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Old Apr 13, 2012, 02:18 AM
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.46 OS AX 1/6 Clipped Wing Cub

Hello, This summer I will be building an Sig 1/6 scale clipped wing cub. I can get a hold of an OS AX .46 engine and was wondering if that would be too much for it? I know the clipped wing cub is supposed to be slightly more aerobatic so I was thinking this engine might be ok but I don't really know. The kit specifies a .25 to .40 engine. My question is would the .46 be too much power? I don't know a whole lot about this engine either so any input is greatly appreciated. I also am not too sure as to how well it would fit in the cowling of the Sig kit with its larger size.

-Greg
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Old Apr 13, 2012, 11:35 AM
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I think that combo would work fine. The H9 cub calls for a like a 36 to a 40 and I have a .91 four stroke in mine and it flys great. The only thing worse then an overpowered plane is an underpowered plane.
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Old Apr 13, 2012, 07:09 PM
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Wichita, Kansas
Joined Dec 2005
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The .46AX will be way too much power for it, and too heavy. You'll be better off with a .40 FP or LA, or the maximum a .46 LA. You need to keep in mind this plane was originally designed in the 1950's by Chuck Hollinger as a 1 to 3 channel model, and will weigh about 3-1/2 to 4-1/2 lbs. when finished.

I've had a couple of these and found they fly really good on an OS .35/.40 FP. It'll be aerobatic, but likes to be flown in a scale like manner on the wing. If you over power it, you'll tear it apart in the air (I learned that the hard way). I currently have the wings for the 1/6 scale standard Cub built, and will either use electric power, or something along the lines of an OS .30 4-stroke.

If you want to fly hard-core aerobatics with one, you need to look at different Cub with a stronger structure. Also the Sig 1/6 Cubs like to be propped for climb, not for speed.

Hogflyer
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Old Apr 14, 2012, 09:36 AM
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I guess hogflyer has a point about tearing it appart. There was a guy that had a Tower Trainer at our club that folded the wings in mid-air because he was going too fast. You don't want that to happen to a plane that you put hours of build time into.
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Old Apr 14, 2012, 03:03 PM
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Well maybe I should look into selling the .46 os then. I really would like to get a four stroke but they are a bit out of my price range. I will also look into a .40 two stroke or something like that. I still have a lot of time though.
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Old Apr 14, 2012, 06:47 PM
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you'd be hard pressed ta tear apart a properly built sig kit!

the clipped wing cub is a sport plane capable of some great arobatics!

that 46 will be fine! as long as your not building it ta use as a trainer! a great secound plane yes!
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Old Apr 14, 2012, 10:32 PM
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Quote:
Originally Posted by whiskykid View Post
you'd be hard pressed ta tear apart a properly built sig kit!

the clipped wing cub is a sport plane capable of some great arobatics!

that 46 will be fine! as long as your not building it ta use as a trainer! a great secound plane yes!
That's kind of what I was thinking/ hoping. Can anyone confirm or agree with this? It seems there are two conflicting ideas about it right now. I do plan on building it strongly with some possible reinforcements.
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Old Apr 14, 2012, 10:39 PM
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I built one years ago and powered it with a K&B 40. It was overpowered with a 10X6 prop, meaning it didn't look/fly like a cub. Cruise at 1/3 throttle, and then giving full throttle, the plane would "jerk" from the engine torque. My field adjustment (I didn't have any more suitable props at the time) was to install the prop backwards, grossly reducing its efficiency. That made a world of difference (better) and later I switched out to a 10X5 or 10X4 and the plane flew fine.

That K&B 40 is not nearly as strong as the OS 46AX.

SIG's 1/6 cub is a very old design, basically a stick and tissue model modified for glow power. It's a very light build and flies well. You can certainly overpower it, there's no law against it, but the model deserves better treatment and presentation, in my view.

Enjoy it!
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Old Apr 14, 2012, 10:47 PM
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I flew mine with a Fox .36R/C. Enough power for flying in the wind--and when is there no wind in Wichita, Kansas? Don't remember what the Fox weighed, but I would think if the .46 is heavy enough you could locate the radio system farther aft for balancing. Then you could install an interior to hide the R/C system, if you so desired.

My Cub was very easy to fly, straightforward on handling, even at slow speed. I'm sorry I sold it, but I still have one in the kitbox stored. It flew mucho better if I coordinated rudder with aileron, and you could do that now-a-days with the radio. Can't beat how good it looks floating along on a "high speed flyby" That usually doesn't take more'n five minutes
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Old Apr 14, 2012, 10:53 PM
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ok well I will probably try to get a hold of a slightly smaller engine in the next few months (hopefully a 4 stroke as I love the sound) and save this one for a different plane. I do want it to fly relatively scale without being underpowered but I am not trying to overpower it at all it does deserve better than that haha. Thanks for the input!

-Greg
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Old Apr 15, 2012, 12:39 AM
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USA, IL, Benton
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I think the 46 would be fine. I flew one for several years with a Saito 56. Definitely not overpowered but would do all the Cub aerobatics real well. To do it again I would use a 72 Saito. I never used the wing struts either. I sold it to a friend and still get to fly it once in a while.
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Old Apr 15, 2012, 10:00 AM
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what alot of peeps don;t remember or know is the 45 and 46 size engines came from 1 upmanship from the engine manufacturers, when 40 size airplanes where the rage in the 80's!

ok so when the only way ta make more power out of a 40 size engine was ta make it a 46! most companys didn't even make a 40 after that!

besides, man(and woman) have ben putting bigger engines in things for along time! its just normal! hehehe,
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Old Apr 15, 2012, 12:06 PM
Balsadustus Producerus
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And you don't have to fly it at full throttle, either. Well, maybe for the vertical rolls...
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Old Apr 15, 2012, 12:10 PM
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Well I sold the .46 to a buddy who will use it. I just didnt want to risk destroying it on its first flight or something and another thing was the muffler that came with the .46 is huge! I think it would look pretty unnatural hanging out of the narrow cub cowling. I am going to save up and buy a 4 stroke hopefully, any recommendations?
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Old Apr 15, 2012, 12:30 PM
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if your pinchin pennys(and who ain't) the asp are proven engines!

http://www.hobbypartz.com/72p-fs52ar.html

if broke in right should become a reliable engine and give ya that kewl 4 stroke sound and power!
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