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Old 07-31-2009, 03:19 PM   #11
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Re: 4-Stroke Pumped/ Non Pumped

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I've got a FuntanaS40 with a Saito 72.
Very similar to your setup.

I've had some fuel spewing issues with the Saito and haven't run it since I added a velocity stack, and an o-ring came out of the head where the carb is attached. Otherwise it ran quite well.

I wiped the landing gear off many times, and once snapped the whole firewall/engine/fuel tank out. Check for weak seams.

Awesome plane, goes where you point it and can roll three times per second on 3D rates.

One more thing: peel off the Italian flag and replace with Canadian
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Old 07-31-2009, 03:19 PM   #12
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Re: 4-Stroke Pumped/ Non Pumped

From my experience Reo and Max have hit the nail on the head. The plane you see in my avitar is powered by a Series 11, O.S. - 120 - 4 stroke with a pump. I know the engine is an older model but it does not have that much time on it. I have been flying this plane with this engine for almost 8 years. (10 to 30 flights a year) The engine starts and idles beautifully, it transitions great, I have never had a flame out but IT IS A TOTAL PAIN IN THE ASS. Please don't get me started! If you could look under my hat you would not see any hair. If a pumped engine is not specifically recommended - say away from them. . . always remember the KISS principle. . . Cheers
Ancaster Sport Flyer... "your attitude affects your altitude!"
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Old 08-05-2009, 06:02 AM   #13
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Re: 4-Stroke Pumped/ Non Pumped

The pumps work equally well on 2 and 4 strokes. Mostly made for the high performance goodies because of the fact that you can put a bigger carb on it for more power. Some other advantages, you can put the tank on the CG so there is no CG shift as the tank empties, the fuel mixture stays the same from a full tank to empty. Downside, diaphrams have to be changed on a regular basis, Picky to get the carb, fuel pump settings synchronized, hog on fuel at high throttle settings, higher maintainance, one other thing to go wrong.
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Old 08-08-2009, 10:11 PM   #14
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Re: 4-Stroke Pumped/ Non Pumped

Well... Greg came down today and we fired the old OS .70FL up and she ran fantastic... without a pump. She started right away but was running way to rich, so after some needle tweaking, she held a steady, smooth idle and has surprisingly good power. She hauls the Funtana 40 around just fine. You will like this combo for sure Greg.


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Old 08-08-2009, 11:18 PM   #15
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Re: 4-Stroke Pumped/ Non Pumped

Yeah, you're right Curt. It actually exceeded my expectations. With all the mixed reviews on the engine, I was beginning to have doubts as to the engines performance, but it pulls that Funtana around with ease. While not a 3D performance engine, it will serve its purpose and support my kind of leisurely flying. Thanks for the help setting things up!!

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