brokenenglish
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Everything posted by brokenenglish
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To go back to basics, it's the fuel surface that needs to be level with the spraybar (for zero head of fuel, positive or negative). In the OP, the fuel surface is higher than the carb, therefore you have a head of fuel, so it flows into the carb. Sorting out that point, logically, will cure the problem. If this tank positioning is inconvenient structurally then, as mentioned earlier, I would arrange a "uniflow" plumbing system, which I've done many times.
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OK, everything you say is true but, for me, a 6x4 is just too small for this engine, particularly with zero running in. For me, the "various props" that you mention shouldn't go down to a 6x4, and this would appear to be confirmed by the fact that the engine didn't want to run on that prop. OK, I'll stop now! The engine and workmanship look superb.
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Sorry , I thought it was obvious. It wasn't you that avoided a problem, it was the engine that avoided it by refusing to start on an insufficient load. I was simply questioning the idea of running an old design, side port engine, for the first time, on the smallest possible propeller. For comparison, your engine is similar to a Mills 75, but bigger, and I don't think anyone flies a Mills or an ED Bee on a narrow blade 6x4. Just sayin. Your engine looks superb, but surely trying to run a nice old side port engine on a tiny propeller serves no useful purpose. Just my opinion of course, and I'm fully aware of being a nit-picking ol' git.
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I would question the idea of running an old design 1cc diesel, for the first time, on a 6x4 which is even short on blade area (APC). You're lucky the engine didn't start!
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Your most unliked engine , petrol, glowor diesel.
brokenenglish replied to Engine Doctor's topic in IC Engines
No Robin, the ED engine made by Webra was the 1.5cc ED Hawk (very similar to the Webra Rekord). I see the ED Pep being criticised, but I've had 3 or 4 through my hands and they've all been excellent runners. The common feature between the Pep and the Hawk is that neither was actually made by ED. The Pep was actually made by an ED sub-contractor in Brentford High Street and was subsequently transformed to become the ZA 92. -
Your most unliked engine , petrol, glowor diesel.
brokenenglish replied to Engine Doctor's topic in IC Engines
The Cox reed-valve configuration. No access to anything. No flexibility. Unpredictable and inconsistent running. -
One point I thought of, but too late, is that your engine can't be a very early one because you mention removing the quickstart mechanism, and the early ones didn't have the quickstart gadget. I tried, unsuccessfully, to find the quickstart introduction date. In any case, this point doesn't change or invalidate any of the info you've already received.
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Yes, there was the S-75, with the cutout, and the P-75, without the cutout.
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The diesel is an early Oliver, sold as the Raylite Panther or Jaguar, through the Raylite Model Shop in Nottingham.
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I ran a Mills 75 inverted for years, in a Mercury Tiger Moth with never the slightest problem (wish I still had the plane). People's opinions don't count for much. If you have doubts, cut a mount from a suitable piece of wood and try it for yourself. For me, there's no problem and I definitely disagree with the statement that Mills don't like running inverted. It just isn't true.
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Can you identify this model please?
brokenenglish replied to Futura57's topic in All Things Model Flying
Great Planes "Ultimate" biplane. Here it is: https://outerzone.co.uk/plan_details.asp?ID=13254 -
Following my earlier post, a bit of Web browsing confirmed that the castings source I mentioned in Oundle was called "Woking Precision Models", and that their range was taken over by Hemingway around 2006.
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I didn't dare mention it... We all have moments like that...
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Here's the "other side" of my engine. Note the adapter, under the glow plug. I don't think the castings can be "Hemmingway" (whassat?), as this engine has been in my possession for more than 40 years. Your build threads have motivated me to run the Atom on sparks ASAP. I'm looking forward to it, but the weather is b-awful. I would expect the Atom to perform a bit better on sparks than on glow, but that's of no importance for me. "Nice running" is far more important than minor performance differences. I seem to remember that, decades ago, castings sets were marketed by a model engineering firm in Oundle, maybe my engine is from those.
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Here's my Atom Minor running on glow, at a time when I didn't have an ignition circuit. I'll run it on sparks as soon as we get some decent weather (reasonable light for photos/video).
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OK Here are the photos showing the engine id. Looking from the front, you can see E & D on the left and right, and Mk III below the shaft. Again, yours should be like this (it may be Mk II).
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Again, I think there's misunderstanding. Re-read my post. The front bearing is the casting bolted onto the front of the crankcase. If you look between the bolt heads, on the front of the engine, you should see an "E" and a "D", in the top part of the casting (above the shaft), and "Mk II" or "Mk III" below the shaft. Are those markings not there? I'll attach a photo within the next few minutes (I hope!).
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I've just noticed that you think your engine is "unmarked" (apart from the s/n). Surely it should be marked "ED" and "Mk II" or "Mk III" on the front bearing.
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Sorry John, there's a misunderstanding. Your engine should have the dish-shaped prop driver like my photo. This driver has a square hole that locates on the crankshaft. On your engine, the prop driver has been lost and replaced by odd washers with square holes cut to match the shaft. Those washers aren't original! All Comp Specials have a dish-shaped prop driver with a square hole, no exceptions. And all prop washers, that go on the front of the propeller (only one per engine!) have normal round holes. Like I said, your engine's original prop driver and washer have been lost and replaced by several odd washers with square holes. In fact, I think the reason you have several washers is simply to cover the square length on the shaft. No Comp Special ever had a front end like that.
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Your engine is from September 1948. Apart from the points already mentioned, the bits around the prop driver are not at all the way they should be. Here's one that's the same vintage as yours. Your engine should look like this. You can see the various differences for yourself. It's quite likely that your engine may run well. In good condition, they're super engines.
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Jeff, I thought your propeller choice seemed a bit big, so I checked the original article. Laurie Sparey obtained best results with a 13x6, but his 13x6 must have been wood, i.e. far lighter than your MA & APC stuff (and easier on the fingers!). I'm lucky to have a huge collection of old propellers, and I would never use a modern composite prop on an old engine. Wood is best, or old soft plastic in the smaller sizes. Maybe a little more ether and a little less compression would be a good idea.
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Shame the photo cuts off the top of your Owat.
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The photo is a bit "untidy", but I don't see anything of any significant value that would interest a collector.
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22 is a Majesco 2cc - Very rare indeed. 20 is a Dyne 10cc 18 is a Dyne 6cc 15 is an HP 3.5cc 23 is a Hallam diesel (I think!) All forties vintage rare English (and Welsh!) engines. I'll need to dig through documentation to identify the others.