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342. Fake News

03/01/2018

The search for truth never ends.

We are of course interested to see if 1264 matches up to the original performance figures. But what are the original figures? Here are the figures from various sources, including the numbers from the US quoted below, which we only came across last night.

Performance figures, Bristol Scout Type C with 80hp le Rhône engine

 

Source Date Max speed, sea level, mph Time to 1,000ft, min Time to 10,000ft, min
Book of Bristol Aircraft 1948 95   21.3
Bristol Aircraft, by C Barnes 1964 93 60sec  
Windsock Datafile, J M Bruce 1994 92.7 55sec 21.3
The British Technical Department AP 1916 89 (@6,500ft)   21.3
US Division of Military Aeronautics Technical Order no. 1. 1918 88.3   23.45

The 1948 Book of Bristol Aircraft quotes 95mph for types 1, 2 and 3, increasing to 104mph for the Type 4 and 110mph for the Type 5. How these type numbers relate to the normal Types A to D isn’t clear – and doesn’t identify which engine is fitted in each case.

US Division of Military Aeronautics Technical Order no. 1 uses data obtained from serial number B763 which was sent across to the US for evaluation as a possible trainer, and was a slightly tired Type D.

So how does 1264 compare?

Well, the fastest I’ve managed to achieve is around 75kt, or 86mph. This is not very scientific, since I’m only reading the ASI and guessing what is straight and level, but it won’t be too far off. The engine is continuing to bed in and may deliver more power during the year. It would be interesting to try with some more accurate instrumentation at some point, and in colder weather, which will make a significant difference.

The maximum rate of climb I’ve achieved is around 800fpm, but climb performance in any light aircraft is affected to a very large extent by turbulence, temperature, humidity and so on. I suspect on a cold day we could get considerably more, though possibly not as much as 1,000fpm. It will be interesting to see if we can get more data during 2018.

All told, they are still slightly disappointing, though probably as good as one can expect in the circumstances.

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