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Ms Dixie Fine Tuning

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mdnanwelch7(at)hotmail.co
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Posted: Fri Jun 22, 2007 12:35 pm Post subject: Ms Dixie Fine Tuning

Paul,

   A few years ago I restored/rebuilt a Wizard ultralight.  Many pieces were 

missing, so I was left to come up with my own unproven designs on a couple 

of parts.  One of the things that turned out to be in need of improvement 

that I built was the throttle.  Mine, like yours, was touchy as a son of a 

gun!  I had a friend test-fly my Wizard (Quicksilver clone) and he really 

suggested fixing it, too.

   By moving the push/pull point closer to the pivoting point on the 

throttle lever, I significantly changed the rpm  range when applying power.  

Now, when you push the lever to increase power a 1/2" you get 50 rpm 

increase, instead of 300 rpm.   So, instead of an overall throw of 2 1/2" I 

ended up with a 7" throw.   (These numbers are from memory, but you get the 

idea.)

   So it is my experience, and opinion that you might really consider 

improving the throttle response to not being so touchy.

If your set-up is like mine was, a lever you push and pulled, then all you 

need to do is relocate the attach point closer to the fulcrum.  (Cut the 

distance in half and see how that acts)

  Of course, the overall distance of throw will limit the attach point, 

also.  You will want to make sure you still have the full rpm capability.   

The geometry has to make sense!!!

  One more thing to consider would be the safety aspect.  I believe it would 

be very possible to experience PIO  (pilot induced oscillation) if you can't 

control your RPM range precisely.  (That's kind of what my friend 

experienced.  He said there was "no control", just rapid changes to much 

different RPM settings!)

               Best of "training" regarding your first flight, ( I don't 

believe in "luck")

                                                                             

         Mike Welch in SW Utah



BTW.  My shop and pool I have been building are virtually finished.  All 

that's left on my shop is the doors I am going to make.  Here's a photo with 

my MkIII and the GlaStar.



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Steve Boetto

Joined: 11 Jan 2006
Posts: 365

Posted: Sat Jun 23, 2007 5:36 am Post subject: Ms Dixie Fine Tuning

Very nice Mike

  

 steve

  

 do not archive



See what's free at AOL.com. 

  [quote][b]

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Paul Petty

Joined: 11 Jan 2006
Posts: 226
Location: Mississippi

Posted: Sat Jun 23, 2007 3:21 pm Post subject: Re: Ms Dixie Fine Tuning

Thanks Mike! as of today we looked at the pivot point on the throttle lever at the main connection and there is plenty of room to get the connection closer to the center of the rear quadrant.....Kolbras work the throttle from the rear seat lever via a push pull tube to the front seat. what the upper cable slot is and it's attach point is still a mystry to me!

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_________________
Paul Petty
Kolbra #12
Ms Dixie
912 UL 70" warp

blackbird

Joined: 10 Jan 2006
Posts: 51

Posted: Sun Jun 24, 2007 11:11 am Post subject: Re: Ms Dixie Fine Tuning

Hey Paul,



I think the throttle part you described is from the OLD days.......LOL

On a two stroke it was used for the choke (enricher) circuit..........



I know......only on two strokes..............LOL



Mystery solved................

WT

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