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Throttle springs

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Jim Feldmann

Joined: 01 Sep 2008
Posts: 54
Location: Burbank, CA

Posted: Wed Oct 08, 2008 9:25 am Post subject: Throttle springs

Hi:



I'm new here, having just purchased a Kitfox IV Speedster with a Rotax 912UL.  



The throttle springs are set to open the throttle in the event of a linkage failure.  OK, but the springs are so strong that they pull the cable right past the ratchet in a vernier throttle.  I'm using a collet type throttle, but as soon as I loosen the collet, the springs try to pull the throttle out of my hand.



Is there a lighter spring available?  What have you done and where did you get the springs?



Jim Feldmann

Kitfox IV Speedster

912UL  N629JB

cliffh(at)outdrs.net
Guest

Posted: Wed Oct 08, 2008 10:36 am Post subject: Throttle springs

I bought lighter springs from the local Ace Hardware store.



Floran Higgins

Helena, Mt

Speedster

912 ULS

---

lcfitt(at)sbcglobal.net
Guest

Posted: Wed Oct 08, 2008 10:49 am Post subject: Throttle springs

Jim,



The way I did mine in order not to overide the safety issue, is to put a 

counter acting spring between the bellcrand behind the panel and the panel. 

I experimented with springs until I found one that almost perfectly matched 

the throttle springs.  Others have used softer springs on the carbs.  I 

think most were hardware store variety springs.



Lowell



---

brianm(at)snolab.ca
Guest

Posted: Wed Oct 08, 2008 11:41 am Post subject: Throttle springs

Hi

I added a spring the same way as Lowell and it is working fine. When the

throttle lock is depressed there is a very slight opening of the throttle

but nothing like before.

Purchased the spring at a local hardware store

Brian



--

Jim Feldmann

Joined: 01 Sep 2008
Posts: 54
Location: Burbank, CA

Posted: Wed Oct 08, 2008 2:31 pm Post subject: Re: Throttle springs

Just got back from the hanger and I took a picture of the linkage I am talking about.  It seems like that is an awful lot of spring just to open the throttle in case of a linkage failure.  Not sure I would like to see what happens if the linkage only fails on one side either.



The main problems though are the difficulty in holding a specific throttle setting during approach, and the fact that the throttle creeps open during cruise.



Jim

thesupe(at)hotmail.com
Guest

Posted: Wed Oct 08, 2008 3:57 pm Post subject: Throttle springs

Sorry to be picky C but it looks like the choke cable could use some attention also.  Jim Chuk   Kitfox 4 building  Avid MK IV flying Mn

 	  Quote: 	
		   Subject: Re: Throttle springs

 From: feldesign(at)earthlink.net

 Date: Wed C 8 Oct 2008 15:31:09 -0700

 To: kitfox-list(at)matronics.com

 --> Kitfox-List message posted by: "Jim Feldmann" <feldesign(at)earthlink.net>

 Just got back from the hanger and I took a picture of the linkage I am talking about. It seems like that is an awful lot of spring just to open the throttle in case of a linkage failure. Not sure I would like to see what happens if the linkage only fails on one side either.

 The main problems though are the difficulty in holding a specific throttle setting during approach C and the fact that the throttle creeps open during cruise.

 Jim

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Jim Feldmann

Joined: 01 Sep 2008
Posts: 54
Location: Burbank, CA

Posted: Wed Oct 08, 2008 4:47 pm Post subject: Re: Throttle springs

No, no...  picky is good.    



What did you see about the choke linkage that bothers you?



Jim

Lynn Matteson

Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

Posted: Wed Oct 08, 2008 4:56 pm Post subject: Throttle springs

Oops.....another reason that one carb is maybe a better way to go in  

engines. I hadn't thought about you guys with the two carbs, and a  

runaway bank of cylinders. That sure changes the "get her home"  

tactic of controlling rpm with the key switch. Does anybody out there  

run  Aerocarbs on Rotax's? That has no bearing on the topic, but I'm  

curious.



Lynn Matteson

Kitfox IV Speedster

Jabiru 2200, 562 hrs, temporarily grounded as one-half of ignition  

system is in for a "medical checkup"



On Oct 8, 2008, at 6:31 PM, Jim Feldmann wrote:

 	  Quote: 	
		   Not sure I would like to see what happens if the linkage only fails  

 on one side either.



 The main problems though are the difficulty in holding a specific  

 throttle setting during approach, and the fact that the throttle  

 creeps open during cruise.



 Jim

_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM

thesupe(at)hotmail.com
Guest

Posted: Wed Oct 08, 2008 6:49 pm Post subject: Throttle springs

Looked to me like some of the strands on the choke cable were broke off where the screw holds the cabel to the choke lever.   Take care C  Jim Chuk  Kitfox 4 building  Mn> Subject: Re: Throttle springs> From: feldesign(at)earthlink.net> Date: Wed C 8 Oct 2008 17:47:21 -0700> To: kitfox-list(at)matronics.com> > 

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Jim Feldmann

Joined: 01 Sep 2008
Posts: 54
Location: Burbank, CA

Posted: Thu Oct 09, 2008 7:50 am Post subject: Re: Throttle springs

Thanks Jim, I will check all cables for broken strands.



Jim

Jim Feldmann

Joined: 01 Sep 2008
Posts: 54
Location: Burbank, CA

Posted: Wed Oct 15, 2008 2:31 pm Post subject: Re: Throttle springs

I bought the correct springs from Rotax and installed them.  Problem solved.  



Thanks to all for your input.



Jim

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