Vernier throttle

[Happyflyer]

My Sportstar vernier throttle is suffering from the same problem that Wayne describes above. Does anyone out there know if there is a fix for this? Any help would be appreciated.

Only use the button when going to full throttle or back from full throttle. Use the vernier for all other throttle movements and you won't have the problem.

 

 

[SDQDI]

Only use the button when going to full throttle or back from full throttle. Use the vernier for all other throttle movements and you won't have the problem.

You will on those sport stars. Because if reducing power using the vernier to idle you get that 600 rpm jump up in revs if you try and slow down too much.

Actually I did my navs with Wayne in the SportsStar that he was talking about and I didn't like the throttle either, for mainly that reason of the unexpected jump in revs. I have a push pull throttle which either I or the right seat sitter can operate basically without removing the forearm from our knee which gives great fine control and the ability for instant full rev range changes. Actually the way it is setup the throttle is about where the hand naturally sits rather than a dash mounted one which requires you to reach.

 

 

[Happyflyer]

You will on those sport stars. Because if reducing power using the vernier to idle you get that 600 rpm jump up in revs if you try and slow down too much.Actually I did my navs with Wayne in the SportsStar that he was talking about and I didn't like the throttle either, for mainly that reason of the unexpected jump in revs. I have a push pull throttle which either I or the right seat sitter can operate basically without removing the forearm from our knee which gives great fine control and the ability for instant full rev range changes. Actually the way it is setup the throttle is about where the hand naturally sits rather than a dash mounted one which requires you to reach.

If that jump happens when winding back, your vernier throttle stop has been broken by a ham fisted operator. Unfortunately you need a new throttle. It doesn't happen on a serviceable item.

 

 

[rgmwa]

I have a combined vernier assist/push pull throttle made by McFarlanes in the RV-12. This throttle is now standard equipment in the RV-12 kits. Previously Vans only supplied the push-pull throttle (also made by McFarlanes). It's a recent design that is basically a push-pull throttle but with a vernier adjustment for fine-tuning.

 

http://www.mcfarlaneaviation.com/Details.aspx?Article=325

 

rgmwa

 

 

[dlegg]

Is it normal to have a lot of "slop" when using the vernier, as in winding the knob from out to in or vice versa? Mine can be wound at least 1 full turn before moving the cable in either direction. Apart from that, a great throttle.

 

 

[Mick]

I have flown 5 Sportstars & my Skylark with vernier throttles and none have had slop like that.

 

 

[dlegg]

Well, I can see a new cable being fitted in my near future....

 

 

[VFR Pilot]

I fly a Sportstar with the vernier throttle, I didn't like it at first but I got used to it and don't mind it know. I have never experienced any of the problems that have been mentioned here it seem's to work fine. In saying that, I fitted friction throttles in my Zodiac.

 

No play in the cable either Darryl.

 

 

[mAgNeToDrOp]

I've heard of the vernier throttle being wound back too far and bending the carburettor "arm" in a sportstar. Assume it was not tensioned properly or if there is a stop it's u/s.

 

 

[facthunter]

The "feature" making 912 throttles hard to keep at idle is the fact of having 2 carbs each with an idle stop and having springs trying to make the throttles go to open as well as duplicated cables (split for part of the the cable run). You always have to apply a force to keep the throttle closed whether that is by holding it , having a throttle friction feature or a vernier. The spring force to open is a fail safe design, but a nuisance unless everything is adjusted perfectly. The cables must open evenly and close together. The idle stops should be synchronised prior to setting cables..Nev