Re: Throttle springs and HS adjustment


Subject:    Re: Throttle springs and HS adjustment
From:    Tom Jones (nahsikhs@elltel.net)
Date:    Thu Oct 09 - 10:14 AM
larry huntley wrote:
> 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 this 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


Larry,
The throttle system you describe is normal for the Rotax two strokes.  The cables
are pretty robust.  I do not know of any failures in flight.  I have and prefer
a friction type throttle.  I don't like the vernier either.

That Horizontal stab/stick/elevator position is odd.

Two things come to mind.  An adverse aft center of gravity and/or the flaperon
rigging is out of wack.  Did you have to hold forward pressure on the stick for
level flight?

--------
Tom Jones
Classic IV
503 Rotax, 72 inch Two blade Warp
Ellensburg, WA


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http://forums.matronics.com/viewtopic.php?p 8060#208060




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