us to make hard choices. Any model we produce must generate enough revenue to at least keep it from being subsidized. This was our only path to keep these models viable, old ones flying and hopefully new ones to finally take to the air."
__________________
Mitchell Lock
President Van's Aircraft

 

Update from the Mothership ...RE: Hobbs Meter (20 to go)

 

 How to Minimize the Chance You Could be Dealing with a Scammer

...when using the classifieds.


Model-specific subforums

14
/14A
photo courtesy Van's Aircraft, Inc.
12

10

9/9A

8/8A

7/7A

6/6A

4
photo courtesy Fred Bauer, Jr.
3

VAF Calendar ...upcoming Events for the Next 60 Day(s)

11-24-2017: KJKA - LULU's Fly-out


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