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11-23-2011, 01:05 AM
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Join Date: Jun 2008
Location: Byron Bay, NSW
Posts: 104
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Message to Vans engineering re creeping throttle
My report is sent. I looked up the date of the PWR plant packing list for my kit and included that.
Rod
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11-27-2011, 12:22 PM
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Join Date: Jan 2005
Location: Kentucky Lakes area in KY
Posts: 947
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Throttle Spring Orders
I need shipping addresses for the following orders:
Only one name left, Come on Mark!! Give it up.
Mark Henderson
Thanks. Send to: tomscub@earthlink.net
__________________
2013- RV12, Kit #119. N123M First flight Nov21. It's a keeper!
1998- RV-9 tail kit, built and sold
1989- RV-6 tail kit, built and sold
Last edited by todehnal : 11-30-2011 at 05:11 AM.
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11-28-2011, 04:41 PM
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Join Date: Jan 2006
Posts: 905
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I checked this thread as I was curious. I will recheck what I am doing with the throttle on next flight, but I don't recall a problem with it. I of course release the lock on takeoff and then lock it in wide open position (likely unecessary to do that part, but it's a throwback to other airplanes throttles). On leveling off I reset to 5400 and lock it again. Don't think I have a creep issue. Only time I get rpm up/dn is when I change pitch. In pattern I lock it at 4000 or so and there is no creep. On approach I hold the throttle with the lock released so I can make any small adjustments required. The spring tension in that case is noticeable, but not a problem. I, like others may have just gotten used to it. I suppose it's possible also that later kits sold had a different spring/throttle set up, but I am number 120093 which is not far down the line from start.
Dick Seiders
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11-29-2011, 12:38 PM
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Join Date: Jun 2007
Location: Perth, Scotland
Posts: 494
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Another data point
I bought my (standard) engine from a UK Rotax agent, but assume the springs are the same as everyone else's. The throttle assembly came from Vans.
If I tighten the throttle lock as much as I can, the throttle won't creep above 4700 rpm. Anthing below that and the friction cannot overcome the springs.
Cheers...Keith
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11-29-2011, 12:47 PM
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Join Date: Nov 2007
Location: Jesup, Iowa
Posts: 1,658
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I'll jump in too - -
Since I flew yesterday, I can say the early throttles must be different. I have never had a problem locking the throttle in ANY position. I don't have to lock it hard either. ( original springs ). Must be something with the later versions.
John Bender
332.6 hours
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11-29-2011, 01:03 PM
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Join Date: Oct 2011
Location: Manchester, UK
Posts: 9
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Message to Vans engineering re creeping throttle
Our aircraft has the same problem, throttle won't hold using friction lock. Report has been sent to Engineering.
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11-29-2011, 01:08 PM
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Join Date: Apr 2008
Location: Riley TWP MI
Posts: 3,070
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While everyone else is watching the pretty scenery in the video of the RV-12 flying around Mt. Baker, I was watching the pilot's hand and the throttle. It seemed like he adjusted the throttle 4 or 5 times. He might have been making adjustments to climb or descend. Or the friction lock might not have been holding. Now I will have to watch that video again to see the pretty mountains that I missed. 
Joe Gores
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11-29-2011, 02:19 PM
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Join Date: Feb 2005
Location: Marysville, WA
Posts: 521
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Adjustment, not creep
I was making power adjustments in the video. At first I was approaching too fast so I wanted to slow down. Then I wanted to go a little upper so I added a little power.
S/N 18 and I only have creep issues (though I've been called a creep on plenty of occasions) at idle. At cruise there're no issues. On a long cross country I set the power and don't touch it until it's time to come down.
I will admit that I do have to hold it out on short final as it will try to increase 100 RPM or so at idle, but for ground handling or anywhere else, I have no problem with it. Yes, I do have the friction lock as tight as it will go, but I find in that configuration, with my cable at least, I get the best of both worlds. It only moves when I want it to, but I can move it without much effort.
This is just the opposite of my 150 which would have the throttle slowly close from full if I didn't keep my hand on it in a climb.
While it is obvious that there are people who have an issue in this area, I am not one of them.
I did at one time entertain the idea of redesigning the whole throttle mechanism using push/pull rods, more like a conventional throttle cable, with a "mixer" at the firewall to control both carburetors exactly the same amount, but decided that I would rather just fly it.
__________________
Steve Rush
Arlington, WA
ArlingtonRV on YouTube
RV-8 (Bought Flying)
Glasair Sportsman (Sold)
RV-8 Tail, QB Fuselage (Sold)
RV-4 (Bought Flying) (Sold)
RV-9 Tail
RV-12 120018 Flying (Sold)
RV-7 Tail, Wings, Started Fuse (Sold)
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11-29-2011, 02:27 PM
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Join Date: Nov 2007
Location: Jesup, Iowa
Posts: 1,658
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Another thought - -
I have never tried to adjust the throttle with it 'locked'. I ALWAYS unlock it to move it even slightly. Not sure if that can change things or not, but that's what I do. On takeoff, I just more or less let it go, and do not lock it until I am ready to level off and set it where I want it.
John Bender
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11-29-2011, 02:35 PM
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Join Date: Apr 2008
Location: Riley TWP MI
Posts: 3,070
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Steve,
It is good to hear that your throttle works OK. Since I am the one who suggested weaker throttle springs for those throttles that creep, I take an interest in how the throttle works in other RV-12s. I really enjoyed the beautiful scenery in your video and want to fly out west sometime.
Joe Gores
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