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Post by Patch on Mar 31, 2005 16:22:17 GMT -7
I'm looking for an engine for my Kyosho Pitts Special S-2C 40. It's rated for a 2 stroke 40-46 or 4 stroke 48-53. I've never owned a 4 stroke, but am leaning that way because I may install a smoke system later. So far I see an FS-52 Surpass for $190 (US) and a Saito FA-56 AAC for $198 what about these engines, and what about others? (and as a combat flyer who doesn't know any better) how big can I go without killing anybody or ripping the wings off?
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Post by Britbrat on Mar 31, 2005 17:41:39 GMT -7
---- as a combat flyer who doesn't know any better -- how big can I go without killing anybody or ripping the wings off? In your case ripping the wings off is a forgone conclusion. I suggest the Saito because it costs more & it undoubtedly makes more power --- go for it. You can also get a nice GMS 76 for $129 CDN -- that will really get the wings interested. I put one in a .25-sized Blue Movie & the wings haven't come down yet. PS. Buck up son it ain't just you -- all combat fliers don't know any better
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Post by Grug - American Neanderthal on Mar 31, 2005 18:40:32 GMT -7
I favor 4 strokes and Saitos in particular. They are light for a 4c and reliable and give you great throttle response for aerobatics. Granted, this is another of those " I dont have one but..." posts According to specs its supposed to come in at 6 lbs, I would go with the 56, or even the 72 if you can stuff it in there. The 4c will let you swing a bigger prop which will overcome the drag of thye biplane better.
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Post by Patch on Apr 10, 2005 17:40:37 GMT -7
well.......the budget called for a 2 stroke so I went with the OS 46AX. Hope it does all right. any reccomendations on a prop for this? calls for 10.5x6, 11x6-8, 12x6-7. I'm thinking a 12x6. Should I do the break in with the stock muffler or the bisson pitts muffler or does it even matter?
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Post by Richard on Apr 11, 2005 9:24:15 GMT -7
You can use the bisson muffler for the break in. I usually use a light prop for a couple of tanks of fuel as it don't put much of a load on the motor. I would use a 11X6 till the engine is broken in then rey a 12X6 if you want.
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Post by Britbrat on Apr 11, 2005 15:30:02 GMT -7
Patch, a 12-6 is wildly too big for an AX. An APC 12-4, or 12.25-3.75 is what you need for that engine & airframe (I ain't funnin ya this time).
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Post by Richard on Apr 11, 2005 16:38:26 GMT -7
INCLUDES: One O.S. Max .46AX ABL BB model airplane engine with muffler, A3 glow plug, 2-1/4" (57mm) section of tubing for remote needle, two 3mm x 35mm cap head muffler screws, warranty sheet, decal sheet, and illustrated instruction manual
REQUIRES: Fuel containing 5%-20% nitromethane with at least 16% lubricant Most of the fuels we carry meet or exceed the lubricant content required for optimum performance and maximum engine life. In the past, the conventional lubricant content used in fuel was 18%. But with new advanced technologies, fuels like Red Alert and O'Donnell for example, have a better quality of lubricants even though the percentages of lubricant content are lower. These high-tech lubricants provide exceptional cooling and protection.
SPECS: Displacement: 0.455 cu in (7.45cc) Bore: 0.866" (22mm) Stroke: 0.772" (19.6mm) Practical RPM: 2000-17000 Power Output: 1.65ps/16000 RPM Weight: 13.2oz (375g) without muffler Weight: 17.2oz (489g) with muffler Recommended Propellers: 10.5x6, 11x6-8, 12x6-7, use 10x6 for break-in Crankshaft Size: 1/4-28
Here it is right from the evil empire you can use a 12X6-7 prop. Guess the 20% nitro makes the additional power to swing a 12" prop.
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Post by Britbrat on Apr 12, 2005 5:40:06 GMT -7
Like their HP ratings, they lie like a rug about the props. I've more than a little experience with these motors & they just can't swing a 12-6 with any effectiveness -- in fact they struggle with a 12-5. The motor runs OK, but it falls way off the power & torque curves. They can't swing an 11-8 effectively either, & an 11-7 is just so-so. They really crank on an 11-6, but it doesn't have enough disc area for a blunt, large-cowl plane like a Pitts. The Pitts will do ~ 50 mph with a 12-4 -- which is plenty for that model.
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Post by Grug - American Neanderthal on Apr 13, 2005 8:23:05 GMT -7
I tend to agree, they may lidt the prop, it will turn it, but it wont fly worth a darn.
It also depends on how you like to fly, I dont like the wide open throttle all the time. Even though a flat prop will work if you have to keep the rpm up over 10k to keep speed up so it doesnt mush around, I dont feel comfy. Of course I overpower most of what I have so take that into account.
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Post by Britbrat on Apr 13, 2005 13:36:35 GMT -7
Various prop pitches & diamaters actually won't make much difference in level speed to a bipe (nor will more power), but it will make a helluva difference in take-off, acceleration, sustained turn & climb. A typical bipe will not see much difference in level speed between 1/2 throttle & flat out --- it will, however, show up when you start to climb (or take-off for that matter). That's why you want a large dia prop with a flat pitch -- it maximizes thrust, but won't affect your top speed much at all and it will really helps everywhere else.
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Post by Patch on Apr 14, 2005 9:38:00 GMT -7
12-4 it is. I think I'll break it in on my tiger 2 with an 11-6. I want to run my TT pro on the stand anyway too see where the fuel is coming out.
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Post by exrafbod on Dec 29, 2005 12:24:20 GMT -7
12x6 and to some extent 11x7 are traditionally used in the .60/61 2-stroke ranges. Open the handbook on the 46AX and go with the manufacturers listing if there is any doubt. For the Pitts you want pulling power so reduce the pitch a bit and try to keep the revs up at a reasonable rate. Try a couple of Bolly Clubman Props in the 10.5 -> 11" range to see what works best. The 46AX will take some loosening up so don't expect it to sustain flat-out vertical pulling power until about the third gallon and treat the break-in carefully.
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