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Large Engines Discuss Engines Used on Giant Scale Aircraft. Gas/Glow, as long as they're big!

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Old 10-22-2006, 07:11 PM   #11
Randy Brown
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You think this would be done already

Originally Posted by scaleguy
Don and John,

I was actually just over on RCU asking these same questions.

Don you read my mind on the $1000 question. I asked it over there. Now let's sea if I get any answers or labelled as a trouble maker. I almost said I was thinking about going back to DA but then i would get flamed for sure.

Yes some suggestions were to grind off the arms bet then you loose the throttle stop and you could end up with the butterfly valve all screwed up.

Apparently you can't just bolt on a ball link as you would only get about 1/4 travel on your servo then your throttle resolution would suck. Dick Hanson, who tested the prototype and is still flying it, said you want to get the arm long enough to give you about 1 inch of throttle arm travel.

The problem I see is there isn't a heck of a lot of metal on the existing throttle arm lever to bolt anything to.

Here is a pic of a modified one but like I said.. no detants.

Joyn that long shaft with the cone shape on it looks like its adjustable for setting the physical through of the butterfly valve for idle. It has a little slot in the end to which allows you to thread it in or out.

Dick says to clip off the retaining part of the spring to remove the tension so the arm will not return to idle but you must keep the spring on to stop the shaft from sliding back and fourth.

Steve i really don't want to start griniding things unless I really have to.
Oh well I guess I got about 7 months to figure it out.
Randy Brown
MAAC 45752L
Team Airtronics
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Old 10-22-2006, 08:28 PM   #12
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Originally Posted by Randy Brown
You think this would be done already

Takes about 5 min ... Even you could do it! :P
Mike Clemmens
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Old 10-23-2006, 12:24 PM   #13
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Yes anybody can grind the throttle arm off and attach the right one but why. I expect to do that on an engine I am modifying but not something that is supposed to be ready to go.
Are you a trouble maker. I don't think so as the question is how to get it so you can use it. What would a guy do if he does not have all the supporting tools like a Dremel. I went for years with out a lot of the newer type tools. A package of #11 blades, coping saw, sandpaper and what ever I could scrounge. Maybe I am in the same class and expect to much.
John Davidson
Keep the shiny side up and the wheels down
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Old 10-23-2006, 02:10 PM   #14
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Throttle arm

If Jim had bought another DA, he'd know this would already be done for him. Kidding aside, the Super 80 seems like a great motor.
Jim, I'll do the mod for you if you want to drop by one night.
Stephen Johnston
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