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Where are the 50cc engines?

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Chris Berry02/11/2019 16:38:54
228 forum posts
1 photos

A clubmate rang me today asking for my thoughts on what engine he should put in a new plane he's getting. He wants to put a 40cc FS petrol engine in the model and asked me which one i'd recommend.

That got me thinking and searching the internet. There don't seem to be many 40-60cc single cylinder FS petrol engines about. A 50cc FS single would go down a storm I reckon but we're pretty much stuck with 2S engines.

Am I alone in thinking that we need a decent 50cc single cylinder four stroke petrol engine to be released?

iqon02/11/2019 16:59:43
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1468 forum posts
239 photos

Just engines - NGH GF 38 four stroke

Peter Christy02/11/2019 16:59:49
1615 forum posts

More to the point for many of us, where are the engines under .40ci (6.55cc)?

For decades, engines in the .15 to .40ci (2.5cc to 6.5cc) were the cornerstone of club flying! Nowadays, aside from classified ads and ebay, these engines are just about extinct! PAW still produce diesels in this class, but where are the glows? How are people meant to learn how to master ic engines without the "beginners / club" size motors?

Or am I just being a sad old - er - person? indecision

--

Pete

Gary Manuel02/11/2019 17:08:07
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1976 forum posts
1514 photos

If it's a quality 40cc FS Petrol he's after, look no further than Saito FG-40. Not cheap, but quality seldom is. I have an NGH GF 38, which has plenty of character but not exactly oozing with quality.

If he wants a bit more power, your into twins like the FG-57TS or FG-61TS

Jason-I02/11/2019 17:09:58
268 forum posts
37 photos
Posted by Peter Christy on 02/11/2019 16:59:49:

More to the point for many of us, where are the engines under .40ci (6.55cc)?

For decades, engines in the .15 to .40ci (2.5cc to 6.5cc) were the cornerstone of club flying! Nowadays, aside from classified ads and ebay, these engines are just about extinct! PAW still produce diesels in this class, but where are the glows? How are people meant to learn how to master ic engines without the "beginners / club" size motors?

Or am I just being a sad old - er - person? indecision

--

Pete

OS still sell a 0.15, a 0.35 and a 0.46.....

Gary Manuel02/11/2019 17:15:07
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1976 forum posts
1514 photos

Not seen one, but OS GF40 must be worth considering.

cymaz02/11/2019 17:43:03
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8803 forum posts
1194 photos

Here’s one

Chris Berry02/11/2019 17:47:36
228 forum posts
1 photos

Shame the likes of OS and Saito don't make a 50cc single

dave parnham02/11/2019 19:05:49
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168 forum posts
11 photos

Valach Motors do a lovely 60cc 4st heart

Frank Skilbeck02/11/2019 19:31:04
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4514 forum posts
101 photos

Kolm do a 50cc single

Gary Manuel02/11/2019 21:28:56
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1976 forum posts
1514 photos

The problem with a 50cc Four Stroke engine would be that it would not have the power of a 50cc two stroke and would struggle with an airframe designed for 50cc models. For this popular size of model, you would probably need about a 70cc minimum four stroke (twin?).

I see the 38cc / 40cc FS as being suitable for a 30cc airframe, which is hopefully what your friend is looking for.

Weight is always going to be an issue with 4 stroke engines.

Frank Skilbeck03/11/2019 08:25:16
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4514 forum posts
101 photos

Yep an OS GF40 weighs 1.4kg and a DLE 30cc 1.1kg, but by the time you've added a decent silencer to the DLE it will be a lot closer.

Peter Christy03/11/2019 09:34:01
1615 forum posts
Posted by Jason-I on 02/11/2019 17:09:58:

OS still sell a 0.15, a 0.35 and a 0.46.....

Perhaps I should have said affordable sub-.40 size engines! Over £100 for a .15? Really? And has anyone (other than Just Engines) actually got any in stock?

Even in Japan, that 15 is over £70! So I say again, where are the small affordable engines?

--

Pete

Jason Channing03/11/2019 09:36:51
96 forum posts

I have a NGH GF 38 and I paid £1 for it as spares from hobbyking end of year sale.and the best use of it is as a training tool and a Paper weight, (although thats discriminating against paper weights) Quality is not a word I would use.

ken anderson.03/11/2019 09:46:18
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8473 forum posts
773 photos

during the 90's I modified the engine from a McCullough strimmer,it was about 30 cc,I think.the article appeared in a LMA mag.Mrs A couldn't understand why we went on a trip to B/Q to buy a strimmer when we didn't have a garden.....

ken anderson....ne....1...B/Q dept.

Rich too03/11/2019 16:13:05
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3053 forum posts
1070 photos
Posted by Frank Skilbeck on 02/11/2019 19:31:04:

Kolm do a 50cc single

Lovely engineering but ridiculous prices.

Tom Sharp 204/11/2019 01:28:22
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3572 forum posts
19 photos

My 40cc petrol Saito with my first ever engine Mills .75 around 1950.

saito.jpg

Robin Colbourne04/11/2019 16:34:32
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443 forum posts
6 photos
Posted by Peter Christy on 03/11/2019 09:34:01:
Posted by Jason-I on 02/11/2019 17:09:58:

OS still sell a 0.15, a 0.35 and a 0.46.....

Perhaps I should have said affordable sub-.40 size engines! Over £100 for a .15? Really? And has anyone (other than Just Engines) actually got any in stock?

Even in Japan, that 15 is over £70! So I say again, where are the small affordable engines?

--

Pete

Pete, Its simple economics. Thanks to cheap, powerful and quiet electric motors, the demand for glow engines is a tiny percentage of what it was. Development, tooling and production costs have to be recouped over a much smaller number of engines than in the past, so the unit price to the consumer goes up, further reducing the demand. There are plenty of new and nearly new engines on ebay etc. for less than the manufacturers can make them for, so only the niche engines will find a market.
That Mills .75 in Tom Sharp's posting cost a weeks wages when it was new. Even OS prices of £100 for a .15LA is actually a bargain, its just that we've been spoilt in recent years!

Martyn K04/11/2019 16:52:53
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4998 forum posts
3658 photos

I thought OS had stopped producing all 2 stroke glow motors along with SC/ASP.

I am not sure what the status is on OF FS engines, I believe that the smaller motors have been dropped as well.

Basically, everyone (nearly) is going electric..

Very sad indeed if that is the case.

Alan Gorham_04/11/2019 17:27:13
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1069 forum posts
129 photos

OS definitely still make the 25, 35, 46, 55, 65, 75 and 95AX type 2 strokes and the .15LA.

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