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10-07-2006, 03:19 PM
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Join Date: Dec 2005
Location: Hamilton, New Zealand
Posts: 632
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Pushrods in fuse kit...
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Originally Posted by IowaRV9Dreamer
On my drawing 33, view C-C. The drawing is for both RV-7 and RV-9. and the rod part # seems to be the only difference:
RV-7: F-759A (round)
RV-9: VA-256 (hex)
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Ahh. I don't have the fuse kit yet; another thing to check when I order. Thanks.
Last edited by AntiGravity : 10-07-2006 at 03:41 PM.
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10-07-2006, 05:44 PM
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Join Date: Jan 2005
Location: Marion IA
Posts: 1,095
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Quote:
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Originally Posted by Mel
The flaps on the -7 are "plane" flaps. On the -9, they are "slotted" flaps, so the pushrods are different.
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Thanks Mel - I forgot about the difference in flap type. It's interesting that even with different flap types, the drawing calls out the same lengths, rod ends, etc. The only difference is the tube (round or hex). Is the hex tube stronger, and if so is that needed by the slotted flaps?
__________________
Dave Gribble VAF #232
Building RV-9A N149DG (slider, IO-320, IFR)
Restored and Flying Beech Super III N3698Q
Marion IA
Struggling with fiberglass
There is no sport equal to that which aviators enjoy while being carried through the air on great white wings." Wilbur Wright, 1905
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10-07-2006, 07:16 PM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,768
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I'm not an aeronautical engineer (don't even play one on TV), but I would guess that the slotted flaps carry less loads. Of course the way they are attached also makes a difference. The "plane" flaps have a continuous hinge, whereas the slotted flaps have individual hinges. You professional types out there feel free to chime in.
__________________
Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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10-07-2006, 10:06 PM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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Get your facts straight...
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Originally Posted by RV_7A
Just so everyone knows. Vans sells the hexagonal rods already drilled and tapped for use with the flaps. Its just another part that they are to "fat, dumb and happy" to upgrade in the kit for everyone. Just pick up the phone and order. Problem solved.
-Jeff
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I may be wrong but if my memory is correct, the hex rods are specifically designated as the part to use on an RV-9 or 9A. It has much larger flaps than the other models with an expectedly higher load on the rod.
That is the reason they are available... not because they should be used on the other models.
__________________
Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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10-08-2006, 09:41 AM
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Join Date: Jan 2005
Location: San Antonio, TX
Posts: 1,024
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I don't know about everyone else, but I have bought two VAN's kits to build so that I wouldn't have to engineer or re-engineer anything on a proven design.
So far, all of the pieces that VAN's has provided have been adequate, if his directions and plans are followed correctly, at least for me. (Sure, I have redone some pieces that I didn't get put together to my own standards, but that wasn't VAN's fault.)
I don't know how some of you guys ever get a plane finished.
__________________
Steve Formhals
A&P, Tech Counselor & Flight Advisor
RV3B
RV8
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10-08-2006, 12:33 PM
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Join Date: Dec 2005
Posts: 976
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Flap Rod - Danger or Not? Well, as Van's say (certainly for the 8) a Flap Rod failure is containable with aileron... so it would seem not a "Danger" even if it does fail?
As alluded to earlier, the Flap Rod attachments can be a problem. I had to make a "Left" and "Right" spanner to get the nuts tight - and another 8 builder I spoke had done the same...
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10-08-2006, 02:38 PM
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Join Date: Jan 2005
Location: St. Paul, MN.
Posts: 4,792
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Quote:
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Originally Posted by sf3543
I don't know how some of you guys ever get a plane finished.
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Hey, no fair. I didn't know we were racing! 
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10-08-2006, 10:16 PM
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Join Date: Jan 2005
Location: Chandler, AZ
Posts: 2,904
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Flap rods
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Originally Posted by Jonathan Cude
So I built the Flap Pushrods for my RV-7A. I have to say I thought they looked really small. I have heard buzz of these suckers failing and thought maybe I would look into it instead of paying attention in class... here's what I got.
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Jonathan,
If you attempt to re-engineer the plane, you'll never get it done. The Van's people have already done that work.
The stock rod is fine if drilled properly and the flap extension speeds are followed. Also make sure the hole in the fuselage allows at minimum a 1/16" clearance in the full range of travel. Build on and don't over analyze everything.
I see you'll have soon have your degree, congrats. Keep in mind that thermometers have degrees and you know where they stick them sometimes.
__________________
Darwin N. Barrie
Chandler AZ
www.JDair.com
RV-7 N717EE-Flying (Sold)
RV-7 N717AZ Flying, in paint
EMS Bell 407,
Eurocopter 350 A-Star Driver
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10-08-2006, 11:29 PM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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Back to skool
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Originally Posted by cytoxin
they used to do this at sears,,,scare the cutomer to death then offer up a solution that will make it all better. just offer the parts for sale on the basis of their strengths. i charge 70 bucks an hour for a trans overhaul i know the time is worth it. so 3 rods out of 9000(4500) failed wow thats like .001% most would argue those are acceptable margins
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Maybe... but back to skool for you.....
3 in 9000 is 1 in 3000 -- which is actually 0.033% per rod...
But it's 0.066% per RV
Your estimate is 33 (or 66) times off...  ....not even close enough for government work....
gil in Tucson
__________________
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
Last edited by az_gila : 10-08-2006 at 11:33 PM.
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10-09-2006, 07:01 AM
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Join Date: Apr 2006
Location: south carolina
Posts: 1,111
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Quote:
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Originally Posted by az_gila
Maybe... but back to skool for you.....
3 in 9000 is 1 in 3000 -- which is actually 0.033% per rod...
But it's 0.066% per RV
Your estimate is 33 (or 66) times off...  ....not even close enough for government work....
gil in Tucson
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4500 planes= 9000 rods- 3 rods failed, i dont think there is a trend. i think three builders made a faulty piece or simply overlaoded them
guess i should watch the quick math  either way its still negligible 
__________________
William Weesner/ still kicking.
Last edited by cytoxin : 10-09-2006 at 07:10 AM.
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