Recent content by brianwnz

The attached document is a small section of AVIA 8/405 dealing with the Napier Culverin, and Napier's discussions with Junkers. It gives an idea into some of the problem areas; mentions the Jumo V (later 205), and has some hours run on engines with the newer piston design (at the time). Hope...

Found a little bit of stuff about the Do 18; not sure if you have it already, but hopefully it is new to you. It's in German, and I've only translated part of page 8, as it related to the diesels (well, Google did the translation actually ;)); looks like the unusual engine configuration in the...

Certainly seems that way; I think most two-stroke diesels tend to have issues in the same area sooner or later in their development, but it is apparent this was a real problem at the time for Junkers (and Napier). I will keep digging though for other issues, and especially relating to the Do 18.

Some stuff so far regarding piston/ring life. These are all from AVIA 2/1934; the attached two files include a Napier letter discussing their "little difficulty" with pistons/rings, and a contemporary American article mentioning piston issues. I'll keep looking for Do 18 (or any other)...

Attached is an extract from from AVIA 8-436; seems to indicate 250 hours, but at 500 hours the engine was considered end-of-life - this is likely in Lufthansa service, I don't think I have a lot specific to the Do 18, but am still looking:

Without looking anything up (will try and do that in coming days), generally the main problem on the 205 was the top ring & piston - it (the ring) just couldn't take the heat for long without losing tension; that then just shifted the problem down to the next ring and so on. I think many detail...

Here it is....

Thanks Calum, Appreciate the advice, that is exactly what I'm going to do :) Regards, Brian

Thanks Calum, Aaaah, sadly that's exactly who I wanted to contact, as well as Aerospace Bristol...... It is a pity it isn't just handed over to National Archives; they at least seem to have a very good system of remote access - and I envy those of you in the UK who can turn up in person and...

Thanks Thomas, I have all three of Mr Wilkinson's books, sadly he doesn't mentioned what happened to the Phoenix - possibly too soon after events to know or think about what happened to the engine/s themselves. I did stumble across the link to George Hallett's papers recently, and the staff at...

Does anyone in the UK (or anywhere else for that matter) know what happened to the original Bristol Phoenix engine? According to the records I have regarding it (AVIA 8/436), the "one and only prototype" was in a museum in 1938 - anyone know what museum? Has it survived today? If not, anyone...

I may have found a little more evidence regarding these symbols, so thought I would share again. I've given the original German text also, as my translation is only ever courtesy of Google ;) Which seems to translate as: "Pre-calculation of Altitude Performance By Otto Schwager For the...

Thanks Calum, I was rather hoping you might respond, as you've probably studied more than a few German reports, and can presumably speak a little more German than me (mine is solely Google, and Commando comics from many moons ago). The report is by Wunibald Kamm, about the BMW diesels; I'll...

Thanks Tom, Yeah it was the 114 water-cooled diesel (same capacity as the 132); they changed to pilot-injection (can't be 100% sure on this particular engine test, but they certainly experimented with it), and I'm reasonably confident that's what they are saying; and had made changes to the...

Hi All, I'm trying to translate some German test data, and struggling with the subscript 'o' - anyone know what it stands for? In particular, if Ne (subscript e) = effective power (brake hp), what is No (subscript o), and Neo (both e & o subscript)? Calling them all Leistung is not helping me...