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Engine Opinion For 58" Extra 300

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Engine Opinion For 58" Extra 300

Old 06-23-2003, 09:02 AM
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Rev3Racer
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Default Engine Opinion For 58" Extra 300

Hi Everyone, Just looking for an informed opinion on what to power my new VectorFlight Extra 300s 58" plane. The Mfg. recommends a .60-.75 2-stroke or a .70-.90 4-stroke. One of my experienced friends says an OS FS-91SII 4-stroke will be plenty of motor and less problematic than a 2-stroke. From reading these forums, it seems like a lot of people favor a 2-stroke. I have Magic 3-D with an OS .46FX that runs fine. I've never owned a 4-stroke. I would like the plane to have very good vertical. Thanks for the help. Have a great day.
Old 06-23-2003, 03:57 PM
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majortom-RCU
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Default Engine Opinion For 58" Extra 300

When I'm eager to get a plane in the air, I choose a two-stroke, because they're easier to set up, get broken in and tuned, and require less maintenance. If I have a few planes already flying and have time available to putz around with a new model, then I like a four-stroke (especially the pumped YS and OS). If you're going to be in this hobby more than ankle deep, you have to acquaint yourself with four-strokes sooner or later. There is a definite learning curve with four-strokes beyond what you know from two-strokes. If you're ready to step up now, go for it. If you just want a plane to fly, a Tower .75 will pull your 58 inches around like gangbusters.
Old 06-24-2003, 01:03 AM
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Geistware
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Default Engine Opinion For 58" Extra 300

I have tried a ST75 and an OS91FS and I will say the plane flies good with both engines. The ST can be proped to fly faster. The OS can swing a larger propeller.
Old 06-26-2003, 12:07 AM
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Default Engine Opinion For 58" Extra 300

If a OS can swing a larger prop, then it stands to reason that with the proper prop will also fly faster than the ST. OS are very user friendly & hold their value. No question, OS over ST.
Old 06-26-2003, 12:43 AM
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Geistware
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Default Engine Opinion For 58" Extra 300

You should not run a 4 stroke as fast as a two stroke of the same size. You can try it but I can run my 2 stroke 12,000rpm. I would not run my 4 stroke that fast!
Old 06-28-2003, 06:40 PM
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Default Engine Opinion For 58" Extra 300

A 4-stroker will usually weigh a bit more than a 2-stroke.

That being said, I'd use a 2-stroke.

Your flying an aerobatic plane. Weight is a killer- especially in a smaller plane such as the one your flying.

Heavy aerobatic planes fly like a brick and they land even faster.

Get a hot 2-stroke for your aerobatic plane and leave the 4-stroke for the guys flying Kadet Seniors, where weight is not an issue.

You just can't beat the power/weight ratio of a 2-stroke.

The only 4-stroke I ever saw that had almost the same power as a 2 stroke was the Saito 180. I used to run big ST engines. The ST3000 is a 1.8 engine and it weighed about 4 ounces more than a Saito 1.8 Both engines used a ton of glow fuel, but the ST would swing a bigger prop. Most guys will use an 18-6 or an 18-8 prop on a Saito 180. My ST3000 would swing an 18-10 at more RPM than the Saito with the 18-6. I would sometimes use a 19-8 prop on it. I even used a 20-6 prop on my ST3000 for awhile. That prop was spinning about 7000-7300RPM. You won't find any Saito 180 running a 20-6 prop at those RPMs.

Go with the 2-stroke.
Old 06-28-2003, 07:11 PM
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Rev3Racer
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Default Engine Opinion For 58" Extra 300

Hi Guys,
Thanks for the help. I ended up ordering an OS .91FX. I think it should do the trick. Have a great day.
Old 06-28-2003, 10:39 PM
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Geistware
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Default Engine Opinion For 58" Extra 300

I will agree that the 2 stroke will be the better of the two.
Old 06-29-2003, 04:47 AM
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David Cutler
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Default Engine Opinion For 58" Extra 300

Originally posted by Rev3Racer
Hi Guys,
Thanks for the help. I ended up ordering an OS .91FX. I think it should do the trick. Have a great day.

That's what I'm putting in my Vector 300 Extra 58"

Tell us how you get on please!

-David C.
Old 06-29-2003, 11:20 AM
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Geistware
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Default Engine Opinion For 58" Extra 300

I have a 58" Extra with a ST75 on it.
You will have a LOT of fun with a 91FX!

Originally posted by David Cutler
That's what I'm putting in my Vector 300 Extra 58"

Tell us how you get on please!

-David C.
Old 11-09-2004, 09:42 AM
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Default RE: Engine Opinion For 58" Extra 300

I have a Saito FA-80. Do you think the VF Extra 300 58" will be underpowered with this engine?

Kurt
Old 11-09-2004, 03:40 PM
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Mudsurfer1234
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Default RE: Engine Opinion For 58" Extra 300

i have the Great Planes Extra 300, with a 50SX and is VERY well powered. if they want such a big engine on the same size plane, must be heavier, meaning easier tip stalls.

my extra is also 58 inch wing

Scott

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