Control Lines For all you fly-by-wire fanatics!

Can I use an RC engine for CL?

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Old 08-06-2017, 03:41 PM
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JPMacG
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Default Can I use an RC engine for CL?

Our RC field is affected by the FAA Temporary Flight Restriction surrounding the Trump Golf Course in Bedminnster NJ. Usually the TFRs just last a weekend, but the most recent is a long one - almost all of August. So some of the club members are thinking about trying CL at our RC field. CL is not prohibited by the TFR.

I have not flown CL in about 45 years, but I remember liking it as a kid. We can put a CL model together in a few days and we all have spare glow engines with RC carburetors. Is there a reason not to use these for CL? We are thinking of just a simple mechanism to allow manual adjustment of the throttle. Crack it open a little to start the engine and then set it to full throttle to fly. Or is there something that we are overlooking?
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Old 08-06-2017, 04:20 PM
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JPMacG
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OK. I see that this question has been asked and answered many times. I found my answer with a search. My apology, I should have searched before posting.
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Old 08-06-2017, 05:05 PM
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JohnBuckner
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Yes you can and my preferred setup is an RC engine with a conventional clunk tank. I currently am using an OS .40FP, OS .35AX and a Saito .30FS all throttled engines. Actually I do not bother with dead ending the throttles but instead use 2.4 radio and utilize the throttles. those endless touch and goes made possible by that is a true joy.

John
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Old 08-06-2017, 05:15 PM
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Sure can, I replaced the carb. with a Venturi and spray bar on my os40la. A Great running engine
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Old 11-22-2017, 09:12 PM
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clscale-Fred
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Here is another solution, install a bellcrank and an elevator servo. If you wan to fly RC have the elevator pushrod connected to the servo. If it is connected to the bellcrank it's a CL model. All of my models except for the speed models have throttle control and they are a typical RC glow or electric setup. install the leadout guide and wingtip weight if flown as a CL model.

We are allowed to use 2.4 Ghz with CL so I use a typical RC transmitter and my scale models have a 2.4 Ghz receiver in the model.

Fred Cronenwett
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Old 11-28-2017, 05:27 AM
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Glow Engine Operators - if you prefer a venturi (Needle Valve Assy) carburetor set-up ... then see BRODAK, JUST ENGINES or MECOA for their line-ups of venturis (NVA's) or search for other web-based sources for such parts. You will need to know the engine case carburetor mount bore (usually in mm) and some NVA mounting information for your specific application. My experience has been that most RC carburetor glow engines will respond very well to such conversion treatment.
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Old 11-28-2017, 12:25 PM
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Of course the very easiest , method of using an ex RC engine (something that is becoming more and more common these days as the perceived disadvantages of doing so is for most almost imperceptible) is illustrated in the first photo, a simple rubber band and a few seconds later you are ready to go. Alternatively the second photo shows another simple extenstion on the throttle arm with a band around the fuselage to secure your settings.. This method makes starting easier and opens up a selectable performance control.

Of course like clscale-Fred above using a modern 2.4 system is almost effortless and opens up the sport of controlline unlike any other advance over the years.

Although I have a rather large hanger of RC craft I do keep active with a Magician, Skylark, Nobeler, Ringmaster Jr, Ringmaster S-2 and a old school Bearcat carrier plane. Of those six, all are absolutely equipped with throttled RC engines and of those three are operated with 2.4 systems. The Bearcat is a three line system and will stay that way (and excellent reminder to the superiority of the 2.4 systems. The Ringmaster S-2 being the newest to my controlline hanger for now the new Hirtenberger .25 RC is just fixed throttle I will soon be adding a 2.4 set up.

John
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Old 07-11-2018, 06:54 AM
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r ward
 
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when I was younger (young teen in the 70's), there were belcranks and handles made for a third line to control the throttle of your plane and r/c engines were used all the time. the handles had a trigger in them that you squeezed to idle the engine and the belcranks slid to compensate for the cable movement. I have looked around and not seen them anywhere anymore, wondering if people still build u-control with controllable throttles.
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Old 07-12-2018, 07:51 AM
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Check with Melvin or Brenda MBS Model Supply
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Old 07-13-2018, 07:17 PM
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Brodak sells three line control systems.
I think they are a copy of the JROBERTS system that we used back when.

They worked fairly well but I did experience a fairly high wear factor in their bellcrank slide mechanism.

have fun with u control throttle flying.
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Old 07-18-2018, 02:25 PM
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robert waldo
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Rc engines work just as good on control line. After 41 years I started flying control line again. Forgot how much fun it is. I usually just spring loaded the throttle if I wasn't using it.
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Old 07-18-2018, 05:17 PM
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TO: JPMacG, Post #1.
It might help to have some FAA documentation along, and a polite buddy to explain it to Officer "Friendly" if he shows up uninformed and with a low tolerance for backtalk.
I was among a group flying CL near a big golf course, and run off with threat of arrest, when a duffer complained we were buzzing him, about a quarter mile away.
Didn't matter to the badge wearer.
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