J

jsenft

Well Known Member
I took my first flight in a airplane powered by a rotex 912 yesterday. I was enlighten by the spring loaded throttle. Flying C172 for most of my hours, I am concerned with the full power spring loaded throttle. After certified Elsa, has anyone changed this setup to function similar to a c172?
 
Not on an RV-12, but I did build a CH601HDS using a Rotax 912 back in the mid-nineties. I changed the throttle arrangement to pushrods from the firewall to the carbs. The aircraft now has about 1500 hrs and has experienced no problems whatsoever.
 
my jabiru 3300 has a bing carb with a spring loaded throttle. it was very difficult to use. i ended up removing the spring so the throttle was like a cessna.
after thinking about the benefits of a spring to take engine to wide open i reinstalled a weaker spring. much more comfortable but the throttle will creep to full power if not locked. in my mind i guess full power to your emergency landing site is much better than no power. you might arrive at your chosen emergency airport at 8000 feet but that is a much better scenario than what no power would get you. my linkage is not stranded cable but one large solid cable.
 
While on this subject, I have a question that has bugged me since I made my first flight (only one month ago): when you move the throttle, do you unlock it completely or do you leave some friction to make adjustments of power easier and more precise (which is what I do)?
My previous experience was with the Sportcruiser where my instructor insisted that I unlock the friction completely while moving the throttle. Note that the Sportcruiser has a quadrant with a different friction mechanism than the RV-12 but I still have some doubts about my practice with the -12.
 
for me my throttle lock has only 2 positions.....locked or fully unlocked.
i want the throttle instantly ready if i have my hand on it. i lock it again when i am ready to remove my hand.
 
Do a search - there are lots of posts about putting in weaker springs along with specs and links of those . I did that - it is a great improvement. The function is still there but the "fight" is gone!
 
Bill_H said:
Do a search - there are lots of posts about putting in weaker springs along with specs and links of those . I did that - it is a great improvement. The function is still there but the "fight" is gone!
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I understand this option, Bill but even with the weaker spring, I still may find some friction helpful when I move the throttle. My question: is a small amount of friction damaging when I move the throttle?
 
I experimented with Harbor Freight springs and found weaker ones. They creep a little at idle, but are fine in cruise. I unlock for takeoff and put in some friction after takeoff.
 
Jean-Pierre, the Sportcruiser has small teeth that lock the throttle and they can be stripped if not unlocked before movement. I have 190 hrs on my 12 and always leave some friction on the throttle with no problems noticed.

Rick.
 
morsesc said:
Jean-Pierre, the Sportcruiser has small teeth that lock the throttle and they can be stripped if not unlocked before movement. I have 190 hrs on my 12 and always leave some friction on the throttle with no problems noticed.

Rick.
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Thanks Rick, your answer is right on target and solves my problem.
 
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