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Help! 4 stroke equivalent question

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Nick Williams01/09/2012 10:03:16
71 forum posts
34 photos

Hi all, After a 4yr break from model rc (not by choice) I'm looking at gettin airborne once more. I'm currently looking at the seagull swift 40 plane but I'm wanting to fit a 4stroke motor instead of a 2. The manufacturer recommends a .46 2 stroke so I'm guesstimating I'm going to require something around the .56-.60 size? Hope someone can help and i welcome any input, thanks in advance


JC01/09/2012 13:18:07
283 forum posts
53 photos

Hi Nick

An SC 52 four stroke should fly the model well and will be nicer to fly that a 2 stroke. I use this engine in my Black Horse travel Air and it flies very well. It should have just the right amount of power for the Swift. Not too much and not too little. Just my humble opinion.


Phil 901/09/2012 13:27:54
4287 forum posts
246 photos

Me I would go for a 56 smiley

JC01/09/2012 13:32:35
283 forum posts
53 photos

The only 56 four stroke I have seen is by OS and cost more than three times the cost of the model. but if you have the money it should be an OS every time.

Concorde Speedbird01/09/2012 13:45:29
2721 forum posts
632 photos

Saito do a 56, brilliant enginesyes On par with OS in price and quality, Lasers rule though! (BRITISH!)

But an SC 52 will be fine for the Swift though, and a lot cheaper than OS and Saito and Laser's smallest engine is a 70, too big.


Nick Williams01/09/2012 15:08:05
71 forum posts
34 photos

Thanks JC, the SC does seem best considerin its a trainer. No doubt an OS will find its way into whatever plane I move on to! Thanks

Concorde, the Laser engines are very nice and I like their slogan 'designed by modellers, built by engineers' but as you say, to big

Thanks for the replys.

Mark Powell 201/09/2012 15:38:14
430 forum posts

For a four stroke I go for 50 percent bigger than a two stroke, as a rough rule of thumb. OS every time, other than below. Though as far as I have have seen, OS 'superiority' is not by much.

The 'CD' RCV engines are good, and cowling is easy, on a Spitfire and the like, as they are not as tall as the rest. Sound a bit rattly at tickover. Don't bother with the 'longitudinal' ones.

Bob Cotsford01/09/2012 16:47:36
8152 forum posts
449 photos

If my RCV91CD is anything to go by, the 58 would be a good choice. If youi want to keep the costs down an SC52 4 stroke pulls my Acrowot around ok.

Alan Cantwell01/09/2012 17:10:22
3039 forum posts

what stage where you at when you left the hobby? i would hate to see a 4stroke get rolled in a ball in a trainer, they do suffer mishaps, what type to get? OS will last years longer, their build and metalurgy is far superiour to the chinese copies, but seeing as the average engine does not stay in the hands of the buyer for long, then go with one of the clones,

Nick Williams01/09/2012 17:29:24
71 forum posts
34 photos

Admittedly I was still quite novice Alan, I manage 4-5 solos comfortably but never really stuck at it due to family commitments. This time around it will be different. I'm currently spending most of my free time on the sim, but to be fair I'm itching to get airborne again!

GrahamC01/09/2012 18:25:18
1237 forum posts
196 photos

The alternative to the SC52 might be the ASP 61 which is physically the same size as an SC52, indeed many of the parts will be interchangeable. It should be lighter, being a bored out version of effectively the same engine. It will have just a little more power, and they tend to be sweet, and long lasting. My son has one in a Black Horse Renegade, and it's a nice combination.

Steve Hargreaves - Moderator07/09/2012 16:23:57
6731 forum posts
191 photos

I was going to suggest the ASP61 for all the points made by Graham......turns a 12x6 very nicely & drags my Pitts Spesh around with gusto....thumbs up

Chris Channon11/09/2012 18:07:16
546 forum posts

Saito .56, it will last forever and the build quality is brilliant, i have OS engines and the Saito's are miles better.


Chris C

Alan Cantwell11/09/2012 18:52:04
3039 forum posts

why are Saitos better than O.S.? i too have both, the finicky ones are the Saitos, but not by much, the metalurgy in both is top drawer, the build quailty and machinng is above top notch on both makes, i cannot call it for one better than the other, and while we are on fourstrokes, dont forget Enya, now they do last forever, just last week, i stripped and changed the bearings in one for a mate, de-gummed it, reassembled, set it, and it was away first flick , like it had just come out the shop, the thing had not run for 20 years,

Concorde Speedbird11/09/2012 19:14:11
2721 forum posts
632 photos

A Saito or an OS run brilliantly, but Saito's look nicer in my opinion...

Saito FA62A


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