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Old Aug 16, 2015, 05:12 PM
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"Unnecessary Necessity"
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Here is an old post about this 1946 engine:
http://www.rcgroups.com/forums/showp...postcount=1197
It was sold as casting to be machined at the time(the post above is a modern build)and some found their way on ebay:
http://www.rcgroups.com/forums/showthread.php?t=1808234
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Old Aug 16, 2015, 05:49 PM
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Thank you Coriolan
Ernesto
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Old Aug 16, 2015, 08:51 PM
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Larry did real nice work on his motors.
I have # J-046

Ross
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Old Aug 21, 2015, 04:14 AM
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Sticks, Tissue & old Diesels
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Answer to Condo from the diesel thread

Ok Condo, concerning the points, there's no problem 'cos the whole timer assembly is a McCoy.
ST didn't make timer assemblies. The G24 was sold in both glow and ignition versions, but the ignition version was supplied without a timer. The crankshaft had the cam ground on, and there was the appropriate opening in the front bearing, but you had to fit a MCoy, Dooling or Hornet timer.
Mine run using McCoy 60 or 49 timers.

Concerning the intake. There are two different types, depending on the "version" of the engine. Both are shown in the photos. As you can see, the first version of the engine has the "cast-in" intake, with no separate backplate, whereas the second and third versions have the separate backplate, with at least two options of venturi insert, and the choice of either the straight through spraybar, or the "peripheral dribble" arrangement... Note that the fuel needles are different as well. The second and third versions use the normal (standard) ST needle and spraybar.
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Old Aug 22, 2015, 03:39 AM
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Quote:
Originally Posted by brokenenglish View Post
Ok Condo, concerning the points, there's no problem 'cos the whole timer assembly is a McCoy.
ST didn't make timer assemblies. The G24 was sold in both glow and ignition versions, but the ignition version was supplied without a timer. The crankshaft had the cam ground on, and there was the appropriate opening in the front bearing, but you had to fit a MCoy, Dooling or Hornet timer.
Mine run using McCoy 60 or 49 timers.

Concerning the intake. There are two different types, depending on the "version" of the engine. Both are shown in the photos. As you can see, the first version of the engine has the "cast-in" intake, with no separate backplate, whereas the second and third versions have the separate backplate, with at least two options of venturi insert, and the choice of either the straight through spraybar, or the "peripheral dribble" arrangement... Note that the fuel needles are different as well. The second and third versions use the normal (standard) ST needle and spraybar.
Hi thanks should have talked to you 20 years ago .
The motor on the left with cast in venturie is the one i have .
MY old man brought it NEW from well known hobby shop here in australia in the very early 50s.
He said it didnt come with a set points .
What worried me about the engine was the slot for the points looks like it cut with a hacksaw,but it does have a cam on the cramkshaft . the box also contains a small spanner and a neat plug spanner.
we only ever run this one on glow so far and it the noisiest engine i ever run much louder than mccoy 60 or dooling 60.
it may well have been among the first "short Stroke" engine.
I may be wrong but i think the G24 dates from 1948 ,as i read somewhere about the Italians using it in a speed comp in Italy in 1948.maybe you have more information
regards condo
ok thanks more information now .
regards condo
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Old Aug 22, 2015, 04:09 AM
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Hi Condo, I also have seen it written (by people who should know) that the G24 dated from 1948, and I believed it.

However, last year (I think) we had a bit of a discussion on this forum, and my Australian friend David Owen, pointed out that there was no trace of the G24 before the 1953 World Speed Champs (which were for 10cc engines at the time), and that, even the report on those champs, described it as a prototype (that's probably just the reporter's term for a new production engine).
Anyway, David was pretty convincing, so I had a good look through all my sources, and there's nothing pre-1953. So I'm sure David was right.

Your Dad must have purchased an early one. There's an easy check. The very early ones were serial numbered (from memory, mine, in the photo, is S/N 118), so yours probably has a S/N.

