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Old Mar 30, 2011, 09:40 AM
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Frog 1.5s

I was a great fan of Frog 1.5 diesels back in the late fifties and early sixties. I had the original silver head 150, the blue head "racing" version the 150R (great engine) and the later 150 with the same shape (blue) head as the 100 more powerful than the original silver head 150, but not as good as the 150R). My brother-in-law and I also had a Frog Viper each. This later Frog 1.5 was a ball-race, drum-valve engine and ours were absolutely terrific motors. Not to be confused with the cheaper plain bearing glow plug version, the Venom, which was a pretty anaemic performer. Our Vipers were initially flown in Frog Talisman and KK Gazelle stunt/combat models, and then in copies of Mike Bassett's "Little Warrior" 1/2A team racer, where they proved to be nearly as quick as the current model of Oliver Tiger Cub, but more economical, giving greater range. They were easy starting, smooth running, flexible and powerful - what more could you ask? OK, a little heavier than the plain bearing 150R, and somewhat more awkward to mount due to the rear drum valve, but much easier handling.

Regretfully, I don't have any of these Frog 1.5 engines any more, being almost exclusively into electric R/C, especially vintage and scale, but I wonder if any of you collector/engine specialist guys on the thread have a photo of the Viper you might post to remind me of all the enjoyment we had from ours.
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Old Mar 30, 2011, 10:24 AM
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Is this a Frog 150MkIIR as in the1958 review?
I've had it for while, but am not sure of the exact type.
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Old Mar 30, 2011, 03:51 PM
I like real wooden aeroplanes!
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Hi JMP

Yes, that looks exactly like the 150R I had - only really visually distinguished from my previous 150 by the blue anodised head. We never referred to it as a "Mk IIR", but reading the engine review, obviously Frog called it that. Then again, my original, silver head, Frog 150 was probably a Mk II(this was bought about 1956), certainly, as it says in the review, I can confirm that my "R" was considerably up on this on performance, it was a really good motor. I don't know whether the later blue head 150 I had (the one with the same head shape as the 100 in the review, rather than the "onion" head) was internally the same as my "R", but as it was also significantly more powerful than my original silver head 150 I suspect it probably was.

How does your 150 go?

George
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Old Mar 30, 2011, 08:41 PM
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Here's something in the "rocking horse" category. Will be interesting to see how much it fetches ! BOB
http://cgi.ebay.co.uk/ANTARES-ATOMAT...item4cf636d9ca
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Old Mar 30, 2011, 10:52 PM
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That Antares 5cc engine is pretty superb, if I say so. Does it even use a needle valve for mixture control? Or is that interesting rotating valve a mixture control and something like a throttle?
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Old Mar 30, 2011, 11:44 PM
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Quote:
Originally Posted by Sundancer View Post
...Yes, that looks exactly like the 150R I had - only really visually distinguished from my previous 150 by the blue anodised head...
Okay, then it is a 150R
Quote:
How does your 150 go?
I haven't run it yet, not having a model for it, and with so many other projects to complete...
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Old Mar 30, 2011, 11:51 PM
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A little quiz: What is this 2.5cc engine?
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Old Mar 31, 2011, 01:17 AM
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I think it's a Retro 2.5 cc Luxemburg.
Ron's excellent web site http://www.modelenginenews.org/
has a page on them.

Retro also made some nice twins, can't remember where I found this picture.
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Old Mar 31, 2011, 04:48 AM
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Quote:
Originally Posted by Warren B View Post
Retro also made some nice twins
A very neat looking 'integral' sideport solution with its rear mounted carb....although beeing a 'friend of symmetry', I feel that a centre mounted carb would have been a better solution in order to acheive an even running....

Beeing a diesel however, it would be possible to adjust this to some degree, by fine tuning the compression settings...a somewhat 'crude' solution though, as I figure this wouldn't create identical combustion conditions considering temperature, lubrication etc.....

On a glow engine, I beleive this design would provide more problems....

...just thinking out loud....
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Old Mar 31, 2011, 05:01 AM
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Hi

Im finally getting back to my os 15 glo to diesel conversion that didnt move my plane , not even 1 inch , the compression was low because with the baffled piston the head has a big cuttaway to clear it,,,,,,, and with the contra right down on the piston the comp was too low, , got a new head coming that might make the model move , its fixed compression with the ability to add a contra at a later date
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Old Mar 31, 2011, 05:52 AM
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Quote:
Originally Posted by earlwb View Post
That Antares 5cc engine is pretty superb, if I say so. Does it even use a needle valve for mixture control? Or is that interesting rotating valve a mixture control and something like a throttle?
Here you go Earl !
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Old Mar 31, 2011, 05:53 AM
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Quote:
Originally Posted by JMP_blackfoot View Post
A little quiz: What is this 2.5cc engine?
JM, I had NO idea what that thing was ! BOB
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Old Mar 31, 2011, 07:36 AM
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Quote:
Originally Posted by Warren B View Post
Retro also made some nice twins, can't remember where I found this picture.
As Twin-Stack would say:
"I had no idea he had also made twins".
I got this engine at a 4A meeting (4A stands for "Association des Amateurs d'Aéromodèles Anciens", aka. the French SAM 70), with just the name "Retro".
Then a few years later, I stumbled on the page on modelenginenews. Here it is.
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Old Mar 31, 2011, 01:21 PM
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Quote:
Originally Posted by Warren B View Post
Retro also made some nice twins, can't remember where I found this picture.
Googling "André Demesse" resulted in this:
http://modelenginenews.org/prod/retro_twin.html
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Old Mar 31, 2011, 01:52 PM
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Thanks TwinStack, that is so cool, they built the fuel tank right into the front of the engine next to the crankshaft there. The one on ebay had a simple knurled cap there, making me thing it was the needle at first.
Very interesting on how it doesn't have a needle valve to adjust but uses a fixed needle instead. That would be a interesting story on how they did that too.
The throttle barrel is fascinating as well. especially way back then just after the war.
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