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Old Jan 15, 2016, 07:38 PM
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A home made 5cc (010) 4 stroke

A long time ago (50 years!) my Dad, who was a serious model engineer, made this.
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One of the first small model plane 4 strokes it ran on petrol.
Even more unusual (even now!) it has a pressure oil feed to the big end and a dry sump so it ran on 'pump' petrol with no oil in it.
He produced this section drawing as well.
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An advanced layout with 45 degree inclined valves, a two ring slipper piston, hemi head with free flow ports and a float carburettor. No 'transistor' ignition then so it used a tiny contact breaker with a conventional HT coil.
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It was actually built to attempt the world endurance record for planes limited to 10lbs weight which then stood at 13 hours with a conventional glow 2 stroke.
My dad reasoned that not only does petrol have a higher calorific value than methanol but there would be an additional 5% advantage not having the oil in it . The other benefit of a 4 stroke is its much superior part throttle economy. An important feature on a plane where the fuel would constitute 50% of its take off weight.
The 5cc was extensively tested and demonstrated that it would run for something like 24 hours with a decreasing throttle setting using just 5 pints fuel.
The plane was never built as shortly after completing the engine the FAI abandoned the power endurance record on safety grounds.
It does still run but not for long in respect to its age and coupled with the fact I do not have the necessary skills to mend any part of it!
5cc aero engine (0 min 37 sec)

It does blow a bit of oil smoke at tick over, it really needs an oil scraper ring adding, but the exhaust clears completely at full power.
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Old Jan 15, 2016, 08:15 PM
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I'd rather be flying.....
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What a nice story and engine ! Thanks for the video !

best regards,

jeff
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Old Jan 15, 2016, 10:02 PM
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Excellent - A very skilled father!

Thanks for sharing it.

* Danny M *
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Old Jan 15, 2016, 10:35 PM
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If 10 cc's is a 60 then I think 5 cc's should be a 30.
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Old Jan 16, 2016, 02:56 AM
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Nicely made engine
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Old Jan 16, 2016, 04:15 AM
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I bail out, anywhere, anytime
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Quorneng,

Very nice designed and built engine.

Taurus Flyer
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Old Jan 16, 2016, 06:49 AM
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Wow! Your Dad was the Man!
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Old Jan 16, 2016, 07:18 AM
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I HATE GLOW PLUGS!
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Quite the engineering masterpiece! Your Dad was a genius & master craftsman. I really like the dual exhaust. It gives it quite the throaty tone.


Wouldn't 5cc = .30 cu in ?
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Old Jan 16, 2016, 09:43 AM
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That is a great little engine. Your dad was a master. I think it is much more difficult to make a small engine than a larger engine. As the tolerances become ever more critical as the engine gets smaller. The engine design is nice too, quite creative.
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Old Jan 16, 2016, 10:00 AM
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The castings alone are impressive. Not to mention the O.S. type of cross driven cam gear (which in my opinion is a more "elegant" design that the spur gear setup that Saito uses).

All in all VERY impressive!
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Old Jan 16, 2016, 10:13 AM
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Outstanding!
Leo
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Old Jan 16, 2016, 10:17 AM
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The spur cut gear is more efficient, the helical cut gears having more friction therefore generating more heat. The helical cut gear is stronger but strength is not an issue on the Saitos.
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Old Jan 16, 2016, 11:29 AM
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Chrome > Nickel
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Which gear style gives a more precise engagement/timing?
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Old Jan 16, 2016, 12:05 PM
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Quote:
Originally Posted by 1QwkSport2.5r View Post
Which gear style gives a more precise engagement/timing?
That's dependent on gear tolerances and backlash.

Professor Chaddock was very knowledgeable of model engines and this design shows.

FAI still has a category for duration flight. Maynard Hill's Atlantic crossing flight held the record until FAI removed the autonomous category and required 80% of the flight to be piloted by the record holder. One of Hill's earlier flights still holds that record.

Greg
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Old Jan 16, 2016, 12:39 PM
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I am impressed with the force feed lubrication.... I'd like to know more about that....

Some time ago I was a bit "brain-designing" for something similar on an OS 91 fourstroke, and my thought was just to adapt the backplate with a (rather large) oil exit, and have a small pump inject oil via the original breather nipple, assuming that if the oil leaking past the ring is able to lubricate the conrod, then so would an amount of oil sloshing around, being replenished all the time.

Never built it, it was just for fun, but what I see here (oil feed through a rotating distributor in the backplate) borders on brilliant....
Can't see how the oil is being returned to the sumptank though....
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