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Old 05-30-2016, 11:07 PM
rvbuilder2002 rvbuilder2002 is offline
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 7,327

Originally Posted by RFSchaller View Post

I'm not sure Iget what you're point is with regard to spring orientation. Is there something critical I'm missing?

Yes, but only relevant if you are using McFarlane springs.
Any opinions expressed in this message are my own and not necessarily those of my employer.

Scott McDaniels
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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Old 05-31-2016, 08:12 AM
Ex Bonanza Bucko Ex Bonanza Bucko is offline
Join Date: Jul 2013
Location: San Diego, California
Posts: 291

The McFarlane springs come with an instruction....and a picture I think...that requires they be installed with the open end IN at both top and bottom. But I am not at the airplane now so I may be mistaken about the just look at the picture or read the McFarlane instructions.

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Old 05-31-2016, 11:08 AM
RFSchaller RFSchaller is offline
Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 2,174

Thanks for the explanation.
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Old 06-02-2016, 06:59 AM
Handclutch Handclutch is offline
Join Date: Feb 2015
Location: Bendigo, Australia
Posts: 55
Default Old springs with vernier assist throttle

Here's something interesting. Had a flight I needed to do after spring broke. Remembered I still had the old springs from original throttle. Wondered how they might work with new vernier assist throttle. Installed them and did a ground run - worked fine. No creeping or need to constantly tighten friction nut. Went flying and very happy with result. I did tighten the friction nut a whisker but not sure it was necessary. Operation was virtually identical to that with new McFarlane springs. Easy to use and stayed exactly where it was set. I plan to leave old springs in place. They are robust and unlikely to break and I still have the advantages of ther new throttle.

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Old 06-25-2016, 02:29 PM
PilotBrent PilotBrent is offline
Join Date: Dec 2011
Location: Hackettstown, NJ
Posts: 419

Originally Posted by PilotBrent View Post
Per Scott's note on this thread, I'll be putting in a report to Van's on this but thought I'd mention it here.

Installed Vernier Assist Throttle Control 3/2015 obtained from Van's with the new springs provided. At 107 hours, the right spring failed (noticed it after flying for several hours just before last flight of the day during a quick peak in oil door). Don't specifically remember looking at it at beginning of the day but I generally take a good look through door before the first flight of the day and obviously didn't notice anything. Throttle moves back and forth just fine without it so I wasn't even noticing an issue flying. If it had failed on left side, I might not have detected it until next oil change. Left side spring looks fine BTW.

Appears to be a relatively clean break just at the bottom of the coils. I'll hang onto it in case Van's wants to inspect it themselves.
Discovered that the left throttle spring has now failed as well. That is both R & L failing in about 100 TACH hours of use. Posted a followup report to Van's engineering

Brent Connelly
Hackettstown, NJ
RV-12, N913BC
Hobbs over 400 hours and on second set of main tires!

Check out & subscribe to my Youtube channel for latest RV-12 flying videos...
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Old 06-25-2016, 10:52 PM
RFSchaller RFSchaller is offline
Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 2,174

Still loving my Home Depot springs after about three years and more than 300 hours on them!
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Old 06-25-2016, 11:40 PM
Sink Sink is offline
Join Date: Apr 2015
Location: Altha, FL.
Posts: 114

Springs typically break from excessive vibration and or the spring metal hardness is too hard which makes them brittle or they are being over extended. If McFarland springs show a break pattern then a call to them from everyone would be warranted to let them know. It can't get fixed if no one knows. The Rotax springs can break, but isn't common. Maybe McFarland needs a different alloy metal spring.
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Old 06-26-2016, 05:23 AM
Mich48041 Mich48041 is offline
Join Date: Apr 2008
Location: Riley TWP MI
Posts: 2,550

With all of that tension on them, no wonder they break. I love my modified (shortened) Century Spring part number 5553, no throttle creep.
Joe Gores
RV-12 Flying
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Old 02-21-2017, 07:08 PM
rjtjrt rjtjrt is offline
Join Date: Mar 2006
Location: Australia
Posts: 701

Just had annual on RV-12
Total 101.5.
Left spring broken.
Replaced with McFarlane 6822 springs, as only ones we had available here.

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