Metal Throttle Arms & Linkages
03-29-2010, 06:05 PM
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Metal Throttle Arms & Linkages
Hello !
I just finished my Tiger 60 kit, and have come to the throttle linkage installation.
The engine, a Thunder Tiger 61 Pro, has a metal throttle arm, with a few pre drilled holes for the linkage.
Unfortunatly, the holes in the arm are too small for a conventional plastic link (can't use metal), and the link can't be drilled out - the arm is only just big enough for the holes to begin with!
As of now, the only link Ican fit is a thin music wire zed bend.
Any suggestions on making it work?
Thank you,
Graeme
I just finished my Tiger 60 kit, and have come to the throttle linkage installation.
The engine, a Thunder Tiger 61 Pro, has a metal throttle arm, with a few pre drilled holes for the linkage.
Unfortunatly, the holes in the arm are too small for a conventional plastic link (can't use metal), and the link can't be drilled out - the arm is only just big enough for the holes to begin with!
As of now, the only link Ican fit is a thin music wire zed bend.
Any suggestions on making it work?
Thank you,
Graeme
03-30-2010, 08:49 AM
#7
RE: Metal Throttle Arms & Linkages
For what its worth never ever use a Z bend in a metal throttle arm, that is a ticking time bomb especially with 72Mhz. Its only a matter of time before the Z bends wear the metal hole sufficiently to start producing vibration induced stray RF.
Ball joints are fine however my normal pushrods I always setup with thin flexible piano wire around 30 thousandths and solder on threads with a nylon clevis and an EZ juster at the servo arm. . I have used many of the 40 TT Pro (in pylon) and still have a few of the .61 which uses the same throttle arm and do not recall any problem using nylon clevis in the trottle arm that a simple chasing of the hole with a 1/16th bit would not cure. Also if I remember correctly of the two factory holes in the TT throttle arm the inner hole is for whatever reason a bit smaller than the outer hole. If you are using that inner hole I would reccomend you instead use the outside hole.
It provides the best mechanical advantage with average servo arms to best setup your throttle endpoints without resorting to excessive electronic endpoint reductions which reduce response resolution.
John
Ball joints are fine however my normal pushrods I always setup with thin flexible piano wire around 30 thousandths and solder on threads with a nylon clevis and an EZ juster at the servo arm. . I have used many of the 40 TT Pro (in pylon) and still have a few of the .61 which uses the same throttle arm and do not recall any problem using nylon clevis in the trottle arm that a simple chasing of the hole with a 1/16th bit would not cure. Also if I remember correctly of the two factory holes in the TT throttle arm the inner hole is for whatever reason a bit smaller than the outer hole. If you are using that inner hole I would reccomend you instead use the outside hole.
It provides the best mechanical advantage with average servo arms to best setup your throttle endpoints without resorting to excessive electronic endpoint reductions which reduce response resolution.
John
03-30-2010, 03:43 PM
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RE: Metal Throttle Arms & Linkages
Thanks John -
I don't believe that the throttle arm on my engine is original - I picked it up for five bucks at a garage sale (Ok, grabbed it when I saw the price, and made sure no-one else was out to get it!
).
I tried every linkage that I have laying around, and they are all far to big. I am using the outer hole, so that shouldn't be a problem, but the fact that I can't enlarge it is. There is almost no material outside the hole, but it is still very strong.
I think I will order the Du-Bro part - it looks perfect, just means I have to wait longer to fly it!
Thank you
Graeme
I don't believe that the throttle arm on my engine is original - I picked it up for five bucks at a garage sale (Ok, grabbed it when I saw the price, and made sure no-one else was out to get it!
).I tried every linkage that I have laying around, and they are all far to big. I am using the outer hole, so that shouldn't be a problem, but the fact that I can't enlarge it is. There is almost no material outside the hole, but it is still very strong.
I think I will order the Du-Bro part - it looks perfect, just means I have to wait longer to fly it!
Thank you
Graeme
