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Old 08-08-2010, 08:51 PM   #1
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Smile my first twin

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i purchased a C-160 Transall from a fellow rc canada member in the spring and it should be ready to go soon. i could not find ANY reasonably priced .25's anywhere in canada. $150 for an O.S. 25 ax is darned ridiculous in my opinion and i would have needed two. i finally bought two Thunder Tiger Pro 36's from tower hobbies in the states. i paid $158 U.S. including tax and shipping to my door in seven days for the pair. anyway, i have several hundred hours of flying time in full size twins(cessna 401, 404, 421, piper seminole, navajo), but what should i know about rc twins? any helpful hints would be gretaly appreciated. cheers, john.
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Old 08-08-2010, 10:15 PM   #2
Glenn Nigh
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Re: my first twin

John, Wear Diaper for the first flights! )) Get both motors broken in and reliable. Tach them as close as you can. Good luck you will love it. The sound is awesome!
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Old 08-09-2010, 07:46 AM   #3
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Re: my first twin

Sounds like its going to be fun John.
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Old 08-09-2010, 07:58 AM   #4
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Re: my first twin

I had the odd engine out on the GP profile P-38 with 2 FX.25's The model was very fast and a tad heavy and never did have much of a glide. Landing normally were fast flat and level letting the grass slow here down. If motor goes out best goto full throttle the motor to keep the airspeed up and air going over the tail feathers. Limp back doing gentle turns and throttle back just before touch down. This saved me twice. 99% of time tacked engines and had no problems. Good luck!
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Old 08-09-2010, 10:49 AM   #5
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Re: my first twin

Quote: "...Tach them as close as you can."

No two engines are going to run exactly the same at the exact RPM. One engine may be optimal but the other may either be a tad rich or a tad lean and you will find that engine is the one that will quit on you in flight.

Your best bet is to set each engine up individually for optimal running and leave them at that. Don't worry about the difference in RPM just fly the plane. You will find that you seldom if ever will have one engine flame out and the difference in RPM will be hardly noticeable if at all!

Had a friend at the club so frustrated with his twin that he decided to list it for sale. Said he never completed a flight without one engine quitting on him. He said he spent a lot of time tuning and tacking to get both engines at approx the same RPM but he always got one engine flaming out.

I offered my suggestion and he and I tuned each engine individually as stated above. He flew his plane for a 12 minute flight and landed with both engines running. He said that was the first time ever that he landed under full power. He kept the plane and very rairly ever had that problem again.

I cannot remember which month and year but I had found this info in a Model Airplane News magazine some years ago and it works every time!
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Last edited by Gary Maker; 08-09-2010 at 10:53 AM.
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Old 08-09-2010, 09:19 PM   #6
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Re: my first twin

I've seen many a twin auger in due to an inexperienced flier at the sticks. Asymmetrical thrust can be a killer or "Nothing" depending on the plane. You need to know how your plane handles on one engine. Each plane is different, even from the same model, they behave differently (this is before cookie cutter "arf" days)

In either case ALWAYS have a backup plan of CUTTING THE REMAINING ENGINE when you have an engine out and control is questionable. Once the second engine is out, the plane handles normally again. Bring 'er in for a deadstick landing and you are safe.

Most of my twins fly great on one engine. I can fly full circuits, left and right turns on one engine. I did get cocky once and tried to continue flying after I had an engine out just after takeoff and tried to "bully" it into the air, I should have cut the good engine and landed straight ahead!!. I couldn't maintain directional control at low speed and the high angle of attack that was needed at take-off. It ended up sweeping right and got stuck in a tree, but no damage, only hurt my ego. That was the one and only incident I had with a twin giving me trouble.
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Old 08-09-2010, 10:11 PM   #7
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Re: my first twin

I love flying my twin. It's sound and speed are amazing. I had one engine quit on the maiden flight. What a knee knocker that was.... Luckily I had enough airspeed to be able to throttle the good engine up to fly the circuit and bring her home in one piece. It all depends on the height or airspeed your twin is flying at when you lose one engine. If you have enough height you can dive a little to bring the airspeed up,then bring the throttle up on the good engine.
Most twins will fly with one engine as I'm sure you know. I think it all depends on the airspeed, what your action should be when you lose an engine. Slow airspeed, bring throttle back to idle or dead stick as Max explained. Or if airspeed and height are permissable, throttle up good engine and fly her home.
As far as setting up engines, I tach both engines to get peak RPM,then richen a few clicks as you would normally. Then knowing the engine that has the higher RPM I richen it further to bring the RPM to within 100 RPM of the slower engine. Always richen the engine with the higher RPM to the slower engine. Provided the engine you richen does not four cycle (2 stroke engines). If it four cycles to much then it becomes a throttle servo set up issue.
When I set the idle I use my sub trims on my radio to bring them as close as possible.
I have used this set up procedure now for the many flights I have had with my twin, and I have had no other issues with engine out senarios.
Just a few things to be aware of. Once you get over the initial fears of twin engine aircraft you will find that twins are not that complicated and are very enjoyable to fly.
Good luck and may you enjoy many,many flights with your twin...
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