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Need a bigger twin...

Old 06-10-2013, 08:13 AM
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Default Need a bigger twin...

I have a 1/4 Scale J3 Cub that I powered with a Saito 100T. The engine is new and runs strong, but the 14 lb bird is scary to fly. Seems a little too "scale". All jokes aside, the plane looks good, but is underpowered for me. I would like to stay with a twin and increase the power at least 20%. I thought about maybe a Saito 130T. What do you guys think? Any other suggestions?

Thanks,

David
Old 06-10-2013, 08:18 AM
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Default RE: Need a bigger twin...

SC 160FS ?????????????????????
Old 06-10-2013, 09:19 AM
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Default RE: Need a bigger twin...

I suspect the problem is made worse with the small prop that would have compared to scale.  Have you tried a larger lower pitched prop?  J-3 cubs don't fly fast and models can fly very slow.
Old 06-10-2013, 09:32 AM
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Default RE: Need a bigger twin...

I would go with a Saito 182 Twin, that should do the trick.
Old 06-10-2013, 09:58 AM
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Default RE: Need a bigger twin...

Thanks cymaz, I appreciate the reply. Don't know what the SC 160FS is... (160 four stoke I get. Who is SC?)
Old 06-10-2013, 10:01 AM
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Default RE: Need a bigger twin...

Thanks, Sport_Pilot. I did try a larger prop. Lost RPM with the Saito four stroke. Pretty sure I need more power.
Old 06-10-2013, 10:06 AM
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Default RE: Need a bigger twin...

Thanks earlwb,

That would probably give me unlimited verticle, too

Maybe a little too much? Does OS make something in-between? If I get something just incrementally smaller, we MIGHT not have to buy a new cowl....
Old 06-10-2013, 10:07 AM
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Default RE: Need a bigger twin...

Super Custom Engines. [link=http://www.marionvillemodels.com/rc-shop/sc-engine-160fs-four-stroke-flat-twin-aero-ringed-engine-for-nitro-powered-model-planes_4480660.html]Super Custom[/link]Here
Old 06-10-2013, 10:22 AM
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Default RE: Need a bigger twin...

David,

The OS 1.60 Twin is a perfect match for 1/4 scale cubs. More power than you need for scale but not grossly overpowered.
Old 06-10-2013, 11:06 AM
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Default RE: Need a bigger twin...

There are also copies of the OS 1.60 twin, ASP and MAgnum both make one.
The Saito 1.82 twin would still work, remember you do have a throttle too, you don't have to fly full throttle.
If I remember right, Saito did make some smaller displacement versions of the 1.82 twin, but they keep boring it out to give it more power.
Old 06-10-2013, 11:15 AM
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Default RE: Need a bigger twin...

Saito made a 130T. They can still be found.
Old 06-10-2013, 11:38 AM
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Default RE: Need a bigger twin...

ASP with a private label. Same ASP from Hobbyking $360.00 USD
Old 06-10-2013, 02:59 PM
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Default RE: Need a bigger twin...

What I would try first is to run 35% nitro thru it. This will likely give you your 20% gain in power. you should be able to go up on or two inches in prop size. Now I kow you and other will say 35% is expensive but you need to look at overall cost in the long run. you can figure that 35% nitro will cost you about 15 more dollas a gallon. now if you only burn 10 gallons thru it a year thats just 150-175 dollars extra a year. Now a new Saito, OS or magnum twin will run you atleast 600 dollars. that will be around 4 years flying on the Saito 100 you have just with running more nitro.

My figures are based on that you are already running 15% nitro. Saitos love nitro. Run 15% fuel thru them and they are weak engines. Now throw some nitro at them and they are now strong engines. Just thinking out of the box some. plus this would be easy for you to do instead of adding a new engine and getting it set up on the front of the plane.
Old 06-10-2013, 03:49 PM
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Default RE: Need a bigger twin...

i had a magnum 160 in my cub for years until i lost the plane it was a 1/4 world model ship had plenty of power
Old 06-10-2013, 04:35 PM
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Default RE: Need a bigger twin...

