What should I do with a new G-61?

I need some advice. I just picked up a new S.T. G-61 ringed engine. Obviously, to run as a stunt motor, it will need a venturi. Other than that, does it need other modifications? If so, what? Who does good work on them...Leonard...someone else?

I know Leonard has tongue mufflers for them, and I'll probably go with one of those, rather than the stock bigger-than-the-engine-itself muffler.

Tom Lay specializes in STs. Contact him at [email protected].

I'd be inclined to put it in a Tether Car, and I'm serious. I know John Hall has a car set up for one, but doesn't have the engine. Maybe a swap would be good? If you insist on a stunter, something around 800" with a short nose. Finding room for enough fuel will be a problem if the engine runs 4-2-4, but with a Leonard rework, it might not be so bad. Finding large enough props might be expensive. A big P-47, Bearcat or FW-190 would be cool. Steve

>If you insist on a stunter, something around 800" with a short nose.<

Steve
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Steve, I was thinking of a Flite Freak, with a span somewhere between seven and nine feet. That will make the wings about five inches thick, and they should handle the bladder pretty well. A fifteen inch prop...I'm gonna need some mondo landing gear

I would avoid a profile at all costs. A scaled up Veco Warrior or Squaw would be neat. There's a "Super Chief", why not a "Super Squaw"? You could also use it for a sunshade or rainfly, should the need arise. With a venturi, the engine should be about 18 oz. I'd probably check with Davis Diesel to see if they have a conversion head. Why fool with little 15" props when you can use 18"+ diameter? The Tether Car sounds better all the time. Steve

If you mean the legendary ST 60 small case, it is an outstanding stunt engine. Many folks run them stock, with an extra head shim or two. Many will also suggest they run BETTER with rework: usually hemi head, better bearings, and cutting down the head fins to keep the fire hotter. On the east coast, Big Jim Greenaway still does his magic to Tigers: (718) 529-4631. In Amarillo, Don Blackburn does similar: (806) 622-1657. With a nominal .305 or so venturi, expect to use 6 ounces of fuel for the pattern. Absolutely a great stunt engine!

Is this the newer "Block Head" (square)G-61 BB, ringed, your asking about, Denny? I've wondered about them also. Weight of these later models jumped quite a bit in r/c trim. Interesting thought though, ..hmmm, what would one of them pull?
Tony

>Is this the newer "Block Head" (square)G-61 BB, ringed, your asking about, Denny?

Yes, the newer version with the square head and four head screws. I was going to weigh it, but the 9v battery in my scale picked this morning to puke. I can't think of anything else in the house that I can steal a battery from. I'll pick up one of them and let you know later what it weighs.

It will definitely get a tongue muffler. Three of us spent parts of three days at the Nats trying to get a G-51 to run right. It's in a Magnum, and of course it had been running perfectly the week before. One of the problems we had was a vibration. The engine was tight, but that huge can muffler was picking up a harmonic and vibrating so badly that the outlet tube was blurred. We ended up moving the muffler further out on its header tube, and that settled it down...but not before two or three things had loosened up on the plane. A tongue muffler should eliminate that crap, and save quite a bit of weight.

Denny

Denny,
How about 18 oz's, or 510 grams, minus muffler, carb/venturi, includes glow head/prop washer and nut. This is +/- .2 oz's (the limits of my scale). Got one of these puppies sitting here in the "to fly" pile. But what to fly, that is the question? Regards.

I've pretty well decided to put it in a Flying Fool. A plane with such wing loading should have such a dainty engine.

Throw it at a cat!!!!!!

Sorry, I was just in a humerous mood. They are a brick of an engine, and I used to throw bricks at the neighbours cat when it tried to catch the fish in our pond.