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Old 10-20-2014, 08:51 AM   #15921
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Re: The never ending engine thread, East-West


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Phil... I'm all over the map on throttle set-ups... big servos, small servos, mini-servos, various linkages, fast, slow, high torque, not, right near the headers, far away with Nyrods. Perhaps I've been VERY lucky (my middle name seems to be "horseshoe" ), but never had an issue.

Correction.... I used 1960's epoxy on a servo mount on my Mintor220 and it caused a deadstick when it let go, LOL.
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Old 10-20-2014, 08:56 AM   #15922
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Re: The never ending engine thread, East-West

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To much pumping again. Lost another throttle servo. 3 in a year is concerning me. Yesterday a 5645 crapped out on the ground. What is everyone using for servos? Who is leaving the return spring on the carb?
I like to use a good quality mg servo. I don't remove the spring but I do unhook it and let it unwind half a turn or so. Then there is less pull on the servo. I don't care what anyone says I feel that constant pull on the servo is what burns them out. I had a servo burn out on my bench when I was build ing a plane. The elevator was just up against something, just a light push on the servo and after a while I see smoke. The servo cooked itself.
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Old 10-20-2014, 08:58 AM   #15923
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Re: The never ending engine thread, East-West

The other thing Jeff is to make sure that at full throttle the arm is not against the full throttle stop on the carb. That will not only have the servo working to push against it but also transmits high vibration back to the servo.
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Old 10-20-2014, 09:03 AM   #15924
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Re: The never ending engine thread, East-West

Listen to this "Super 08" guy. He seems to know what he is talking about. Chalked up flight #135 on a set-up of his this summer. Only issue. Ignition module failure at flight #80. Hard to tag that one on Doug @+32C outside that day.

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Old 10-20-2014, 09:19 AM   #15925
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Re: The never ending engine thread, East-West

Dale on that ignition. I had it on 7.4 volts. I have since read that even though they are rated for it that it burns them out. The 3W guys run them on 4.8 to 6 volts only.
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Old 10-20-2014, 09:24 AM   #15926
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Re: The never ending engine thread, East-West

Savox 1251 or 1252 on throttle . Spring left on idle screw in the garbage. Only ever had one throttle servo fail hitec 625
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Old 10-20-2014, 09:36 AM   #15927
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Re: The never ending engine thread, East-West

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Savox 1251 or 1252 on throttle . Spring left on idle screw in the garbage. Only ever had one throttle servo fail hitec 625
Maybe that is what I am doing wrong? The idle screw spring is messing with my set up.

I know what I need. It is a big f'ing servo with enough power to pull the engines bolts out of the firewall. No more using up the old 5645's I have sitting around. I got lucky on three failures. A forth one last year made me park a plane in a canola field. That stuff does not make for a very good landing.
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Old 10-20-2014, 09:42 AM   #15928
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Re: The never ending engine thread, East-West

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I know what I need. It is a big f'ing servo with enough power to pull the engines bolts out of the firewall.
LOL!!! Now you're talking!! Fut BLS172 or MKS777 should do the trick there
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Old 10-20-2014, 09:48 AM   #15929
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Re: The never ending engine thread, East-West

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LOL!!! Now you're talking!! Fut BLS172 or MKS777 should do the trick there
The Futaba may be the solution. I don't have a hobby king account for the other one mentioned. Lol.
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Old 10-20-2014, 09:53 AM   #15930
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Re: The never ending engine thread, East-West

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Savox 1251 or 1252 on throttle . Spring left on idle screw in the garbage. Only ever had one throttle servo fail hitec 625
If you are taking the spring right off that is not a good thing. It is also used to keep side tension on the throttle arm so it will not vibrate. This will lead to accelerated wear to the shaft and the valve with it removed. That is why I only unhook the spring. This is what was explained to me from several professional engine guys in the business.
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