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Jim Feldmann
Joined: 01 Sep 2008
Posts: 54
Location: Burbank, CA
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 Posted: Wed Oct 08, 2008 5:03 pm Post subject: Another throttle spring problem. |
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Larry Huntley asked me to post this for him, since he is having trouble posting. (I can sympathize.)
Jim
Hi Folks,
I have a different problem with a throttle spring. I am working on a Kitfox 2 (N815TL) with a 582 Rotax and 2 Bing carburetors.The aircraft has over 500 hours and is on at least its third owner. He wants to learn to fly on his bird,so I am concerned about getting everything right. I am familiar with Kitfox . I built a 4-1200 / Soob on which I have 500hrs.
On the model 2 the spring(s) is quite strong and pulls to CLOSE the throttle. In case of a failure of the throttle cable, it seems that it would shut the engine down. Is this the normal situation for this aircraft? I know absolutely nothing about Rotax engines so any help will be beneficial. This plane has a vernier throttle( which I don't care for) and the spring is strong enough to make the vernier difficult to manage. I have flown the plane only once. It seems to be a fine aircraft.
The other problem with this model 2 is the elevator. It is in the bottom of two holes at the leading edge. In flight the stick is much farther forward than in any other aircraft I have flown. If you line up the elevator and the horizontal stabilizer on the ground,this stick is in what feels like a more normal position. This means that in flight the elevator must be well into the down position. The owner says the seller had taken him for a ride in the plane,so he must have been flying it like this. Don't know how many of the 500 hours he put on it.
Sorry to be so long-winded,but wanted to give enough info to be able to get some logical responses.
Thank you for any help.
Larry Huntley - KF 4-1200 - Soob
EA81 -AMAX redrive - Warp Drive prop N234EE 506 HRS
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jetboy
Joined: 22 Jul 2006
Posts: 233
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| Posted: Thu Oct 09, 2008 1:48 pm Post subject: Re: Another throttle spring problem. |
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The carbs on the Rotax 2 strokes are quite different to the 912, being slide carbs they do have a spring that forces the slide shut and takes out the play in the cable control. The cables are braided pull cables, so they need to be operated this way.
So yes, in the normal use of these carbs a cable or linkage failure to any carb will shut the engine down. We had a Pelican 618 with this setup and added a WOT spring to the throttle system to give full power in the event of loss of linkage in the cabin. There is not much that can be done for the individual flexible pull cables, other than ensuring the linkage joints are secure and not prone to any twisting movement to the cables. The usual method of passing the cable end through a drilled bolt shaft between some jam nuts is marginal at best. My preferred way is to join the 2 carb cables with a motorcycle 2 into 1 junction, made of metal joiner, and run a single cable to the cabin. These joiners use regular cable ends and put no shear or twisting onto the cables.
Ralph
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Ralph - CH701 / 2200a |
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