RCU Forums - choosing a 2 stroke/4 stroke

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RE: choosing a 2 stroke/4 stroke

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ORIGINAL: SushiSeeker

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ORIGINAL: DenverJayhawk

I know lots of people say don't over power your model, but having done it, I can honestly say it's the most fun you can have legally.

I respectfully disagree. There is more to overpowering a model than just adding a bigger engine. The bigger engine throws a bigger prop and needs more ground clearance. Also you have to add a larger fuel tank as the larger engine will consume more fuel than a smaller engine generating the same thrust. I've done this, too but you are inviting catastrophic failure. My U-Can-Do 40 has an OS .65 because I read similar comments and as a result the plane is waaaaay over powered. She will accelerate in a vertical climb and outfly the large control surfaces causing significant flutter.

To the topic of this post, everyone has their favorite engine as do I and few people have bad things to say regarding OS Max. When my son steps out of his trainer, we will likely go with a Big Stick 40 with an OS .72 4-stroke which has the same HP rating as an OS .46.

I agree with the bigger prop issue but it is easily resolved by adding larger diameter wheels or longer landing gear. If the prop is properly balanced , you shouldn't have that much flutter. I also am using the stock fuel tank with the kit and I'm still able to get 15 min flights. I'd bet it could go even longer, but I generally set up landing at the 12-14 min mark.

These are small prices to pay for the added benefit of power.

RE: choosing a 2 stroke/4 stroke

Quote:

ORIGINAL: NM2K

The Tower Hobbies .46 and the Super Tigre GS-40 are about the same size and weight. Power wise, I doubt that there is much difference. The ST GS-40 is a pretty hot engine after a rich break-in of several tanks of fuel. Both are great engines and both will pull your Cub around at more than scale speed, so don't be afraid to throttle back a bit. Your flight will last longer and you won't be beating up your model as much with the increased aerodynamic pressure that full throttle operation imparts.

Ed Cregger

Actually there is quite a bit of difference.

The GS-40 is fine, but it is not the stump puller that the TH .46 is.

RE: choosing a 2 stroke/4 stroke

think i will go for a four stroke for my ugly stik .40 - .60 - just need to decide .70 .52 or maybe saito .65 - any thoughts?

RE: choosing a 2 stroke/4 stroke

will an OS70 be too powerfull?

RE: choosing a 2 stroke/4 stroke

saito .72 would be about right;)
once you go 4stroke, ya never go back.....
well almost never;)
have a ST 90 on a Seagull .75 extra that i love burning holes in the sky with
no 3D just a little light aerobatics...and such;)

RE: choosing a 2 stroke/4 stroke

Quote:

ORIGINAL: scottm50

think i will go for a four stroke for my ugly stik .40 - .60 - just need to decide .70 .52 or maybe saito .65 - any thoughts?

Saito .65 is a very old engine. I see quite a few of them come up for sale - so not hard to find, however I suspect a newer engine will probably run better for you. I have a Saito .65 I run in a Great Planes cub on floats at 5,600 MSL. I love my .65, but it can't always get that cub off the water.

RE: choosing a 2 stroke/4 stroke

I wouldnt leave the Magnum 4 strokes of this deal. ;)

RE: choosing a 2 stroke/4 stroke

The Magnums work great. And they are priced much more reasonably than other brands. Personally I cannot justify paying OS prices when I get great performance from Magum for 100 to 150 less for a .72 to .91 size 4 stroke.

RE: choosing a 2 stroke/4 stroke

I have a Magnum .52 coming out of a LT-40 and going into a Four Star 40 that I'm building now. I also have a Saito 100 that I'm currently flying with in my Four Star 60. I mean a Saito is a Saito, but I prefer the Magnum over the Saito for 3 reasons.

1: The price.
2: It sips fuel.
3: It's clean.

I like Saitos over Magnums because I think they sound better, look better and have a better mid range.

RE: choosing a 2 stroke/4 stroke

All I can say is don't get an MDS. I have an MDS .48 2-stroke in my Ultra Stick and have nothing but trouble with it.