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Old Oct 18, 2003, 02:32 PM
The Faster the Better
GeeBeeFan's Avatar
Michigan
Joined Mar 2003
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Question
1/4 scale Cub??

I'm looking into building a 1/4 scale Piper Super Cub, I have a really good reference...plans to build a full scale version! I would like to build it as authentic as possible but I'm running into a problem. Are there any flat four engines that look authentic and could carry a perfect scale cub? The only scale looking one I've found so far is the OS engine but I dont think its big enough to do the job. Any ideas? Thanks.
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Old Oct 18, 2003, 04:55 PM
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Mike Smart's Avatar
Aylesbury, Buckinghamshire, Great Britain (UK)
Joined Jan 2000
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Do you mean the OS engine is not big enough power wise or big enough physically to scale.
As an example an OS Gemini twin cylinder four stroke will easily fly a 1/4 scale Cub.

Mike
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Old Oct 18, 2003, 11:14 PM
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Okay I dont know what I was smokin earlier! Sorry about that, I guess I just didn't realize the exact size of this cub. Now that I've done a bit of homework, I realize that the OS four cyl. is acctually a bit big! To use the OS engine, accurately; The plane would have to be something like 1/3.85 scale, or maybe it was just a mathematical error on my part. But none the less the OS engine would look decent in the cub. I'm not positive because I can never be sure whos measuring what, where, etc... You know how it goes. So do you think the OS four cylinder has the power to pull a fully detailed 1/4 scale cub? I know its a bit of an opinion question and that I will only truly findout closer to completion.

Thanks.
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Old Oct 19, 2003, 11:09 AM
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Aylesbury, Buckinghamshire, Great Britain (UK)
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GeeBeeFan,

I don't think you would have any problem at all, unless you are going to build it out of oak
My own plan for a 1/4 scale Cub weighs in at around 12-14lbs and flys realistically on a .91 two stroke or 1.20 four stroke.

Mike
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Old Oct 19, 2003, 11:23 AM
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Stavanger, Norway
Joined Feb 2000
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A friend of mine had a 1/4 Cub (Plain Cub, not the Super) and his flew wonderfully on a OS 1.20 twin old vintage. Power of that one would be equivalent to a new .91 single 4stroke.
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Old Oct 19, 2003, 07:32 PM
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Michigan
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Okay, now that my little mathematical error has been sorted out, I only have one remaining problem....A 1,200 dollar problem! Now I just have to wait for OS to bring their price down a bit. Thanks guys.
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Old Oct 20, 2003, 07:19 AM
Mr Mootsie
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Pepperell, MA, USA
Joined Jan 2001
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I have the Sig 1/4 standard Cub with the OS FT160 twin in it. Very dependable engine which looks awesome in the cowl. It is much more engine than the plane requires, but it was well worth the expense.
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Old Oct 20, 2003, 09:42 AM
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The Netherlands
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The OS engines are beauties but expensive, how about a 2T petrol engine?
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Old Oct 20, 2003, 11:29 AM
Mr Mootsie
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Pepperell, MA, USA
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I've seen Zenoahs in Cubs, but you have to do an awful hack job to get it in the cowl.
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Old Oct 20, 2003, 05:45 PM
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I know there's always a cheaper route. If I'm going to build this thing just like the real thing is built then I've gotta have an accurate, scale engine. Unfortunately, if I'm not mistaken, the OS 4cyl is the only game in town. So if there's a cheaper 4cylinder in the appropriate size range, PLEASE let me know!

Thanks.
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Old Oct 21, 2003, 07:48 AM
Mr Mootsie
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Pepperell, MA, USA
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I believe you are correct. Saito has twins and radials.
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Old Oct 21, 2003, 08:42 AM
EDF Head
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Stavanger, Norway
Joined Feb 2000
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For a 1/4 Super Cub I'd look close on this one : http://horizon.hobbyshopnow.com/prod...prod=SAIE182TD ($670)

A plain 1/4 Cub would be perfect for this :
http://horizon.hobbyshopnow.com/prod...?prod=SAIE100T ($500)

The bigger 4cyl 3.0 OS motor you're powerwise in the 1/3 scale domain ad its way too big for a 1/4 model of this kind.
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Old Oct 21, 2003, 09:55 AM
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This 80cc twin from zenoah should do!

Rob
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Old Oct 21, 2003, 10:04 AM
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USA, TX, Trophy Club
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Yea an 80cc twin on a 1/4 scale cub. A 7.5 lb motor on a 10 lb airframe. Hmmmmmmmmm
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Old Oct 21, 2003, 09:15 PM
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Michigan
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I have no problem up scaling my idea just to go that extra step. I know I'll probably never get around to building this thing but whenever I do get around to it I want the four cylinder! Putting a two cylinder engine in a scale cub is just not something that I dont want to do, my kind of scale is a little different than most people. Thanks for the advice.
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