Your first version is also best for playing on the bench, or any non-competitive application, because it runs well on suction. The later versions really need pressurised fuel (crankcase, balloon or a very high tank).
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Old Aug 22, 2015, 06:23 AM
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G24

Hi i just checked my motor and there no serial no.i can see.!
I attach pics of it .you can see the rough timing cut i talkes about .
You will also see the inlet tube has flat top .
in 1980 dad had it in a big 10ft model that we flew .10000 acre back paddock helps .
one free flight ended badly and chipped the intake so he filed it flat [&^%$ happens ] .
In the late 80 maybe early 90 i was going to use the motor in Old Timer compete here in Australia.I asked David Owen to help date the motor his reply was 1948 .I have somewhere a model Mag with the speed entry in it .must find it .
somewhere in the dark reaches of my model papers i should have the letter David sent me .
condo
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Old Aug 22, 2015, 07:48 AM
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Quote:
Originally Posted by condo View Post
Hi i just checked my motor and there no serial
In the late 80 maybe early 90 i was going to use the motor in Old Timer compete here in Australia.I asked David Owen to help date the motor his reply was 1948 .I have somewhere a model Mag with the speed entry in it .must find it .
somewhere in the dark reaches of my model papers i should have the letter David sent me .
condo
Condo,

If I ever said the G24 was from 1948, I was wrong. Sorry
The earliest model G24 is from 1954. I bought one from Hobbyco in the early '60s, when they were specialled out.

There was a very well-known c/l scale modeller, Alan Talbot, who used the G24 exclusively in superb models. I remember in particular his Beaver and Bonanza. Neither flew well, the G24 being entirely unsuited to this type of model.

cheers
sabre250
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Old Aug 22, 2015, 07:57 AM
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yep dad got this one from Hobbyco .he said he brought it a year before i born ,i born 4/54
Anyway not to worry .unlikely i use it in competition .
maybe catch up in Cowra .
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Old Aug 22, 2015, 08:25 AM
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Condo (and David), there's a photo of a G24 in the A/M August '53, taken at the World Speed Champs, held on June 12th-14th 1953.
I know the text says it's a prototype, but it looks the same as mine with some filing done on the head fins.
Following our earlier discussions, this was the earliest reference I could find.
The engine was running as a glow, with a balloon tank.
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Old Aug 22, 2015, 10:06 PM
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I'd rather be flying.....
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P.G.F.Chinn Feb 1957 Brown Jr. D review article scan

Everyone-

this is Peter Chinn's enthusiastic review of the Brown Jr Model D....

enjoy,

Jeff
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Old Aug 23, 2015, 01:24 AM
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1953 maybe.

MODEL NUMBER ENGINE TYPE
(Diesel/Ignition/Glow) DISPLACEMENT YEAR INTRO.
OSAM G-13 D 5.28 cc 1943
OSAM G-14 D 5.65 cc 1946
OSAM G-15 D 6.28 cc 1947
OSAM G-16 D 5.96 cc 1947
OSAM G-17 D 9.80 cc 1948
OSAM G-18 D 2.82 cc 1948
Supertigre G-19 D/G 4.82 cc 1949
Supertigre G-20 G 2.47 cc 1950
Supertigre G-21 G 4.82 cc 1951
Supertigre G-22 G 1.30 cc 1951
Supertigre G-23 D 2.47 cc 1953
Supertigre G-24 I/G 9.81 cc 1953
Supertigre G-25 D/G 0.95 cc 1954
Supertigre G-26 D/G 1.49 cc 1954
Supertigre G-27 D 3.28 cc 1954
Supertigre G-28 D 0.50 cc 1955
Supertigre G-29 D/G 0.80 cc / 0.95 cc 1955
Supertigre G-30 D 2.47 cc 1957
Supertigre G-31 D 1.46 cc 1957
Supertigre G-32 D 0.95 cc 1956
Supertigre G-33 D 1.46 cc 1964
Supertigre G-33 G 1.93 cc 196
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Old Aug 23, 2015, 02:46 AM
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Castings

Sabre 250.. are these of value please .
i believe you completed a few Manx ,several years ago!!!
somewhere i have the manx plan!
condo
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Old Aug 24, 2015, 12:45 AM
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mccoy 49 series 20 ???????

These were suppose to be series 20 , 49 parts.
but the more i dig the more the 49/20 seems to be an illusion.
cases and liners and cranks and front housings all the same as black case motors .
So for sale as i lost interest in building one.
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