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What engine size?
What size 2 stroke engine would you use for a 6.5-7.5 lb 3D profile?
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RE: What engine size?
OS 120AX
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RE: What engine size?
Yeah, that's what I've got and was planning to use in the Aeroworks Pro260 I just got but it won't fit without hogging out the wood where the engine goes. The manual suggests an OS 75 AX, I don't have one though and don't want to have to buy one.
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RE: What engine size?
A 75 AX might not even be enough to hover.
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RE: What engine size?
Dremel it out and put the 120AX on there. It has 1000 squares of wing area and with that engine at that weight it could actually fly pretty well. I'm thinking the "40 sized" will need the 75.......</p> |
RE: What engine size?
Bummer is, the 75AX is only an oz. lighter than a 120AX.
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RE: What engine size?
Oh, Ok. I'm glad you guys know what you're doing. :) I'll start hogging it out tomorrow. Thanks
I have an APC 17x4W prop for it. Will that work? |
RE: What engine size?
ORIGINAL: ThumbSkull Bummer is, the 75AX is only an oz. lighter than a 120AX. I own both motors and its weird they're so close in weight. The 120 is physically much bigger than the 75. I was quite disappointed with the 75 when I first got it. But it runs well and has good power for what it is, a 60 sized engine. Sad thing is the 91fx weighs about the same and has much more power. Anyway, since I have it I've used it on a couple of planes and its fine for what it is.. I have the 61 fx also, which weighs close to the same as the 75 but the 75 is significantly stronger. If I had it to do over I'd buy the 95 AX, but since i paid for it I'll use the 75. Anyway, back to the OP, I use a 17-6 sport apc on my 120AX. Good prop for the motor. |
RE: What engine size?
I've owned both these engines and had them on my scale. If you leave the extension off the 120AX (.91oz.) the weights are 1.2oz apart with the stock exhaust. The bare engines (no muffler involved) the weights are only .7oz apart. The bare 91FX is lighter than both.
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RE: What engine size?
that's depressing....
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RE: What engine size?
ORIGINAL: Dave45 ORIGINAL: ThumbSkull Bummer is, the 75AX is only an oz. lighter than a 120AX. I own both motors and its weird they're so close in weight. The 120 is physically much bigger than the 75. I was quite disappointed with the 75 when I first got it. But it runs well and has good power for what it is, a 60 sized engine. Sad thing is the 91fx weighs about the same and has much more power. Anyway, since I have it I've used it on a couple of planes and its fine for what it is.. I have the 61 fx also, which weighs close to the same as the 75 but the 75 is significantly stronger. If I had it to do over I'd buy the 95 AX, but since i paid for it I'll use the 75. Anyway, back to the OP, I use a 17-6 sport apc on my 120AX. Good prop for the motor. |
RE: What engine size?
I have a 17x6 APC on my 1.20 AX also. I have not tried the 17x4W but the 17x6 is pretty good. These 1.20s don't turn a lot of RPM so I am not sure the 4" pitch will do what you want.
david |
RE: What engine size?
how about a 95AX? I have one in a Big Stik 60 and it runs great. Though a 16" and larger prop is way too big.
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RE: What engine size?
ORIGINAL: DenverJayhawk how about a 95AX? I have one in a Big Stik 60 and it runs great. Though a 16" and larger prop is way too big. |
RE: What engine size?
+1 On the OS 120AX with a 17X6 prop. Pull around my YAK 65 just fine.
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RE: What engine size?
im trying to decide which of the two 95ax or 120ax to put in this plane (aw 260) if i go with the 120ax should i not hang it all the way to the end of the engine mount like it states in the manuel ,and just leave it back i little further to prevent it from being too nose heavy?
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RE: What engine size?
Don't just mount it where the instructions say to.
Mount the engine very last after servos, RX, and battery, using the engine (with prop and hardware and muffler) to set the rough CG to the midpoint where the instructions say the CG should be. Then you can use the RX battery to fine tune the CG position. With only one ounce of difference I'd go with the 120AX. |
RE: What engine size?
I dremeled out the rail area (only took a little bit of wood removal) and mounted a 120 AX in there. It ended up being about the middle of the mount area, for convienience and it worked out fine for the CG. The battery ended up being in the traling edge of the wing. It's a good idea though to mount it last and be able to move it around some.
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