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General control line discussion => Open Forum => Topic started by: frank mccune on April 23, 2015, 08:35:10 AM
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Hi All:
Which would be better to power a Ringmaster Jr? What size and length of lines should be used?
Tia,
Frank McCune
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All of the Cub engines were on the anemic side of the power curve. Use the 19 with a 2 oz tank. it will provide decent sport flying performance. It has one advantage it is a light piece of metal.
Dennis
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I had a Cub .149 on a PDQ baby clown. It barely had enough power to power it and it liked to catch fire on starting. It was almost worn out.
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Frank,
I had one with the Cub 14, we used an 8x5 PowerProp about 2 oz uniflow, fly it on 0.012"cable ~ 52 -54' C to C. If you run it in a rich 2 cycle it will due fine, also could use the Cub 19 (clip 9x5 down to 8.5" prop) on 58 - 60' same diameter lines. Only drawback is not having a muffler, if you are out were noise is not an issue no problem.
Best, DennisT
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my first big plane was a guillow's trainer #2 with a green head K&B 15 and would out run the two guys with Cub 19's .next plane was a R/M jr with the 15,on 60 ft lines i did my first loops with it ,i am sure it would have flown better on about 55 ft i would go with the 19.
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my first big plane was a guillow's trainer #2 with a green head K&B 15 and would out run the two guys with Cub 19's .next plane was a R/M jr with the 15,on 60 ft lines i did my first loops with it ,i am sure it would have flown better on about 55 ft i would go with the 19.
Bob, If you mean trainer #3 then that was my first plane also, with a K&B Greenhead 15 ! Talk about a tough plane. On the day of my first successful flight, I stuck it straight in the ground 4 or 5 times overcontrolling it!
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I would say the 19 also.
The 14 would be cool if you get a set of plans from Pat King for his RM junior plane and build it light. I got the plans from him and plan on using a Cox 09.
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LOL. First successful CL flight (c.1954) was on a Ringmaster Jr./OK Cub .14 on 35' lines. Very docile, to be sure, but it did the job. Second Ring' Jr., also Cub .14 powered, was much lighter, hand-launched (no landing gear), and would loop and do mild Figure Eights. Prop was a Tornado Plastikote 7-6 on both. Francisco Powermist fuel.
Ahh....memories!
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After beating hollow logs to death with an OK Cub .049, I built a Jr. Ring with a Fox .15x slant plug. I learned to fly inverted on it and also learned how to repair crash damage almost every time I flew it. Somewhere in there I had a trainer of some kind with an OK Cub .19 although I don't think I ever flew it. I still have OK .19. I gave away the Fox 15x last year.
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In 1955 I learned to fly the AMA stunt pattern on a Ringmaster Jr, with Cub .14 for power. On 52 ft lines it was actually a good combination. It was a very light airplane and the Cub had plenty of power on .012 52 ft lines (center to center). I was primarily a combat flier prior to that (and after for that matter), but had seen a couple of guys in our club fly stunt and it interested me. The "Ring" Jr was a pretty good flying airplane with that light engine. It was capable of the complete pattern and eventually I learned to fly a respectable (at least recognizable) pattern with it, then built my first Nobler when the "Green Box" kit first came out.
I do remember that the Cub was a little hard to start but ran very well in a wet two! 8-5 Top Flite prop (I think).
Randy Cuberly
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My first "gasoline model airplane motor" was an OK Cub 14. It "propelled" my Guillow's Trixter Trainer, then a Jr. Ringmaster, and finally, a Sterling P-40. Always over-propped with a TopFlite 8x6 and under-nitroed with Testor's 39. Looks like I was in good company.... :)
dale g
To get back to the question, the Cub 19 would be a better choice, in my opinion.
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Frank, with all this input I'm looking forward to your flight reports. Oddly, I never flew a CL model with any Cub, I used them for FF. My FireBaby had Royal Spitfire and my brother's a Wasp. I did consider using an OK .35 at one point but after the bench run I decided NO ONE should be subjected to that noise!!!!