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My 2 cents also - -
Recently did BFR in a 172, and found myself not putting the throttle where I needed it. With the 12, just release it, and you take off. 172 didn't want to go ! ! ! ! :D Just takes time to get used to. I don't even think about it now.
John Bender today - 330.7 hours |
And another user preference...
I haven't had any trouble with the stock springs and throttle friction adjustment. Even landing I don't notice any creep problems, although my hand is on the throttle as it should be.
Perhaps there are minor difference in throttle/cable friction from plane to plane? I haven't flown but two RV-12s, mine and 412RV. I would recommend current builders try the stock configuration before making any changes. |
Replacement springs
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There is an article in the December 2011 issue of Kitplanes Magazine about the RV-12 that Dave Martin built. Here is a quote from page 10:
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Joe Gores |
Maybe something has changed. The position of my throttle does NOT creep one bit once locked. Pulling the throttle out of your hand is an over-statement. FAR from FACT!
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too much variation
There must be something going on here. Different RV-12s should not give pilots such different experiences. Perhaps we should be looking for the variable. My money is on the leather washer. In my aircraft it is a very loose fit in the tube, and literally as dry as a woodchip. The cone to compress it hardly marks it.
I suspect the quality of leather used is far harder to control than other materials. Perhaps some of us got dodgy leather washers. Rod |
I just learned, thanks to Mike Tea, way back, Van's DID start to send a different throttle cable. The very early kits had a different model and that MAY be the reason for the differences.
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I'm going to change my springs
I've been lurking, watching this thread with interest, and now I feel inclined to comment. Marty, Tony, and John B. are all friends of mine, and I respect their opinions on everything RV-12. However, my experience has been different than theirs. I have over 50 hours on my '12, and the throttle creep is a constant annoyance. In cruise in order to hold a power setting I have to crank the friction knob down as hard as I can, to the point I am afraid of breaking something. With this much tension the throttle it is impossible to move. On landing approach, I can't keep the engine down to idle unless I do the same, setting up a bad situation if I need power in a hurry.
When Joe got his first batch of replacement springs I had him send me a set, but I did not want to install them until I gave myself sufficient time to get used to the original springs and for the mechanism to "break in". After watching this new thread I have decided to install the weaker springs. I think I have given the originals a fair trial. My advice to newer builders is to live with the originals for a few hours before changing. Your installation may have different characteristics than mine and be trouble free. Joe, as always, thanks for your thoughtful analysis of this issue, and for your research in finding a replacement spring that can be adapted to our use. |
Here is a quote (with name deleted) from an email that I just received.
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Joe Gores |
Throttle Springs
Joe, add me to the list of those wanting throttle springs. I think $10 is more than a fair price, considering the hassle you have to go through to handle.
Walt Shipley |
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