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  #61  
Old 12-01-2011, 02:21 PM
rgmwa rgmwa is offline
 
Join Date: Feb 2010
Location: Perth, Western Australia
Posts: 1,647
Default

Quote:
Originally Posted by KRAUSEGB View Post
FYI

I contacted McFarlane Aviation, which supplies the throttle control and this was their reply:

" The throttle springs that come from Rotax are two strong of a pull to be used with a friction lock control. They are more suited to a non locking throttle control. I will send you two new throttle springs to install. This should take care of the throttle creeping problem you are having. I will also send you a throttle control friction lock service kit. Just in case you are still having trouble after you install the new springs. "

Gary
It would be a good idea to let Vans know.
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  #62  
Old 12-01-2011, 05:33 PM
Ausflyer Ausflyer is offline
 
Join Date: Jun 2008
Location: Byron Bay, NSW
Posts: 104
Default Its logical when I think about it

Who should be the engineer to guarantee the safe operation of the throttle mechanism, in good times and bad? Rotax? Vans? the throttle manufacturer?
Gary, thanks for doing that. It will be good to get this sorted for all those RV-12s with crook throttles. And to have an engineer behind the necessary mods.
Rod
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  #63  
Old 12-01-2011, 08:15 PM
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Jetguy Jetguy is offline
 
Join Date: Aug 2008
Location: Texas, Fort Worth
Posts: 1,237
Default Those trouble some springs!

Really if there is a issue with the throttle on the 12 then if enough people report it to Vans then they should come up with a fix for every one.
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  #64  
Old 12-02-2011, 11:44 AM
BigJohn BigJohn is offline
 
Join Date: Nov 2008
Location: Gloversville, NY
Posts: 1,587
Default Yay! A real fix!

Just called McFarlane. Talked to Starr. She is on top of the situation and told me their engineers have been working with Van's folks on this issue. I ordered two replacement springs for about 8 bucks apiece. Starr said they will be shipped out on Monday.

Since I never got around to installing the springs I got from Joe, I will hold those in reserve and try out these semi-official replacements and report back.

Apparently there has been action going on in the background that we did not know about. Thank you Gary for contacting McFarlane and getting the word out on this. It could be a while before we get this through "official" channels.
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  #65  
Old 12-07-2011, 02:16 PM
Lapsley Lapsley is offline
 
Join Date: Jun 2010
Location: Okeechobee, FL
Posts: 14
Default Throttle springs

Although I could personally live with the creepy springs, my wife cannot. she is very slight and when the throttle lock is tight enough to defeat the creep, she does not have enough strength in her wrist to unscrew the throttle lock. Consequently she has to fly with her hand always on the loose throttle to prevent creep. Hard to put the flaps down that way.
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  #66  
Old 12-08-2011, 07:25 AM
BigJohn BigJohn is offline
 
Join Date: Nov 2008
Location: Gloversville, NY
Posts: 1,587
Default New springs are here!

I just opened yesterday's mail and I now have a set of the new springs, Part No. 6536, from McFarlane. They also sent along a big thick catalog of all their aviation goodies that might come in handy in the future.

As soon as we get a decent day here I will install and test fly. WX here today is 20's and snowing.
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RV-12 N37JP 120176 Flying since 2012.
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VAF paid through 10/2019.

Last edited by BigJohn : 12-11-2011 at 08:28 PM. Reason: Part Number is 6534, not 6536 - my typo...
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  #67  
Old 12-08-2011, 07:53 AM
AlanTN AlanTN is offline
 
Join Date: Apr 2011
Location: Linden, TN
Posts: 79
Default Spring strength?

John, I think it would be interesting to know how strong these new springs are compared with the originals and the ones Joe has ordered.

"I spent lots of time reading spring catalogs to find the one that I wanted: 4 pounds of tension compared to 8 pounds for the original springs." Joe Gores
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  #68  
Old 12-08-2011, 08:31 AM
Mich48041 Mich48041 is offline
 
Join Date: Apr 2008
Location: Riley TWP MI
Posts: 3,070
Default Measuring spring strength

An easy way to compare the strength of two springs is to hook them together and pull. The weakest spring will expand first. Another way is to use a fish scale to measure the strength of each spring.
Joe Gores
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  #69  
Old 12-08-2011, 01:55 PM
Lapsley Lapsley is offline
 
Join Date: Jun 2010
Location: Okeechobee, FL
Posts: 14
Default Mcfarland Part Number

I tried the 6536 part number for the Mcfarland spring. Not successful. Can anyone verify the part number
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  #70  
Old 12-08-2011, 04:39 PM
AlanTN AlanTN is offline
 
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Location: Linden, TN
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Default

Joe, how much elongation did you use to measure the force in your springs? Someone else would need to know this detail, I suspect.
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