I believe SC ASP and Magnum are all from the same company, Sanye.  So whichever one is the cheapest/best warranted would be my choice for that model if you wish that one.
Old 06-10-2013, 04:38 PM
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Default RE: Need a bigger twin...


ORIGINAL: Sport_Pilot

I suspect the problem is made worse with the small prop that would have compared to scale. Have you tried a larger lower pitched prop? J-3 cubs don't fly fast and models can fly very slow.
a stock full size 65 hp cub was only about a 70 mph airplane. where ever you went you always hoped the wind didnt turn around and blow hard for your return flight,,,,hehe
Old 06-10-2013, 09:31 PM
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Default RE: Need a bigger twin...


ORIGINAL: fred985


ORIGINAL: Sport_Pilot

I suspect the problem is made worse with the small prop that would have compared to scale. Have you tried a larger lower pitched prop? J-3 cubs don't fly fast and models can fly very slow.
a stock full size 65 hp cub was only about a 70 mph airplane. where ever you went you always hoped the wind didnt turn around and blow hard for your return flight,,,,hehe

New cubs have 230 HP..
Old 06-10-2013, 09:50 PM
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Default RE: Need a bigger twin...

I have a OS 120 Twin on mine with a Master Airscrew 16-6 prop. Flys pretty good but requires rudder input to turn unless its going full bore. I have the rudder and ailerons coupled in the transmitter.
Old 06-11-2013, 02:55 AM
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Default RE: Need a bigger twin...

G'day

The OS 160 Gemini is great in a quarter scale Cub. I have a 1/5 to 1/6 scale Cub with a Saito 90FS (boxer) in it and it is a good match. I suspect your 100 is about as powerful as my 90FS.

I have an OS 160 Gemini twin and I was going to put it in a 1/4 scale Sig Clipped Wing Cub which I am slowly building but at the moment it is in a Giant Sportster. A friend has the same setup and it works really well. The OS 160 is a really smooth handling easy to run engine. I fueled mine, primed it, turned it over and it fired so I gave it a prod with my hand and it started. Brilliant engine.

The Sanye company in China makes the ASP (their own brand) and Magnum copies of the OS 160. They are about 1/3 the price but they do seem to run well. You can get them from Hobby King for a very reasonable price.

Cheers

Mike in Oz

Old 06-11-2013, 04:11 AM
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Default RE: Need a bigger twin...

I think mike is on the right track there.I prefer the saito 182 which i have,naturallybut have a lot of experience with asp 160's since that time.they sound better than the 182 and are very solidly built
Old 06-11-2013, 04:12 AM
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Default RE: Need a bigger twin...

35% nitro fuel costs $15 more than 15%? If you mix your own it should cost only $8 more with nitro at about $40 a gallon, at $50 it is $10 more.
Old 06-11-2013, 04:14 AM
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Default RE: Need a bigger twin...


ORIGINAL: airraptor


ORIGINAL: fred985


ORIGINAL: Sport_Pilot

I suspect the problem is made worse with the small prop that would have compared to scale. Have you tried a larger lower pitched prop? J-3 cubs don't fly fast and models can fly very slow.
a stock full size 65 hp cub was only about a 70 mph airplane. where ever you went you always hoped the wind didnt turn around and blow hard for your return flight,,,,hehe

New cubs have 230 HP..
That was the SuperCub, not the J-3. Do they still make the SuperCub?
Old 06-11-2013, 04:14 AM
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Default RE: Need a bigger twin...

Here is a link to a 1.82, I couldn't find a 1.30 for you, the 1.30 would be perfect. I'll check and see if the guy has good ratings.

http://www.rcuniverse.com/market/item.cfm?itemId=921495

He has 100% good ratings.
Old 06-11-2013, 04:28 AM
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Default RE: Need a bigger twin...

And, here is a 1.30

http://www.rcgroups.com/forums/showt...ighlight=saito
Old 06-11-2013, 04:43 AM
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Default RE: Need a bigger twin...

Of course it requires rudder. It's called a coordinated turn!

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