Ad: This forum contains affiliate links to products on Amazon and eBay. More information in Terms and rules
I believe the only real difference between the Xirs and Xcrs is that the the Xcrs had a modified reduction gear case and a prop shaft with a through-hole in order to allow a motor cannon to be mounted with the barrel through the prop shaft.
Agreed. From the pictures, the prototype used a metal, ground adjustable propeller, most probably Ratier, production series machines were equipped with a wooden propeller, most probably Chauvière. I used a variable pitch propeller in the model in order to collect data about optimal advance ratio and diameter of the propeller.The SPAD.510 had a two bladed, fixed-pitch propeller. I have not identified the model.
A very interesting conversation. I sometimes forget there were more than two nations developing aircraft. (Japan and US)
Thank You!1) I think the third graph is not ...
Thank You!
1) corrected axis title
2) large-dot line in the middle of the bell-shaped curve is the speed for a maximum rate of climb, max continuous power; blue set of dotted lines show the effect of using take-off bust setting, 960 mm Hg instead of 880 mm Hg;
3) left hand side of the bell-shaped curve is the true air speed at maximum lift, full power on approach to stall, if there is excess power, or just the minimum speed to fly at constant altitude (about approximately 7700 metres).
Best regards,
Yavor
View attachment 852378
...
I think the two sides of the "bell" curve should not have the same aspect - let's say, the same color.
...
For me the curve represents a theoretical "1-g flight envelope". The aircraft will be in a transient state outside this envelope. Naturally one can draw such a shape for any chosen g-number and it is a step in the process of calculation of an instantaneous and a sustained rate of turn, as an example.