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Old Feb 09, 2010, 05:10 AM
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Agree, this one seems particularly "brave".
A lightly built sparky would not be my first choice.
Designed for about 6:1 compression ratio, now asked to cope with 18:1 or more.
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Old Feb 09, 2010, 12:36 PM
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Instruction manual for Frog 150 MkIII attached.
Old Feb 15, 2010, 09:25 AM
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Diesel old and new


I was looking at an older MVVS 2.5 cc diesel. A seller was stating that he had a .25 diesel and did not seem to know the difference between the two sizes. Providing the head diameter measurements just seem to add to the confusion. There is no .25 diesel (MVVS), but there is a glow. The picture shows the size difference.

Twin-Stack, the Meyer store for men, basement hobby department. What neat diesels! Maybe someone has one of these engines and could share a few pictures with us? Warren, the 1.9 Kestrel?

Nice add for the Frog, “crash proof”. There seems to be a very big price difference between the Frog and the Kestrel. What was the better engine?
Old Feb 15, 2010, 03:55 PM
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Hi John,
as requested, my Kestrel.
Runs well although the compression tends to back off.
A pity to add a locking lever to spoil the nice head shape so I'll make a new contra one day.
Old Feb 15, 2010, 07:11 PM
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Quote:
Originally Posted by JohnAV8R View Post
I was looking at an older MVVS 2.5 cc diesel. A seller was stating that he had a .25 diesel and did not seem to know the difference between the two sizes. Providing the head diameter measurements just seem to add to the confusion. There is no .25 diesel (MVVS), but there is a glow. The picture shows the size difference.
There was a 2.5cc MVVS tested in Nov '58 MA magazine. Could that be it ?
Old Feb 16, 2010, 12:33 PM
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It could be the early 2.5 MVVS.

http://www.old-engine-model.com/inde..._-brno&lang=en

Greg
Old Feb 16, 2010, 08:03 PM
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Chas, that your “sparky” ? Any specs on it?

Twin-Stack, for the year 1950, the Kestrel at pounds 7/2/12 seems very expensive. My ETA .15D was less than pounds 6 about 1961. And we have a picture of a real one above.

Warren, nice looking diesel, and display mount. Does the knurled ring at the bottom of the cylinder screw the cylinder on, or is it part of the cylinder.

Patmcc, I guess by older, I should have said 2 or 3 models past. At least 1970 or newer. Following site suggests a similar build to that of the 1977glow version shown.

Gkamysz, there’s a lot of really nice MVVS engines there. Nicely presented. I see a flavour for Dooling and McCoy racing engines. No, the MVVS the seller had was a 2.5 cc with a black plastic rear cover. Other than that it had the same carb and looks of the newer 2.5 with the blue anodized head.
I once had an older 2.5D MVVS, but the crank snapped when it was running. No, not a crash, but in the air. It was putting out power similar to a ST .19 glow.
Old Feb 17, 2010, 01:48 AM
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Voices through wires? Ha!
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No John, it was just a recent eBay item. Obviously the S. Cyclone, with shortened stacks and a custom tank as well as head - and I wouldn't care to turn that tommybar without my marigolds - but beyond that I know naw thing; it went for US $232.50.
C
Last edited by Chas; Feb 17, 2010 at 01:55 AM.
Old Feb 19, 2010, 02:50 AM
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Bensen-Thorning 2.5 cc


They don't turn up too frequently.....here is a Danish Bensen-Thorning 2.5 cc diesel from around 1949.
I found this photo at a Swedish auction site...and,no, I'm not bidding...

Fascinating stuff...

.
Last edited by Gluehand; Feb 19, 2010 at 02:55 AM.
Old Feb 19, 2010, 09:57 AM
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Quote:
Originally Posted by Gluehand View Post
They don't turn up too frequently.....here is a Danish Bensen-Thorning 2.5 cc diesel from around 1949.
I found this photo at a Swedish auction site...and,no, I'm not bidding...

Fascinating stuff...

.
It looks just like what I use to turn on the garden hose in summer.
Old Feb 24, 2010, 07:30 PM
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More 2.5 diesels.
An older engine, but in excellent condition.
Old Feb 26, 2010, 03:26 PM
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Few Yugoslavia produced diesel engines, AERO 250, late 1950s-early 1960s.

Old Feb 26, 2010, 07:33 PM
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Thank you SuperCuber for posting the Aero 250 engines. Nice picture. Did these engines ever come with a RC carb? Can you tell us a little about their power with a given prop and at what rpm.
Old Feb 26, 2010, 07:57 PM
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Quote:
Originally Posted by JohnAV8R View Post
Thank you SuperCuber for posting the Aero 250 engines. Nice picture. Did these engines ever come with a RC carb? Can you tell us a little about their power with a given prop and at what rpm.
Well, they must have been pretty good because I remember that Emil Fresl or Yugoslavia became World Champion in free-flight with one of those in his "Taltos" model. Year??
Old Feb 26, 2010, 08:07 PM
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I thought he used an Oliver Tiger for the win? Jack


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