I recently purchased one and even more recently was given a few photocopied pages with technical details of various Marks of these indicators.
According to the description of the Mark VI mechanical engine-speed indicator, it was designed for multi-engine aircraft which had created a requirement for exceptionally long flexible drives. The document also mentions that “the instrument can be mounted on the engine nacelle in such a position that it is visible to the necessary members of the crew.”.
I would be interested in knowing any particular aircraft type that had engine-speed indicators mounted on the nacelles.
By: bazv - 21st November 2021 at 14:52
I see what you mean Buzz,I wonder if it was just the early DH Dragons with the external RPM gauges.
I cannot find my own Dragon Rapide pics at the moment but I have borrowed a couple of pics from net – maquettes
https://www.net-maquettes.com/pictures/de-havilland-dragon/ which show DH Dragon ‘IOLAR’
You can see the ‘teardrop’ cutout in the top rear of the inner engine cowl
Close up of RPM and Oil Pressure gauges
rgds baz
By: buzzbeurling - 21st November 2021 at 14:23
Thanks,
I looked at a bunch of pics of the various aircraft and could not see any indicators except on the Vimy. A picture of any other aircraft with such a setup would be great.
By: adrian_gray - 20th November 2021 at 17:59
Possibly the Vimy and it’s derivatives? I recall that one of Alcock and Brown had to climb out on the wing during their transatlantic flight to chip ice off the gauges.
By: bazv - 20th November 2021 at 17:05
DH Dragon/Rapide
By: Arabella-Cox - 20th November 2021 at 16:06
Monospar.
ISTR Short Scion too.
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November 20, 2021 at 3:57 pm