Can anybody point to to somewhere that I can find a boost gauge? – probably lowish pressure (~12-20lb).
Before anyone asks I’ll confess that it’s for a supercharged prewar car – not an aviation application but many cars ran aviation boost gauges so I thought that this was a fair place to ask.
All pointers welcomed.
Thanks
Charles
By: aircraftclocks - 26th November 2012 at 10:06
From AP1275, the description of the operation of the Mk III boost gauge is as follows:
The instrument—when connected to the induction system of an aeroplane—measures the pressure in that system relative to a standard atmospheric pressure at sea level, and at 15° C. Under altitude variation in flight the pressure will vary and this variation in pressure, as well as the boost pressure applied to the system by the supercharger, can be read on the gauge. It is a continuously reading instrument indicating the immediate pressure at all times. No other than visual attention is required.
By: Drem - 26th November 2012 at 07:27
Thank you Eddie.
By: Eddie - 25th November 2012 at 23:43
Here’s my best shot:
The boost is the air pressure at the intake manifold of the engine. In the case of British engines, this was generally measured in PSI above or below Atmospheric pressure.
A normally aspirated (i.e. unsupercharged) engine can’t get above 0 PSI boost, whereas the later Merlin marks exceeded 20 PSI boost. This means you have a lot more air going into the engine, which carries a lot more fuel, and therefore can burn producing a lot more energy, producing more horsepower.
By: Puukka - 14th July 2004 at 16:20
Hello Charles
You could also try instruments page 1 and 11.
http://www.spitfirespares.com/
Cheers,
Herbert
By: 682al - 14th July 2004 at 13:10
If you’d like to send me a private message, I should be able to help.
Regards,
682al
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July 14, 2004 at 1:08 pm