As confirmed in previous posts, I am restoring the port engine from Avro Anson G- AGPG and have a question relating to the exhaust configuration. The engine has the correct serial number for the port engine (80666), both on the manufacturer’s plate and stamped on the crank case. The number ties up with the aircraft log book as per the entry for March 1957, when the engines were changed from Cheetah Mk 15’s to Mk 17’s. The serial number also ties up with a later entry in May 1964 (see attached pictures).
On all contemporary photographs, of Aggie Paggie post 1957, the exhaust pipes are shown exiting the nacelle on the outboard side of each engine, i.e. on the port side of the port engine. (see picture from Southend museum 1972)
I have seen various configurations of Anson Exhaust, some exiting inboard and some exiting outboard and I am not sure why there is a difference. From an engineering point of view the exhausts are “handed” and the exhaust cylinder stubs particularly on cylinders 4 and 5 are significantly different (see attached pictures. The pictures show the engine stubs on cylinder 4 on both the port and starboard engines when being collected. The other pictures shows the trial fit of the exhaust to the restored engine).
Getting to the point, the exhaust stubs fitted to both the port and starboard engines are configured such that the exhausts outlet the nacelle inboard, which does not align with the photographic information. The stubs looked to have been in that position since the engines were operational, i.e. pre 1972.
To further confuse me, the port engine has blanking plates fitted where the Hydraulic pump and compressor should be fitted, the alleged starboard engine had temporary plastic covers fitted. The Cheetah auxilliary configuration on the Anson was hydraulic pump and compressor fitted to the port engine only.
Could the log have been in error regarding the serial numbers for the port and starboard engines, from 1957, and the error perpetuated throughout Aggie Paggie’s history? It is possible, but seems unlikely.
Can anyone with specific Aggie Paggie experience or general Anson / Cheetah knowledge offer an explanation?
It doesn’t affect my project but it would be good to know. I would of course have to change my user ID.
Regards G-AGPGPORT
By: dudley kirk - 18th February 2013 at 17:45
Engine 80445 id plate pictures
Hi g-agpg, Here are the pictures of 80445 engine number & id plate, cannot see any changes to a mk17, also the condition inside the engine shows it has not had a lot of use, Any ideas?
By: Arabella-Cox - 16th February 2013 at 23:52
Access to logs
– and Jon H, too. He owns a half share in the old shed…I mean, girl:D
Anon.
By: G-AGPGPORT - 15th February 2013 at 12:24
Thanks to Anon.
Should have said thanks to Anon for access to the G-AGPG logs
By: G-AGPGPORT - 15th February 2013 at 12:21
G-AGPG Engine Change Timeline
I have now had chance to review the logs in detail and have attached a timeline of the engine changes from first flight to last. This answers my questions of why AS80666 started life as port and ended it as starboard. It’s not always documented why a change was made but there are some entries based on “out of hours” etc. It gives you the option of configuring your engine as port or starboard since either would be historically correct for a given period. I intend to configure 80666 as a port engine as this aligns with the other parts I have from Aggie Paggie e.g engine bearer, cowls etc. It also covers the period when it was owned by Avro through to Ecko.
Regards G-AGPGPORT
By: dudley kirk - 13th February 2013 at 15:35
cheetah 15
Hi, The crankcase stampings mk 15 have not been changed, trying to get picture but too big to post. will look into that.
The mk 15 Cheetah Manual states in chapter 4
Installation.
Exhaust collector long stubb fitted to cyl no 5 for port engine.
Exhaust collector long stubb fitted to no 4 cyl for starboard engine.
As you said with yours my stubs look as original fitments for a port engine.
TTFN Dudley.
By: G-AGPGPORT - 6th February 2013 at 20:07
Avro Anson Aggie Paggie – Exhaust Configuration Question
Hello Dudley,
Thanks for the reply. As you can see from the attached pictures of the aircraft logs, 80445 was designated as starboard in March 1957 but in May 1964 the starboard engine was designated as 81899 and no mention of 80445. However I know 80445 was together with 80666, and the airframe, when I collected my engine in early 2012.
Do you have any other information on your engine, 80445, which confirms it was the port engine other than as you state the exhaust exits the nacelle on the port side?
Another interesting point, which your post highlights, is 80445 is/was designated as a MK15 but 80666 was a 15 but re-designated as a MK17 as per the pictures I have attached of the crankcase stamping and the nameplate. My understanding is that the 15 and 17 only varied with respect to the carburettor type. The 17 being was fitted with a Claudel Hobson AV70MH, which is a single lever carburettor with no manual control for mixture strength, in place of the AV70MG fitted to the Mk15. I can’t imagine two engines on the same aircraft being different Mk’s.
It sounds like I need to have a more detailed review of the logs. I don’t have them but I know a man who does, who has been very helpful to my project, and I am sure he will let me review them.
Regards G-AGPGPORT
By: dudley kirk - 6th February 2013 at 13:49
Hello, New to the forum & getting to grips with its use please bear with me.! If not already stated i have the cheetah engine no-80445 MK15 this is also a port, exhaust exits to the left of the engine. The engine seems only a few hours use, as the internals are in good condition, bright not oil stained brown, usual crud in rocker boxes.
Regards Dudley
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February 3, 2013 at 8:28 pm