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Old 12-02-2011, 04:07 PM   #1
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Cool Engine comparisons.

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I'm new just getting into RC flying.
Engine size comparison seems mysterious to me. It appears air frames are rated as the size of nitro 2 stroke cu. in. engine it takes. (eg: an LT-40 takes a .40 cu. in. nitro engine). Is there a chart available giving the equivalent nitro 4 stroke, gas 2 stroke, gas 4 stroke or electric motors?
Also how reliable are the new small <20 cc gas engines?

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Old 12-02-2011, 04:11 PM   #2
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Re: Engine comparisons.

For the more common engines, these are usually the equivalent 4 strokes:

45 2str = 70 FS
60 2Str = 90 FS

Generally, the 4 stroke displacement needs to be about 25-30% more (more or less..LOL)
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Old 12-02-2011, 05:26 PM   #3
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Re: Engine comparisons.

Hey Rossco,

I started the hobby about a year ago, and had the same question as you. What helped me get a rough idea was the different sites that sells kits. Usually under the specs they will list engine requirements, both 2 and 4 stroke equivalent. Also alot of times you get dimensions and flying weight. Helped me out a great deal.... Here is an example from Great Hobbies site..

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Old 12-03-2011, 09:15 PM   #4
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Re: Engine comparisons.

Elecric motor sizing is still a bit of a mystery to me as every manufacturer seems to have their own system!

I have resorted to looking for a watt rating on the motor & 746 watts = 1 horse power. Most .40's now days are just over 1 hp.

I put an Eflight .25 on my .25 sized plane & just about tore the tail feathers off of it! Vertical unlimited, enought to hover at 2/3 throttle way more power than any .25 glow engine I have ever seen!

Hope that helps.
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Old 12-04-2011, 02:58 PM   #5
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Re: Engine comparisons.

the new 20cc have just a lil more power then a 120 four stroke
and they run great !
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Old 12-05-2011, 05:18 PM   #6
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Re: Engine comparisons.

Rossco, Welcome to R/C Canada, and this great hobbie.

There is several different comparison charts out there. A lot will depend on the flight envelope the airframe is intended for. I imagine you question is based more towards trainers, sport / intermediate aircraft.

I attend many fun-fly events each year, and have done for many years. 2 Stroke, and 4 Stroke seam to work best up to 6-8lbs. Gas seams to work best 20cc (1.2cid) and larger. All the gassers I have seen smaller than 20cc, are disappointing.

Hope this might help.
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