1947 Micro diesel ??
11-08-2013, 04:41 PM
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1947 Micro diesel ??
Steve here... I have searched this site..Google, and YouTube... Other than a few video's on tube,I have come up almost no information on the alleged vintage Detroit made .157 Micro diesel. That being said,
You guys here are absolutely a wealth of knowledge and any help and or info would be great!
Thank you all again, Steven
You guys here are absolutely a wealth of knowledge and any help and or info would be great!
Thank you all again, Steven
11-08-2013, 11:26 PM
#2
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Hi Steven,
I've possessed three of these for the last few decades, and I run them occasionally (I like to run all my engines, apart from a very few that are too complicated or fragile).
If the one in the photo is yours, it looks very nice, but you're missing the specific spinner nut. That's no great problem. There are great engineers in Oz and the UK who'll produce an identical replica.
I don't have one in a plane at the moment, but I have flown one of these, years ago, in a Junior 60.
They are great runners. The only point I don't like is the ball and socket little end, like the small Cox engines.
Apart from that, they're really nice.
I have some Air Trails documentation (test) that I can dig out, but I only just saw your post, and I need the time to scan it.
Looking through my records, one of my Micros turned a Topflite plastic 10x6 propeller at 6600 rpm, on the English commercial fuel that I always use.
An ED Comp Special turned the same propeller at 6500 (same fuel and same running session), so the Micro is no great powerhouse, but a very nice engine.
Here is one of my engines.
Brian
I've possessed three of these for the last few decades, and I run them occasionally (I like to run all my engines, apart from a very few that are too complicated or fragile).
If the one in the photo is yours, it looks very nice, but you're missing the specific spinner nut. That's no great problem. There are great engineers in Oz and the UK who'll produce an identical replica.
I don't have one in a plane at the moment, but I have flown one of these, years ago, in a Junior 60.
They are great runners. The only point I don't like is the ball and socket little end, like the small Cox engines.
Apart from that, they're really nice.
I have some Air Trails documentation (test) that I can dig out, but I only just saw your post, and I need the time to scan it.
Looking through my records, one of my Micros turned a Topflite plastic 10x6 propeller at 6600 rpm, on the English commercial fuel that I always use.
An ED Comp Special turned the same propeller at 6500 (same fuel and same running session), so the Micro is no great powerhouse, but a very nice engine.
Here is one of my engines.
Brian
Last edited by brokenenglish; 11-09-2013 at 06:47 AM.
11-09-2013, 04:32 AM
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Brian,
Yes it is my engine, here is a pic of the spinner nut, no idea if it is correct, doesn't look like yours. My needle appears to have been changed out as well.
Mine so far has manged 5100rpm with an 11-6 wood Zinger. Had no idea it had a ball and socket until I look at it close yesterday.
Steven
Yes it is my engine, here is a pic of the spinner nut, no idea if it is correct, doesn't look like yours. My needle appears to have been changed out as well.
Mine so far has manged 5100rpm with an 11-6 wood Zinger. Had no idea it had a ball and socket until I look at it close yesterday.
Steven
11-09-2013, 06:39 AM
#4
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Steven, Here's the 1948 Air Trails write-up of the Micro.
Note that we're getting better rpm than the tester. This is probably down to early propeller pitches being very inaccurate.
Your 11x6 seems a bit big to me. IIRC, I didn't try any prop other than the Topflite 10x6 but, according to my notes, the engine ran really sweetly on it (otherwise I would have tried a different prop!).
Sorry, I seem to have attached my earlier image again, and I can't find how to delete it!
Note that we're getting better rpm than the tester. This is probably down to early propeller pitches being very inaccurate.
Your 11x6 seems a bit big to me. IIRC, I didn't try any prop other than the Topflite 10x6 but, according to my notes, the engine ran really sweetly on it (otherwise I would have tried a different prop!).
Sorry, I seem to have attached my earlier image again, and I can't find how to delete it!
Last edited by brokenenglish; 11-09-2013 at 06:50 AM.
11-12-2013, 04:39 PM
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Brian
Picked up a Master AirScrew 10-6 from the hobby shop this afternoon, with a 33/33/33 mix, the engine managed 6100 rpm in my 64f garage... it was in the low 20's here today.
Steven
Picked up a Master AirScrew 10-6 from the hobby shop this afternoon, with a 33/33/33 mix, the engine managed 6100 rpm in my 64f garage... it was in the low 20's here today.
Steven
11-13-2013, 02:35 AM
#7
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Yeah, I bet it started easily too. It's a nice engine to fly in something like a Quaker Flash or a light Simplex or Junior 60.
In the earlier posts, I forgot one anecdote.
Several years ago, I was playing with a Micro on the bench, and it really did start very easily.
My wife passed by and I invited her to try to start it.
She gave the prop a reasonable shove (you couldn't call it a flick) and the engine started immediately.
This is part of the beauty of these old diesels. I don't think I'd invite my wife to start a modern glow .40...
In the earlier posts, I forgot one anecdote.
Several years ago, I was playing with a Micro on the bench, and it really did start very easily.
My wife passed by and I invited her to try to start it.
She gave the prop a reasonable shove (you couldn't call it a flick) and the engine started immediately.
This is part of the beauty of these old diesels. I don't think I'd invite my wife to start a modern glow .40...
